Oncaea scottodicarloi
Heron & Bradford-Grieve (1995)
Download a fact sheet for Oncaea scottodicarloi (PDF 371KB)
Taxonomy
Phylum | Arthropoda |
Subphylum | Crustacea |
Class | Maxillopoda |
Subclass | Copepoda |
Order | Poecilostomatoidae |
Family | Oncaeidae |
Genus | Oncaea |
Species | scottodicarloi |
Size
- Female: 0.48 - 0.61 mm
- Male: 0.41 - 0.48 mm
Distinguishing characteristics
- Size
- Proportional lengths of urosome somites
- Form and location of sclerotization between genital apertures
Male
- Prosome 2.5 times length of urosome (excluding caudal rami), 2.2 times urosome length (including caudal rami)
- Caudal rami about 1.6 times longer than wide (shorter than female)
Female
- Exoskeleton moderately chitinized
- Prosome 2.8 times length of urosome (excluding caudal rami) 2.4 times urosome length including caudal rami
- Genital double-somite 1.5 times as long as maximum width & 2.5 times as long as postgenital somites combined; almost square-shaped genital somite, stockier & broader
- Straight sclerozitation between genital apertures
- Anal somite 1.8 times wider than long & about ¾ length of caudal rami
- Caudal ramus about 2.3 times as long as wide
Notes:
- Closely related to O. media, O. waldermari and O. curta
- Distinguish between female O. media by proportional lengths of urosome somites (more elongated genital somite in O. media-genital somite is 2 times as long as the rest of urosome)
- Form and location of sclerotization between genital apertures (in O.media genital openings are closer to top 1/3 from the top while in O. scottodicarloi genital openings are almost ½ way from the top of genital somite)
- Relative lengths of endopod spines of P4
Distribution
Ecology
References
- Heron, G. A. and J. M. Bradford-Grieve (1995). "The marine faunaof New Zealand: Pelagic Copepoda: Poecilostomatoida: Oncaeidae." New Zealand Oceanographic Institute Memoir 104.
- Bottger-Schnack, R. (2001). "Taxonomy of Oncaeidae (Copepoda, Poecilostomatoida) from the Red Sea. II. Seven species of Oncaea s.str." Bulletin of Natural History Museum 67(1): 25-84.