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Organization of the Lophophore Coelomic System in the Brachiopod Coptothyris grayi (Davidson, 1852) (Brachiopoda: Terebratulida)

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Abstract

The plectolophous lophophore, which is an organ characteristic of the order Terebratulida, is the most complex lophophore type in recent brachiopods. In the present paper, we provide the first 3D reconstruction of the coelomic system of the plectolophous lophophore using an example of the terebratulid brachiopod Coptothyris grayi (Davidson, 1852). We have found that this coelomic system consists of three entirely separated compartments. The first compartment includes a periesophageal coelom, as well as paired small and tentacle canals, and performs the transport and excretory functions. The second compartment consists of a pair of large coelomic canals of the lophophore that act as its hydrostatic skeleton. The third compartment is represented by a pair of brachial pouches connected with the perivisceral coelom that contain the diverticula of the digestive gland and allow the efficient use of the mantle cavity.

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Funding

The study was supported by the Russian Science Foundation, project no. 18-14-00082-P.

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  1. Department of Biology, Moscow State University, 119234, Moscow, Russia

    A. V. Ratnovskaya & T. V. Kuzmina

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  1. A. V. Ratnovskaya
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Correspondence to A. V. Ratnovskaya or T. V. Kuzmina.

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Translated by E. Shvetsov

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Ratnovskaya, A.V., Kuzmina, T.V. Organization of the Lophophore Coelomic System in the Brachiopod Coptothyris grayi (Davidson, 1852) (Brachiopoda: Terebratulida). Russ J Mar Biol 48, 266–275 (2022). https://doi.org/10.1134/S1063074022040083

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