Clausocalanus arcuicornis
Dana (1849)
Download a fact sheet for Clausocalanus arcuicornis (PDF 342KB)
Taxonomy
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Maxillopoda |
| Subclass | Copepoda |
| Order | Calanoida |
| Family | Clausocalanidae |
| Genus | Clausocalanus |
| Species | arcuicornis |
Size
- Female: 1.15 - 1.62 mm
- Male: 0.97 - 1.17 mm
Distinguishing characteristics
- Form of seminal receptacle
- Profile of genital somite straight in lateral view
- Prosome : Urosome ratio
- Shape of forehead and rostrum
Male
- Rostrum in lateral view knoblike and protruding ventrally
- Pereiopod 5 right, short, 3 segmented
- Pereiopod 5 left leg is longer than urosome, robust, with long, slender, straight setae distally
- Prosome urosome ratio 1.9¡ª2.51:1
- 2nd urosome somite as long as the following 2 somites together
Female
- Antennule as long or slightly longer than prosome
- Rostrum in lateral view is short, bifurcated, thick at base, usually straight or slightly curved and directed ventrally
- The 3rd segment of P5 as long as the preceding 2 segments together; segment 3 bifurcated, sometimes with tiny spinlues on inner and outer margins
- Prosome : Urosome ratio 2.65-3.22:1
- Urosome shorter than 4th legs
- Genital somite in lateral view straight, or slightly concave, in region of seminal receptacle
- Genital somite 1.5 times as long as urosome somite 3
- Caudal rami about as long as broad
Distribution
- Epipelagic
- Inshore coastal, coastal and oceanic
- Australian distribution includes Tasmania, North West Cape, New South Wales and Great Barrier Reef
- World distribution: widespread in tropical and subtropical waters of the Pacific, Indian and Atlantic Oceans
Ecology
- Tropical-subtropical, circumglobal
- Can be transported into temperate regions with warm currents
- Most abundant off New South Wales during April and May; 17 ¨C 19º sea surface temperatures
- Carries eggs in a single, fragile sac
- Herbivorous
References
- Bradford-Grieve, J. M., E. L. Markhaseva, et al. (1999). Copepoda. South Atlantic Zooplankton. D. Boltovskoy. Leiden, The Netherlands, Backhuys Publishers. 1: 869-1098.
- Conway, D. V. P., White, R.G., Hugues-Dit-Ciles, J., Gallienne, C.P. and Robins, D.B. (2003). Guide to the coastal and surface zooplankton of the south-western Indian Ocean, Marine Biological Association of the United Kingdom
- Dakin, W. J. and Colefax A., (1940). "The plankton of the Australian coastal waters off New South Wales Part I." Publications of the University of Sydney: 210.
- Frost B, Fleminger A (1968). A revision of the genus Clausocalanus (Copepoda: Calanoida) with remarks on distributional patterns in diagnostic characters. Bulletin of Scripps Institution of Oceanography 12:1-235
- 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
- Saiz & Calbert (1999)