Curini Galletti, Marco and Puccinelli, Ileana (1989) Karyometric and morphological analysis of two sympatric marine species of the Gyratrix hermaphroditus complex (Platyhelminthes: Kalyptorhynchia) occurring at Roscoff (Brittany, France). Hydrobiologia, Vol. 173 (1), p. 63-68. eISSN 1573-5117. Article.
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Two marine sibling species of the Gyratrix hermaphroditus complex were found to occur sympatrically at Roscoff (Brittany, France). Both share the same chromosome number 2n = 6, but differ for the values of centromeric indices, length ratio of chromosomes and absolute length of the haploid genome. Differences were also found in body size and male cuticular apparatus morphology. They are furthermore distinct for the above characters from the other two marine species of the complex already known (from the Mediterranean and the North Sea). Chromosomal evolution and phylogenetical relationships within the marine species of the G. hermaphroditus complex are discussed in detail.
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