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Ultrastructure of the Geogarypus nigrimanus Spermatozoon (Arachnida, Pseudoscorpionida)
Author(s) -
Dallai Romano,
Callaini Giuliano
Publication year - 1990
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.1990.tb01179.x
Subject(s) - spermatozoon , acrosome , biology , ultrastructure , flagellum , anatomy , sperm , nucleus , microbiology and biotechnology , semen , paleontology , botany , bacteria
The ultrastructure of the spermatozoon of Geogarypus nigrimanus (Arachnida, Pseudoscorpionida) is described. The spermatozoon is composed of a small elliptic nucleus, a short flagellum and a very long and complex acrosome. In the male genital ducts, as in other studied species of pseudoscorpions, the sperm components are rolled up to form a globular structure enclosed in a cyst wall. The Geogarypus spermatozoon with a reduced flagellum and a giant acrosome seems to be evolutionary more advanced than spermatozoa from other pseudoscorpions.