Thylakogaster Wilson and Hessler, 1974

Brenke, Nils & Buschmann, Anika, 2009, Thylakogaster namibiensis sp. nov. (Isopoda: Asellota: Janiroidea), a new species of Haplomunnidae from the southeast Atlantic deep sea *, Zootaxa 2096 (1), pp. 381-394 : 383

Thylakogaster Wilson and Hessler, 1974

Synonymy: Thylakogaster Wilson and Hessler 1974: 48 ; Kussakin, 1988: 356; Cunha and Wilson, 2003: 10

Type species: Thylakogaster peterpauli Wilson and Hessler, 1974

Composition: T. lobotourus Wilson and Hessler, 1974 ; T. majusculus Wilson and Hessler, 1974 ; T. peterpauli Wilson and Hessler, 1974 ; Thylakogaster namibiensis sp. nov.

Diagnosis (modified from Wilson & Hessler 1974). Body dorsoventrally flat and convex, except pleotelson. Cephalon without rostrum. Pereonite 3 widest. Pleotelson spherical and reflext anteriorly, lying dorsally on the pereon. Pereopod 1 shortest, subchelate, robust. Pereopods 2–7 long and slender walking legs. Uropods uniramous.

The following characters are added to the genus definition: Coxa of pereopod 1 fused with pereonite 1. Dorsolateral margins of all 7 pereonites with cuticular spines. Spines also developed on the coxae of all pereopods.

Remarks. During investigation of the different descriptions, figures and specimens of Thylakogaster species we noticed, that the additional characters above were not included in the family or genus diagnosis. The Coxa of pereopod 1 is not fused and the spines are also not developed in all genera of the Haplomunnidae . Therefore it seems to be necessary to add these characters to the genus diagnosis.