A review of the genus Satonius (Coleoptera: Myxophaga: Torridincolidae): taxonomic revision, larval morphology, notes on wing polymorphism, and phylogenetic implications
Hájek Jiří, Fikáček Martin
Acta Entomologica Musei Nationalis Pragae 48(2): 655-676, 2008
Views: 1250
Abstract: The genus Satonius Endrödy-Younga, 1997, is revised. Three new spe- cies are
described from China: Satonius schoenmanni sp. nov. (Hunan province), S. stysi
sp. nov. (Yunnan province), and S. wangi sp. nov. (Zhejiang province). Two
additional new species from the Chinese provinces Fujian and Anhui are left
undescribed pending the collection of complete specimens and males, respecti-
vely. Metathoracic wing venation of S. stysi sp. nov. is shown to differ from
the remaining Myxophaga in the presence of the bifurcation of AA3+4, which
updates the venation groundplan of the suborder. Anterolateral spine-like
projection of the metaventrite and the increased number of apical setae on
parameres are defined as adult autapomorphies of the genus. Larvae of S. stysi
sp. nov. are described and compared with the larvae of the Japanese S. kurosawai
(Satô, 1982). Characters shared by larval Satonius and Ytu Reichardt, 1973
(extremely flattened body covering legs, and modified orientation and unusual
morphology of legs) are supposed as parallel adaptations for the larval
environment – very thin film of water in seepage habitats. Interspecific wing
polymorphism of Satonius is briefly discussed and possible reasons of the wide
distribution of the apterous S. kuro- sawai are hypothesized.
Key words: Coleoptera, Myxophaga, Torridincolidae, Satonius, Ytu, new species, larva, Oriental region, Palaearctic region, China, Japan, wing venation, phylogeny, hygropetric habitats.