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The female -can readily be recognised by the long naked claw-like spine on the fifth 
pair of feet. 
This species was first recorded from the Red Sea, but it has since been obtained from 
various parts of the Indian Ocean. 
3. Acartia neghigens Dana. 
Acartia negligens Dana, 1849, p. 26. 
Acartia negligens Giesbrecht, 1893, p. 508, pls. 30 & 43. 
Acartia negligens Giesbrecht & Schmeil, 1898, p. 154. 
| Acartia negligens Cleve, 1901, p. 4. 
Acartia negligens A. Scott, 1902, p. 408. 
Acartia neghgens Thompson & Scott, 1903, p. 254. 
Acartia negligens Cleve, 1903, p. 355. 
Acartia negligens Wolfenden, 1905 (a), p. 1023, 
Acartia negligens Sars, 1907(a), p. 27. 
The spine on the fifth pair of feet of the female of this species is somewhat similar to 
that on the fifth pair of Acartza danae. The two forms can readily be separated, however, by 
the form of the last thoracic segment. In the present species the posterior margins of the last. 
thoracic segment are rounded and the distal ends are each furnished with a very small spine. 
The last thoracic segment of Acartza danae is produced on each side into a strong spine. 
Acartia negligens appeared to have a fairly wide distribution in the area traversed by 
the ‘Siboga’. It was found at the following stations. 
Stat. 36. — Stat. 40. — Stat. 47°. — Stat. 71. — Stat. 96 (day). — Stat. 110. — Stat. 125 (day). — 
Stat. 128 (HENSEN vertical net, 700 metres to surface). — Stat. 133. — Stat. 138. — 
Stat. 141 (HENSEN vertical net, 1500 metres to surface). — Stat. 142. — Stat. 148 (HENSEN 
vertical net, 1000 metres to surface). — Stat. 165. — Stat. 168. — Stat. 174. — Stat. 185 
(HENSEN vertical net, 1536 metres to surface). — Stat. 203 (HENSEN vertical net, 1500 
metres to surface). — Stat. 205. — Stat. 213. — Stat. 217 (horizontal cylinder). — Stat. 
Stat. 245. — Stat. 252. — Stat. 276 (HENSEN vertical net, 750 metres to surface). — 
Stat. 282. — Stat. 304. 
This Acarta has been recorded from the Mediterranean, Arabian and Red Seas, Indian 
and Pacific Oceans, and from the Malay Archipelago. 
4. Acartia spinicauda Giesbrecht. 
Acartia spintcauda Giesbrecht, 1889, p. 25. 
Acartia spinicauda Giesbrecht, 1893, p. 508, pls. 30 & 43. 
Acartia spinicauda Giesbrecht & Schmeil, 1898, p. 155. 
Acartia spinicauda Cleve, 1901, p. 4. 
Acartia spinicauda Cleve, 1903, p. 355. 
This Acartia resembles Acartia centrura in general appearance, but it can readily be 
separated by the form of the spine on the fifth pair of feet of the female. The spine is long 
and slender. It appears to be articulated to a short stout basal part attached to the end of 
the free joint. 
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