Results 91 to 100 of about 557 (123)
Spermiogenesis and spermatozoa in Acanthodasys aculeatus (Gastrotricha, Macrodasyida): an ultrastructural study [PDF]
Acta Zoologica, 2002 AbstractThe spermatogenesis, the spermiogenetic process and the structure of the mature spermatozoon of Acanthodasys aculeatus (Gastrotricha, Macrodasyida) are described from an ultrastructural point of view. Several spermatogonia in mitotic divisions were seen, proving that euthely of gastrotrichs does not concern gonads.
GUIDI, LORETTA +3 more
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Italian marine Gastrotricha: VI. Seven new species of Macrodasyida
Zootaxa, 2009 Seven species new to science are described from Italian waters, some of which also occur along nearby coasts: Macrodasys acrosorus n. sp. and M. digronus n. sp. in the family Macrodasyidae, Acanthodasys flabellicaudus n. sp., Diplodasys sanctimariae n. sp., Tetranchyroderma hyponiglarum n. sp., T. korynetum n. sp. and T. oligopentancrum n. sp.
Hummon W. D. +1 more
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Zootaxa, 2013 The present paper deals with description of three new marine gastrotrich species belonging to the genus Tetranchyroderma with a new record for Korea of T. schizocirratum Chang, Kubota & Shirayama, 2002, on the basis of specimens from the Korean coast. Tetranchyroderma anisoankyrum sp. nov.
Lee, Jimin +2 more
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Diversity and distribution of marine Gastrotricha along the northern beaches of the state of São Paulo (Brazil), with description of a new species ofMacrodasys(Macrodasyida, Macrodasyidae) [PDF]
Journal of Natural History, 2004 Forty-three putative species were found in this first-ever survey of the marine gastrotrich fauna of Brazil. Samples from 23 locations and 37 sites along the northern coasts of the state of Sao Paulo yielded 21 species of Macrodasyida (12 genera and five families) and 22 species of Chaetonotida (seven genera and two families).
TODARO, Mary Antonio Donatello +1 more
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Gastrotricha Macrodasyida from the Tromsø region, northern Norway
Sarsia, 2000 Abstract The paper is a systematic account of the macrodasyidan gastrotrichs of the Tromso region, northern Norway, collected in 1969 and 1992. Twenty-nine species (six new and three left in open nomenclature) representing all the six macrodasyidan families, are described or recorded. One new species, Desmodasys boreaiis sp. nov.
Ulf Båmstedt, Claus Clausen
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The unusual spermatozoa ofDolichodasyssp. (Gastrotricha, Macrodasyida) [PDF]
Proceedings of the Biological Society of Washington, 2017 Abstract The spermatozoon of an undescribed species of Dolichodasys (Cephalodasyidae) from the Pacific coast of Panama was studied at structural and ultrastructural levels. Under optical microscopy, it appears as a short and wide cell with pointed extremities but without a flagellum.
Guidi, L. +3 more
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The unique gravireceptor organs of Pleurodasys helgolandicus (Gastrotricha: Macrodasyida)
Zoomorphology, 2008The drumstick-like organs of the marine interstitial gastrotrich Pleurodasys helgolandicus Remane, 1927 were studied using optical and electron microscopy, in order to widen our knowledge of the sensory organs among gastrotrichs. The drumstick-like sensory organs are paired, symmetrical structures located on the dorsal side of the post-cephalic region ...
MAROTTA R. +2 more
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Morphology of the reproductive system and spermatozoa of Mesodasys adenotubulatus (Gastrotricha: Macrodasyida) [PDF]
Marine Biology, 1999 Mesodasys adenotubulatus Hummon, Todaro and Tongiorgi 1993 is a simultaneous hermaphrodite. Two club-shaped testes extend along the sides of the anterior intestine and show spermatogenetic stages maturing in a caudo-cephalic and centripetal direction. Sperm ducts join together dorsally to the intestine before opening into a pear-like caudal organ.
Elena Fregni +2 more
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Zoologischer Anzeiger, 2020
Abstract Spermatozoon morphology, spermatogenesis and reproductive system of Acanthodasys australis (Thaumastodermatidae) were studied at ultrastructural level. The spermatozoon is a filiform cell formed by a cork-screw-shaped acrosome, a helical nuclear–mitochondrial complex and a long flagellum.
Loretta Guidi +3 more
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Abstract Spermatozoon morphology, spermatogenesis and reproductive system of Acanthodasys australis (Thaumastodermatidae) were studied at ultrastructural level. The spermatozoon is a filiform cell formed by a cork-screw-shaped acrosome, a helical nuclear–mitochondrial complex and a long flagellum.
Loretta Guidi +3 more
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The evolution of the reproductive system of Urodasys (Gastrotricha: Macrodasyida)
Invertebrate Biology, 2014AbstractMacrodasyidan gastrotrichs are hermaphrodites with complex reproductive organs that function in sperm transfer and receipt, but homology among the organs of members of different clades remains undetermined, as does a broader understanding of evolutionary trends in the reproductive biology of macrodasyidans.
Sarah Atherton, Rick Hochberg
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