Tanaidacea (Crustacea: Peracarida) of the North-east Atlantic: the genera Leptognathioides and Portaratrum of the ‘ Atlantic Margin’ Author Bird, Graham J. text Journal of Natural History 2014 2014-04-23 48 29 - 30 1771 1815 http://dx.doi.org/10.1080/00222933.2014.896489 journal article 10.1080/00222933.2014.896489 1464-5262 5193971 Leptognathioides Bird and Holdich, 1984 Leptognathia : Hansen (1913) : 96 , in part: Leptognathia group c, subdivision γ Leptognathioides: Bird and Holdich (1984) : 287 –288 Leptognathioides Bird and Holdich (1984) ; Sieg 1986: 162–163 Diagnosis (see Bird and Holdich 1984 ) Additions/corrections: antenna six-articled; article-4 with pseudo-suture (‘fusion line’). Mandible molar spines in coronal array. Cheliped palm inferior and superior margins parallel. Pereopods 1–3 basis with superior seta. Preparatory males with four-articled antennule thicker than in female. Swimming male unknown. Composition Leptognathioides biarticulata n. sp. ; L. polita ( Hansen 1913 ) ; L. potens Bird and Holdich, 1984 ; L. rectus Kudinova-Pasternak, 1993 ; L. vicinus ( Hansen 1913 ) Remarks The addition to the diagnosis corrects a mistake in the original where it was stated ‘antennule [ sic ] 7-articled’. This should have referred to the antenna, which has a distinct pseudo-suture/fusion line on article-4, as seen in several colletteid genera ( inter alia ). Apart from the listed species, an undescribed species of Leptognathioides has been recorded from one of the Japanese trenches ( Bird 2007 ), as ‘ Leptognathioides sp. KK#1’. The familial status of the genus remains equivocal until a detailed phylogenetic or genetic analysis is performed, but it will probably be the same as that of Portaratrum .