Trilacuna Tong & Li, 2007

Tong, Yanfeng, Chen, Haifeng, Bai, Shuchong, Zhang, Zhisheng & Li, Shuqiang, 2019, Seven new species of the genus Trilacuna Tong & Li, 2007 from Yunnan, China (Araneae, Oonopidae), ZooKeys 821, pp. 11-44 : 13

Genus Trilacuna Tong & Li, 2007

Trilacuna Tong & Li, 2007: 333; Grismado et al. 2014: 26.

Type species.

Trilacuna rastrum Tong & Li, 2007.

Comments.

This genus was originally diagnosed by the enlarged male palpal femora, the very complicated embolus-conductor complex, the branched endites in males, and the notched labium ( Tong and Li 2007). These characters were later recognized as shared by a more inclusive group, the " Dysderoides complex", including Bannana Tong & Li, 2015, Dysderoides Fage, 1946, Himalayana Grismado, 2014, and Trilacuna ( Grismado et al. 2014; Tong and Li 2015). The genus Bannana is distributed only in Xishuangbanna, Yunnan Province, China; Dysderoides species were known from caves from northern India and Thailand; species of Himalayana were known only in Nepal and northern India; while those of Trilacuna have a wider distribution from Iran to the Korean Peninsula.

The genus Trilacuna can be distinguished from the other genera of the Dysderoides complex by the females having a long postepigastric scutum, covering almost the whole ventral abdomen (Fig. 3G), and males usually lacking the furrow connecting the posterior tracheal spiracles (Fig. 1H). The females of the other genera of the Dysderoides complex, Bannana , Dysderoides , and Himalayana have a very short postepigastric scutum, only around the epigastric furrow ( Grismado et al. 2014: fig. 12E, 69H; Tong and Li 2015: fig. 5G), and males have the furrow connecting the posterior tracheal spiracles ( Grismado et al. 2014: fig. 59D; Tong and Li 2015: fig. 1G).

Composition.

29 species, 7 of them are described here.

Distribution.

Iran to Korean Peninsula.