Living without mitochondria : spermatozoa and spermatogenesis in two species of Urodasys (Gastrotricha, Macrodasyida) from dysoxic sediments
Articolo
Data di Pubblicazione:
2007
Citazione:
Living without mitochondria : spermatozoa and spermatogenesis in two species of Urodasys (Gastrotricha, Macrodasyida) from dysoxic sediments / M. Balsamo, L. Guidi, L. Pierboni, R. Marotta, M.A. Todaro, M. Ferraguti. - In: INVERTEBRATE BIOLOGY. - ISSN 1077-8306. - 126:1(2007), pp. 1-9.
Abstract:
The spermatozoa of two species of Macrodasyida (Gastrotricha), Urodasys
anorektoxys and U. acanthostylis, show an ultrastructural organization diverging from one another and from other gastrotrichs: their main peculiarity is in the absence of mitochondria. In U. anorektoxys, the acrosome is a long, twisted column inserted into the nucleus, which is basally cylindrical, and the flagellum shows rows of peculiar, large globules parallel to the
axonemal doublets. In U. acanthostylis, the acrosome is completely cork-screwed and surrounds the nucleus, and the tail shows columnar accessory fibers. At present, the absence of mitochondria in the mature sperm, and the peculiar fingerprint aspect of condensed chromatin are the only traits shared by the two species. The features of the spermatozoa of these two species of Urodasys widen the range of different models of gastrotrich spermatozoa, and place the genus in a peculiar position, from the spermatological point of view, within the
Macrodasyida. The loss of mitochondria in mature spermatozoa is possibly related to either the dysoxic habitat of the two species or a peculiar fertilization mechanism.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Gastrotricha ; spermatozoa ; spermatogenesis ; ultrastructure ; mitochondria
Elenco autori:
M. Balsamo, L. Guidi, L. Pierboni, R. Marotta, M.A. Todaro, M. Ferraguti
Link alla scheda completa: