Abstract:
:The fine structure of the shell and underlying mantle in young juveniles of the articulate brachiopod Terebratalia transversa has been examined by electron microscopy. The first shell produced by the mantle consists of a nonhinged protegulum that lacks concentric growth lines. The protegulum is secreted within a day after larval metamorphosis and typically measures 140-150 micron long. A thin organic periostracum constitutes the outer layer of the protegulum, and finely granular shell material occurs beneath the periostracum. Protegula resist digestion in sodium hypochlorite and are refractory to sectioning, suggesting that the subperiostracal portion of the primordial shell is mineralized. The juvenile shell at 4 days postmetamorphosis possesses incomplete sockets and rudimentary teeth that consist of nonfibrous material. The secondary layer occuring in the inner part of the juvenile shell contains imbricated fibers, whereas the outer portion of the shell comprises a bipartite periostracum and an underlying primary layer of nonfibrous shell. Deposition of the periostracum takes place within a slot that is situated between the so-called lobate and vesicular cells of the outer mantle lobe. Vesicular cells deposit the basal layer of the periostracum, while lobate cells contribute materials to the overlying periostracal superstructure. Cells with numerous tonofibrils and hemidesmosomes differentiate in the outer mantle epithelium at sites of muscle attachments, and unbranched punctae that surround mantle caeca develop throughout the subperiostracal portion of the shell. Three weeks after metamorphosis, the juvenile shell averages about 320 micron in length and is similar in ultrastructure to the shells secreted by adult articulates.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Stricker SA,Reed CGdoi
10.1002/jmor.1051830303subject
Has Abstractpub_date
1985-03-01 00:00:00pages
251-71issue
3eissn
0362-2525issn
1097-4687journal_volume
183pub_type
杂志文章abstract::Vibrissae or follicle-sinus complexes (F-SCs) are highly developed mammalian sensory structures. These blood-filled sinuses are richly innervated and possess novel mechanoreceptors. Although much is known regarding the function of F-SCs in terrestrial mammals, much less is known regarding marine carnivores such as pin...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.21053
更新日期:2019-11-01 00:00:00
abstract::Based on light microscopic observations, nerve pathways are described for the first time in the praesoma of a species of the Echinorhynchidae. The pathways are described for 18 nerves, 8 paired and 2 single, which originate from the cerebral ganglion and a post-ganglionic cell and terminate in the body wall musculatur...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052010306
更新日期:1989-09-01 00:00:00
abstract::The extracellular matrices (ECMs) surrounding the benthic embryos and larvae of the seastar Patiriella exigua and the planktonic embryos of Patiriella regularis were examined by transmission and scanning electron microscopy. Three ECMs surround unhatched embryos: An outer jelly coat, a fertilization envelope, and an i...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052250107
更新日期:1995-07-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052040103
更新日期:1990-04-01 00:00:00
abstract::The Hawaiian Drosophilidae possess spectacular diversity in male foreleg modifications, many of which are unknown in other Diptera. The greatest diversity in foreleg morphology is in the antopocerus, modified tarsus, and ciliated tarsus clade (AMC Clade), a group of 95 species. The modified tarsus flies are divided in...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10783
更新日期:2010-01-01 00:00:00
abstract::The function of the septomaxilla of nonmammalian synapsids has long been problematic. Distinctive features of this bone, including a prominent intranarial process and a septomaxillary canal and foramen, are characteristic of pelycosaurs and nonmammalian therapsids, but are lost in their mammalian descendants. Numerous...
journal_title:Journal of morphology
pub_type: 杂志文章,评审
doi:10.1002/1097-4687(200007)245:1<29::AID-JMOR3>3.0.C
更新日期:2000-07-01 00:00:00
abstract::This study reports a comprehensive description of penaeid spermatogenesis (Penaeus monodon) by light and transmission electron microscopy. A conspicuous characteristic of spermatocytogenesis was a ring-like structure with high electron-density adjacent to the nucleus of a primary spermatocyte. During the spermiogenesi...
journal_title:Journal of morphology
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更新日期:2017-05-01 00:00:00
abstract::The orientation of the semicircular canals of the inner ear in the skull of vertebrates is one of the determinants of the capacity of this system to detect a given rotational movement of the head. Past functional studies on the spatial orientation of the semicircular canals essentially focused on the lateral semicircu...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20665
更新日期:2017-05-01 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
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20647
更新日期:2017-03-01 00:00:00
abstract::Changes in body morphology during growth and reproduction in the hydromedusa Eleutheria dichotoma are described in terms of variations in eight different characters: umbrella diameter, total surface area, tentacle area, umbrella area, tentacle knob diameter, number of embryos, and diameter and area of buds. Sexually (...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052000304
更新日期:1989-06-01 00:00:00
abstract::Knowledge about the diversity, locomotor adaptations, and evolution of the marsupial forelimb is limited, resulting in an underrepresentation of marsupials in comparative anatomical literature on mammalian forelimb anatomy. This study investigated hand proportions in the diverse marsupial order Diprotodontia. Fifty-tw...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10495
更新日期:2006-12-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051690305
更新日期:1981-09-01 00:00:00
abstract::Light and electron microscopic techniques show that the eye of the marine prosobranch gastropod, Ilyanassa obsoleta, is composed of an optic cavity, lens, cornea, retina, and neuropile, and is surrounded by a connective tissue capsule. The adult retina is a columnar epithelium containing three morphologically distinct...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051810207
更新日期:1984-08-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10198
更新日期:2004-04-01 00:00:00
abstract::An extremely large number of fifth ceratobranchial teeth, with highly modified, striated, and hooked tips were observed in the central and western Pacific sicydiine goby genus Stiphodon.A scanning electron microscopic study of the form and arrangement of fifth ceratobranchial teeth was conducted to assess the distribu...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199809)237:3<257::AID-JMOR
更新日期:1998-09-01 00:00:00
abstract::Intraspecific trends in freshwater mussel (unionoid) shells that are consistently associated with differences in the mussels' sex and/or parasitic infestation can potentially be used to reconstruct sex ratios or parasitic levels of modern and ancient unionoid populations. In contrast to morphological patterns within m...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10990
更新日期:2011-11-01 00:00:00
abstract::The colugos, or flying lemurs (Dermoptera), are arboreal gliding mammals that are commonly grouped with tree-shrews (Scandentia) and Primates in the superorder Euarchonta. However, little is known about the head and neck muscles of these gliding mammals. This raises difficulties for the discussion of not only the func...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10666
更新日期:2009-01-01 00:00:00
abstract::The dorsal fin is one of the most varied swimming structures in Acanthomorpha, the spiny-finned fishes. This fin can be present as a single contiguous structure supported by bony spines and soft lepidotrichia, or it may be divided into an anterior, spiny dorsal fin and a posterior, soft dorsal fin. The freshwater fish...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20744
更新日期:2017-12-01 00:00:00
abstract::Liolaemus elongatus (Liolaemidae) is a viviparous, mainly lecithotrophic species with placental structures specialized for uptake of oxygen and inorganic nutrient transport. An allantoplacenta and an omphaloplacenta are present during early embryonic stages (25-28) and there is a moderate distension of the uterine wal...
journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2008-07-01 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:2010-05-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10899
更新日期:2011-01-01 00:00:00
abstract::The posterior half of the channel catfish intestine has a similar histological organization to that of other teleost fishes. This region is organized into a muscosa, a submucosa, a double layered muscularis and a serosa. A "stratum compactum" of dense connective tissue was confirmed for the submucosa. In its histology...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051450405
更新日期:1975-04-01 00:00:00
abstract::The reproductive process in insects may be affected by several factors, among which environmental temperature is one of the most important because of the poikilothermic condition of insects. To determine the effect of suboptimal temperature on the spermiogenic process of Triatoma infestans, males were exposed to 12°C ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052160104
更新日期:1993-04-01 00:00:00
abstract::The morphology of 16 occipital spines of the xenacanthid Orthacanthus from Upper Carboniferous deposits of Robinson (Kansas, USA), Nýran (Czech Republic) and Puertollano (Spain) is described. The nonreplaced spines reveal the growth pattern of the shark. Moreover, the relationship between growth and paleoenvironmental...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199910)242:1<1::AID-JMOR2>
更新日期:1999-10-01 00:00:00
abstract::Asymmetrical monorchy, or the complete absence of one testis coupled with the presence of its bilateral counterpart, is reported for 174 species of the carabid beetle tribes Abacetini, Harpalini, and Platynini (Insecta: Coleoptera: Carabidae) based on a survey of over 820 species from throughout the family. This condi...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10319
更新日期:2005-04-01 00:00:00
abstract::The study of the arterial arches of Bipes, the only amphisbaenian with forelimbs, resolves the problem of the interpretation of the structure of the arterial arches in other forms of this group of squamate reptiles. In Bipes, as in turtles, the subclavian and common carotid arteries originate from a brachiocephalic tr...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051840202
更新日期:1985-05-01 00:00:00
abstract::Non-innervated macrotrichia and microtrichia, thick-walled chemoreceptors and three kinds of thin-walled chemoreceptors are present on the antennal flagellum of Frenesia missa. One of the thin-walled receptors, the plate organ, is of a type not previously recorded for any insect. About four times as many plate organs ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051350309
更新日期:1971-11-01 00:00:00
abstract::According to the current opinion, lymph-heart striated muscle represents a specialized type of skeletal muscles in frogs. Here, we studied muscle fibers in mechanically damaged lymph hearts during the first postoperative week using electron-microscopic autoradiography. We present evidence that both, the satellite cell...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20476
更新日期:2015-12-01 00:00:00
abstract::Neurosecretory (Nsy) cells within the cerebral ganglion of Lumbricus terrestris were classified ultrastructurally. The Nsy cells within the subesophageal ganglion, nerve cord ganglion, and the peripheral nervous system were also examined. A comparative survey of Nsy cells of four other species of oligochaetes, Eisenia...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051970102
更新日期:1988-07-01 00:00:00