Abstract
A new species of polychaete, Stratiodrilus vilae, epizoic on Parastacus brasiliensis (von Martens, 1869) and P. defossus Faxon, 1898, is described from the State of Rio Grande do Sul, southern Brazil. The new species has one pair of long, anal, conical ventral lobes, one on each side of the anus, claspers in the males, and one pair of tubercles in each of the posterior locomotor appendages; and the jaw apparatus not reaching the limit between the head and the first segment.
Highlights
Histriobdella van Beneden, 1858, found on eggs of lobsters in Europe and in North America, Stratiodrilus Haswell, 1900, found in the branchial chamber of freshwater crayfishes in Australia, Madagascar and South America, and Dayus Steiner & Amaral, 1999, collected from the pleopods of a marine isopod in South Africa are the three genera of epizoic, ectocommensal polychaetes in Histriobdellidae
Stratiodrilus vilae differs from all species of Stratiodrilus, except S. pugnaxi for having one pair of long, anal, conical, ventral lobes (AcvLb), which STEINER & AMARAL (1997) called C5
Stratiodrilus pugnaxi has a double pair of long, anal, conical, ventral lobes (AcvLb)
Summary
Histriobdella van Beneden, 1858, found on eggs of lobsters in Europe and in North America, Stratiodrilus Haswell, 1900, found in the branchial chamber of freshwater crayfishes in Australia, Madagascar and South America, and Dayus Steiner & Amaral, 1999, collected from the pleopods of a marine isopod in South Africa are the three genera of epizoic, ectocommensal polychaetes in Histriobdellidae. VILA & BAHAMONDE (1985) described two additional species of Stratiodrilus, S. aeglaphilus on A. laevis laevis (Latreille, 1818) and S. pugnaxi on Parastacus pugnax (Poepigg, 1835) from Chile and presented a key for the six species known to that date. Stratiodrilus arreliai described by AMARAL & MORGADO (1997), on Aegla perobae Hebling & Rodrigues, 1972, collected in the State of São Paulo was the first species described from Brazil. STEINER & AMARAL (1999) made the first revision of Histriobdellidae, proposing the genus Dayus to accomodate Stratiodrilus cirolanae described by FÜHR (1971), from South Africa and described two species of Stratiodrilus, S. robustus epizoic on Trichodactylus sp., from São Paulo and S. circensis on Aegla sp. A new species of Stratiodrilus has been found on two species of freshwater crayfish Parastacus brasiliensis and P. defossus in the State of Rio Grande do Sul, southern Brazil, which is described
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