Oplophoroidea, Dana, 1852

Lunina, Anastasiia, Kulagin, Dmitry & Vereshchaka, Alexander, 2024, The taxonomic status of Hymenodora (Crustacea: Oplophoroidea): morphological and molecular analyses suggest a new family and an undescribed diversity deep in the sea, Zoological Journal of the Linnean Society (Zool. J. Linn. Soc.) 200 (2), pp. 336-351 : 348

Key to families of Oplophoroidea

1. Second maxilla with elongate proximal endite lacking submarginal papilla and lamina ( Fig. 7C ); first maxilliped with two-segmented endopod at least two times as long as distal endite ( Fig. 7D ).......................................... Hymenodoridae fam. nov.

- Second maxilla with proximal endite bearing papilla and submarginal lamina ( Fig. 7G, H, L, M ); first maxilliped with three-segmented endopod (if two-segmented then as long as distal endite) ( Fig. 7I, N )..........................................................................2

2. Second maxilliped with distal segment subtriangular and attached diagonally to preceding segment ( Fig. 7O ) ............................................................................................................................................................ Acanthephyridae Spence Bate, 1888

- Second maxilliped with distal segment suboval and attached almost transversely to preceding joint ( Fig. 7J ) ........................... .............................................................................................................................................................................. Oplophoridae Dana, 1852

Figures

Figure 7. Morphological characters distinguishing three families of Oplophoroidea.A–E, Hymenodoridae (Hymenodora frontalis, St. 7497 d271) mandibles (A), second maxilla (B), proximal endite of second maxilla (C), first maxilliped (D) and second maxilliped (E). F–J, Oplophoridae (Systellaspis debilis, 179RT 23.1) mandibles (F), second maxilla (G), proximal endite of second maxilla (H), first maxilliped (I) and second maxilliped (J). K–O, Acanthephyridae (Acanthephyra quadrispinosa Kemp, 1939, AMK87 7277-D13) mandibles (K), second maxilla (L), proximal endite of second maxilla (M), first maxilliped (N) and second maxilliped (O). All scale bars:1 mm.