Abstract:
:An otolith increment is composed of an incremental zone and a discontinous zone. Observation of the otoliths of Oreochromis niloticus with transmission and scanning electron microscopy reveals that organic fibers are concentrated in the discontinuous zone and are relatively scarce in the incremental zone. On the other hand, calcium carbonate crystals are chiefly packed in the incremental zone and are less dense in the discontinuous zone. Both fibers and crystals are oriented perpendicular to the growth increments. Otolith checks, or discontinuities, contain even denser fibers and fewer fine crystals than does the discontinuous zone. A higher proportion of individual fibers is prominently stained in the discontinuous zone and check than in the incremental zone. Other features of individual fibers appear to be the same among the three zones. The crystals on either side of a check or a discontinuous zone resemble each other both in size and orientation. Zonation of protein and mineral components of otoliths can be understood in terms of both incremental growth and the daily cycle of deposition.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Zhang Zdoi
10.1002/jmor.1052110210subject
Has Abstractpub_date
1992-02-01 00:00:00pages
213-220issue
2eissn
0362-2525issn
1097-4687journal_volume
211pub_type
杂志文章abstract::We provide a detailed description of the larval morphology of the Great Basin spadefoot toad (Scaphiopus intermontanus), a species with documented morphological variability in larval structures associated with feeding. We based our findings on laboratory-raised individuals fed a herbivorous diet. We characterized the ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1094
更新日期:2002-05-01 00:00:00
abstract::The coiled shell of gastropods begins as a cap-shaped lens of organic and calcified material that covers the posterior dorsal side of the larva. During development the cap enlarges to cover the larval visceral mass. Marginal growth then produces the characteristic coiled shell. One model of the initiation of shell coi...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199801)235:1<77::AID-JMOR6
更新日期:1998-01-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051750106
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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
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199808)237:2<147::AID-JMOR
更新日期:1998-08-01 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:2011-08-01 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:2009-09-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052070109
更新日期:1991-01-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1983-07-01 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:2010-08-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051980110
更新日期:1988-10-01 00:00:00
abstract::High speed cinematography was used to record the feeding activities of terrestrial Ambystoma tigrinum melanostictum. A description of these activities based on films of more than 50 feeding sequences is presented, and the mechanical units involved are defined, described, and functionally analyzed. Evolutionary implica...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051470203
更新日期:1975-10-01 00:00:00
abstract::Despite the embryological and anatomical disparities present among lophotrochozoan phyla, there are morphological similarities in the cellular arrangements of ciliated cells used for propulsion among the nonfeeding larval forms of kamptozoans, nemerteans, annelids, mollusks, and bryozoans. Evaluating whether these sim...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10592
更新日期:2008-03-01 00:00:00
abstract::Two different patterns of wing venation are currently supposed to be present in each of the three orders of Paraneoptera. This is unlikely compared with the situation in other insects where only one pattern exists per order. We propose for all Paraneoptera a new and unique interpretation of wing venation pattern, assu...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.11036
更新日期:2012-05-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051440207
更新日期:1974-10-01 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:1997-11-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051560208
更新日期:1978-05-01 00:00:00
abstract::An ultrastructural study of the ovary of the sessible jellyfish, Haliclystus octoradiatus, indicates that it is fundamentally different from that of other scyphozoans and is the most structurally complex within the class. Oocytes develop within a series of spherical, sac-like ovarian follicles consisting of an enlarge...
journal_title:Journal of morphology
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更新日期:1993-11-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1984-09-01 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:1984-06-01 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:1988-01-01 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:1996-02-01 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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更新日期:2020-12-01 00:00:00
abstract::The gonads from three hermaphrodite species of different invertebrate phyla were studied at the ultastructure level. In the flatworm Dugesia biblica, male germ cells in different stages of development lay in the lumen of testicular follicles surrounded by overlapping parietal cells. The intercellular space formed by c...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051920304
更新日期:1987-06-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051920106
更新日期:1987-04-01 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:1990-10-01 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:1987-06-01 00:00:00
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更新日期:1977-11-01 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:1985-06-01 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:2019-12-01 00:00:00