Reproduction of the salamander Siren intermedia le conte with especial reference to oviducal anatomy and mode of fertilization.

abstract：:The common snook, Centropomus undecimalis, was induced to ovulate using a time-release, GnRH analogue. Ovulation occurred the afternoon or evening the day after hormone administration. The time of ovulation was established within half an hour. At ovulation, three fish per time-group were divided into 0, 6, 12, 18 hr a...

journal_title：Journal of morphology

authors： Grier HJ,Neidig CL,Quagio-Grassiotto I

更新日期：2017-04-01 00:00:00

abstract：:To elucidate the cellular mechanism underlying the growth of the peritoneal cover of the gut sinus and the heart in the polychaete Arenicola marina, cellular organization of these structures and proliferative potential of their cells were investigated using electron microscopy and electron microscopic autoradiography....

journal_title：Journal of morphology

authors： Martynova MG,Chaga OY

更新日期：2002-12-01 00:00:00

abstract：:The structure of the thumus in adult specimens of a marine teleost, the cling fish Sicyases sanguineus, has been studied by light and transmission electron microscopy. Most cling fishes have an outer thymus located beneath the opercular epithelium. A few of them, however, have a large inner thymus besides a poorly dev...

journal_title：Journal of morphology

authors： Gorgollon P

更新日期：1983-07-01 00:00:00

abstract：:The plainfin midshipman fish, Porichthys notatus, is a nocturnal marine teleost that uses social acoustic signals for communication during the breeding season. Nesting type I males produce multiharmonic advertisement calls by contracting their swim bladder sonic muscles to attract females for courtship and spawning wh...

journal_title：Journal of morphology

authors： Mohr RA,Whitchurch EA,Anderson RD,Forlano PM,Fay RR,Ketten DR,Cox TC,Sisneros JA

更新日期：2017-11-01 00:00:00

abstract：:The phylogenetic position of bryozoans has been disputed for decades, and molecular phylogenetic analyzes have not unequivocally clarified their position within the Bilateria. As probably the most basal bryozoans, Phylactolaemata is the most promising taxon for large-scale phylogenetic comparisons. These comparisons r...

journal_title：Journal of morphology

authors： Schwaha T,Handschuh S,Redl E,Walzl MG

更新日期：2011-03-01 00:00:00

abstract：:Although the overall pattern and timing of gonadal sex differentiation have been established in a considerable number of teleosts, the ultrastructure of early stages of gonadal development is not well documented. In this study, gonads from larval and juvenile stages of laboratory-reared Cichlasoma dimerus were examine...

journal_title：Journal of morphology

authors： Meijide FJ,Lo Nostro FL,Guerrero GA

更新日期：2005-05-01 00:00:00

abstract：:In the present investigation the right intracranial portion of the trochlear nerves and dorsal oblique muscle of the right ocular globe were removed from six adult dogs and analyzed by light and electron microscopy. Unmyelinated fibers were observed in the analyzed nerves. The number, diameter, area, and density of my...

journal_title：Journal of morphology

authors： Vivo J,Morales JL,Diz A,Galisteo AM,Monterde JG,Blanco A,Agüera E

更新日期：2004-12-01 00:00:00

abstract：:Body length is one of the most important factors that influence organismal function and ecological niche. Although larger animals tend to have a suite of physiological advantages, such as lower mass-specific metabolic rates and lower costs of transport, they may also experience significant limitations to unsteady loco...

journal_title：Journal of morphology

authors： Kahane-Rapport SR,Goldbogen JA

更新日期：2018-09-01 00:00:00

abstract：:The vascular system of the digits of the tokay is more complex than has hitherto been suspected and has a configuration which suggests it is intimately involved in the process of adhesion. Distinction can be made between lamellae (expanded scales beneath the proximal portion of the digit) and scansors (elaborations of...

journal_title：Journal of morphology

authors： Russell AP

更新日期：1981-09-01 00:00:00

abstract：:The mouthparts of female Corethrella brakeleyi and C. wirthi were studied using light and electron microscopy. Mandibles, hypopharynx and labium are highly sclerotized and are modified for obtaining blood meals. All structures were larger in C. brakeleyi than in C. wirthi except mandibular and hypopharyngeal teeth; th...

journal_title：Journal of morphology

authors： McKeever S,Pound JM

更新日期：1979-08-01 00:00:00

abstract：:The evolution of viviparity alters the physical relationship between mothers and offspring and the prevalence of viviparity among squamate reptiles presents an opportunity to uncover patterns in the evolution of placental structure. Understanding the breadth of this diversity is limited because studies of placental st...

journal_title：Journal of morphology

authors： Stewart JR,Mendez de la Cruz FR

更新日期：2019-01-01 00:00:00

abstract：:Early embryonic mitosis of the silkworm, Bombyx mori, was morphologically studied in the normal eggs and in the eggs treated by low temperature (-10°C). The first embryonic mitosis is observed in the eggs at 120 to 150 minutes after deposition at 26°C. After egg and sperm pronuclei unite, a spindle is formed in each o...

journal_title：Journal of morphology

authors： Kawamura N

更新日期：1978-10-01 00:00:00

abstract：:This work is concerned with the ultrastructural organization and some histochemical features of the vacuolar cells of the demosponge Oscarella lobularis. Vacuolar cells are characterized by large clear vacuoles containing an aqueous fluid. They are commonly found in the mesohyl of this sponge and tend to constitute a ...

journal_title：Journal of morphology

authors： Gaino E,Burlando B,Buffa P

更新日期：1986-04-01 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

authors： Didier DA,Stahl BJ,Zangerl R

更新日期：1994-10-01 00:00:00

abstract：:Tardigrada, commonly called water bears, is a taxon of microscopic panarthropods with five-segmented bodies and four pairs of walking legs. Although tardigrades have been known to science for several centuries, questions remain regarding many aspects of their biology, such as embryogenesis. Herein, we used scanning el...

journal_title：Journal of morphology

authors： Gross V,Minich I,Mayer G

更新日期：2017-04-01 00:00:00

abstract：:The ultrastructure of a well studied insect chemosensory unit is presented in this report. Two separate lumina are present in this chemosensory unit, the trichogen and sensillar lumina. The fluid within the trichogen lumen exclusively bathes the dendritic terminals, and may be involved with the reception and/or modula...

journal_title：Journal of morphology

authors： Felt BT,Vande Berg JS

更新日期：1976-11-01 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

authors： Eckelbarger KJ,Larson RJ

更新日期：1993-11-01 00:00:00

abstract：:Three regions of the byssus of the marine mussel Mytilus edulis L. are distinct in structural organization at the macroscopic and microscopic level and in amino acid composition. The threads that emanate from the stem at the base of the foot are divided into two regions. The proximal, elastic region has a crimped, den...

journal_title：Journal of morphology

authors： Benedict CV,Waite JH

更新日期：1986-09-01 00:00:00

abstract：:The female reproductive system of Sphaerodema rusticum consists of a pair of ovaries, two lateral oviducts, a median common oviduct, and a median spermatheca. Accessory glands are absent. Each ovary has five free ovarioles branching from the oviduct. Each ovariole consists of a terminal filament, germarium, vitellariu...

journal_title：Journal of morphology

authors： Jawale SM,Ranade DR

更新日期：1990-08-01 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：:The sharpness and thus information content of the retinal image in the eye depends on the optical quality of the lens and its accurate positioning in the eye. Multifocal lenses create well-focused color images and are present in the eyes of all vertebrate groups studied to date (mammals, reptiles including birds, amph...

journal_title：Journal of morphology

authors： Gustafsson OS,Ekström P,Kröger RH

更新日期：2010-08-01 00:00:00

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

authors： Hall JA,Larsen JH Jr,Fitzner RE

更新日期：2002-05-01 00:00:00

abstract：:A large sample of embryological material of the North American paddlefish Polyodon spathula (Acipenseriformes: Polyodontidae) confirms that early development in Polyodon is very similar to that reported for the sister group of Polyodontidae, the sturgeons (Acipenseridae). Polyodon illustrates many basic aspects of aci...

journal_title：Journal of morphology

authors： Bemis WE,Grande L

更新日期：1992-07-01 00:00:00

abstract：:We studied early neurulation events in vitro by transplanting quail Hensen's node, central prenodal regions (before the nodus as such develops), or upper layer parts of it on the not yet definitively committed upper layer of chicken anti-sickle regions (of unincubated blastoderms), eventually associated with central b...

journal_title：Journal of morphology

authors： Callebaut M,Van Nueten E,Van Passel H,Harrisson F,Bortier H

更新日期：2006-07-01 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

authors： Krenn HW,Bauder JA

更新日期：2018-03-01 00:00:00

abstract：:The development of two of the cranial lateral line canals is described in the cichlid, Archocentrus nigrofasciatus. Four stages of canal morphogenesis are defined based on histological analysis of the supraorbital and mandibular canals. "Canal enclosure" and "canal ossification" are defined as two discrete stages in l...

journal_title：Journal of morphology

authors： Tarby ML,Webb JF

更新日期：2003-01-01 00:00:00

abstract：:The ultrastructure of the coxal glands and associated tissues in the centipedes Lithobius forficatus and Lithobius crassipes has been examined in the light of two contrasting functional hypotheses postulated by different authors. Lithobiomorph chilopods possess eight sets of pores on the posterioventral border of the ...

journal_title：Journal of morphology

authors： Littlewood PMH

更新日期：1983-08-01 00:00:00

abstract：:From the elongated neck of the giraffe to the elaborate train of the peacock, extreme traits can result from natural or sexual selection (or both). The extreme chelicerae of the long-jawed spiders (Tetragnatha) present a puzzle: do these exaggerated chelicerae function as weapons or genitalia? Bristowe first proposed ...

journal_title：Journal of morphology

authors： Danielson-François A,Sullivan HN

更新日期：2020-10-19 00:00:00

abstract：:The oval olfactory rosette of the carp Labeo rohita belongs to Burne's ('09) rosette column one or to Bateson's (1889) rosette type three. The total olfactory area of the fish is greater than its total retinal area; however, it has been classified with Teichmann's ('54) group of eye-nose fishes. Each olfactory chamber...

journal_title：Journal of morphology

authors： Ojha PP,Kapoor AS

更新日期：1973-05-01 00:00:00

abstract：:Internal and external head structures of males of Strepsiptera were examined and the head of a species of Mengenilla is described in detail. The results suggest a reinterpretation of some structures. The head of basal extant strepsipterans is subprognathous, whereas it is strictly orthognathous in the groundplan of St...

journal_title：Journal of morphology

authors： Beutel RG,Pohl H

更新日期：2006-05-01 00:00:00