Ultrastructural observations of spermatozoa and spermiogenesis in Wandella orana Gray, 1994 (Araneae: Filistatidae) with notes on their phylogenetic implications.

摘要: Abstract Spermatozoa and spermiogenesis of the prithine filistatid spider Wandella orana are described. The produces coenospermia, i.e. sperm aggregations that include several single cells commonly surrounded by a secretion sheath. One sectioned coenospermium in W. contains at least five spermatozoa. During copulation many coenospermia transferred into female. Coenospermia regarded as peculiar transfer form which occurs early derivative spiders such Liphistiomorphae Mygalomorphae. only exception was found Araneomorphae until now filistatine Filistata insidiatrix . Our observation is second case supports view Filistatidae represent an taxon. Furthermore, individual show characteristics also may be being plesiomorphic. There cone-shaped acrosomal vacuole, very long filament, rather stout nucleus small implantation fossa. axoneme shows 9×2+3 pattern microtubules synapomorphic Megoperculata (Uropygi, Amblypygi Araneae). finding two distant taxa have consequences for phylogenetic systematic considerations.