Bilton David T
1School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK. .
Zootaxa. 2023 Mar 14;5254(4):593-600. doi: 10.11646/zootaxa.5254.4.11.
Hydraena saotometerrestris sp. nov. and H. turneri sp. nov. are described from São Tomé island in the Gulf of Guinea. Both species belong to the subgenus Hydraenopsis Janssens, 1972 and were collected from primary forest locations; H. turneri sp. nov. found living aquatically in a small seepage over rock and clay. In contrast, H. saotometerrestris sp. nov. was collected from damp forest litter, far from water, in two mountainous locations on São Tomé and is apparently terrestrial. The overall habitus and similar form of aedeagus in the new species strongly suggest they are closely related, pointing to apparent adaptive radiation following a single colonization of this oceanic island.
几内亚湾圣多美岛发现了新物种圣多美水缨甲（Hydraena saotometerrestris sp. nov.）和特纳氏水缨甲（H. turneri sp. nov.）。这两个物种都属于水缨甲亚属（Hydraenopsis Janssens，1972），均采集自原始森林地区；特纳氏水缨甲新物种生活在岩石和黏土上的一小片渗流水中。相比之下，圣多美水缨甲新物种是在圣多美两个山区远离水源的潮湿森林落叶层中采集到的，显然是陆生的。新物种的整体形态和相似的阳茎形态强烈表明它们亲缘关系密切，这表明在该海洋岛屿单次定殖后出现了明显的适应性辐射。
