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 family Percidae exhibits especially great variation in dorsal fin spacing, including fishes with separated fins of varying gap length and fishes with contiguous fins. We hypothesized that fishes with separated dorsal fins, especially those with large gaps between fins, would have stiffened fin elements at the leading edge of the soft dorsal fin to resist hydrodynamic loading during locomotion. For 10 percid species, we measured the spacing between dorsal fins and calculated the second moment of area of selected spines and lepidotrichia from museum specimens. There was no significant relationship between the spacing between dorsal fins and the second moment of area of the leading edge of the soft dorsal fin.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Weickhardt AF,Feilich KL,Lauder GVdoi
10.1002/jmor.20744subject
Has Abstractpub_date
2017-12-01 00:00:00pages
1716-1725issue
12eissn
0362-2525issn
1097-4687journal_volume
278pub_type
杂志文章abstract::During epidermal differentiation in mammals, keratins and keratin-associated matrix proteins rich in histidine are synthesized to produce a corneous layer. Little is known about interkeratin proteins in nonmammalian vertebrates, especially in reptiles. Using ultrastructural autoradiography after injection of tritiated...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10181
更新日期:2004-02-01 00:00:00
abstract::Clasper gland morphology and development in Potamotrygon magdalenae and its relation with the acquisition of reproductive maturity is described in males of different developmental stages (embryos, neonates, juveniles, and reproductively active and resting adults). The glands are subcutaneous masses in the proximal bas...
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::The spermatozoal ultrastructure in three solenocerid shrimps (Solenocera membranacea, S. africana, and Pleoticus muelleri) from different Atlantic locations was examined with the aim of increasing understanding of the phylogenetic relationships in the Dendrobranchiata. A considerable structural similarity between the ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10404
更新日期:2006-03-01 00:00:00
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 mat...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051590104
更新日期:1979-01-01 00:00:00
abstract::Zebra Finches (Taeniopygia guttata) are the most commonly used laboratory songbird species, yet their embryological development has been poorly characterized. Most studies to date apply Hamburger and Hamilton stages derived from chicken development; however, significant differences in development between precocial and...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20165
更新日期:2013-10-01 00:00:00
abstract::Annual fish development differs from that of other teleosts because a phase of blastomere dispersion-reaggregation spatially and temporally separates epiboly from embryogenesis. The fate of dispersed blastomeres was assessed in diblastodermic eggs of the annual fishes Cynolebias whitei and C. nigripinnis. In typical t...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052150309
更新日期:1993-03-01 00:00:00
abstract::Postembryonic skeletal ontogeny of the pelobatid frog Scaphiopus intermontanus is described based on a developmental series of cleared-and-stained, whole-mount specimens. The focus is on laboratory-reared individuals fed a herbivorous diet as larvae. Although there is variation in the timing of ossification of individ...
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::External and internal structures of the head of adults of Clambus are described and illustrated in detail. The results are compared with structural features found in the clambid genus Calyptomerus, in representatives of other scirtoid families, and also in species of other coleopteran suborders, notably Myxophaga. The...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20524
更新日期:2016-05-01 00:00:00
abstract::Cytoplasmic microtubules can be divided into two subpopulations: 1) those adjacent to the nucleus (perinuclear), and 2) those distributed between the myofilament bundles (nonperinuclear). Previous observations (Cartwright and Goldstein, '83) indicate total cytoplasmic microtubule numeric density increases to a maximum...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051790103
更新日期:1984-01-01 00:00:00
abstract::African lungfish (Protopterus) seem unique among osteognathostomes in possessing a potential vomeronasal organ homolog in form of accessory epithelial crypts within their nasal cavity. Many details regarding structural and functional properties of these crypts are still unexplored. In this study, we reinvestigate the ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20673
更新日期:2017-06-01 00:00:00
abstract::Features of embryonic development in birds traditionally have been assumed to be shared by sauropsids in general. Herein, we document a pattern of yolk processing and cellularization in the Eastern fence lizard (Sceloporus undulatus) that is fundamentally different from that of birds. In the avian pattern, cells of th...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20892
更新日期:2018-11-01 00:00:00
abstract::South American Pipidae show a unique reproductive mode, in which the fertilized eggs develop in temporarily formed brood chambers of the dorsal skin after eggs have been deposited on the back of the female. We studied the skin incubation of Pipa carvalhoi using light microscopy and scanning electron microscopy. The sk...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10759
更新日期:2009-11-01 00:00:00
abstract::The oral dentition and type and number of taste buds (TB) on the lips and in the oropharyngeal cavity were compared by means of SEM in 11 species of cardinal fishes (Apogonidae) belonging to five genera. The occurrence of a dense cover of skin papillae on the lips of some species (e.g., Apogon frenatus), as well as di...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10186
更新日期:2004-03-01 00:00:00
abstract::Fourteen species of leiognathid fishes (Perciformes, Leiognathidae) from the Philippine Islands, Thailand, Japan, Indonesia, and Palau were examined for accessory secondary sexual dimorphism. Thirteen species exhibit either external dimorphism (a clear patch of skin on the flanks of males, a large clear patch of skin ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051820105
更新日期:1984-10-01 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
abstract::Swimming crabs of the taxon Portunoidea show specialized, paddle-shaped fifth pereiopods (P5), which play a role in these crabs' ability to swim. In this study, the morphology of the fifth pereiopod in swimming and non-swimming crabs was studied in detail and the mobility in the articulations between podomeres was cal...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.21268
更新日期:2020-12-01 00:00:00
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
pub_type: 杂志文章
doi:10.1002/jmor.20625
更新日期:2017-02-01 00:00:00
abstract::The form and function of the hesperiid feeding apparatus was studied in detail. The butterflies in the family Hesperiidae are of particular interest because the longest proboscis ever recorded in Papilionoidea was found in the Neotropical genus Damas. We focused on the functional morphology by comparing proboscis morp...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20780
更新日期:2018-03-01 00:00:00
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
pub_type: 杂志文章
doi:10.1002/1097-4687(200011)246:2<131::AID-JMOR7>3.0.
更新日期:2000-11-01 00:00:00
abstract::A description of the external morphogenesis of male and female embryos of X. ferrugineus, derived from in vivo observation, is presented here. The embryogenesis of this beetle is typical of the Coleoptera, and is also similar in most respects to the generalized insect plan. Observed unusual aspects of X. ferrugineus e...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051520205
更新日期:1977-05-01 00:00:00
abstract::This research was designed to follow up the observation of Thornton and Kraemer ('51) that regressed, denervated limbs of Ambystoma larvae will not regenerate upon reinnervation if all digits on the limbs were not completely resorbed. The object of this experiment was to determine whether the presence of an apical str...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051540204
更新日期:1977-11-01 00:00:00
abstract::Fine structural changes in mitochondrial morphology pertaining to size, number and growth were examined in flight muscles of normal and experimentally dewinged male Drosophila melanogaster ranging up to 26 days of age. In the normal winged flies, the number of mitochondria decreases during the first week of adult lif...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051450307
更新日期:1975-03-01 00:00:00
abstract::The combined techniques of light microscopy, scanning (SEM) and transmission (TEM) electron microscopy were used for the first time to study the structure of unicameral lungs of a Tegu lizard (Tupinambis nigropunctatus). The lungs are prolate spheroid bags with blood supplied by superficial branches of a dorsal pulmon...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051610303
更新日期:1979-09-01 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
pub_type: 杂志文章
doi:10.1002/jmor.1051530308
更新日期:1977-09-01 00:00:00
abstract::Andean frogs of the genus Telmatobius occur at high elevations, they have an aquatic mode of life and large tadpoles. There are more than 60 species that closely resemble one another and have low values of genetic divergence. However, the skeleton, particularly the cranium, is interspecifically variable with respect t...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20855
更新日期:2018-09-01 00:00:00
abstract::The process of coelomic pouch formation in Pisaster ochraceus was studied with light microscopy, transmission and scanning electron microscopy and time-lapse cinemicrography as well as with the drug cytochalasin B. As in most asteroids, the paired coelomic pouches of Pisaster ochraceus are formed from outpocketing of ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051570107
更新日期:1978-07-01 00:00:00
abstract::The stomach of decapods is a complex organ with specialized structures that are delimited by a cuticle. The morphology and ontogeny of the stomach are largely described, but few studies have focused on the morphology of its cuticle. This study examined the morphology of the stomach cuticle of cardiac sacs, gastric mil...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20949
更新日期:2019-03-01 00:00:00
abstract::Following a study on the changes occurring in a bdelloid species (Macrotrachela quadricornifera, Rotifera, Bdelloidea) when entering anhydrobiosis, we investigated the changes in morphology, including weight and volume during the transition from the active hydrated to the dormant anhydrobiotic state by scanning electr...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10579
更新日期:2008-02-01 00:00:00
abstract::The red pulp of the spleens of the short-finned pilot whale (Globicephala macrorhynchus) and the Pacific bottle-nosed dolphin (Tursiops truncatus gilli) (Odontoceti) were examined by light and electron microscopy and found to comprise two venous layers, an inner and an outer. The inner layer is homologous to the inter...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052210210
更新日期:1994-08-01 00:00:00
abstract::Remarkably preserved specimens of Cowralepis mclachlani Ritchie, 2005 (Proc Linn Soc NSW 126:215-259) (Phyllolepida, Placodermi) represent a unique ontogenetic sequence adding to our understanding of anatomy, function, and phylogeny among basal jawed vertebrates (gnathostomes). A systematic review demonstrates that th...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10719
更新日期:2009-07-01 00:00:00