Mitochondrial changes in flight muscles of normal and flightless Drosophila melanogaster with age.

abstract：:The morphology of ctenostome bryozoans remains little investigated with only few species having been subject to more detailed studies. From all the seven main different superfamilies, only few representatives have been studied. The superfamily Arachnidioidea has particularly been neglected concerning detailed morpholo...

journal_title：Journal of morphology

authors： Schwaha T,De Blauwe H

更新日期：2020-12-01 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：:Developmental studies of the Recent Australian lungfish, Neoceratodus forsteri, show that this species has two sets of functional tooth-bearing bones in the lower jaw of young hatchlings. These coincide with an early stage in the life history when the fish is strictly carnivorous. In N. forsteri, a paired tooth-bearin...

journal_title：Journal of morphology

authors： Kemp A

更新日期：1995-09-01 00:00:00

abstract：:Although mating has been described in several hermit crab species, the mechanics of spermatophore transfer have not previously been demonstrated. Evidence from pleopod and gonopore morphology, video observations, and inseminated females indicates that in Clibanarius vittatus the male applies a spermatophoric mass dire...

journal_title：Journal of morphology

authors： Hess GS,Bauer RT

更新日期：2002-08-01 00:00:00

abstract：:The structural organization of the spermatozoon from the Eurasian beaver, Castor fiber (Family: Castoridae), was determined and compared to that of other sciuromorph rodents. The beaver spermatozoon has a head, which is variable in form but usually paddle-shaped, with a small nucleus and very large acrosome, and a tai...

journal_title：Journal of morphology

authors： Bierla JB,Gizejewski Z,Leigh CM,Ekwall H,Söderquist L,Rodriguez-Martinez H,Zalewski K,Breed WG

更新日期：2007-08-01 00:00:00

abstract：:The morphogenesis and ultrastructure of the epidermis of snake embryos were studied at progressive stages of development through hatching to determine the time and modality of differentiation of the shedding complex. Scales form as symmetric epidermal bumps that become slanted and eventually very overlapped. During th...

journal_title：Journal of morphology

authors： Alibardi L

更新日期：2002-02-01 00:00:00

abstract：:Studies on birds have led to the hypothesis that increased intestinal absorption between enterocytes (paracellular) evolved as a compensation for smaller intestinal size in fliers, which was perhaps selected to minimize the mass of digesta carried. This hypothesis predicts that bats will also exhibit relatively reduce...

journal_title：Journal of morphology

authors： Zhang ZQ,Brun A,Price ER,Cruz-Neto AP,Karasov WH,Caviedes-Vidal E

更新日期：2015-01-01 00:00:00

abstract：:A comparative study of four genera of arvicolid rodents (Clethrionomys, Eothenomys, Alticola, and Synaptomys) presents the first complete description of limb myology for any member of this recently evolved, highly successful family. The study also identifies four forelimb and four hind-limb muscles that exhibit charac...

journal_title：Journal of morphology

authors： Stein BR

更新日期：1986-03-01 00:00:00

abstract：:The fate and possible roles of the cytoskeleton in the process of conjugation in the hyptrich ciliate Euplotes aediculatus were investigated. Following the coalescence of the plasma membranes of the conjugant cells, a fusion zone or bridge of cytoplasm contributed by both partners is constructed. The sub-alveolar micr...

journal_title：Journal of morphology

authors： Geyer JJ,Kloetzel JA

更新日期：1987-04-01 00:00:00

abstract：:Hind foot drumming is a form of seismic signaling that plays a vital role in the communication of several Bathyergidae species. Hind foot drumming is initiated by the rapid movement of the whole hind limb by flexion and extension of the hip and knee. This study aimed to determine if morphological adaptations of the hi...

journal_title：Journal of morphology

authors： Sahd L,Bennett NC,Kotzé SH

更新日期：2020-04-01 00:00:00

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

authors： Alibardi L

更新日期：2004-02-01 00:00:00

abstract：:The masticatory pattern of Sphenodon punctatus, the sole remaining rhynchocephalian, now restricted to islands off the coast of New Zealand, has been analyzed by detailed anatomy, cinematography, cinefluoroscopy, and electromyography. Food reduction consists of a closing, crushing bite followed by a propalineal slidin...

journal_title：Journal of morphology

authors： Gorniak GC,Rosenberg HI,Gans C

更新日期：1982-03-01 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：:All developmental stages of Tanystylum bealensis are described. This is the first complete developmental series of a pycnogonid species collected from a natural, rather than a laboratory-reared population. Development proceeds through a series of nine instars from egg to adult, with major defining characteristics of t...

journal_title：Journal of morphology

authors： Gillespie JM,Bain BA

更新日期：2006-03-01 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：:Despite the attention squamate lizards have received in the study of digit and limb loss, little is known about limb morphogenesis in pentadactyl lizards. Recent developmental studies have provided a basis for understanding lizard autopodial element homology based on developmental and comparative anatomy. In addition,...

journal_title：Journal of morphology

authors： Leal F,Tarazona OA,Ramírez-Pinilla MP

更新日期：2010-11-01 00:00:00

abstract：:Two free-living marine euplotid ciliates, Pseudodiophrys nigricans and Diophrys japonica, collected from the coastal waters off Qingdao, northern China, were investigated using live observations and protargol impregnation methods. The cortical development of P. nigricans was observed during binary division. Although i...

journal_title：Journal of morphology

authors： Fan Y,Warren A,Al-Farraj SA,Chen X,Shao C

更新日期：2013-04-01 00:00:00

abstract：:Septate junctions develop initially just basad from apical junctional complexes at the apical ends of regenerating gastrodermal cells. The first morphological indication of differentiation of the junction is the appearance of gentle undulations of the plasma membranes of apposing cells. Subsequently dense dots develop...

journal_title：Journal of morphology

authors： Hori I

更新日期：1987-06-01 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

authors： Opell BD

更新日期：1988-05-01 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：: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：: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

authors： Murray JR,Varian-Ramos CW,Welch ZS,Saha MS

更新日期：2013-10-01 00:00:00

abstract：:Salamanders possess kidneys with two distinct regions: a caudal pelvic portion and cranial genital portion. Nephrons of the pelvic region are responsible for urine formation and transport. Nephrons of the genital region transport sperm from testes to Wolffian ducts; however, nephrons of the genital region possess all ...

journal_title：Journal of morphology

authors： Hartley J,Gribbins KM,Siegel DS

更新日期：2019-10-01 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

authors： Hunt RM Jr,Korth WW

更新日期：1980-05-01 00:00:00

abstract：:To investigate whether the thickness of the cornea in snakes correlates with overall anatomy, habitat or daily activity pattern, we measured corneal thickness using optical coherence tomography scanning in 44 species from 14 families (214 specimens) in the collection at the Natural History Museum (Denmark). Specifical...

journal_title：Journal of morphology

authors： Da Silva MO,Gade JT,Damsgaard C,Wang T,Heegaard S,Bertelsen MF

更新日期：2020-02-01 00:00:00

abstract：:This study examines the allometric scaling relationships of the cetacean humerus, radius, and ulna. Bone lengths and diameters were measured for 20 species of odontocete and three species of mysticete cetaceans, representing eight of the nine extant cetacean families. The scaling of individual bone proportions (bone l...

journal_title：Journal of morphology

authors： Dawson SD

更新日期：1994-11-01 00:00:00

abstract：:The origins and evolution of the three major clades of modern amphibians are still a source of controversy, and no general consensus exists as to their relationship to the various known Paleozoic taxa. This may indicate that additional character complexes should be studied to resolve their phylogenetic relationship. T...

journal_title：Journal of morphology

authors： Sigurdsen T,Bolt JR

更新日期：2009-12-01 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：:Transmission electron microscopy reveals that the spermatocytes of the hookworm Ancylostoma caninum contain an abundance of Golgi complexes, ribosomes, specialized membranous organelles, and long strands of smooth endoplasmic reticulum. These organelles remain abundant until the early spermatid stage of sperm developm...

journal_title：Journal of morphology

authors： Ugwunna SC

更新日期：1990-03-01 00:00:00

abstract：:Cubozoans have a complex lifecycle in many ways similar to the scyphozoan lifecycle. The sexual reproduction within cubozoans varies between species with one clade having copulation and internal fertilization and the release of planula larvae. This cubozoan clade, the family Tripedaliidae, includes three species, Copu...

journal_title：Journal of morphology

authors： Helmark S,Garm A

更新日期：2019-10-01 00:00:00