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A dendrobranchiate, Peisos petrunkevitchi (Decapoda, Sergestidae), with reptant‐like sperm: a spermiocladistic assessment
Author(s) -
Scelzo Marcelo A.,
Medina Antonio
Publication year - 2004
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.0001-7272.2004.00160.x
Subject(s) - biology , acrosome , spermatozoon , sperm , ultrastructure , centriole , anatomy , zoology , phylogenetics , phylogenetic tree , evolutionary biology , genetics , gene
The spermatozoon of Peisos petrunkevitchi differs significantly from those of any of the investigated dendrobranchiates in the anterior fusiform acrosome, lacking a spike, and embedded in (instead of capping) the nuclear region. In contrast, the position of the acrosome and the internal arrangement of its contents, as well as the apomorphic presence of a pair of centrioles (absent in all known dendrobranchiate spermatozoa) at the base of the acrosomal perforatorium, indicate a close affinity between this sperm plan and that found in reptants, especially anomurans and brachyurans. Based on the present and previous observations on decapod spermatozoal ultrastructure, we review the phylogeny of dendrobranchiate spermatozoa in the perspective of most recent phylogenetic analyses of malacostracan crustaceans.