Ditrichocorycaeus andrewsi
Farran (1911)
Download a fact sheet for Ditrichocorycaeus andrewsi (PDF 454KB)
Taxonomy
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Maxillopoda |
| Subclass | Copepoda |
| Order | Cyclopoida |
| Family | Corycaeidae |
| Genus | Ditrichocorycaeus |
| Species | andrewsi |
Size
- Female: 0.65-1.07 mm
- Male: 0.65-1.04 mm
Distinguishing characters
- Peg like endopod of P4 with 2 setae and a small posterior projection
- Proportional length of urosome somites and caudal rami
- Female with short caudal rami compared to other female Ditrichocorycaeus
- Male has oval genital somite with small ventral hook
Male
- Prosome 1.5 times as long as urosome
- Caudal rami as long as anal somite
- Slight swelling on sides of second pedigerous somite
- Genital somite broad oval, 4/5 as wide as long
- Small ventral hook
- Anal somite as long as wide
- Caudal rami 4 times as long as wide at proximal end
- Prosome points extend to 1/3 of genital somite
Female
- Prosome 2 times as long as urosome
- Cephalosome separate from 1st pedigerous somite
- 3rd pedigerous somite with wing-like projections
- Prosome points extend to less than middle of genital somite
- Caudal rami just shorter than anal somite and half as long as genital somite
- 2 groups of fine hairs on genital somite when viewed laterally
- No ventral hook
Distribution
- Epipelagic
- Coastal and oceanic
- Subtropical and tropical
- Indian and Pacific oceans
Ecology
- Visual predators using raptorial appendages to capture small prey
- Little is known about the ecology of this species
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.
- Dahl, M. (1912). Die Copepoden der Plankton-Expedition. I. Die Corycaeinen. Mit Berucksichtigung aller bekannten Arten bearb. (Ergebnisse der Plankton-Exp. Bd II. G. f. 1.).@@Pages: (iv + 136) @
- Tanaka, O. (1957[1959]). On copepoda of the family Corycaeidae in Japanese waters 1957. Contx Dep Fish Kyushu Univ 3