Clausocalanus pergens
Farran (1926)
Download a fact sheet for Clausocalanus pergens (PDF 343KB)
Taxonomy
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Maxillopoda |
| Subclass | Copepoda |
| Order | Calanoida |
| Family | Clausocalanidae |
| Genus | Clausocalanus |
| Species | pergens |
Size
- Female: 0.87 - 1.22 mm
- Male: 0.65 - 0.99 mm
Distinguishing characteristics
- Form of seminal receptacle, ventral lobe large in lateral view, dorsal lobe short and finger like
- Shape of forehead and rostrum
- Prosome : Urosome ratio
- Similar to females of C.brevipes & C.parapergens.
- Similar to males of C.paululus but C. pergens is more slender, longer and the prosome is less tapered
Male
- Rostrum in lateral view knoblike and protruding ventrally
- Longer ramus of P5 and genital pore on left side
- Left P5 longer than urosome, right P5 2 segmented, distal segment small
Female
- Rostrum in lateral view slender and curved ventroposteriad
- P5 segment 3 more than twice as long as segment 1
- Prosome:urosome ratio 2.57-3.00:1
- Ventral profile of genital segment in lateral view somewhat convex, but without a definite step
- Genital somite more than1.5 times as long as urosome somite 3
- Ventral lobe of seminal receptacle in lateral view large and visible anterior to base of seminal receptacle dorsal lobe
- Dorsal lobe short and finger like
- Dorsal and ventral lobes visible in ventral view
Distribution
- Epipelagic, bathypelagic.
- Warm temperate, circumglobal.
- The distribution in Australia includes the south east
Ecology
References
- 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