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- Title
Ultrastructural observations on the spermatozoa of a species of Lepidodasys (Gastrotricha, Macrodasyida).
- Authors
Pierboni, L.; Kristensen, R.
- Abstract
The ultrastructure of the spermatozoon of a species in the marine gastrotrich genus Lepidodasys is described. The filiform cell is composed of a cork-screw acrosome, a long single mitochondrion surrounded by a helical nucleus, and a flagellum with a 9 × 2 + 2 axonemal arrangement. The structure of the sperm of this species from Denmark appears closely similar to those of the other two species of Lepidodasys studied so far from Italy and Florida (US). Peculiar features (cylindrical nucleus, absence of a periaxonemal sheath) place this genus far from the others in the family Lepidodasyidae. The absence of synapomorphies between Lepidodasys and other genera of Lepidodasyidae suggests that the family is polyphyletic. The sperm ultrastructure fully fits the species of Lepidodasys into the marine order Macrodasyida, with the sperm ground plan of which its sperm shares a number of details.
- Subjects
GASTROTRICHA; ULTRASTRUCTURE (Biology); SPERMATOZOA analysis; MARINE species diversity; MACRODASYOIDEA
- Publication
Helgoland Marine Research, 2007, Vol 61, Issue 3, p217
- ISSN
1438-387X
- Publication type
Article
- DOI
10.1007/s10152-007-0068-5