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Acartia danae
a female dorsal view;b female 5th leg; c female 2nd leg; d female 4th leg, posterior
aspect (modified from Nyan Taw 1978), scale values are in mm
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Image Key > Copepoda > Calanoida > Acartiidae > Acartia danae
Acartia danae
Giesbrecht 1889
Taxonomy
| Phylum |
Arthropoda |
| Subphylum |
Crustacea |
| Class |
Maxillopoda |
| Subclass |
Copepoda |
| Order |
Calanoida |
| Family |
Acartiidae |
| Genus |
Acartia |
Size
- Male: 0.73-0.80 mm.
- Female: 1.08-1.27 mm.
Distinguishing characteristics
- Top of head is flat or slightly triangular.
- Long, slender cigar-shaped body.
- Long, spaced out setae on antennae.
- Fresh specimens usually transparent, with prominent eye-spot (red or black).
- Metasome is pointed anteriorly in dorsal view and bears a pair of sharp points posteriorly (Giesbrecht 1892, Steuer 1923, Nyan Taw 1978, Bradford-Grieve 1999). This feature can be used to separate this species from other Acartia spp.
- Furca rather short.
- Furcal setae robust with fan-shape.
- Rostral filaments present (others in the Acartia genus have no rostrum).
Male
- Posterior metasome terminates in symmetrical points.
- Urosome 5-segmented.
- Urosome segment 1 with lateral hairs.
- 1st antenna geniculate on right side only.
Female
- Posterior metasome as in male.
- Urosome has no spines but has fine dorsal hairs on the posterior border of the first 2 segments.
- Genital segment is longer than the following segment.
- Antenna 1 extends to the tip of the caudal rami; 1st segment has strong, thick spine.
Distribution
- Epipelagic (occurs in the upper 200 metres).
- Inshore, coastal and oceanic waters of south-eastern Australia and New Zealand, south-eastern Australian waters (Dakin and Colefax 1933, 1940), south-eastern Tasmania (Nyan Taw 1978), New Zealand (Jillett 1971).
- Mainly oceanic, widespread in tropical and sub-tropical waters of Atlantic, Pacific and Indian Oceans (Bradford et al. 1999).
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