Abstract：
:Several flatfish species exhibit the unusual feature of bilateral asymmetry in prey capture kinematics. One species, Pleuronichthys verticalis, produces lateral flexion of the jaws during prey capture. This raises two questions: 1) How are asymmetrical movements generated, and 2) How could this unusual jaw mechanism have evolved? In this study, specimens were dissected to determine which cephalic structures might produce asymmetrical jaw movements, hypotheses were formulated about the specific function of these structures, physical models were built to test these hypotheses, and models were compared with prey capture kinematics to assess their accuracy. The results suggest that when the neurocranium rotates dorsally the premaxillae slide off the smooth, rounded surface of the vomer (which is angled toward the blind, or eyeless, side) and are "launched" anteriorly and laterally. The bilaterally asymmetrical trajectory of the upper jaw is determined by the orientation of the "launch pad," the vomer. During lower jaw depression, the mandibles rotate about their articulations with the quadrate bones of the suspensoria. The quadrato-mandibular joint is positioned farther anteriorly on the eye side than on the blind side, and this asymmetry deflects the lower jaw toward the blind side. Asymmetry in the articular surfaces of the lower jaw augments this effect. Thus, it appears that fish with intermediate forms of this asymmetrical movement could have evolved from symmetrical ancestors via a few key morphological changes. In addition, similar morphological modifications have been observed in other fish taxa that also produce jaw flexion during feeding, which suggests that there may be convergence in the basic mechanism of asymmetry.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Gibb ACdoi
10.1002/jmor.10042keywords:
subject
Has Abstractpub_date
2003-04-01 00:00:00pages
1-12issue
1eissn
0362-2525issn
1097-4687journal_volume
256pub_type
杂志文章abstract：:The oviducts of 24 tortoises (Gopherus polyphemus) were examined using histological techniques and scanning electron microscopy to determine endometrial morphology. Measurements of endometrial characteristics (epithelial cell height, cilia length, thickness of endometrial glandular layer, and glandular diameter) in th...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052040310
更新日期：1990-06-01 00:00:00
abstract：:Statoblasts of five higher phylactolaemates were compared morphologically. As a result, they were divided into two groups: Group I comprising Lophopus crystallinus, Lophopodella carteri, and Pectinatella gelatinosa, and Group II comprising Pectinatella magnifica and Cristatella mucedo. These two groups are thought to ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051650203
更新日期：1980-08-01 00:00:00
abstract：:For the first time the scanning electron microscope was used to compare developmental changes in scorpion embryos and the first and second stadia. In the buthid species of this study, Centruroides vittatus, and all other scorpions, the newborn climb up on their mother's back and remain there without feeding for severa...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10227
更新日期：2005-07-01 00:00:00
abstract：:We investigated growth-related and sex-related morphological changes in the skulls of 144 North Pacific common minke whales Balaenoptera acutorostrata. Measurement was conducted at 39 points on the skull and mandible to extract individual allometric equations relating the length and zygomatic width of the skull. The r...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20288
更新日期：2014-10-01 00:00:00
abstract：:Only species belonging to the bryozoan subtaxon Phylactolaemata possess an epistome. To test whether there is a specific coelomic cavity inside the epistome, Fredericella sultana, Plumatella emarginata, and Lophopus crystallinus were studied on the ultrastructural level. In F. sultana and P. emarginata, the epistome c...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10691
更新日期：2009-03-01 00:00:00
abstract：:Eggs of Xenopoecilus sarasinorum possess two distinct types of filaments on the surface of the egg envelope (chorion), long, attaching filaments restricted to the vegetal pole and weak, nonattaching filaments around the animal pole (micropyle). Both types are formed during oogenesis. After mature eggs were spawned thr...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10620
更新日期：2008-06-01 00:00:00
abstract：:New schemata of the liver are presented to discuss the combination of the three kinds of liver lobules known until today in a chalk-talk-manner. Terminology is also discussed. Further investigations are needed involving the construction and the vascular pattern of compound lobules of the three individial lobules of th...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051620204
更新日期：1979-11-01 00:00:00
abstract：:The development of the morphologic features of neurons in the anterior dorsal ventricular ridge (ADVR) has been followed in Golgi preparations from the lizard Gallotia galloti between embryonic stage 32 and post-eclosion stages of specimens 3.6-4.5 cm in length. The differentiation sequence of multipolar and bitufted ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052030305
更新日期：1990-03-01 00:00:00
abstract：:The fine structure of the mid-gut musculature of the desert locust, Schistocerca gregaria is described and compared with that of the visceral muscles of other species. The gross morphology and fine structure of the nervous system which supplies the mid-gut muscle fibres is described. ...
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：:Sipuncula is a clade of unsegmented marine worms that are currently placed among the basal radiation of conspicuously segmented Annelida. Their new location provides a unique opportunity to reinvestigate the evolution and development of segmented body plans. Neural segmentation is clearly evident during ganglionic ven...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21054
更新日期：2019-11-01 00:00:00
abstract：:The results of an ultrastructural investigation of the gastric glands of the ruin lizard are reported. In this reptile the stomach can be divided into a larger fundus and a smaller pars pilorica. Fundic glands are characterized by three main kinds of cells: mucous, endocrine, and oxynticopeptic; the latter were not ob...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(200002)243:2<167::AID-JMOR
更新日期：2000-02-01 00:00:00
abstract：:During the long starvation period (November to June) of the lizard (Varanus exanthematicus), pancreatic B cells undergo profound modification. The degeneration of beta granules observed in electron microscopy appears correlated with the diminution of the immunoreactive insulin-like content of the pancreas. The analogy...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051800302
更新日期：1984-06-01 00:00:00
abstract：:The chimaeroid holocephalian fishes are distinguished among extant chondrichthyans by the possession of three pairs of tooth plates, evergrowing and partially hypermineralized, that are not shed and replaced like the teeth of living elasmobranchs. Although derivation of the chimaeroid tooth plate from the fusion of me...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052220108
更新日期：1994-10-01 00:00:00
abstract：:To our knowledge, this paper presents the first description of neuroendocrine complexes in invertebrates. Neuroendocrine complexes have been identified in the lamina propria of the snail gut by light microscopy using Giemsa-stained, deplasticized sections and by electron microscopy. Silver impregnations and immunocyto...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051990307
更新日期：1989-03-01 00:00:00
abstract：:In uloborid spiders, eye loss is accompanied by increased visual angles, optical material investment, and potential visual acuity of the retained eyes. Relative to carapace volume, the six-eyed Hyptiotes cavatus and two four-eyed Miagrammopes species have greater retinal hemisphere areas and lens volumes than do the e...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051960202
更新日期：1988-05-01 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：: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：:The dermopteran basicranium combines a primitively constructed and oriented auditory bulla formed by ectotympanic, rostral entotympanic, and tubal cartilage with derived features of the middle ear transformer and internal carotid circulation. Living dermopterans possess a primitive eutherian auditory region that has b...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051640206
更新日期：1980-05-01 00:00:00
abstract：:The mode of sexual reproduction and embryogenesis was compared in 3 species of Botrylloides: B. simodensis, B. lenis, and B. violaceus. In all species, a testis and an egg (occasionally 2 eggs), the former being anterior to the latter, mature in the mantle on either side of a zooid. The egg is surrounded by 2 follicul...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051930305
更新日期：1987-09-01 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 innervation of the musculature of the tongue and the hyobranchial apparatus of caecilians has long been assumed to be simple and to exhibit little interspecific variation. A study of 14 genera representing all six families of caecilians demonstrates that general patterns of innervation by the trigeminal, facial, g...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052120105
更新日期：1992-04-01 00:00:00
abstract：:The uptake and retention of radiolabeled estradiol by both the male and female reproductive organs were examined in the baboon. Two male and two female baboons were injected intracardially with 1 microgram/kg body weight of 3H-estradiol and two animals, one male and one female, were injected with both labeled and 100 ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051720203
更新日期：1982-05-01 00:00:00
abstract：:The different elements of the caudal skeleton of the South American catfish genera Nematogenys (Nematogenyinae) and Trichomycterus, Hatcheria, and Bullockia (Pygidiinae) (Siluriformes, Trichomycteridae) show Ontogenetic transformation of the second ural centrum in Trichomycteridae separates the subfamilies Nematogenyi...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051770208
更新日期：1983-08-01 00:00:00
abstract：:We investigated muscle development in the Japanese flounder Paralichthys olivaceus, focusing primarily on the cranial muscles, using a whole mount immunohistochemical staining method. It is well established that during the very early stages of morphogenesis, until 4 days post hatching (dph), muscles required for feedi...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10833
更新日期：2010-07-01 00:00:00
abstract：:The ovarian follicles of Ctenosaura pectinata exhibit a clear seasonal cycle in morphology. Early in development, each oocyte is surrounded by a granulosa composed of a single layer of cuboidal or squamous cells and thin thecal layers. As folliculogenesis progresses, the granulosa becomes multilayered and composed of ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(199610)230:1<99::AID-JMOR8
更新日期：1996-10-01 00:00:00
abstract：:Reproduction was studied in a South Carolina population of the paedomorphic salamander Siren intermedia with emphasis on anatomy of the female oviduct. The oviduct forms 67-79% of the snout-vent length in this elongate species and can be divided into three portions. The atrium, 7-13% of oviducal length, is the narrow ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(199603)227:3<335::AID-JMOR
更新日期：1996-03-01 00:00:00
abstract：:Complete postorbital bars, bony arches that encompass the lateral aspect of the eye and form part of a circular orbit, have evolved homoplastically multiple times during mammalian evolution. Numerous functional hypotheses have been advanced for postorbital bars, the most promising being that postorbital bars function ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10334
更新日期：2005-06-01 00:00:00
abstract：:The aim of this work was to study the postnatal ontogenetic development of Pontoporia blainvillei skull, identifying major changes on shape, and relating them to relevant factors in the life history of the species. We analyzed a complete ontogenetic series (73♂, 83♀) with three-dimensional geometric morphometric techn...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20309
更新日期：2014-12-01 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
doi：10.1002/jmor.10632
更新日期：2008-07-01 00:00:00
abstract：:The correlation between skin structure and hydrodynamic design of the dorsal fin of the harbor porpoise (Phocoena phocoena) was examined. For the study of fin morphology and geometry, a scheme of sampling representing a two-parameter mesh on the fin surface was used. At each data point the thickness of the epidermis, ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10135
更新日期：2003-12-01 00:00:00
