Isopod Crustacea. Pt. II: The Suborder Valvifera. Families: Idotheidae, Pseudidotheidae and Xenarcturidae fam. n. with a supplement to Isopod Crustacea, Part I. The Family Serolidae

This is the authors' abstract. We don't add key points for this paper.

THIS paper deals with the Valvifera collected during the years 1925-36 by the Discovery Investigations, with the exception of the family Astacillidae (Arcturidae).The suborder Valvifera, according to Barnard's (1920, p. 381) analytical key of the principal families, includes the Idoteidae, Pseudidotheidae, Amesopodidae and Astacillidae.Nordenstam (1933, p. 93) pointed out that Barnard did not mention the two families Chaetiliidae and Holognathidae, the former proposed by Dana (1852) to contain his species Chaetilia ovata, the latter proposed by Thomson (1904) for his species Holognathiis stewarti (Filhol).Nordenstam suggested that these two species should be included in the family Idoteidae, the former in his new subfamily Macrochiridotheinae, the latter in the subfamily Idoteinae.To the families included in this suborder must now be added the new family Xenarcturidae, formed to contain the new genus Xenarcturus from the Discovery collections.In the classification of the Valvifera which follows, only those genera have been included to which reference is made in this report: Suborder