Clausocalanus jobei
Frost & Fleminger (1968)
Download a fact sheet for Clausocalanus jobei (PDF 308KB)
Taxonomy
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Maxillopoda |
| Subclass | Copepoda |
| Order | Calanoida |
| Family | Clausocalanidae |
| Genus | Clausocalanus |
| Species | jobei |
Size
- Female: 1.01 - 1.56 mm
- Male: 0.87 - 1.07 mm
Distinguishing characteristics
- Form of seminal receptacle
- Shape of forehead and rostrum
- Prosome : Urosome ratio
- Female C. jobei is distinct from all other Clausocalanus spp. (except C. farrani) in having a ventral protuberance of the genital somite anterior to genital pores
- C. jobei and C. farrani differ in form of rostrum in lateral view
Male
- Rostrum knoblike and protrudes ventrally
- Prosome:Urosome ratio 2.29-2.60:1
- Longer ramus of pereiopod 5 on left side, left pereiopod 5 longer than urosome, left pereiopod 5 armed distally with 2 thick curved spiniform setae
- Right pereiopod 5 short, 2 segmented, 2nd segment very small
Female
- Rostrum long, slender and curved in lateral view
- Posterior margin of female prosome rounded in lateral view
- Prosome:Urosome ratio 2.32-2.92:1
- Genital somite more than 1.5 times as long as urosome somite 3
- There is a ventral protuberance of the genital somite anterior to genital pores
Distribution
- Tropical or sub-tropical distribution, circumglobal
- Broadly neritic distribution throughout its range
- Distribution distinct from C. farrani in the Indian & Pacific Oceans, areas of slight overlap found in western part of the eastern tropical Pacific Ocean
Ecology
- Carries eggs in a single, fragile sac
- Herbivorous filter feeder
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.
- 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
- Saiz and Calbert, (1999)
- Taw, N. (1978). "Some common components of the plankton of the southeastern coastal waters of Tasmania." Papers and proceedings of the Royal Society of Tasmania 112: 69-136.