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The spermatozoon of Branchiostoma lanceolatum L
Author(s) -
Baccetti Baccio,
Burrini Anna G.,
Dallai Romano
Publication year - 1972
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.1051360206
Subject(s) - spermatozoon , biology , acrosome , flagellum , nucleus , sperm , anatomy , ultrastructure , centriole , microbiology and biotechnology , semen , genetics , gene
Abstract Under the electron microscope, the spermatozoon of Branchiostoma lanceolatum shows a spherical nucleus deeply grooved along its caudal third, a bistratified acrosome enriched by plentiful subacrosomal material, two centrioles, mitochondria fused into a single mass surrounding the centriolar region which is highly asymmetrical, a 9 + 2 flagellum tilted with respect to the longitudinal symmetry axis of the nucleus. The sperm of Branchiostoma shares the overall features of that of the Tunicata and fits in perfectly with the phylogenetic position of the Leptocardia.