Order : CALANOIDA
Family : Clausocalanidae

Next species

Ctenocalanus vanus (Giesbrecht, 1888 )
 

Total length : 0.8 to 1.7 mm

How to recognize a Ctenocalanus female:

Using a binocular :

The prosome shape is almost perfectly ovoid.

Only 3 thoracic segments are visible (prosome 4-segmented).

A1 slightly longer than boby.

The rostrum is short.

P5 very small.

Urosome 4-segmented with a regular cylindrical shape.

Furca short.

Using a microscope :

The rostrum consists of 2 slender filaments

Outer spines on third exopod of P3 and P4 with cristate inner margin

P5 asymmetrical, consisting of 2-4 segments on the left side only

How to differenciate C. vanus from other Ctenocalanus

Using a microscope :

The genital segment and the genital pore in lateral view have specific shapes (see figures).

Ecological Notes :

Common epi- and bathypelagic species


P5

P4

Genital segment lateral
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