Gonadal development and sex differentiation in the cichlid fish Cichlasoma dimerus (Teleostei, Perciformes): a light- and electron-microscopic study.

abstract：:Two types of sperm are produced in the silkworm, Bombyx mori. Nucleate eupyrene sperm is an ordinary sperm that contributes to fertilization, while anucleate apyrene sperm is considered to play important roles in assisting eupyrene sperm. At the very late stage of spermatogenesis, a phenomenon called "peristaltic sque...

journal_title：Journal of morphology

authors： Sahara K,Kawamura N

更新日期：2004-01-01 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：:Burrow construction in the subterranean Ctenomys talarum (Rodentia: Ctenomyidae) primarily occurs by scratch-digging. In this study, we compared the limbs of an ontogenetic series of C. talarum to identify variation in bony elements related to fossorial habits using a morphometrical and biomechanical approach. Diamete...

journal_title：Journal of morphology

authors： Echeverría AI,Becerra F,Vassallo AI

更新日期：2014-08-01 00:00:00

abstract：:Data describing segmental masses and moments of inertia (MOI) of limb segments are required for inverse dynamic calculations. In horses, these values are usually calculated using regression equations that have been developed from a limited number of horses representing a small number of breeds. The objective of the pr...

journal_title：Journal of morphology

authors： Nauwelaerts S,Clayton HM

更新日期：2018-07-01 00:00:00

abstract：:Tooth development and replacement in fetal and adult viviparous caecilians (Amphibia: Gymnophiona) are described and analyzed according to current theories of tooth succession. The fetal dentition differs from that of the adult in morphology, position, and function. Teeth are used by fetuses to scrape the oviducal epi...

journal_title：Journal of morphology

authors： Wake MH

更新日期：1976-01-01 00:00:00

abstract：:Bats are distributed worldwide from tropical to temperate regions. Despite their wide geographical radiation and advances in studies using evolutionary approaches, aspects related to the reproduction of these animals remain poorly explored, especially those related to the male reproductive accessory glands (RAGs). Thu...

journal_title：Journal of morphology

authors： Santos RTS,Pires LRM,Albernaz ESS,Andrade CS,Santiago CS,Morielle-Versute E,Taboga SR,Beguelini MR

更新日期：2018-02-01 00:00:00

abstract：:During ontogeny, the apical and basal components of dicamptodontid teeth exhibit three major developmental stages: nonpedicellate, subpedicellate, and pedicellate. Premetamorphic larvae tend to have nonpedicellate teeth, incompletely or recently metamorphosed individuals tend to have subpedicellate teeth, and fully tr...

journal_title：Journal of morphology

authors： Beneski JT Jr,Larsen JH Jr

更新日期：1989-02-01 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

authors： Anton E,Yavorskaya MI,Beutel RG

更新日期：2016-05-01 00:00:00

abstract：:After placing in vitro, central subgerminal ooplasm (containing a central nucleus of Pander) from a quail germ disc of a prelaid egg (before symmetrization) on the upper layer of an isolated chicken antisickle, we observed the induction of a radially oriented preneural plate (without interference of chordamesoblast). ...

journal_title：Journal of morphology

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

更新日期：2004-05-01 00:00:00

abstract：:The skull of neotenic individuals of the Alpine Newt Triturus alpestris from the locality Drakolimni (Greece) is described on the basis of models made from magnified serial frontal sections. In order to recognize features associated with neoteny and paedomorphosis, the results were compared with normal development of ...

journal_title：Journal of morphology

authors： Roček Z

更新日期：1996-11-01 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

authors： Mukai H,Oda S

更新日期：1980-08-01 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

authors： Crawford BJ,Chia FS

更新日期：1978-07-01 00:00:00

abstract：:Ultrastructure and deposition of the cuticles secreted by embryos representing eight insect orders were examined by transmission and scanning electron microscopy. Embryos of the apterygote silverfish Thermobia domestica deposit two embryonic cuticles. Deposition of the first (EC1) is initiated at the beginning of appe...

journal_title：Journal of morphology

authors： Konopová B,Zrzavý J

更新日期：2005-06-01 00:00:00

abstract：:The medaka, Oryzias latipes, is a model organism in experimental biology. Its ontogeny and osteology have been studied frequently, but no detailed description of its cranial anatomy exists. Based on manual dissections, histological slide sections, and 3D-reconstructions, we describe the anatomy of the jaw apparatus of...

journal_title：Journal of morphology

authors： Werneburg I,Hertwig ST

更新日期：2009-09-01 00:00:00

abstract：:The orbital Harderian gland of the common tree shrew (Tupaia glis) was investigated at the macroscopic and microscopic levels. In the glands of both sexes only one acinar cell type was found. The cell is characterized by the presence of numerous lipid vacuoles of variable size and by a small number of PAS-positive, el...

journal_title：Journal of morphology

authors： Pradidarcheep W,Asavapongpatana S,Mingsakul T,Poonkhum R,Nilbu-nga S,Somana R

更新日期：2003-03-01 00:00:00

abstract：:Among species of the Chiroptera, spermatogenesis and the fully differentiated spermatozoa differ in morphological and ultrastructural detail. This study therefore aimed to ultrastructurally characterize the spermatogenesis and the spermatozoa of Carollia perspicillata (Phyllostomidae) and compare the process with othe...

journal_title：Journal of morphology

authors： Beguelini MR,Bueno LM,Caun DL,Taboga SR,Morielle-Versute E

更新日期：2014-01-01 00:00:00

abstract：:Previously we showed that type XII collagen (col XII) is highly upregulated in the regenerating newt (Notophthalmus viridescens) forelimb. Here, using immunohistochemistry and in situ hybridization, we studied the pattern of expression of col XII during early stages of adult newt tail regeneration. The results show th...

journal_title：Journal of morphology

authors： Wei Y,Tassava RA

更新日期：1996-11-01 00:00:00

abstract：:Sexual selection can lead to rapid evolution of sexual traits and striking morphological diversity across taxa. In populations where competition for mates is intense, males sometimes evolve distinct behavioral strategies along with morphological differences that help them secure mating opportunities. Strong postcopula...

journal_title：Journal of morphology

authors： Gilman CA,Corl A,Sinervo B,Irschick DJ

更新日期：2019-02-01 00:00:00

abstract：:The Eurasian lynx (Lynx lynx) is a medium-sized felid, with a tendency to hunt for prey larger than itself. We studied the lynx hindlimb musculoskeletal anatomy in order to determine possible anatomical adaptations to hunting large prey. In our previous work, we had found characters of both large and small felids in t...

journal_title：Journal of morphology

authors： Viranta S,Holmala K,Laakkonen J

更新日期：2021-01-25 00:00:00

abstract：:The segmental anatomy of Harmothoë imbricata deviates from the plan of a typical errant polychaete only slightly. The body is partitioned into 37 nonmetameric segments and is covered by 15 pairs of elytra. The segmental musculature consists of paired dorsal and ventral longitudinal muscles, pairs of dorso-ventral musc...

journal_title：Journal of morphology

authors： Lawry JV Jr

更新日期：1971-11-01 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：:A survey of skeletal muscles throughout craniates shows basic kinds of myosin filament arrangement, simple-lattice and superlattice, within the A-band of each sarcomere. Distribution of simple- and superlattice arrangements across a phylogeny of craniates suggests that the superlattice arrangement is primitive and tha...

journal_title：Journal of morphology

authors： Luther PK,Squire JM,Forey PL

更新日期：1996-09-01 00:00:00

abstract：:Spermiogenesis in the South American leptodactylid frog Odontophrynus cultripes was analyzed ultrastructurally. The spermatids undergo morphological modification while still enclosed in microtubule-rich processes of Sertoli cells. Electron-dense plates resembling junctional structures appear in regions at which the sp...

journal_title：Journal of morphology

authors： Báo SN,Dalton GC,de Oliveira SF

更新日期：1991-03-01 00:00:00

abstract：:We describe the complex shapes of myomeres and myosepta in the mackerels and tunas (Scombridae: Teleostei), and we reveal the orientation of two major systems of collagen fibers in myosepta and horizontal septa with respect to points of attachment to skeleton and skin. Our goal is to identify the likely pathways of th...

journal_title：Journal of morphology

authors： Westneat MW,Hoese W,Pell CA,Wainwright SA

更新日期：1993-08-01 00:00:00

abstract：:The cuticle-lined foregut of Derocheilocaris remanei consists of the mouth with its associated labrum, and an undifferentiated esophagus. It is separated from the midgut by an esophageal valve. The labrum is a conspicuous structure moved by five pairs of muscles (four dorsoventral and one longitudinal). Four pairs of ...

journal_title：Journal of morphology

authors： Herrera-Alvarez L,Fernández I,Benito J,Pardos F

更新日期：1996-11-01 00:00:00

abstract：:Prey capture in Agama stellio was recorded by high-speed video in combination with the electrical activity of both jaw and hyolingual muscles. Quantification of kinematics and muscle activity patterns facilitated their correlation during kinematic phases. Changes in angular velocity of the gape let the strike be subdi...

journal_title：Journal of morphology

authors： Herrel A,Cleuren J,De Vree F

更新日期：1995-06-01 00:00:00

abstract：:Mandible development in the larval stages I-V of two palaemonid shrimp species, Palaemon elegans and Macrobrachium amazonicum, was analyzed using scanning electron microscopy, light microscopy, and confocal laser scanning microscopy. In contrast to the zoea I of P. elegans, first-stage larvae of M. amazonicum are nonf...

journal_title：Journal of morphology

authors： Batel A,Melzer RR,Anger K,Geiselbrecht H

更新日期：2014-11-01 00:00:00

abstract：:The antennal circulatory organ of Periplaneta americana and Blaberus craniifer was investigated by light and electron microscopy. This organ consists of two pulsatile ampullae located near the antennal base which are interconnected by a large transverse muscle and associated blood vessels which run into the antennae. ...

journal_title：Journal of morphology

authors： Pass G

更新日期：1985-08-01 00:00:00

abstract：:The flagellum of the thysanopteran spermatozoon has been examined by electron microscopy and computer-aided image analysis. The flagellum consists of 27 microtubular elements that probably are formed as outgrowths from three separate basal bodies. Nine of the elements are normal microtubular doublets that carry dynein...

journal_title：Journal of morphology

authors： Dallai R,Afzelius BA,Lanzavecchia S,Bellon PL

更新日期：1991-09-01 00:00:00

abstract：:Light and electron microscopy reveal that simple receptor cells in the jaw epithelium of sea urchin pedicellariae are connected by nerve tracts to the neuropile that coordinates jaw movements. The muscles responsible for jaw opening and closure and for flexion of the stem are all innervated in this neuropile. At least...

journal_title：Journal of morphology

authors： Peters BH,Campbell AC

更新日期：1987-07-01 00:00:00