Abstract:
:Early spermatids of the onychophoran Peripatopsis capensis are spherical cells with a centrally located nucleus, numerous mitochondria, Golgi complexes, microtubules and two centrioles. During spermiogenesis, Golgi vesicles migrate to one side of the cell where they form a tight aggregate, which is later shed. The mature spermatozoon has no acrosome. Several mitochondria fuse to form a middle piece containing three large mitochondria. Nucleus and middle-piece elongate, presumably under the influence of helically twisted microtubules. Outside this set of microtubules a continuous layer of endoplasmic reticulum cisternae is formed which separates the interior portion of the cell from an external cytoplasmic rim, which is later shed. Outside the 9 + 2 complex, the tail presents nine accessory microtubules, and a peripheral layer of microtubules beneath the plasma membrane. The enforcement of the tail structure may be related to the fertilization biology of this animal, which is by "hypodermal" impregnation.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Camatini M,Franchi E,Saita Adoi
10.1002/jmor.1051590104subject
Has Abstractpub_date
1979-01-01 00:00:00pages
29-47issue
1eissn
0362-2525issn
1097-4687journal_volume
159pub_type
杂志文章abstract::Anseriform birds were surveyed to examine how the degree of postcranial pneumaticity varies in a behaviorally and size-diverse clade of living birds. This study attempts to extricate the relative effects of phylogeny, body size, and behavioral specializations (e.g., diving, soaring) that have been postulated to influe...
journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2004-08-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
pub_type: 杂志文章
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abstract::The chondrocranium is a cartilaginous structure that forms around and protects the brain and sensory organs of the head. Through ontogeny, this skeletal structure may become more elaborate, remodeled and reabsorbed, and/or ossified. Though considerable attention has been given to the formation of the chondrocranium an...
journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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更新日期:2012-08-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
pub_type: 杂志文章
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journal_title:Journal of morphology
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更新日期:2004-04-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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更新日期:2006-07-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
pub_type: 杂志文章
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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更新日期:2008-07-01 00:00:00
abstract::The objectives of this research were to investigate the morphology of the thoracic skeleton and muscles of the mosquito, Culiseta inornata (Williston). The results are presented in 25 text figures and descriptions of each skeletal part and muscle. Undescribed exoskeletal structures are the postmediotergite, intersegme...
journal_title:Journal of morphology
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更新日期:1977-09-01 00:00:00
abstract::The evolution of viviparity alters the physical relationship between mothers and offspring and the prevalence of viviparity among squamate reptiles presents an opportunity to uncover patterns in the evolution of placental structure. Understanding the breadth of this diversity is limited because studies of placental st...
journal_title:Journal of morphology
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journal_title:Journal of morphology
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abstract::The form of amniote claws has been extensively investigated, often with inferences about ecological association being drawn from studies of their geometry. Various methods have been used to quantify differences in the geometry of claws, but rarely have the underlying assumptions of such methods been addressed. Here, w...
journal_title:Journal of morphology
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更新日期:2017-02-01 00:00:00
abstract::Larval and juvenile air breathing fish may experience nocturnal and/or seasonal aquatic hypoxia. Yet, whether hypoxia induces respiratory developmental plasticity in larval air breathing fish is uncertain. This study predicted that larvae of two closely related anabantid fish-the facultative air breather the Siamese f...
journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2019-02-01 00:00:00