Journal of Morphology最新文献_第6页

Hyperostosis in Fishes: An Update With New Species Records 鱼类骨质疏松症：新物种记录更新

IF 1.5 4区医学

Journal of Morphology Pub Date : 2024-10-18 DOI: 10.1002/jmor.21782

William F. Smith-Vaniz, Julia Klein, Harald Ahnelt

{"title":"Hyperostosis in Fishes: An Update With New Species Records","authors":"William F. Smith-Vaniz, Julia Klein, Harald Ahnelt","doi":"10.1002/jmor.21782","DOIUrl":"https://doi.org/10.1002/jmor.21782","url":null,"abstract":"Literature reports of hyperostosis are often misleading and have been confused with osteomas, a pathological condition. Hyperostotic bones are known to occur only in bony fishes of the class Actinopterygii, within at least 16 orders, 35 families, 89 genera, and 153 species. They are present almost exclusively in marine fishes and exceptionally in a few extinct freshwater species known from hypersaline environments and one extant cichlid. Hyperostosis is best represented in the family Carangidae where it is known to occur in 53 of approximately 181 valid species. We also provide a synthetic report on what we know and what misconceptions exist regarding hyperostosis. Patterns of hyperostosis are often species-specific but provide no useful phylogenetic information. In species known to develop hyperostosis, it is usually not apparent (non-histologically) in juveniles and typically only becomes fully developed in the largest individuals. The timing of hyperostosis on-set in different bones is often sequential rather than simultaneous across different bones. Most marine Neoteleostei have acellular skeletons but histological observations have shown that in species exhibiting hyperostosis, areas of active remodeling are composed primarily of cellular bone characterized by a rich vascular network and bone-resorbing osteoclasts.","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":"285 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jmor.21782","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution of Placentation in Eugongylini (Squamata: Scincidae): Ontogeny of Extraembryonic Membranes in Oviparous and Viviparous Species of New Zealand Eugongylini（有鳞目：蝎科）胎盘的进化：新西兰卵生和胎生物种胚外膜的本体发育

IF 1.5 4区医学

Journal of Morphology Pub Date : 2024-10-17 DOI: 10.1002/jmor.70001

James R. Stewart, Kelly M. Hare, Michael B. Thompson

{"title":"Evolution of Placentation in Eugongylini (Squamata: Scincidae): Ontogeny of Extraembryonic Membranes in Oviparous and Viviparous Species of New Zealand","authors":"James R. Stewart, Kelly M. Hare, Michael B. Thompson","doi":"10.1002/jmor.70001","DOIUrl":"https://doi.org/10.1002/jmor.70001","url":null,"abstract":"<div>\u0000 \u0000 New Zealand scincid lizards, genus Oligosoma, represent a monophyletic radiation of a clade, Eugongylini, of species distributed geographically throughout the South Pacific with major radiations in Australia and New Caledonia. Viviparity has evolved independently on multiple occasions within these lineages. Studies of Australian species have revealed that placental specializations resulting in substantial placentotrophy have evolved in two lineages. The pattern of extraembryonic membrane development of oviparous species differs from viviparous species and identical placental architecture has evolved in both placentotrophic lineages. We analyzed extraembryonic membrane development in two New Zealand species, the sole oviparous species, Oligosoma suteri, and placental development of a representative viviparous species, Oligosoma polychroma, using histological techniques. We conclude that these two species share a basic pattern of extraembryonic membrane development with other squamates. Comparisons with Australian species indicate that morphogenesis of the yolk sac of O. suteri results in an elaborate structure previously known only in Oligosoma lichenigerum with a geographic distribution on Lord Howe Island and Norfolk Island. This finding supports a close relationship between these two taxa. We conclude also that the pattern of placental development of O. polychroma is identical to that of viviparous species of Australia. The terminal placental stage for each of these lineages includes a chorioallantoic placenta and an elaborate omphaloplacenta. This level of homoplasy in placental evolution is consistent with a hypothesis that selection favors regional differentiation of the maternal–embryonic interface and that the omphaloplacenta is an adaptation for histotrophic transport.</div>","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":"285 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aesthete Pattern Diversity in Chiton Clades (Mollusca: Polyplacophora): Balancing Sensory Structures and Strength in Valve Architecture 甲壳纲支系（软体动物：多孔动物）的呼吸器模式多样性：平衡瓣膜结构中的感觉结构和强度

IF 1.5 4区医学

Journal of Morphology Pub Date : 2024-10-16 DOI: 10.1002/jmor.21784

Andre Ampuero, Katarzyna Vončina, Dilworth Y. Parkinson, Julia D. Sigwart

{"title":"Aesthete Pattern Diversity in Chiton Clades (Mollusca: Polyplacophora): Balancing Sensory Structures and Strength in Valve Architecture","authors":"Andre Ampuero, Katarzyna Vončina, Dilworth Y. Parkinson, Julia D. Sigwart","doi":"10.1002/jmor.21784","DOIUrl":"https://doi.org/10.1002/jmor.21784","url":null,"abstract":"Chitons possess the most elaborate system of shell pores found in any hard-shelled invertebrate. Although chitons possess some anteriorly located sense organs, they lack true cephalization, as their major sensory systems are not concentrated in a distinct head region. Instead, the aesthete system within their shells forms a dense sensory network that overcomes the barrier of their hard dorsal armour. The basic arrangement of neural structures embedded within a solid, opaque matrix, has confounded understanding of the overall network. In this study, we use synchrotron X-ray μCT to visualise the aesthete canal networks inside chiton valves. We selected representatives from all three major chiton clades: Lepidopleurida, the basal branching clade, and Callochitonida and Chitonida, which both have more complex shell morphology, to compare internal structure. Lepidopleurida aesthete canals are oriented vertically and pass directly through the shell to connect with the body. By contrast, aesthetes canals in Callochitonida and Chitonida have complex internal structures with extended horizontal passages, coalescing at the shell diagonal that corresponds to the valve insertion slits. This represents a stepwise evolution of chiton shell form, where thicker and more complex valves require a diverting and rewiring of the entire sensory network. Aspects of the aesthete system, such as the microscopic arrangement of surface pores, have long been used in chiton taxonomy for species diagnoses; insertion slits should also be understood as a secondary feature of the aesthete system. Chiton shell structures that are used for morphological systematics are driven by sensory adaptations.","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":"285 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jmor.21784","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142439074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Defensive Behavior and Integumentary Morphology of the Hairy Dwarf Porcupine Coendou spinosus (Rodentia: Erethizontidae) 多毛矮豪猪的防御行为和整体形态（啮齿目：箭猪科）

IF 1.5 4区医学

Journal of Morphology Pub Date : 2024-10-16 DOI: 10.1002/jmor.70000

Isabela Tanuri Bessa, Thais Marques Cancela, Carlos Ramón Ruiz-Miranda, Ana Lúcia Rosa do Nascimento, Jorge José de Carvalho, Gastón Andrés Fernandez Giné, Vinicius Novaes Rocha

{"title":"Defensive Behavior and Integumentary Morphology of the Hairy Dwarf Porcupine Coendou spinosus (Rodentia: Erethizontidae)","authors":"Isabela Tanuri Bessa, Thais Marques Cancela, Carlos Ramón Ruiz-Miranda, Ana Lúcia Rosa do Nascimento, Jorge José de Carvalho, Gastón Andrés Fernandez Giné, Vinicius Novaes Rocha","doi":"10.1002/jmor.70000","DOIUrl":"https://doi.org/10.1002/jmor.70000","url":null,"abstract":"<div>\u0000 \u0000 New World porcupines (Erethizontidae) exhibit behaviors and possess integumentary structures, including the quills, that are used for self-defense. The North American porcupine (Erethizon dorsatum) has been well studied regarding these features; however, information is lacking for the South American Coendou species. We describe the defensive behavior and integumentary morphology of Coendou spinosus to understand the defensive strategies of this species and to compare with those reported for other species. We assessed the behaviors related to warning, defense, and escape of eight porcupines, as well as the characteristics of their pelage and quills. Furthermore, we microscopically analyzed skin samples of a roadkill adult male specimen. Similar to E. dorsatum, C. spinosus exhibited omnidirectional quill erection, revealing an aposematic color and, with their backs toward the perceived human threat, they performed quick tail and body movements to strike the hands of the human trying to capture them by the tail. Furthermore, C. spinosus presented an integumentary structure similar to that of E. dorsatum, and mechanisms to facilitate quill release when touched, penetration, and fixation in the opponent. The most distinct warning behavior noted was the vibration of the quills, which has not been reported for Erethizon. Our study confirms that, like other erethizontids, C. spinosus does not attack but exhibits warning, defense, and escape mechanisms and behaviors when threatened or touched. The dissemination of such information helps to counter the negative stigma associated with porcupines, as they can be the victims of attacks by dogs and humans, and to promote their conservation.</div>","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":"285 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142439073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extraembryonic Membranes and Placentation in the Mexican Snake Conopsis lineata 墨西哥蛇 Conopsis lineata 的胚外膜和胎盘。

IF 1.5 4区医学

Journal of Morphology Pub Date : 2024-10-10 DOI: 10.1002/jmor.21783

Cecilia de Dios-Arcos, Maricela Villagrán-SantaCruz

{"title":"Extraembryonic Membranes and Placentation in the Mexican Snake Conopsis lineata","authors":"Cecilia de Dios-Arcos, Maricela Villagrán-SantaCruz","doi":"10.1002/jmor.21783","DOIUrl":"10.1002/jmor.21783","url":null,"abstract":"Extraembryonic membranes provide protection, oxygen, water, and nutrients to developing embryos, and their study generates information on the origin of the terrestrial egg and the evolution of viviparity. In this research, the morphology of the extraembryonic membranes and the types of placentation in the viviparous snake Conopsis lineata are described through optical microscopy during early and late gestation. When embryos develop inside the uterus, they become surrounded by a thin eggshell membrane. In early gestation, during stages 16 and 18, the embryo is already surrounded by the amnion and the chorion, and in a small region by the chorioallantois, which is product of the contact between the chorion and the growing allantois. A trilaminar omphalopleure covers the yolk sac from the embryonic hemisphere to the level of the equator where the sinus terminalis is located, and from there a bilaminar omphalopleure extends into the abembryonic hemisphere. Thus, according to the relationship of these membranes with the uterine wall, the chorioplacenta, the choriovitelline placenta, and the chorioallantoic placenta are structured at the embryonic pole, while the omphaloplacenta is formed at the abembryonic pole. During late gestation (stages 35, 36, and 37), the uterus and allantois are highly vascularized. The allantois occupies most of the extraembryonic coelom and at the abembryonic pole, it contacts the omphaloplacenta and form the omphalallantoic placenta. This is the first description of all known placenta types in Squamata for a snake species member of the subfamily Colubrinae; where an eggshell membrane with 2.9 μm in width present throughout development is also evident. The structure of extraembryonic membranes in C. lineata is similar to that of other oviparous and viviparous squamate species. The above indicates not only homology, but also that the functional characteristics have been maintained throughout the evolution of the reproductive type.","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":"285 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jmor.21783","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142400442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sexual Dimorphism and Divergent Evolutionary Pathways in Primate Cranial Biomechanics: Insights From a Theoretical Morphology Framework 灵长类颅骨生物力学中的性别二形性和不同进化途径：理论形态学框架的启示》。

IF 1.5 4区医学

Journal of Morphology Pub Date : 2024-10-09 DOI: 10.1002/jmor.21780

Z. Jack Tseng, Claire E. Terhune

{"title":"Sexual Dimorphism and Divergent Evolutionary Pathways in Primate Cranial Biomechanics: Insights From a Theoretical Morphology Framework","authors":"Z. Jack Tseng, Claire E. Terhune","doi":"10.1002/jmor.21780","DOIUrl":"10.1002/jmor.21780","url":null,"abstract":"The mammalian order Primates is known for widespread sexual dimorphism in size and phenotype. Despite repeated speculation that primate sexual size dimorphism either facilitates or is in part driven by functional differences in how males and females interact with their environments, few studies have directly assessed the influence of sexual dimorphism on performance traits. Here, we use a theoretical morphology framework to show that sexual dimorphism in primate crania is associated with divergent biomechanical performance traits. The degree of dimorphism is a significant covariate in biomechanical trait divergence between sexes. Males exhibit less efficient but stiffer cranial shapes and significant evolutionary allometry in biomechanical performance, whereas females maintain performance stability across their size spectrum. Evolutionary rates are elevated for efficiency in females whereas males emphasize size-dependent cranial stiffness. These findings support a hypothesis of sex-linked bifurcation in masticatory system performance: larger male crania and faster size evolution partially compensate for low efficiency and reflect a de-emphasis of mechanical leverage, whereas female crania maintain higher mechanical efficiency overall and evolve more rapidly in molar-based masticatory performance. The evolutionary checks-and-balances between size dimorphism and cranial mechanical performance may be a more important driver of primate phenotypic evolution than has been hitherto appreciated.","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":"285 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jmor.21780","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142391211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Secretory Cells in Halla parthenopeia (Oenonidae): Potential Implications for the Feeding and Defence Strategies of a Carnivorous Burrowing Polychaete Halla parthenopeia (Oenonidae) 的分泌细胞：肉食性穴居多毛目环节动物的摄食和防御策略的潜在含义。

IF 1.5 4区医学

Journal of Morphology Pub Date : 2024-10-09 DOI: 10.1002/jmor.21781

Anita Ferri, Pedro M. Costa, Roberto Simonini

{"title":"Secretory Cells in Halla parthenopeia (Oenonidae): Potential Implications for the Feeding and Defence Strategies of a Carnivorous Burrowing Polychaete","authors":"Anita Ferri, Pedro M. Costa, Roberto Simonini","doi":"10.1002/jmor.21781","DOIUrl":"10.1002/jmor.21781","url":null,"abstract":"Carnivorous polychaetes are known to bear diversified and often unique anatomical and behavioural adaptations for predation and defence. Halla parthenopeia, a species known to be a specialized predator of clams, thrives in the soft bottoms of the Mediterranean Sea, holding potential for polyculture and biotechnology due to the secretion of bioactive compounds. Our objective was to provide a comprehensive description of H. parthenopeia's anatomy and microanatomy, shedding light on the relation between morphology and habitat, chemical defences, and feeding behaviour. The pharynx, housing maxillae and mandibles connected to an extensive mucus gland, occupies a considerable portion of the worm's length, reaching beyond the oesophagus. This unique gland is responsible for secreting the feeding mucus, which immobilizes and aids in the digestion of clams probably acting as a vehicle of bioactive compounds synthesized by specialized serous cells in the mouth. Moreover, H. parthenopeia combines behavioural tactics, such as burrowing, and anatomical defences to evade predators. Examination of its epidermis revealed a thick cuticle layer and abundant mucocytes secreting locomotion mucus, both of which save the worm from mechanical harm during movement. When it is preyed upon, the worm can release a substantial amount of Hallachrome, a toxic anthraquinone produced by specific cells in its distal region. This pigment, with its known antimicrobial properties, likely acts as a chemical shield in case of injury. The results suggest that the ability of H. parthenopeia to prey on bivalves and to provide mechanical protection plus defence against pathogens rely on its ability to secrete distinct types of mucus. The interplay between highly specialized microanatomical features and complex behaviours underscores its adaptation as a predator in marine benthic environments.","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":"285 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jmor.21781","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142391210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Osteology of the Small-Sized Hyphessobrycon piabinhas Fowler 1941 (Characiformes, Characidae) With a Discussion on Developmentally Truncated Characters in the Family Fowler 1941 年《小体型 Hyphessobrycon piabinhas 的骨骼学与对该科发育截断特征的讨论》（Characiformes, Characidae）。

IF 1.5 4区医学

Journal of Morphology Pub Date : 2024-09-23 DOI: 10.1002/jmor.21778

Manoela Maria Ferreira Marinho, Yasmim De Santana Santos, José Igor Da Silva

{"title":"Osteology of the Small-Sized Hyphessobrycon piabinhas Fowler 1941 (Characiformes, Characidae) With a Discussion on Developmentally Truncated Characters in the Family","authors":"Manoela Maria Ferreira Marinho, Yasmim De Santana Santos, José Igor Da Silva","doi":"10.1002/jmor.21778","DOIUrl":"10.1002/jmor.21778","url":null,"abstract":"<div>\u0000 \u0000 Evolutionary body size decrease has profound consequences for the morphology of an organism. In the evolution of the Characidae, the most species-rich family of Neotropical fishes, a prominent trend is the reduction of body size. The most typical effect is the simplification and reduction of morphological features through terminal deletion processes, resulting in the loss of skeletal elements and structures. To provide further information on the matter, we present a detailed description of the skeleton of Hyphessobrycon piabinhas, a poorly known, small representative of the largest genus of Characidae. We further discuss the identity and phylogenetic relationships of H. piabinhas. It belongs to the subfamily Stethaprioninae and exhibits considerable morphological similarity to other congeners from neighboring drainage systems. We identify several morphological simplifications in H. piabinhas and discuss them based on ontogenetic data available for Characiformes. These developmentally truncated elements are also present in many other small representatives of the family and seem to be among the first morphological modifications to occur in the context of body size reduction of Characidae. We argue that structural losses are not strictly correlated with sizes below 26 mm SL, although the most notable simplifications are typically observed in the miniatures.</div>","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":"285 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142289469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Precaudal Vertebrae in the Postcranial Region of Moray Eels Form Ventral Processes 海鳗颅后部的前胸椎骨形成腹面突起

IF 1.5 4区医学

Journal of Morphology Pub Date : 2024-09-15 DOI: 10.1002/jmor.21776

Yuu Usui, Naoki Yamane, Akira Hanashima, Ken Hashimoto, Yuji Kanaoka, Satoshi Mohri

{"title":"Precaudal Vertebrae in the Postcranial Region of Moray Eels Form Ventral Processes","authors":"Yuu Usui, Naoki Yamane, Akira Hanashima, Ken Hashimoto, Yuji Kanaoka, Satoshi Mohri","doi":"10.1002/jmor.21776","DOIUrl":"https://doi.org/10.1002/jmor.21776","url":null,"abstract":"Fish vertebrae are primarily morphologically classified into precaudal vertebrae jointed to the ribs and caudal vertebrae with hemal spines, through which the caudal artery and veins pass. Moray eels (family Muraenidae) capture prey by directly biting, combining oral and pharyngeal jaw. During feeding motions, they exhibit various head manipulations, such as neurocranial elevation, ventral flexion, and horizontal shaking, with their postcranial region acting like the neck of amniotes. However, the bone morphology supporting these movements remains unclear. In this study, the vertebral morphologies of the Kidako moray (Gymnothorax kidako), starry moray (Echidna nebulosa), pink-lipped moray (Echidna rhodochilus), tidepool snake moray (Uropterygius micropterus), and Seychelles moray (Anarchias seychellensis) were investigated using X-ray computed tomography. These five species exhibited longitudinal ventral processes in the second to approximately 12th precaudal vertebrae with canals for blood vessels, structurally similar to hemal spines. In addition, the morphology of the precaudal vertebrae in three Anguilliformes species closely related to moray eels and two Gasterosteiformes species, including a seahorse that flexes its head ventrally as a feeding motion, was compared with that of moray eels. However, no remarkable ventral processes were observed in their precaudal vertebrae in the postcranial region, suggesting that these structural features in the postcranial vertebrae were preserved in Muraenidae but not necessarily required for the fish to bend its head ventrally. Although the functional significance of the ventral process has yet to be determined, our findings highlight a novel aspect of fish vertebral morphology.","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":"285 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jmor.21776","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142234776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Ovary Structure in Terrestrial Parasitengona Mites: The Case of Trombidiidae (Acariformes: Parasitengona) 陆生寄生螨的子房结构：Trombidiidae（蛛形纲：寄生登革热螨）的情况

IF 1.5 4区医学

Journal of Morphology Pub Date : 2024-09-15 DOI: 10.1002/jmor.21774

Anna Derdak, Izabela Jędrzejowska, Joanna Mąkol

{"title":"The Ovary Structure in Terrestrial Parasitengona Mites: The Case of Trombidiidae (Acariformes: Parasitengona)","authors":"Anna Derdak, Izabela Jędrzejowska, Joanna Mąkol","doi":"10.1002/jmor.21774","DOIUrl":"https://doi.org/10.1002/jmor.21774","url":null,"abstract":"<div>\u0000 \u0000 Species of mites (Chelicerata: Arachnida) show a great variety of structures of the female gonads. In both evolutionary lines, Acariformes and Parasitiformes, the panoistic ovary, in which all germline cysts differentiate into oocytes, and the meroistic ovary, in which the oocytes grow supported by the nurse cells, have been documented. A less pronounced variation in the gonad structure could be expected at lower systematic levels, hence, we ask about the degree of differences within the family that is subordinate to Acariformes and represents the cohort Parasitengona. Based on the members of Trombidiidae (Acariformes: Trombidiformes, Parasitengona, Trombidioidea), we test the hypothesis that the general ovary type is constant at the family level. Our previous research on the female gonad in Allothrombium fuliginosum revealed that the meroistic ovary occurs in these mites. Here, we proceed with a detailed insight into the ovary structure in A. fuliginosum and examine the structure of the female gonad in other members of Trombidiidae, focusing on the following representatives of its nominotypical genus Trombidium: Trombidium brevimanum, Trombidium holosericeum, Trombidium heterotrichum, and Trombidium latum. For all species, studied with light, fluorescence, and transmission electron microscopy, we could confirm the presence of the meroistic ovary that is highly similar with respect to general architecture. The germline cysts show similarities in general morphology and the mode of germline cell differentiation; they consist of a few nurse cells and one oocyte. The connection between the nurse cells and oocytes is maintained by trophic cords that serve for the transport of organelles and macromolecules. Our results confirm the constancy of the structure of the female gonad at the intrageneric level and provide further support for the hypothesis on the lack of differences at the intrafamily level.</div>","PeriodicalId":16528,"journal":{"name":"Journal of Morphology","volume":"285 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142234775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0