Arthropod Structure & Development最新文献

Unraveling the insect head: Segmentation and pancrustacean homologous 昆虫头的解剖：分节与盘壳类同源

IF 1.7 3区农林科学

Arthropod Structure & Development Pub Date : 2025-05-31 DOI: 10.1016/j.asd.2025.101462

Patricia Nel , Michael S. Engel , Carmen Soriano , Sylvain Pont , Lauriane Jacquelin , Laurence Dollinger , Laure Desutter-Grandcolas , Tony Robillard , Romain Garrouste , Dany Azar , André Nel

{"title":"Unraveling the insect head: Segmentation and pancrustacean homologous","authors":"Patricia Nel , Michael S. Engel , Carmen Soriano , Sylvain Pont , Lauriane Jacquelin , Laurence Dollinger , Laure Desutter-Grandcolas , Tony Robillard , Romain Garrouste , Dany Azar , André Nel","doi":"10.1016/j.asd.2025.101462","DOIUrl":"10.1016/j.asd.2025.101462","url":null,"abstract":"<div><div>The segmental composition of the arthropodan head is a long-standing biological question. This is particularly controversial in insects where considerable fusion and modification obfuscate the postembryonic segmentation. Here we propose a reinterpretation of the insect head morphology and segmentation, which also accords with current genetic and embryological data. The new interpretation of a generalized insect head is based on the discovery of intercalary segment remnants (the intercalates), thanks to the use of 3D-reconstruction of a Cretaceous thripidan and to a reassessment of the ‘anterior tentorial arm’ as the anteriormost part of a lateral segmental suture from the contact of the head lobe and gnathal segments during development. We show that the two-jointed mandibular articulation is likely symplesiomorphic for Insecta, no longer supporting the clade ‘Dicondylia’, the most diverse lineage of all insects. We discuss new perspectives on the ‘labrum’ in Pancrustacea.</div></div>","PeriodicalId":55461,"journal":{"name":"Arthropod Structure & Development","volume":"87 ","pages":"Article 101462"},"PeriodicalIF":1.7,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A “bioluminescent” common cockchafer? 一种“生物发光”的普通鸡冠？

IF 1.7 3区农林科学

Arthropod Structure & Development Pub Date : 2025-05-21 DOI: 10.1016/j.asd.2025.101451

Marcel Koken , Valérie Galin , Tim Koken , Harry Buckle , Fabien Verfaillie

引用次数: 0

3D is not just a tool - a study of the anal capsule in Craterostigmus tasmanianus Pocock (1902) (Chilopoda, Arthropoda) 三维技术不仅仅是一个工具——对1902年塔斯马那雄鼠肛门囊的研究（足足纲，节肢纲）

IF 1.7 3区农林科学

Arthropod Structure & Development Pub Date : 2025-05-07 DOI: 10.1016/j.asd.2025.101450

Birk Rillich, Christian S. Wirkner

{"title":"3D is not just a tool - a study of the anal capsule in Craterostigmus tasmanianus Pocock (1902) (Chilopoda, Arthropoda)","authors":"Birk Rillich, Christian S. Wirkner","doi":"10.1016/j.asd.2025.101450","DOIUrl":"10.1016/j.asd.2025.101450","url":null,"abstract":"<div><div><em>Craterostigmus tasmanianus</em> Pocock, 1902, is a chilopod distinguished, among other features, by a unique structure known as the anal capsule. Morphological questions regarding the anal capsule pertain to the homology of its functional components when compared to other chilopods, as well as the morpho-functional mechanisms involved in its opening and closing. Additionally, there has been ongoing debate about the precise location of the anus on the anal capsule. Some studies have suggested that the anus is located at the posterior end of the capsule, while others have proposed a position in the middle of the ventral side of the capsule.</div><div>To address these questions, μCT and cLSM scans were conducted on the anal capsule of <em>C. tasmanianus</em> and the posterior segments of <em>Scutigera coleoptrata</em> (Linnaeus, 1758). The resulting data were processed using 3D visualization software. Different muscle groups were identified, and the cuticle was analyzed to determine the presence of resilin, a highly elastic component in arthropod cuticles.</div><div>Based on the findings, hypotheses were formulated regarding the morpho-functional mechanisms of movement and the homology of the anal capsule structures in <em>C. tasmanianus</em> and <em>S. coleoptrata</em>. The analysis also resolved the question of anus location, confirming that it is situated at the posterior end of the anal capsule.</div></div>","PeriodicalId":55461,"journal":{"name":"Arthropod Structure & Development","volume":"87 ","pages":"Article 101450"},"PeriodicalIF":1.7,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143917464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

That's how they roll: skeletal mechanics of enrolment and the importance of hydrostatic support in terrestrial isopods 这就是它们的滚动方式：骨骼力学的注册和陆地等足类动物的流体静力支撑的重要性

IF 1.7 3区农林科学

Arthropod Structure & Development Pub Date : 2025-05-02 DOI: 10.1016/j.asd.2025.101452

Miloš Vittori

{"title":"That's how they roll: skeletal mechanics of enrolment and the importance of hydrostatic support in terrestrial isopods","authors":"Miloš Vittori","doi":"10.1016/j.asd.2025.101452","DOIUrl":"10.1016/j.asd.2025.101452","url":null,"abstract":"<div><div>Various arthropods can roll into a ball for protection. In terrestrial isopods (Oniscidea), this ability has likely evolved independently in different lineages. In this work, comparative imaging of extended and rolled isopods using micro-computed tomography of rapidly frozen individuals was coupled with live imaging. The results show that the points of rotation between consecutive body segments are positioned dorsolaterally and do not represent fixed joints, as previously assumed. Ridges at the anterior and posterior edges of consecutive dorsal plates (tergites) lean against each other at these points, allowing consecutive body segments to rotate relative to each other. Conglobating terrestrial isopods have shorter sternal plates than non-rollers. As a result, the sternal plates overlap only as an isopod rolls, forming furrows that accommodate the walking legs. The sternal plates are able to bend along a flexible suture at their midline, which is pulled inward during rolling. Both conglobating and non-conglobating terrestrial isopods are capable not only of ventral but also lateral flexion, which requires the separation of the surfaces that are in contact during rolling. The observed diversity of movements can be explained by the use of hydrostatic support provided by the hemocoel. The essential role of this hydrostatic support in the movement of isopods is demonstrated.</div></div>","PeriodicalId":55461,"journal":{"name":"Arthropod Structure & Development","volume":"87 ","pages":"Article 101452"},"PeriodicalIF":1.7,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Novel information on Caryosyntrips based on new appendages from China and the USA 基于中国和美国新附属物的核合体新资料

IF 1.7 3区农林科学

Arthropod Structure & Development Pub Date : 2025-04-30 DOI: 10.1016/j.asd.2025.101448

Xianfeng Yang , Julien Kimmig , Stephen Pates , Paul G. Jamison , Shuhan Ma

{"title":"Novel information on Caryosyntrips based on new appendages from China and the USA","authors":"Xianfeng Yang , Julien Kimmig , Stephen Pates , Paul G. Jamison , Shuhan Ma","doi":"10.1016/j.asd.2025.101448","DOIUrl":"10.1016/j.asd.2025.101448","url":null,"abstract":"<div><div><em>Caryosyntrips</em> is a relatively rare but long-lived and geographically widespread radiodont genus with specimens reported from Cambrian Stage 4 to the Drumian of Gondwana and Laurentia. Most of the currently known specimens are from the Wulian to Drumian deposits of North America and only one specimen is known from Stage 4 of Gondwana. Here, two new specimens are reported. The first one is a <em>C.</em> cf. <em>Caryosyntrips serratus</em> appendage from the Malong Biota of China (Cambrian, Series 2, Stage 3), which also represents the first reported occurrence of <em>Caryosyntrips</em> from China. The second appendage is from the Spence Shale Member (Cambrian, Miaolingian, Wuliuan) of Utah, USA and shares characters with both <em>Caryosyntrips camurus</em> and <em>Caryosyntrips durus</em>. This new specimen indicates that characters previously used to diagnose species might instead reflect intraspecific variation, however confirmation of this depends on discovery of new material. These new finds increase the temporal range of the genus into Cambrian Stage 3 and the specimen from the Malong Biota significantly increases the geographical range of the genus, with its first occurrence in China. In addition to the description of the new material we also discuss the function of the appendages in <em>Caryosyntrips</em> and the ecology of the genus.</div></div>","PeriodicalId":55461,"journal":{"name":"Arthropod Structure & Development","volume":"87 ","pages":"Article 101448"},"PeriodicalIF":1.7,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution and homology of leg segments in Chelicerata: Evo-devo solutions to century-old challenges Chelicerata腿节的进化和同源性：进化-进化解决百年挑战

IF 1.7 3区农林科学

Arthropod Structure & Development Pub Date : 2025-04-30 DOI: 10.1016/j.asd.2025.101446

Benjamin C. Klementz , Georg Brenneis , Ethan M. Laumer , Sophie M. Neu , Mark S. Harvey , Prashant P. Sharma

{"title":"Evolution and homology of leg segments in Chelicerata: Evo-devo solutions to century-old challenges","authors":"Benjamin C. Klementz , Georg Brenneis , Ethan M. Laumer , Sophie M. Neu , Mark S. Harvey , Prashant P. Sharma","doi":"10.1016/j.asd.2025.101446","DOIUrl":"10.1016/j.asd.2025.101446","url":null,"abstract":"<div><div>A major theme in the evolution of Arthropoda is the origin and diversification of jointed appendages. One appealing framework for the evolution of arthropod appendage diversity has long been that a small network of homologous genes in the panarthropod ancestor established and subdivided the proximo-distal (PD) appendage axis, with lineage-specific modifications of these genes’ expression domains resulting in novel types of appendages. A corollary of this idea is the inference that each segment in the arthropod leg can be directly homologized to other such segments, based on anatomical or developmental genetic landmarks. Here, we explore the evolution of leg segments in Chelicerata, a group which exhibits marked diversity in leg architecture and number of leg segments, and thereby poses a greater challenge to the exercise of assigning segmental homologies. Focusing on the controversial nomenclature of leg segments in Pycnogonida (sea spiders), we identify potential markers of positional homology in different parts of the sea spider and arachnid PD axis, using comparative gene expression data. Nevertheless, we identify caveats to the use of transcription factor expression domains as landmarks for inference of positional homology, highlighting cases where datasets conflict in homology assignment. We postulate that the utility of gene expression data for inferring homologies is a function of phylogenetic distance.</div></div>","PeriodicalId":55461,"journal":{"name":"Arthropod Structure & Development","volume":"87 ","pages":"Article 101446"},"PeriodicalIF":1.7,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sexual dimorphism and ultrastructure of salivary glands in adult Bittacus cirratus Tjeder, 1956 (Mecoptera: Bittacidae) 猕猴桃成虫唾液腺的两性异形及超微结构（鞘翅目：猕猴桃科）

IF 1.7 3区农林科学

Arthropod Structure & Development Pub Date : 2025-04-11 DOI: 10.1016/j.asd.2025.101441

He-Hong Wang, Le-Le He, Jie Zhang, Bao-Zhen Hua

{"title":"Sexual dimorphism and ultrastructure of salivary glands in adult Bittacus cirratus Tjeder, 1956 (Mecoptera: Bittacidae)","authors":"He-Hong Wang, Le-Le He, Jie Zhang, Bao-Zhen Hua","doi":"10.1016/j.asd.2025.101441","DOIUrl":"10.1016/j.asd.2025.101441","url":null,"abstract":"<div><div>Sexual dimorphism is ubiquitous in insects and has been extensively studied across various taxa. However, it remains unclear whether the salivary glands exhibit sexual dimorphism in adult Bittacidae. In this study, a comparative study of salivary glands in adult male and female <em>Bittacus cirratus</em> Tjeder, 1956 was performed using light and transmission electron microscopy. The salivary glands are tubular labial glands in both sexes of <em>B. cirratus</em>, consisting of a salivary pump, a common salivary duct, a pair of efferent ducts, and numerous dichotomously branching secretory tubules. Interestingly, the salivary glands in females contain a pair of small salivary reservoirs, which are not present in the males. The male salivary glands have a significantly larger diameter and more secretory tubules than those in females. In contrast, male secretory cells occupy a minimal volume of the secretory tubule, resulting in a larger secretory lumen that nearly fills the entire tubule. This configuration enhances the storage capacity of the male secretory tubules. Male secretory cells exhibit active autophagy, possibly due to their approaching late life stages. Sexual dimorphism in the salivary glands and the possible reasons are briefly discussed in Bittacidae.</div></div>","PeriodicalId":55461,"journal":{"name":"Arthropod Structure & Development","volume":"86 ","pages":"Article 101441"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrastructural and light/dark adaptational characteristics of the compound eyes in the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae) 夜蛾（Spodoptera frugiperda）复眼超微结构及光/暗适应特征

IF 1.7 3区农林科学

Arthropod Structure & Development Pub Date : 2025-04-10 DOI: 10.1016/j.asd.2025.101449

Ying Han, Qing-Xiao Chen

{"title":"Ultrastructural and light/dark adaptational characteristics of the compound eyes in the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae)","authors":"Ying Han, Qing-Xiao Chen","doi":"10.1016/j.asd.2025.101449","DOIUrl":"10.1016/j.asd.2025.101449","url":null,"abstract":"<div><div>The fall armyworm, <em>Spodoptera frugiperda</em>, is a highly destructive agricultural pest native to the Americas, becoming a major invasive species worldwide over the past decade. In this study, the ultrastructure of the compound eyes and light/dark adaptational changes in <em>S. frugiperda</em> were investigated using light and transmission as well as scanning electron microscopy. The compound eyes of <em>S. frugiperda</em> are of the superposition type, featuring a clear zone. Each ommatidium contains eight retinula cells, seven of which extend through the clear zone to the basal lamina, while one cell is located near the basal lamina. The clear zone is longer in dark-adapted eyes than in light-adapted eyes. In dark-adapted eyes, the rhabdoms extend through the clear zone, with their distal ends connecting to the crystalline cones. In light-adapted eyes, however, the rhabdoms do not reach the distal region of the clear zone but are instead confined to the proximal level of the clear zone. Although the rhabdom occupation ratio to the retinula remains constant under both light and dark adaptation, the cross-sectional area of the rhabdoms and their associated retinulae is significantly larger under dark adaptation. These ultrastructural and adaptational characteristics were discussed in the context of the moth's activity preferences, particularly its nocturnal behavior.</div></div>","PeriodicalId":55461,"journal":{"name":"Arthropod Structure & Development","volume":"86 ","pages":"Article 101449"},"PeriodicalIF":1.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Copulatory mechanics in ghost spiders (Amaurobioidinae, Anyphaenidae) reveals an independent regressive evolution of a key genital trait through functional replacement 鬼蜘蛛（Amaurobioidinae, Anyphaenidae）的交配机制揭示了一种通过功能替代实现的关键生殖器特征的独立回归进化

IF 1.7 3区农林科学

Arthropod Structure & Development Pub Date : 2025-04-08 DOI: 10.1016/j.asd.2025.101442

Dante Poy , Luis N. Piacentini , Peter Michalik , Shou-Wang Lin , Leonel A. Martínez , Martín J. Ramírez

{"title":"Copulatory mechanics in ghost spiders (Amaurobioidinae, Anyphaenidae) reveals an independent regressive evolution of a key genital trait through functional replacement","authors":"Dante Poy , Luis N. Piacentini , Peter Michalik , Shou-Wang Lin , Leonel A. Martínez , Martín J. Ramírez","doi":"10.1016/j.asd.2025.101442","DOIUrl":"10.1016/j.asd.2025.101442","url":null,"abstract":"<div><div>During evolution, the morphology of animal organs can vary drastically, such as the reduction or loss of structures. This phenomenon is recurrent in the male copulatory organs of many spiders, where structures that are usually well-developed, are missing or vestigial in some taxa. One example is the retrolateral tibial apophysis (RTA) of the male pedipalp of the most diverse lineage of spiders, the RTA clade. It frequently performs a key function during genital coupling, which is the first and main mechanical engagement during genital coupling (i.e., primary locking). However, in several lineages the RTA is either lost or reduced, raising questions on how genital coupling is achieved in these taxa, and what are the potential drivers for the regression of the RTA. To address these questions, we used the subfamily Amaurobioidinae (Anyphaenidae) as a model and studied the genital mechanics of nine species with different degrees of RTA size. Genital coupling was reconstructed using microcomputed tomography (micro-CT) data of cryofixed mating pairs, revealing that, except for a species with a prominent RTA, primary locking is solely achieved by inserting the conductor (a male genital sclerite) into one of the female copulatory openings. Our phylogenetic analyses indicate that the RTA has been independently lost or reduced six times in Amaurobioidinae, and that at least one functional replacement of the RTA by the conductor has occurred within the subfamily. We hypothesize that the use of the conductor for primary locking replaced the primary function of the RTA, allowing its repeated regressions.</div></div>","PeriodicalId":55461,"journal":{"name":"Arthropod Structure & Development","volume":"86 ","pages":"Article 101442"},"PeriodicalIF":1.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143790927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The cuticle of Agnostina (basal Euarthropoda) was three-layered 底真节肢动物Agnostina的角质层为三层

IF 1.7 3区农林科学

Arthropod Structure & Development Pub Date : 2025-04-05 DOI: 10.1016/j.asd.2025.101447

Elena B. Naimark , Stanislav Yu Chaika

引用次数: 0