Family incertae cedis * Author Bird, Graham J text Zootaxa 2007 1599 121 149 journal article 10.5281/zenodo.178710 6dfc7d0a-e2a3-46b0-bd4c-856e8f515f61 1175-5326 178710 Robustochelia robusta ( Kudinova-Pasternak, 1970 ) Leptognathia robusta Kudinova-Pasternak, 1970 : 365 –366, fig. 16. Kudinova-Pasternak, 1977 : 125 . Tanaissus robustus : Kudinova-Pasternak, 1975 : 223 . Robustochelia robusta : Kudinova-Pasternak, 1983 : 1171 . JóŸwiak & B³a¿ewicz-Paszkowycz, 2007: 27–31, figs 4–6. Remarks. The genus Robustochelia was placed in the subfamily Akanthophoreinae by Sieg (1986a) but was subsequently removed to the incertae cedis category by Larsen & Wilson (2002) . A generic diagnosis was also given by Larsen (2005) , with four known species. A very recent paper by Jóżwiak, & BłaŻewicz-Paszkowyc (2007) has updated the taxonomy, redescribed the type species R. robusta , added a further new species and removed R. solida Larsen (2005) from the genus. The cheliped and pereopod morphology, and shape of the mandibular molar (and other mouthparts) suggest a close relationship with Leptognathioides (see above) and Monstrotanais Kudinova-Pasternak. The species Robustochelia robusta was originally described from material collected from the Kurile- Kamchatka Trench at 4945–5240 metres ( Kudinova-Pasternak 1970 ), but has not been recorded in the present study. It is also reported from the more southerly Izu-Ogasawara Trench, 6770–6850m ( Kudinova-Pasternak 1977 ) and doubtfully from the south Atlantic, at 2600 metres ( Kudinova-Pasternak 1975 ).