Subeucalanus subcrassus
Giesbrecht (1888)
Download a fact sheet for Subeucalanus subcrassus (PDF 418KB)
Taxonomy
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Maxillopoda |
| Subclass | Copepoda |
| Order | Calanoida |
| Family | Subeucalanidae |
| Genus | Subeucalanus |
| Species | subcrassus |
Size
- Female: 2.35 - 2.68 mm
- Male: 2.40 mm
Distinguishing characteristics
- Female similar to S. crassus but slimmer, genital somite is also narrower
- Female anterior cephalosome rounded anteriorly, more pointed and extends further forward in lateral view than S. crassus
- Male similar but smaller than S. crassus, terminal setae on left P5 is longer than the terminal segment (shorter in S. plieatus)
Male
- Terminal seta on left leg 5 longer than the terminal segment
Female
- Anterior of head rounded anteriorly
- Genital segment broader than long with widest part in dorsal view on the posterior half of the segment
- Caudal rami assymetrical
- Antenna 2 endopod segment 1 shorter than endopod segment 2 and less than 3 times as long as wide
- Basipod 2 of mandibular palp with 3 setae, endopod reaches the distal boarder of basipod 2, endopod segment 1 with 2 detse, endopod segment 2 with 4 setae
- Maxilla 1 inner lobe 3 with 4 setae, basipod 2 with 5 setae
- Maxilliped endopod segments 1 and 2 with 4 setae each
- This species has often been confused with S. pilateus and S. monachus
Distribution
- Epiplanktonic
- Broadly neritic
- Tropical Indo-West Pacific
Ecology
References
- Bradford-Grieve J., (1994). The marine fauna of New Zealand: Pelagic calanoid copopoda: Megacalanidae, Calanidae, Paracalanidae, Mecynoceridae, Eucalanidae, Spinocalanidae, Clausocalanidae. New Zealand Oceanographic Memoir 102.
- Bradford-Grieve, J. M., E. L. Markhaseva, et al. (1999). Copepoda. South Atlantic Zooplankton. D. Boltovskoy. Leiden, The Netherlands, Backhuys Publishers. 1: 869-1098.