Acartia (Acartia) negligens
Dana (1849)
Download a fact sheet for Acartia (Acartia) negligens (PDF 575KB)
Taxonomy
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Maxillopoda |
| Subclass | Copepoda |
| Order | Calanoida |
| Family | Acartiidae |
| Genus | Acartia (Acartia) |
| Species | negligens |
Size
- Female: 1.04 – 1.27 mm
- Male: 0.8 - 1.02 mm
Distinguishing characteristics
- Form of P5
- Female with small spine on end of prosome
- Male urosome hairy and with spinules
Male
- A1 shorter than body
- Posterior prosome rounded with setae
- The first 2 urosome somites hairy laterally, somites 2, 3, 4 and anal somite all with tiny spinules
- Right P5 basipod 2 with rounded projection on internal border
- Left P5 exopod 2 with 3 terminal spines and a plumose spine at mid length
Female
- A1 reaches to caudal rami, segment 1 with a small, slender spine
- Posterior corner of prosome with one or many very small spines and a range of dorsal fine hairs
- Outer distal plumose seta on P5, 5 times longer than terminal spine like segment which has coarse spinules for short distance at about mid length
- Basis of P5 longer than wide, inner spine dentate
- The first two segments of urosome with dorsal spinule on posterior border
Distribution
- One of two species of Acartia to primarily inhabit open ocean waters
- Epipelagic, mesopelagic
- Cosmopolitan
- Restricted to between latitudes 40oS and 40oN
Ecology
- Eggs released into water
- Omnivorous
- Indicator species of Kuroshio Current in winter when NE monsoon prevails
References
- Bradford-Grieve, J. M., (1999) The marine fauna of New Zealand: pelagic calanoid copepoda: Bathypontiidae, Arietellidae, Augaptilidae, Heterorhabdidae, Lucicutiidae, Metridinidae, Phyllopodidae, Centropagidae, Pseudodiaptomidae, Temoridae, Candaciidae, Pontellidae, Sulcanidae, Acartiidae, Tortanidae. National Institute of Water and Atmospheric Research, Wellington, New Zealand.
- Greenwood, J. G. (1978). "Calanoid copepods of Moreton Bay (Queensland) 3. Families Temoridae to Tortanidae, excluding Pontellidae." Proceedings of the Royal Society of Queensland 89: 1-21.
- Hsioa, S. H., Ka, S., Fang, T. H. & Hwang, J. S. 2011. Zooplankton assemblages as indicators of seasonal changes in water masses in the boundary waters between the East China Sea and the Taiwan Strait. Hydrobiologia, 666, 317-330.
- Mauchline (1998). The biology of calanoid copepods. Advances in Marine Biology Volume:33, Pages: i-x, 1-701.
- Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2009. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Available at http://copepodes.obs-banyuls.fr/en