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Thalassodes linguissita sp. n.  

Thalassodes linguissita

14-18mm. The white fasciae are strong, but rather irregular and broken. Marginal markings are strong on the hindwing. This is another member of the dissita group. The saccular setose process is twice as large as in the other two, and the scobinate spine is very large, asymmetrically tongue-like, extending dorsally and then flexed out parallel to the valve costa. A related species occurs in Sulawesi (slide 8453) and Seram (slide 12521) with an even larger scobinate, tongue-like spine that extends to the small digitate process at the centre of the valve costa. The saccular process is intermediate in size between that of dissitoides and that of linguissita.

Holotype  E. SABAH: Brumas, 500ft 26.4.1973 (K.M. Guichard), BM geometrid slide 16749.

Paratypes 3 (slide 10722, 10719) SARAWAK: Gunung Mulu Nat. Park, R.G.S Exped. 1977-8 (J.D. Holloway et al.) Sites 18, 23, 28; 1 BRUNEI: 1000m, Lower Temburong, lowland forest, 20.5.79 (Lt. Col. M.G. Allen) slide 16750.

Putative females of dissitoides and linguissita have not been satisfactorily separated, but those identified by slide numbers 10709, 10710, 10716, 10721 and 10724 have genitalia similar to those of the holotype of dissita. Female 10721 has the lamella vaginalis more sclerotised as in the Sulawesi/Seram species (slide 8469) and is tentatively assigned to linguissita, with the rest assigned to dissitoides.

Geographical range. Borneo, Sumatra (slide 8699).

Habitat preference. This is a rare species of lowland forest. Its close relative in Sulawesi and Seram shows some affinity for disturbed and secondary forest.

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