Electron Microscope Study on Sperm Differentiation in Perinereis brevicirris (Polychaeta)
نویسندگان
چکیده
منابع مشابه
A new species of Perinereis (Polychaeta, Nereididae) from Florida, USA, with a key to all Perinereis from the American continent
Specimens belonging to a new species of Perinereis Kinberg, 1865 were collected fromnatural oyster reefs in an estuarine environmenton Florida's southwest coast. The genus Perinereis includes more than 70 species, of which, Perinereis aibuhitensis (Grube, 1878), Perinereis brevicirrata (Treadwell, 1920), Perinereis camiguinoides (Augener, 1922), Perinereis jascooki Gibbs, 1972, Perinereis kuwai...
متن کاملSome Nereididae (Annelida: Polychaeta) from the Pacific Coast of Costa Rica.
Fifteen species of Nereididae (Annelida: Polychaeta) belonging to nine genera are reported from the subtidal and intertidal of the Pacific Coast of Costa Rica. A new species, Nereis costaricaensis, is described. Laeonereis brunnea Hartmann-Schröder 1959 is removed from synonomy with L. culveri (Webster 1880) while Perinereis seridentata (Hartmann-Schröder 1959) is moved from the genus Neanthes ...
متن کاملAn Electron Microscope Study of Spermatid Differentiation in the Toad, Bufo Arenarum Hensel
The differentiation of the spermatids of Bufo arenarum has been described from a study of electron micrographs of thin sections of testis. The development of the acrosome from the Golgi complex takes place in much the same manner as in mammalian spermatogenesis but no acrosome granule is formed. A perforatorium is described for the first time in this species. It is formed by a convergence of de...
متن کاملAn Electron Microscope Study of Spermatid Differentiation in the Toad, Bufo
The differentiation of the male germ cells into spermatozoa has long been a subject of particular interest to cytologists. In the period from 1890 through the first decade of the present century, Meves (28), McGregor (27), Ballowitz (2), and a number of other skilled observers made notable contributions to our understanding of the metamorphosis Of the germ cells in several vertebrate species. L...
متن کاملElectron Microscope Observations on Intracellular
Relatively few malignant neoplasms have been described in amphibia. The one that has been studied most extensively is the Luck6 renal adenocarcinoma of the frog, Rana pipiens. This malignant tumor occurs in from two to four per cent of frogs of this species, collected in the Lake Champlain region of northern Vermont and adjoining areas of Quebec. In a series of papers Luck6 described its histop...
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ژورنال
عنوان ژورنال: Cell Structure and Function
سال: 1977
ISSN: 0386-7196,1347-3700
DOI: 10.1247/csf.2.135