Clausocalanus farrani
Sewell (1912)
Download a fact sheet for Clausocalanus farrani (PDF 366KB)
Taxonomy
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Maxillopoda |
| Subclass | Copepoda |
| Order | Calanoida |
| Family | Clausocalanidae |
| Genus | Clausocalanus |
| Species | farrani |
Size
- Female: 0.87-1.22 mm
- Male: 0.65 - 0.99 mm
Distinguishing characteristics
- Female C. farrani is distinct from all other Clausocalanus spp. (except C. jobei) in having a ventral protuberance of genital somite anterior to genital pores
- Shape of forehead and rostrum, C. jobei and C. farrani differ in form of rostrum in lateral view
- Prosome : Urosome ratio
- Male similar to but stouter in body than C. arcuicornis
Male
- Rostrum in lateral view knoblike and protruding ventrally
- Longer ramus of P5 and genital pore on left side
- Left P5 longer than urosome, 5th segment armed distally with slender, usually straight setae
- Right P5 short, 2 segmented, segment 2 very small
Female
- Rostrum in lateral view straight or slightly curved, short, thick and directed ventrad or slightly ventroposteriad
- Terminal points of P5 segment 3 divergent and always spinulate only in inner margins
- Prosome:Urosome ratio 2.3-2.64:1
- Ventral profile of genital somite in lateral view protuberant anterior to genital pores
- Separation of seminal receptacle dorsal and ventral lobes weak both in lateral and ventral view
- Genital somite more than 1.5 times as long as urosome somite 3
Distribution
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