Calanoides acutus
Calanoides acutus is a copepod found in Antarctica and the surrounding waters. Description. The female ranges from about , and the male has an average length of about . Distribution. "C. acutus" is found in Antarctic and sub-Antarctic waters, from sea level to in depth. Ecology. Life history and reproduction. While "C. acutus" is only confirmed to breed from November to March, it likely starts breeding in early October, as a study observed females without eggs and late-stage nauplii presumably belonging to this copepod in mid-November. Stage I through III copepodites are generally found from sea level  to of depth. Older stages, on the other hand, are found in the top during the summer, except during December, when they are found in the top . "C. acutus" starts to descend in February, although this is affected by the food supply, with individuals in the northern portion of the range, like in Drake Passage, only starting to winter during mid-March. Individuals, mainly stage IV and V copepodites, winter to between about . There is no evidence of diel vertical migration in this species.