Fagegnathophausia gracilis ( Willemoes-Suhm, 1875 )

Yolanda, Rofiza, Lheknim, Vachira, Price, W. Wayne & Hendrickx, Michel E., 2023, The lophogastrids (Crustacea: Peracarida: Lophogastrida) of Indonesia and its adjacent waters. An updated checklist, Zootaxa 5330 (3), pp. 413-429 : 416

Fagegnathophausia gracilis ( Willemoes-Suhm, 1875)

Junior synonyms. Gnathophausia gracilis var. brevispinis — Wood-Mason & Alcock, 1891. Gnathophausia brevispinis Wood-Mason & Alcock, 1891 .

Gnathophausia dentata Faxon, 1893 .

Gnathophausia bidentata Illig, 1906 .

Records from Indonesia. Between West Sumatra and Siberut Island ( Illig 1930), Seram Sea, Celebes Sea ( Fage 1941), West of Sumatra Island ( Taniguchi 1974) and Makassar Strait ( Băcescu 1991). Depth range: 746–4940 m.

Remarks. Previously, this species was included in the genus Gnathophausia , but based on morphological and molecular evidence, a new genus, Fagegnathopausia, was erected to accommodate this species ( Petryashov 2015). The genus Fagegnathophausia differs from the other two genera in Gnathophausiidae by a sharply serrated median dorsal keel of carapace, presence of a dorsal spiniferous ridge by the rostrum base, longer basal segment of maxillula endopod, which is three times as long as distal segment, wider oval distal segment of the maxillula endopod, presence of large spatulate exopod on maxilliped, differentiated pereopodal dactyli, which are coneshaped on pereopods 2–3 and stylet-shaped on pereopods 4–8, presence of spines on the inner margin of uropodal sympodite and crown shaped apex of telson ( Petryashov 2015).