Ultrastructure of the spermatozoa in the spider genus Pimoa : new evidence for the monophyly of Pimoidae plus Linyphiidae (Arachnida, Araneae). (American Museum novitates, no. 3682)

DSpace/Manakin Repository

Show simple item record

dc.contributor.author Michalik, Peter, 1976-
dc.contributor.author Hormiga, Gustavo.
dc.date.accessioned 2010-03-09T20:03:07Z
dc.date.available 2010-03-09T20:03:07Z
dc.date.issued 2010
dc.identifier.uri http://hdl.handle.net/2246/6045
dc.description 17 p. : ill. (some col.) ; 26 cm. "March 4, 2010." Includes bibliographical references (p. 14-17). en
dc.description.abstract The spermatozoa of spiders (Araneae) show a high structural diversity, resulting in several potential phylogenetic characters. In the present paper, we describe the spermatozoa of the spider family Pimoidae for the first time. We investigate four species of the genus Pimoa (P. altioculata, P. curvata, P. laurae, and P. edenticulata) by means of light and transmission electron microscopy. The male reproductive system consists of paired testes and long convoluted paired deferent ducts. The spermatozoa are generally characterized by: (1) a cylindrical acrosomal vacuole, (2) an acrosomal filament restricted to the precentriolar part of the nucleus, (3) a nuclear canal running in the periphery but projecting towards the posterior portion of the nucleus, (4) a short postcentriolar elongation of the nucleus, (5) a 9+0 axonemal pattern, and (6) cleistospermia as transfer form. The organization of the axoneme is of particular phylogenetic interest, since a 9+0 axonemal pattern was described within spiders only for the megadiverse family Linyphiidae, the sister group of Pimoidae. We have reconstructed the evolution of the axoneme using comparative spermatozoal data for 54 orbicularian species representing 11 families. We propose that the 9+0 axonemal pattern is a new synapomorphy for Pimoidae + Linyphiidae. The phylogenetic and evolutionary implications of other potential sperm characters (e.g., length of the postcentriolar elongation of the nucleus) are discussed. en
dc.format.extent 11469958 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher New York, NY : American Museum of Natural History. en
dc.relation.ispartofseries American Museum novitates, no. 3682. en
dc.subject Pimoa. en
dc.subject Spermatozoa. en
dc.subject Spiders. en
dc.title Ultrastructure of the spermatozoa in the spider genus Pimoa : new evidence for the monophyly of Pimoidae plus Linyphiidae (Arachnida, Araneae). (American Museum novitates, no. 3682) en
dc.title.alternative Spermatozoa of Pimoidae. en

Files in this item

This item appears in the following Collection(s)

  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

Show simple item record

Search DSpace


Advanced Search

Browse

My Account