International Journal of Insect Morphology and Embryology最新文献_第8页

Host body size as a factor determining the egg complement of Strepsiptera, an insect parasite 寄主体型是决定链翅目昆虫虫卵补体的一个因素

International Journal of Insect Morphology and Embryology Pub Date : 1998-01-01 DOI: 10.1016/S0020-7322(97)00033-0

Yasuo Maeta , Kimitaka Takahashi , Norihide Shimada

{"title":"Host body size as a factor determining the egg complement of Strepsiptera, an insect parasite","authors":"Yasuo Maeta , Kimitaka Takahashi , Norihide Shimada","doi":"10.1016/S0020-7322(97)00033-0","DOIUrl":"10.1016/S0020-7322(97)00033-0","url":null,"abstract":"<div><p>The egg complement (total number of eggs produced by a single female) differs greatly among the species of Strepsiptera. The maximum is found in <em>Stichotrema dallatorreanum</em> (750,000 eggs), and the minimum in <em>Triozocera minor</em> (984 eggs). Based on the egg complement of 31 species in 11 genera, the following conclusions were drawn: (1) The egg complement is generally smaller in those species whose hosts gregariously cohabit in a very limited area, or are distinct flower-visitors, compared with those whose hosts display the above two traits weakly; (2) The egg complement is determined by the size of the maternal body. The size of female strepsipterans is reduced when they parasitize smaller host such as males and workers, as compared with those that parasitize larger host such as females and queens; likewise, the size of the strepsipterans becomes larger on increase in size of hosts, showing that their egg complements are principally determined by the size of host species; (3) The increase in the egg complement is compensated for by the reduction in egg size. The relative egg size (length of the firstinstar larva/length of maternal body) is conspicuously reduced according to an increase in the size of the female strepsipterans.</p></div>","PeriodicalId":100701,"journal":{"name":"International Journal of Insect Morphology and Embryology","volume":"27 1","pages":"Pages 27-37"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0020-7322(97)00033-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74103182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Developmental stages of Caenocholax fenyesi Pierce (Strepsiptera : Myrmecolacidae): Descriptions and significance to the higher taxonomy of Strepsiptera fenyesi Pierce Caenocholax fenyesi Pierce的发育阶段(链翅目:金蝇科):描述及其对链翅目高级分类的意义

International Journal of Insect Morphology and Embryology Pub Date : 1998-01-01 DOI: 10.1016/S0020-7322(97)00030-5

Jerry L. Cook, S.Bradleigh Vinson, Roger E. Gold

引用次数: 11

Testis morphology and spermatogenesis in two species of Elenchus (Strepsiptera : Elenchidae) 两种叶猴睾丸形态及精子发生(链翅目:叶猴科)

International Journal of Insect Morphology and Embryology Pub Date : 1998-01-01 DOI: 10.1016/S0020-7322(97)00029-9

Marcella Carcupino , Jeyaraney Kathirithamby , Massimo Mazzini

{"title":"Testis morphology and spermatogenesis in two species of Elenchus (Strepsiptera : Elenchidae)","authors":"Marcella Carcupino , Jeyaraney Kathirithamby , Massimo Mazzini","doi":"10.1016/S0020-7322(97)00029-9","DOIUrl":"10.1016/S0020-7322(97)00029-9","url":null,"abstract":"<div><p>Testes ultrastructure and spermatogenesis were studied in two species of Strepsiptera (Insecta), namely, <em>Elenchus tenuicornis</em> and <em>E. japonicus</em>, using light and electron microscopy. In both species, the testis is paired and consists of several large irregularly shaped follicles. Each follicle consists of a single clone of germ cells surrounded by a thin epithelium. During the larval and pupal stages, all the germ cells of each testis develop synchronously, and at eclosion, the gonads contain solely mature sperm. One of the most interesting findings is the morphogenesis of a large nuclear vesicle bounded by the fenestrate part of the nuclear envelope. This vesicle contains an electron-dense spherical structure, the chromatoid body. At the end of spermiogenesis, both the nuclear vesicle and its chromatoid body are eliminated with the excess cytoplasm. Large drops of residual cytoplasm containing several nuclear vesicles are present in the lumen of the testis and inside the cytoplasm of phagocytic cells.</p></div>","PeriodicalId":100701,"journal":{"name":"International Journal of Insect Morphology and Embryology","volume":"27 1","pages":"Pages 9-19"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0020-7322(97)00029-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84557940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Reductions and new inventions dominate oogenesis of Strepsiptera (Insecta) 链翅目(昆虫亚目)卵发生主要是减少和新发明

International Journal of Insect Morphology and Embryology Pub Date : 1998-01-01 DOI: 10.1016/S0020-7322(97)00028-7

Jürgen Büning

{"title":"Reductions and new inventions dominate oogenesis of Strepsiptera (Insecta)","authors":"Jürgen Büning","doi":"10.1016/S0020-7322(97)00028-7","DOIUrl":"10.1016/S0020-7322(97)00028-7","url":null,"abstract":"<div><p>The endoparasitic life of strepsipterans (Insecta), especially neotenic females, reduces to a great extent external and internal organs. Light and electron microscopic investigation of ovaries of <em>Elenchus tenuicornis</em> (Kirby) confirms the following: (1) somatic tissues of ovaries are totally reduced, with the exception of some cells surrounding germ cell clusters; (2) a previtellogenic growth phase of oocytes is reduced; (3) nurse cells remain diploid and their membranes degenerate at the onset of vitellogenesis; (4) vitellogenesis is reduced, vitellin and fat vacuoles contribute only 50% to the final egg volume; and (5) chorionogenesis is reduced to a vitellin membrane. However, some features of normal development remain, allowing classification of the ovary type as polytrophic meroistic: (1) germ cells undergo synchronized, incomplete divisions, following the 2<sup>n</sup> rule, where all former intercellular bridges become localized in one cystocyte, while the other has none; and (2) only one cell is determined as the oocyte, all other cystocytes serve as nurse cells and the surrounding somatic cells transform into follicular cells. Novel events in oogenesis of strepsipterans include fission of clusters during the phase of cluster mitoses, and protection of oocyte nuclei, while nurse cell nuclei degenerate in the same cytoplasm.</p></div>","PeriodicalId":100701,"journal":{"name":"International Journal of Insect Morphology and Embryology","volume":"27 1","pages":"Pages 3-8"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0020-7322(97)00028-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73515895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Host-parasitoid associations of Strepsiptera: Anatomical and developmental consequences 链翅目寄主-寄生性关联:解剖学和发育的结果

International Journal of Insect Morphology and Embryology Pub Date : 1998-01-01 DOI: 10.1016/S0020-7322(97)00031-7

Jeyaraney Kathirithamby

引用次数: 18

Introductory remarks 引言

International Journal of Insect Morphology and Embryology Pub Date : 1998-01-01 DOI: 10.1016/S0020-7322(97)00027-5

Jeyaraney Kathirithamby

引用次数: 0

Phylogenetic position of the Strepsiptera: Review of molecular and morphological evidence 链翅目的系统发育地位:分子和形态学证据综述

International Journal of Insect Morphology and Embryology Pub Date : 1998-01-01 DOI: 10.1016/S0020-7322(97)00032-9

Michael F. Whiting

引用次数: 30

Olfactory sensilla in crustaceans: Morphology, sexual dimorphism, and distribution patterns 甲壳类动物的嗅觉感受器:形态、两性二态性和分布模式

International Journal of Insect Morphology and Embryology Pub Date : 1997-07-01 DOI: 10.1016/S0020-7322(97)00019-6

Eric Hallberg, Kjell U.I. Johansson, Rita Wallén

引用次数: 79

Pore structures in insect olfactory sensilla: A review of data and concepts 昆虫嗅觉感受器的孔结构:资料和概念综述

International Journal of Insect Morphology and Embryology Pub Date : 1997-07-01 DOI: 10.1016/S0020-7322(97)00024-X

Rudolf Alexander Steinbrecht

{"title":"Pore structures in insect olfactory sensilla: A review of data and concepts","authors":"Rudolf Alexander Steinbrecht","doi":"10.1016/S0020-7322(97)00024-X","DOIUrl":"10.1016/S0020-7322(97)00024-X","url":null,"abstract":"<div><p>An historical overview is given of the most important discoveries and hypotheses regarding stimulus transport in insect olfaction. The great structural similarity between the pore tubules of olfactory single-walled wall-pore sensilla and the epicuticular filaments of non-olfactory cuticle may reflect not only a similar composition but also a similar transport mechanism. The new “wick concept” of pore tubules comprises 2 developmental periods. First, during ontogeny of the sensillum, pore tubules may be involved in the secretion of the material of the outermost epicuticular layers. The pore tubules may function like the wick in an oil lamp, taking up lipoid molecules from the sensillum lymph for outward transport. During the second period, after the sensillum has been completed, the pore-tubule wick may work as a dispenser of odorant molecules in an inward direction. The large surface of pore tubules as compared with the cross section of the outer pores could facilitate the binding of odorant molecules by the odorant-binding proteins in the sensillum lymph. In double-walled wall-pore sensilla, on the other hand, pore tubules are not involved in stimulus transport. In this class of olfactory sensilla, the dendrites are protected by a palisade of cuticular fingers, and openings between these fingers, the spoke channels, are the stimulus transport pathways. The fundamentally different topology of sensillar wall pores hints at a separate phylogenetic origin of the two categories of insect olfactory sensilla.</p></div>","PeriodicalId":100701,"journal":{"name":"International Journal of Insect Morphology and Embryology","volume":"26 3","pages":"Pages 229-245"},"PeriodicalIF":0.0,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0020-7322(97)00024-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85880321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 286

Fine structure and physiology of the infrared receptor of beetles of the genus Melanophila (Coleoptera: Buprestidae) 黑蝇属甲虫红外受体的精细结构和生理特征(鞘翅目:黑蝇科)

International Journal of Insect Morphology and Embryology Pub Date : 1997-07-01 DOI: 10.1016/S0020-7322(97)00022-6

Helmut Schmitz , Horst Bleckmann

{"title":"Fine structure and physiology of the infrared receptor of beetles of the genus Melanophila (Coleoptera: Buprestidae)","authors":"Helmut Schmitz , Horst Bleckmann","doi":"10.1016/S0020-7322(97)00022-6","DOIUrl":"10.1016/S0020-7322(97)00022-6","url":null,"abstract":"<div><p>Buprestid beetles of the genus <em>Melanophila</em> (Coleoptera: Buprestidae) possess paired thoracic pit organs. Each pit houses about 70 tightly packed infrared sensilla that enable the beetles to detect forest fires at long range. The cuticular apparatus of a single infrared sensillum consists of an endocuticular sphere with an average diameter of 15 μm. Each sphere is innervated from below by the dendritic outer segment of a single sensory neuron that shows the same ultrastructure as a typical hair mechanoreceptor (e.g., sensillum trichodeum). Several transitional stages between cuticular mechanoreceptors and infrared sensilla can be found in the neighbourhood of the infrared sensillum field (intermediate sensilla and so-called suppressed systems). First electrophysiological recordings show that the receptors at the bottom of the pit are true infrared receptors. The sensilla respond in a fast phasic manner to infrared radiation and even an exposition time of 2 ms is sufficient to release a single spike. All morphological and physiological findings suggest that the infrared sensilla have evolved from ordinary cuticular mechanoreceptors and that mechanical events are still part of the transduction process. A model about the possible function of the infrared receptors of <em>Melanophila</em> is presented.</p></div>","PeriodicalId":100701,"journal":{"name":"International Journal of Insect Morphology and Embryology","volume":"26 3","pages":"Pages 205-215"},"PeriodicalIF":0.0,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0020-7322(97)00022-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89471047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 58