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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


Tentacular apparatus.

The tentacular apparatus is on what rely Coeloplana agniae to feed on plankton.
On the picture, the green cells are muscle cells as the Phalloidin only colores the actin.

The green filament on the upper part of the picture constitutes one of the two tentacles.

The core is made of a fibrillar matrix called the mesoglea, crossed by nerves and surrounded by muscle cells.

Muscle cells are also present in the tentilla, which are lateral branches coming out from the tentacles. Both the tentilla and the tentacles are retractable. Their movement is stimulated by any planktonic organism that may be caught by the adhesive cells: the colloblasts. These cells are of the micron size.

Both the tentales and tentilla are covered by colloblasts (also named collocytes), gland cells and sensory cells. Receptor cells are also supported by the tentillar epidermis.

Picture 1: One of the tentacular apparatus stained with
(blue cells) and Phalloidin (Actin colored in Green)

Picture 2: The tentacle sheath with the tentacle coming out from the opening.

The following pictures have been taken from plates where a small Coelolana agniae was sectioned. To obtain this result, the animal has been fixed, sectioned, mounted and finally stained with Mayer's haematoxylin and eosin. On this picture (x20), the tentacular apparatus is visible with the tentacle sheath and the opening, from where the tentacle goes in and out.There is no clearly visible limit between the tentacle sheath and the tentacle in itself.

Picture 3: Cross section of the tentacular apparatus

Picture 4: Cross section of Coeloplana agniae
This cross section shows that many organ are folded. The apical organ is set in the centre of the animal with the two tentacles on the sides.


Apical organ.

As there is no description related to pictures of the Coeloplana agniae apical organ so far, i have tried my best to legend the following pictures. It has been inspired by Lal and Rankin's drawings (see references).

The central mouth possesses a statolith visible when the oral lappets are open. The stomach is underneath the pharynx which is a little bit folded.

                                                                       Picture 5: Cross section of the central part (x20)

Gastrovascular system.

Apart from the apical organ and the tentacular system remains the lobe-like structures. They are transparent and a network is visible.
According to different sources (Rankin J. J. (1955), Lal S. S. (2009)) it could be the gastrovascular system or alimentary canals. Near the edge, the network branch turn into blind ends.

                                                                                        Picture 6: Edge of Coeloplana agniae



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