Primno, Guerin-Meneville, 1836

Zeidler, Wolfgang, 2004, A review of the families and genera of the hyperiidean amphipod superfamily Phronimoidea Bowman & Gruner, 1973 (Crustacea: Amphipoda: Hyperiidea), Zootaxa 567, pp. 1-66 : 21-22

Key to the species of the genus Primno

1. Pereopod 5; longer teeth on anterior margin of carpus nearly as long as width of carpus ....................................................................................................................................... 2

­ Pereopod 5; length of longer teeth on anterior margin of carpus about 0.3–0.5 x width of carpus ........................................................................................................................ 5

2. Pereopod 5; row of teeth on anterior margin of carpus with short tooth proximally .... 3

­ Pereopod 5; row of teeth on anterior margin of carpus with one of the longer teeth proximally .................................................................................................................... 4

3. Distribution restricted to southern hemisphere; subantarctic province. Rostrum conforming to contour of head, about 0.4x width of head .................................................... ............................................................................... P. macropa Guérin­Méneville, 1836

­ Distribution restricted to North Pacific; subarctic province. Rostrum truncate, limited to space between first antennae P. abyssalis (Bowman, 1968)

4. Pereopod 7; basis length about 1.2 x length of remaining articles combined................. .............................................................................................. P. johnsoni Bowman, 1978

­ Pereopod 7; basis length more than 1.5x length of remaining articles combined .......... .............................................................................................. P. latreillei Stebbing, 1888

5. Pereopod 5; length of longer teeth on anterior margin on carpus about 0.3x width of carpus. Pleon subequal in length to pereon ........................ P. brevidens Bowman, 1978

­ Pereopod 5; length of longer teeth on anterior margin of carpus about 0.5x width of carpus. Pleon length about 1.4x length of pereon .................... P. evansi Sheader, 1986