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The fine structure of the spermatozoon of Pennaria tiarella (coelenterata)
Author(s) -
Summers Robert G.
Publication year - 1970
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051310108
Subject(s) - centriole , spermatozoon , biology , flagellum , nucleus , golgi apparatus , anatomy , cilium , electron microscope , vesicle , axoneme , protein filament , microbiology and biotechnology , ultrastructure , membrane , physics , optics , biochemistry , genetics , endoplasmic reticulum , gene
Spermatozoa of the hydroid Pennaria tiarella were examined with the electron microscope. The anterior region is characterized by the presence of 30–40 membrane‐bounded vesicles which lie anterior to the nucleus. These vesicles are apparently derived from the Golgi apparatus. The nucleus is conical in shape with a protrusion at the anterior end. Posteriorly it is indented by four radially arranged mitochondria. Lying within the fossa formed by the mitochondria are proximal and distal (filament forming) centrioles. The distal centriole is characterized by nine centriole satellite projections which emanate from its matrix. The tubules of the distal centriole are continuous with the alpha filaments of the tail. The tails are typical 9 + 2 flagella with 9 peripheral doublet (or alpha) filaments surrounding two central (or beta) filaments.