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Swimming legs armature formula. Roman numerals indicate spines, Arabic numerals represent setae. Differences in spine count are marked in bold. (a) S. ivlevi and S. tenuis, (b) S. humesi.
| Leg | Coxa | Basis | Exopod | Endopod |
|---|---|---|---|---|
| P1 | 0–0 | 1–I | I-0; I-1; III,I,4 | 0–1; 0–1; 0,I,5 |
| P2 | 0–0 | 1–0 | I-0; I-1; III(a)/II(b),I,5 | 0–1; 0–2; 0,II,3 |
| P3 | 0–0 | 1–0 | I-0; I-1; II,I,5 | 0–1; 0–2; I,II,2 |
| P4 | 0–0 | 1–0 | I-0; I-1; II,I,5 | 0–1; 0–2; I,II,1 |
