Sperm ultrastructure in Bathypolypus bairdii and B. sponsalis (Cephalopoda: Octopoda).

abstract：:Ultrastructural observations and glyoxilic acid-induced fluorescence of catecholamines indicate that tracts of axons lie at the base of the ciliary bands and run throughout their length in bipinnaria and brachiolaria larvae of Pisaster ochraceus. Two types of nerve cells occur at regular intervals within the ciliary b...

journal_title：Journal of morphology

authors： Burke RD

更新日期：1983-10-01 00:00:00

abstract：:Little is known about specific proteins involved in keratinization of the epidermis of snakes. The presence of histidine-rich molecules, sulfur, keratins, loricrin, transglutaminase, and isopeptide-bonds have been studied by ultrastructural autoradiography, X-ray microanalysis, and immunohistochemistry in the epidermi...

journal_title：Journal of morphology

authors： Alibardi L

更新日期：2005-05-01 00:00:00

abstract：:Among egg-brooding hylid frogs there is much interspecific variation in the degree of development of the young at hatching. In certain species of Gastrotheca the eggs hatch into free-living tadpoles, whereas in others (and in the genera Amphignathodon, Cryptobatrachus, Stefania and Hemiphractus) the eggs hatch directl...

journal_title：Journal of morphology

authors： Wassersug RJ,Duellman WE

更新日期：1984-10-01 00:00:00

abstract：:Light and electron microscopic examination demonstrated two types of non-endocrine agranular cells, cavity boundary cells and stellate cells, in the adenohypophysis of the South American lungfish, Lepidosiren paradoxa. The cavity boundary cells line the hypophyseal cleft and diverticulum and display few microvilli, oc...

journal_title：Journal of morphology

authors： Chiba A,Oka S,Honma Y,Ishiyama M

更新日期：1991-01-01 00:00:00

abstract：:Data from adult birds, crocodilians, Sphenodon, squamates, turtles, and from the chick embryo are compared to test conflicting hypotheses of homology of the deep dorsal thigh muscles of birds and other reptiles. This comparison suggests that: (1) avian Mm. iliofemoralis externus and iliotrochantericus caudalis (herein...

journal_title：Journal of morphology

authors： Rowe T

更新日期：1986-09-01 00:00:00

abstract：:Sixty-seven specimens of the common North Atlantic asteroid, Asterias vulgaris, were collected at seasonal intervals over a 2-year period and their testes observed with both light and electron microscopy. In the germinal epithelium, a predictable series of interactions between versatile somatic cells and germinal cell...

journal_title：Journal of morphology

authors： Walker CW

更新日期：1980-10-01 00:00:00

abstract：:Feeding mechanics of vertebrates depend on physical constraints of the surrounding media, water or air. Such functions are inseparably combined with form. The aim of this study is to show this linkage for the pleurodiran freshwater turtle Pelusios castaneus and, additionally, to point out the major functional and biom...

journal_title：Journal of morphology

authors： Lemell P,Beisser CJ,Weisgram J

更新日期：2000-05-01 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

authors： Greven H,Richter S

更新日期：2009-11-01 00:00:00

abstract：:It is well established that the capacity for teeth to differentiate "in vitro" depends upon: a) the age of the embryonic rudiments at the time of excision and b) the number of cells within each tissue type which are capable of differentiating into organ culture. This paper studies ultrastructural aspects of tooth buds...

journal_title：Journal of morphology

authors： Lemus D,Paz de la Vega Y,Fuenzalida M,Illanes J

更新日期：1980-09-01 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

authors： Anaya-López P,Ramírez-Pinilla MP

更新日期：2017-03-01 00:00:00

abstract：:The apical area of larvae of four primitive pulmonate species was investigated by means of serial ultrathin and light microscope sections. Cephalic sensory organs (CSOs) were found in the larvae of Onchidium cf. branchiferum (Onchidiidae) and Laemodonta octanfracta (Ellobiidae), while no trace of the organ was present...

journal_title：Journal of morphology

authors： Ruthensteiner B,Schaefer K

更新日期：2002-01-01 00:00:00

abstract：:Stauromedusae have relatively few macromorphological characters, making both their taxonomy and identification difficult. For this reason, histological characters are also employed in the taxonomy of the group. This study presents a detailed description of the histomorphology of Haliclystus antarcticus Pfeffer, 1889 (...

journal_title：Journal of morphology

authors： Miranda LS,Collins AG,Marques AC

更新日期：2013-12-01 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

authors： Mukai H,Saito Y,Watanabe H

更新日期：1987-09-01 00:00:00

abstract：:Five types of hemocytes, prohemocytes, typical plasmatocytes, coagulocytes, spherule cells, and oenocytoides, have been defined in the last larval instar of Heliothis armigera on the basis of ultrastructural microscopy, smears, and optical phase-contrast microscopy. Modifications in typical plasmatocytes and coagulocy...

journal_title：Journal of morphology

authors： Essawy M,Maleville A,Brehélin M

更新日期：1985-12-01 00:00:00

abstract：:Exceptional variability in the shell of the pancake tortoise Malacochersus tornieri, both in the keratinous surficial scutes and the underlying bones, in addition to its remarkably fenestrated bony shell are unique among tortoises. Based on 14 individuals of different sizes and ages, the observed variation in M. torni...

journal_title：Journal of morphology

authors： Mautner AK,Latimer AE,Fritz U,Scheyer TM

更新日期：2017-03-01 00:00:00

abstract：:The sequential changes during spermatogenesis in the testis of two species of caecilians, Ichthyophis tricolor (Ichthyophiidae) and Uraeotyphlus cf. narayani (Uraeotyphliidae), of Western Ghats of Kerala, India, were traced using both histological techniques and transmission electron microscopy. The cell nests were as...

journal_title：Journal of morphology

authors： Smita M,Oommen OV,Jancy MG,Akbarsha MA

更新日期：2004-07-01 00:00:00

abstract：:The cytoarchitecture of nuclei in the preoptic area, ventral thalamus, dorsal thalamus, epithalamus, hypothalamus, posterior tuberculum, synencephalon, and pretectum and the accessory optic nuclei was analyzed in a perciform teleost, the sea bass Dicentrarchus labrax, by using serial sections stained with cresyl-viole...

journal_title：Journal of morphology

authors： Cerdá-Reverter JM,Zanuy S,Muñoz-Cueto JA

更新日期：2001-03-01 00:00:00

abstract：:Blood vessels in Nereis japonica were studied by electron microscopy. It was found that blood vessels regardless of location were similar in the basic organization of the basal lamina and the usual presence of collagen fibrils on the vessel wall. Differences arise, depending on whether the outside of the basal lamina ...

journal_title：Journal of morphology

authors： Nakao T

更新日期：1974-10-01 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

authors： Downing Meisner A,Burns JR,Weitzman SH,Malabarba LR

更新日期：2000-11-01 00:00:00

abstract：:1. Forty-eight species of oribatids in 37 families representing most of the superfamilies were collected from various environments (littoral, salt marsh, litter, sod, and freshwater) and sectioned. 2. The coxal gland is composed of a sacculus and a labyrinth in all stages of all oribatid species. Muscles, originating ...

journal_title：Journal of morphology

authors： Woodring JP

更新日期：1973-04-01 00:00:00

abstract：:Two of the forearm flexors of the horse, the superficial and deep digital flexor muscles, are critical to support the digital and fetlock joints, exhibit differing insertions, and are passively supported by the proximal and distal check ligaments, respectively. These two muscles differ in histochemical composition and...

journal_title：Journal of morphology

authors： Hermanson JW,Cobb MA

更新日期：1992-06-01 00:00:00

abstract：:The morphology of the spermatozoon of representative species of the subfamily Nesomyinae (Muroidea: Nesomyidae), a monophyletic group of rodents endemic to Madagascar, was examined by light and electron microscopy to determine the sperm head shape and tail length across the species. Marked interspecific differences we...

journal_title：Journal of morphology

authors： Ding X,Leigh CM,Goodman SM,Bedford JM,Carleton MD,Breed WG

更新日期：2010-12-01 00:00:00

abstract：:Amphisbaenians are fossorial, predominantly limbless squamate reptiles with distinct cranial shapes corresponding to specific burrowing behaviors. Due to their cryptic lifestyles and the scarcity of museum specimens, little is known of their intraspecific variation, particularly regarding cranial osteology. This repre...

journal_title：Journal of morphology

authors： Hipsley CA,Rentinck MN,Rödel MO,Müller J

更新日期：2016-09-01 00:00:00

abstract：:Sexual dimorphism in the distribution of antennal sense organs is common among adults of the genus Periplaneta. In three out of the four strains of Periplaneta americana examined, adult males had more contact chemoreceptros than females. In the fourth strain of P. americana and in P. australasiae, P. brunnea, P. fulig...

journal_title：Journal of morphology

authors： Schafer R,Sanchez TV

更新日期：1976-06-01 00:00:00

abstract：:An ovarian follicle of Drosophila consists of an oocyte, 15 nurse cells, and hundreds of follicular epithelial cells. A freeze-fracture analysis of the surfaces between glutaraldehyde-fixed ovarian cells showed that all three cell types were interconnected by gap junctions. This is the first report of gap junctions be...

journal_title：Journal of morphology

authors： Giorgi F,Postlethwait JH

更新日期：1985-07-01 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

authors： Stark JB,O'Grady PM

更新日期：2010-01-01 00:00:00

abstract：:Mites of the genus Veigaia are common gamasid inhabitants of forest litter. They engage in the peculiar reproductive strategy of podospermy which, along with other morphological and behavioral adaptations, involves modification of the chelicerae of the relatively rare males into gonopods. Each movable digit is provide...

journal_title：Journal of morphology

authors： Di Palma A,Alberti G,Nuzzaci G,Krantz GW

更新日期：2006-02-01 00:00:00

abstract：:Patterns of growth and variation of the appendicular skeleton were examined in Thorius, a speciose genus of minute terrestrial plethodontid salamanders from southern Mexico. Observations were based primarily on ontogenetic series of each of five species that collectively span the range of adult body size in the genus;...

journal_title：Journal of morphology

authors： Hanken J

更新日期：1982-10-01 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

authors： Hillenius WJ

更新日期：2000-07-01 00:00:00

abstract：:Astroblepidae or "climbing catfishes" encompass a single genus of species living in high altitude rivers in the Andes of South America. They are characterized by a specialized head morphology closely resembling their better known, widely radiated sister family Loricariidae, or armored suckermouth catfishes. Existent d...

journal_title：Journal of morphology

authors： De Crop W,Pauwels E,Van Hoorebeke L,Geerinckx T

更新日期：2013-10-01 00:00:00