Volume 83, 1955-56
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Key to New Zealand Species of Scina
| 1. Peraeopod 5 much more than ½ length of peraeopod 4; basos of peraeopod 3 about ⅔ total length of following segments, basos anterior margin smooth or very finely denticulated; antenna 1 as long as body | Scina crassicornis (Fabr.), 1775. |
| Peraeopod 5 less than ¼ length peraeopod 4; basos of peraeopod 3 with both anterior and posterior margins strongly toothed | 2 |
| 2. Peraeopod 3, basos about ½ total length of following segments, anterodistal angle produced to small spine, shorter than and not reaching far along ischium; uropod 1 inner ramus (peduncle) with strong teeth on inner margin; antenna 1 half length of body | Scina borealis (G. O. Sars), 1882. |
| Peraeopod 3, basos about ⅔ total length of following segments, anterodistal angle produced to strong spine much longer than and reaching well past ischium; uropod 1 inner ramus with a few small spines on inner margin; antenna 1 about ⅔ body length | Scina curiidactyla Chevreux, 1914 |