查看更多>>摘要：The genus Olivancillaria is revised and restricted to eight living species: O. deshayesiana, 0. carcellesi, 0. urceus, 0. contortuplicata, 0. orbignyi, O. teaguei, 0. auricularia and O. vesica. The last two species were previously considered as subspecies. The name O. uretai is a junior synonym of O. orbignyi. The genus Olivancillaria is endemic to the southwestern Atlantic, ranging from Bahia state, Brazil (-12°S) to Chubut province (42°37'S), Argentina, intertidal to 70 m depth. It is a clear representative of the Argentine Malacological province. Redescriptions and re-illustration of types were done for each species. Shell ultrastructure, radulae, penes, siphon papillae and egg capsules are described and illustrated by SEM images. A geometric morphometric analysis was carried out to confirm shell variation on size and shape among species. The geographic distribution of each species is provided based on field observations as well as on museum records.
查看更多>>摘要：A new species of Labuanium Serene & Soh, 1970, L. vitatum is described from northeastern Indian Ocean. It belongs to the L. rotundatum species-group, but is most closely related to L. scandem Ng & Liu, 2003, and L. papuomalesiacum (No-bili, 1899), thelatter being here formally removed from synonymy with L. rotundatum (Hess, 1865) and raised to full species status. The new species differs from congeners by numerous characters including the structure of the male first pleopod, carapace and third maxillipeds, and by differences in proportions of the male abdominal somites.
查看更多>>摘要：Two new species, Byrathis divae sp. nov. and B. penicillatus sp. nov., are described from females collected in the deep waters and at abyssal depths above the sea bed, and are the first representatives of the genus recorded from the South Atlantic. Species of Byrathis Markhaseva & Ferrari, 2005 are divided into 2 groups. The first group, which includes both new species, contains medium sized copepods (from 2.1 to 4.9 mm) with a nude genital double somite, maxillule proximal basal endjte with 3 setae,maxillule exopod with 6 or more setae, and maxilla endopod with 3 worm-like and 5 brush-like sensory setae. The second group contains small species (less than 1.4 mm) that share the surface ornamentation of the genital double somite, maxillule proximalbasal endite with 2 setae, maxillule exopod with 5 setae or less, and maxilla endopod with 5 worm-like plus 3 brush-like sensory setae. For the first time an adult Byrathis male is described after Byrathis arnei Schulz, 2006 from the Southern Ocean. Among males of Clausocalanoidea that possess sensory setae on maxilla and maxilliped, the Byrathis male is well defined by symmetric antennules (ancestral segments XXII-XXIII fused on both sides) and poorly expressed P5 coxa and basis asymmetry, with both exopods 3-segmented and the right leg uniramous.
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