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A NEW KIND OF SEXUAL DIMORPHISM IN ORDOVICIAN OSTRACODES
Author(s) -
SCHALLREUTER ROGER,
HINZSCHALLREUTER INGELORE
Publication year - 2007
Publication title -
palaeontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.69
H-Index - 63
eISSN - 1475-4983
pISSN - 0031-0239
DOI - 10.1111/j.1475-4983.2007.00637.x
Subject(s) - sexual dimorphism , ordovician , genus , mating , paleontology , group (periodic table) , biology , evolutionary biology , geology , zoology , physics , quantum mechanics
In Ordovician ostracodes (genus Incisua ) a new kind of sexual dimorphism is described, which is the first example among this group with males being the heteromorphs. The valves of males are larger and less frequent than the females, and are characterized by having a furrow in the ventral part. The furrow may have functioned as a device to enable the two sexes to cling together during mating.