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You are here:   OldClasses > 2012 > Coeloplana agniae | Sara Guillouzouic




Coeloplana agniae Davydoff, 1930

Benthic ctenophore

Sara Guillouzouic (2012)



Fact Sheet



Physical Description


Life History & Behaviour

Anatomy & Physiology

Evolution & Systematics

Conservation & Threat

Biogeographic Distribution

References & Links



The following description has been possible after relaxing the Coeloplana in MgCl2 and fixed in a 4% formaldehyde solution. They have been then stored in PBS (Phosphate Buffered Saline) at 4ºC.


Coeloplana agniae
is a small Plactytene that can measure up to 25mm.

Body plan description.

Ctenophores are characterized by a bilateral symmetry: two different planes can be found along the oral and ab-oral axis, also called the sagittal plane, and along the tentacles plane (or transverse plane)(Hernandez-Nicaise, 1991).


General appearance.

In general, the body is dorsoventrally flattened, elongate in the tentacular plane and is globally oval.

Three parts are very distinct: one composed by the apical organ in the middle of the animal which is non contractile and two lobe-like structures.

The lobe-like structures composed the main body which is transparent and vascularized. They are split by the oral groove which goes along the tentacle plan.


Coeloplana agniae is said to be sessile even it can actually creep and float.

Thus it can assume different shapes: while it remains still on a substrate, the benthic ctenophore assume a roundish shape.

When the animal is creeping, it is not assuming a regular shape as visible on the picture (left).

Coelopana agniae can also float away and assume a more oval shape.


On a black background, Coeloplana agniae appears to be transparent and the main central organs, around the mouth, seem to be white. The green pigmentation is only visible on the white organs.

The vascular system network spreads out from the centre until the periphery of the animal.The vessels' walls of the network are white.

All around the animal, some bright white cells are visible at the vessels’ ends.

On a White background, Coeloplana agniae appears to have a general transparent body with a green pigmentation.

The green dots seem to dissolve gradually and as one moves away from the centre. They are so dissolved that periphery looks yellowish.

The apical organ and the tentacle sheath are white.



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