Abstract：
:Regional variation in the vertebral column of several species of salamanders (families Ambystomatidae, Salamandridae and Plethodontidae) is analyzed. Measurements of three dimensions, centrum length, prezygapophyseal width, and transverse process length, provide the data. Ontogenetic, interspecific, intergeneric and interfamilial patterns of positional variation are diagrammed and discussed. Distinctive patterns of variation characterize the families, genera, and to a lesser extent, the species. The patterns of ambystomatid salamanders are the most generalized, and probably reflect derivation from a primitive ancestral stock. The most specialized conditions occur in the fully terrestrial plethodontids, a group generally considered to be highly derived. Data such as those presented here will aid in the identification of fossils. The patterns described have functional significance. For example, species which have an aquatic larval stage and which return to aquatic breeding sites have vertebrae which taper in length and width behind the pelvis. This is a feature associated with production of a traveling wave in the tail which is necessary for propulsion in water. Fully terrestrial species do not have a tapering column. In them, standing waves, such as occur in the trunk region of all species, typically occur in the tail. The caudal vertebrae of terrestrial species are rather uniform in dimensions for some distance, and the tail is cylindrical in form. Other functionally important features include the narrowing and shortening of some anterior vertebrae, associated with the development of a neck in some species with tongue feeding mechanisms. In contrast, species which use their heads as wedges during locomotion have broadened anterior vertebrae which serve as sites of origin for hypertrophied neck muscles.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Worthington RD,Wake DBdoi
10.1002/jmor.1051370302subject
Has Abstractpub_date
1972-07-01 00:00:00pages
257-277issue
3eissn
0362-2525issn
1097-4687journal_volume
137pub_type
杂志文章abstract：:As part of an effort to characterize reproductive modifications in internally inseminating catfishes, ovaries and male reproductive systems were examined histologically in two species of auchenipterid catfishes, Trachelyopterus lucenai and T. galeatus, from southeastern Brazil. Internal insemination was documented in ...
journal_title：Journal of morphology
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更新日期：2000-11-01 00:00:00
abstract：:The locomotory system of Solifugae is distinct from that of other Arachnida in several ways. Only three pairs of legs are involved in locomotion, while the first pair function as sensory appendages. Morphologically, the proximal region of the locomotory system in Solifugae is characterized by fused coxae. Within the p...
journal_title：Journal of morphology
pub_type： 杂志文章
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journal_title：Journal of morphology
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doi：10.1002/jmor.1052040311
更新日期：1990-06-01 00:00:00
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journal_title：Journal of morphology
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更新日期：1987-07-01 00:00:00
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journal_title：Journal of morphology
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更新日期：2017-02-01 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：1985-01-01 00:00:00
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journal_title：Journal of morphology
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doi：10.1002/jmor.10990
更新日期：2011-11-01 00:00:00
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journal_title：Journal of morphology
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更新日期：1979-03-01 00:00:00
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更新日期：2016-09-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(199807)237:1<33::AID-JMOR3
更新日期：1998-07-01 00:00:00
abstract：:Whole body studies of Plotosus tandanus revealed that ampullary pores occur over the entire body of the fish, but are in higher concentrations in the head region. These pores give rise to a short canal (50-60 microm) produced by columnar epithelial cells bound together by tight junctions and desmosomes. At the junctio...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10063
更新日期：2003-02-01 00:00:00
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journal_title：Journal of morphology
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更新日期：2009-05-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：2017-06-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051990104
更新日期：1989-01-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20856
更新日期：2018-09-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20135
更新日期：2013-06-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052160102
更新日期：1993-04-01 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：1980-02-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：2009-01-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(199811)238:2<179::AID-JMOR
更新日期：1998-11-01 00:00:00
abstract：:Mengenillidae is a small, basal family of Strepsiptera, mainly characterized by free-living females in contrast to the endoparasitic females of Stylopidia. Here, we describe external and internal structures of the female abdomen of Eoxenos laboulbenei (Mengenillidae). The external morphology was examined and documente...
journal_title：Journal of morphology
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更新日期：2019-05-01 00:00:00
abstract：:Tardigrada, commonly called water bears, is a taxon of microscopic panarthropods with five-segmented bodies and four pairs of walking legs. Although tardigrades have been known to science for several centuries, questions remain regarding many aspects of their biology, such as embryogenesis. Herein, we used scanning el...
journal_title：Journal of morphology
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更新日期：2017-04-01 00:00:00
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journal_title：Journal of morphology
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更新日期：2000-06-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20396
更新日期：2015-09-01 00:00:00
abstract：:Salamanders possess kidneys with two distinct regions: a caudal pelvic portion and cranial genital portion. Nephrons of the pelvic region are responsible for urine formation and transport. Nephrons of the genital region transport sperm from testes to Wolffian ducts; however, nephrons of the genital region possess all ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21041
更新日期：2019-10-01 00:00:00
abstract：:Many studies in the genus Poecilia have focused on reproductive and genetic characteristics of Poecilia formosa, the Amazon molly, and its sympatric species P. latipinna and P. mexicana. The research literature of Poecilia dentition has been limited to general tooth morphology. Essentially absent are comparative analy...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(199903)239:3<271::AID-JMOR
更新日期：1999-03-01 00:00:00
