查看更多>>摘要：Two new genera, Gahniacarus gen. nov. and Cyperacarus gen. nov., and four new species, G. gersonus sp. nov., G. tuberculatus sp. nov., C. naomae sp. nov. and C. foliatus sp. nov., are described from native Australian sedge species in the genus Gahnia(Cyperaceae). Leg chaetotaxy is provided for all stages of each species. The importance of taxonomic characters offered by immature stages and ontogenetic changes in leg chaetotaxy are discussed. A key to the Tenuipalpidae associated with Cyperaceae in Australia is provided.
查看更多>>摘要：Pseudolithoxus kelsorum is described as a new species based on type material from the upper Orinoco in Amazonas State, Venezuela. Pseudolithoxus kelsorum is diagnosed from all other Pseudolithoxus by having dark brown to black base color with eight to11 (usually nine) light yellow vertical or oblique transversal bands between orbits and caudal fin, bands wide and rarely but sometimes incomplete or contorted as swirls (vs. dark brown to black base color with 18 or more thin, light yellow, frequentlycontorted transversal bands between orbits and caudal fin in P. tigris; black base color with small white spots in P. anthrax and P. nicoi; and light brown base color with dark brown to black spots in P. dumus). Distributions of P. kelsorum and other Ancistrini taxa support the presence of a zoogeographic filter limiting fish distributions across a reach of the Orinoco River between the Ventuari-Orinoco confluence and the Maipures rapids.
查看更多>>摘要：The Thyropygus induratus subgroup of the T. allevatus group is revised. Three new species are described from Thailand: T. dormiens n. sp., T. laterolobatus n. sp. and T. macrosiamensis n. sp. The following species are redescribed and re-elevated fromsubspecies status under T. allevatus (Karsch, 1881): Thyropygus induratus Attems, 1936 (= T. punctatus At-tems, 1938, new synonym), Thyropygus quietus Attems, 1938, Thyropygus resimus Attems, 1938, and Thyropygus uncinatus (Demange, 1961). Thyropygus siamensis Verhoeff, 1938 (= Thyropisthus ligulus Demange, 1961, new synonym), is re-described. A case of species with identical gonopods but very different body size (T. induratus and T. quietus) is discussed.
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