The integumental pore signature of Thermocyclops oblongatus (sars. 1927) and thermocyclops neglectus (sars, 1909), with the description of thermocyclops africae new species, and a comparison with thermocyclops emini (mrazek, 1895)

摘要

The integumental pore pattern of adult females of Thermocyclops oblongatus (Sars, 1927), Thermocyclops africae sp. n. nd of adult females and males of Thermocyclops neglectus (Sars. 1909), is ampped. A full redescription based on classical methods and on a study of the integumental perforations of the two species is done and, following the same methodology, Thermocyclops africae sp. n. is described. Their pore signatures are compared with that of T. emini.As in the latter, performations of the three species are bilaterally symmetrical. For the four species, the number and distribution of performations are similarly conserved on the rostrum, on the proximal zone of the dorsal side of the genital somite and on the anal somite and furcal rami in females. In contrast, we recorded differences in number and distribution of the perforations on the cephalosome, metasome and urosomal somites. There were also differences between conspecific males and females; their number and disribution of perforations were identical only on the anal somite. The total number of integumetal perforations varied from 220 to 222 in T.oblongatus, 190 to 193 in Thermocyclops africae sp. n., 162 to 164 and 112 to 115 in females and males of T.neglectus, respectively. Each of the four species is therefore uniquely characterised by its pore patrern.