| length:ht. ratio (1.25-1.39) : 1 | |
| length:ht. ratio (1.40-1.98) : 1 | |
| length:ht. ratio (2.00-2.60) : 1 | |
| length:ht. ratio (4.18-4.29) : 1 |
| medium length | |
| short | |
| very long |
| 1 present; seg 1 | |
| 2 present; segs 1 & 4 | |
| 3 present; segs 1; 2 & 4 | |
| 4 present; segs 1-4 | |
| not present |
| 1 pair of hepatic spines | |
| 1 pair of lateral denticles | |
| 1 pair of post-ocular spines | |
| 2 pairs of lateral denticles | |
| horiz; overlaps frontal plate | |
| none present |
| bilobed; cylindrical | |
| bilobed; pear-shaped | |
| bilobed; upper > lower lobe | |
| bilobed; upper < lower lobe | |
| bilobed; upper ~ lower lobe | |
| round or nearly round |
| large; (0.20-0.28) : 1.0 | |
| medium; (0.16-0.19) : 1.0 | |
| small; (0.12-0.15) : 1.0 | |
| very small; (0.02-0.10) : 1.0 |
| 1 on each eyestalk |
| Antarctic | |
| Arctic | |
| Eastern Boundary Currents | |
| Indian Ocean | |
| North Atlantic | |
| North Pacific | |
| South Atlantic | |
| South Pacific | |
| Sub-Antarctic | |
| Subarctic Atlantic | |
| Subarctic Pacific | |
| Tropical Atlantic | |
| Tropical Pacific | |
| Western Boundary Currents |
| bifid | |
| comb-shaped | |
| leaf-like and recurved | |
| lobe-like; hood-like | |
| lobe-like;extend to mid seg. 2 | |
| lobe-like;long spine on margin | |
| none; or small protuberance | |
| spine-shaped (pointed) |
| no palp(Pseudeuphausia sinica) | |
| with palp |
| 2 | |
| 3 | |
| 4-19 | |
| none |
| LP has pair tiny lateral teeth | |
| LP has small forked projection | |
| LP simple hook; length PP ~ TP | |
| LP simple hook; length PP/TP=6 |
| processes on inner lobe ~ = | |
| proximal process long | |
| small spine-shaped process | |
| terminal / prox. process ~1.1 | |
| terminal / prox. process ~1.5 | |
| very large median lobe |
| beyond front of the eye | |
| frontal plate truncated | |
| keeled; with a dorsal notch | |
| no rostrum;obtuse frontalplate | |
| short; about to eye mid-point | |
| slender; to front of eye | |
| upward directed tooth |
| 1-6 sim.; 7 w/o 3 distal segs. | |
| 1-6 sim.; 7 w/o 5 distal segs. | |
| 1-6 sim; 7-8 are rudiment | |
| 1-6 sim; f 6 has tiny end segs | |
| 1-7 sim.; 8 is rudiment | |
| 1-8 similar | |
| 2 elongate; distal seg setose | |
| 2 elongate; long distal spines | |
| 2;3 elongate; setose | |
| 3 elongate; bears false chela | |
| 3 elongate; bears true chela | |
| 3 elongate; long distal spines | |
| 3 with long styliform spine |
| 1 pair each; 2nd & 7th segs | |
| 1 pair on 7th seg |
| 16 ~ 40 mm | |
| 40 ~ 160 mm | |
| 6 ~ 8 mm | |
| 8 ~ 16 mm |
| no transverse suture near tip | |
| transverse suture near tip |
| 0 ~ 400 m | |
| 400 ~ 800 m | |
| Deeper than ~ 800 m |