On some amphipod species of the genusHaploops, with special reference toH. Tubicolaliljeborg andH. tenuissp. nov. from the Øresund

Publisher Website
Google Scholar
Abstract
Haploops tubicola Liljeborg is in part refigured and redescribed on new material from Liljeborg's type locality - the northern part of the Øresund; the drawings by G. O. Sars (1895) are not in accordance with the present material. A new species Haploops tenuis n. sp., is found to cohabit with the former species in the Haploops community. Although rather similar, the two species differ in external morphology, in number and size of eggs, in adult size, in parasite infestation, and in number of hepato-pancreatic caeca. Haploops spinosa Shoemaker, partly established because Shoemaker's specimens differed from Sars' illustrations of H. tubicola, is accordingly reconsidered and the two species are found to be synonymous. Haploops laevis Hoek, as treated in recent literature, is revised with reference to the description by Stebbing (1893–1904); additional information from freshly collected specimens from West Greenland is given, and the distribution is revised since specimens found in this area have been confused with H. tubicola, H. setosa Boeck is treated on museum material and the literature. The synonymy of H. robusta G. O. Sars with H. setosa is confirmed as Sars species is found to be based on young males of H. setosa with abnormally developed antennae. H. similis Stephensen is re-examined. Some specimens collected in the same area as H. similis, and which were determined as H. tubicola by Stephensen, were restudied and found not to belong to this species; it is most probable that they belong to an undescribed species closely related to H. similis.