Publication Abstract

Paramarteilia canceri sp. n. (Cercozoa) in the European edible crab (Cancer pagurus) with a proposal for the revision of the order Paramyxida Chatton, 1911.

Paramarteilia canceri sp. n. (Cercozoa) in the European edible crab (Cancer pagurus) with a proposal for the revision of the order Paramyxida Chatton, 1911.

S.W. Feist*, P.M. Hine, K.S. Bateman*, G.D. Stentiford*, M. Longshaw*

A new species of Paramarteilia, P. canceri sp. n. is described using light and electron microscopy from the edible crab Cancer pagurus L. captured from the English Channel. No external symptoms were noted, although infected animals were typically lethargic and unresponsive to external stimuli. Organs of infected animals were shrunken and collapsed compared with apparently healthy individuals. Although the infection was systemic, marked host responses were only noted in the hepatopancreas where the parasite induced a pronounced haemocytic infiltration. Prevalence of infection throughout the study was 1.1%, with a maximum monthly prevalence of 3%. The parasite was typically 15 µm in length and composed of a primary cell containing up to three secondary cells derived by internal cleavage. Each secondary cell contains two bicellular spores. The parasite is readily differentiated from the other described paramyxean species by a combination of the number of secondary and tertiary cells. In light of this new discovery, a revision of the phylum Paramyxea is proposed based upon comparison to the original descriptions of this parasite group in various species of invertebrate hosts. The proposed structure is based on the number of cells within the spores (tertiary cells), so that only three genera remain with in the phylum, namely Marteilia., Paramarteilia  and Paramyxa. Subsequent discrimination of species is based on a combination of the number of secondary cells within the primary cell and the number of tertiary cells within secondary cells. It is proposed that the genus Marteilioides is suppressed and the type species of the genus M. chungmuensis is transferred to Marteilia and that the other representative of the genus, M. branchialis, is transferred to Paramarteilia.  Further, Paramyxoides is considered as a junior synonym of Paramyxa and its type and only species P. nephtys should be transferred to Paramyxa.

Reference

S.W. Feist*, P.M. Hine, K.S. Bateman*, G.D. Stentiford*, M. Longshaw* (2009) Paramarteilia canceri sp. n. (Cercozoa) in the European edible crab (Cancer pagurus) with a proposal for the revision of the order Paramyxida Chatton, 1911. Folia Parasitologica 56: 73-85

S.W. Feist*, P.M. Hine, K.S. Bateman*, G.D. Stentiford*, M. Longshaw*

Folia Parasitologica 56: 73-85