Vemana (J. L. Barnard, 1964)

Ortiz, M. & Winfield, I., 2022, A new deep-sea species of Vemana J. L. Barnard, 1964 (Amphipoda, Amphilochidea, Vemanidae) from off southern Gulf of Mexico, Zootaxa 5205 (6), pp. 585-593 : 592

Identification Key to the species of genus Vemana in the deep sea worldwide

1A- Third pleonal epimeron rounded at lower posterior corner; lower lip asymmetrical (Caribbean Sea, 1826 m in depth)................................................................................................. V. compresa

1B- Third pleonal epimeron never rounded at lower posterior corner; lower lip symmetrical............................. 2

2A- Antenna 1first article of main flagellun with short calynophores................................................ 3

2B- Antenna 1first article of main flagellun with long calynophores................................................ 4

3A- Basis posterior margin of pereopod 7 basal half convex; distal half concave; urosomal segment 1 dorsally with hump (Cedros Trench, Baja California, 3705-3745 m in depth).................................................... V. lemuresa

3B- Basis posterior margin of pereopod 7 almost ovoidal; urosomal segment 1 dorsally without hump (Banc du Geyser, Mozambique Channel, Madagascar, 2500 m in depth)........................................................ V. geyserensis

4A- Coxa 4 posteroventral corner rounded; basis posterior margin of pereopod 7 devoid of teeth (Caribbean Sea, 4077 m in depth)............................................................................................. V. lizata

4B- Coxa 4 posteroventral corner very acute, forming a projection; basis posterior margin of pereopod 7 with six teeth (SW Gulf of Mexico, 1492 m in depth)................................................................ V. touzeti sp. nov.