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

Abstract

Abstract:A new species, Paramarteilia 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 infi ltration. Prevalence of infection throughout the study was 1.1%, with a maximum monthly prevalence of 3%. The intracellular 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.

Cockle Cerastoderma edule fishery collapse in the Ría de Arousa (Galicia, NW Spain) associated with the protistan parasite Marteilia cochillia

“…M. lengehi (Comps 1976) and M. maurini (Comps et al 1981) are not included in the comparison, the former be cause of the lack of morphological description and the latter because there were no morphological characters distinguishing it from M. refringens (Villalba et al 1993a, Longshaw et al 2001. Feist et al (2009) postulated that Marteilioides chungmuensis, a parasite whose sporulation takes place in the ovocytes of the molluscan host, should be included in the genus Marteilia because of its tricellular spore; the parasite of the Galician cockles was different from M. chungmuensis because the latter has 1 spore per sporangium and the inner sporoplasm can divide in 2 cells (Comps et al 1986). The thin anastomosing cytoplasmic projections from the outer sporoplasm observed in the parasite of the Galician cockles had not been described in other Marteilia parasites, but their taxonomic value is uncertain since they could be a result of spore retraction caused by fixation.…”

“…Two more species were proposed within the genus, M. lengehi, detected in the hooded oyster S. cucullata from the Persian Gulf (Comps 1976), and M. christenseni, found in the clam Scrobicularia plana in France (Comps 1983); these 2 species are poorly characterised, especially the former, probably because they were not associated with abnormal mortality. Feist et al (2009) proposed suppressing the genus Marteilioides and transferring the type species Marteilioides chungmuensis to Marteilia, thus including another species in the genus. M. chungmuensis parasitises ovocytes of the Pacific oyster Crassostrea gigas in Korea (Comps et al 1986) and Japan (Itoh et al 2002).…”

Parasites, pathological conditions and resistance to Marteilia cochillia in lagoon cockle Cerastoderma glaucum from Galicia (NW Spain)

“…Species identification of the plasmodia resembling immature stages of a Marteilia-like parasite was not possible because morphological characters with taxonomic value for this group of organisms appear late in the sporulation process (Feist et al 2009, Villalba et al 2014. Three species of the genus Marteilia, viz.…”

Untitled

“…Marteilia spp. is a protozoan parasite resulting in physiological d isorders and eventually death of the animal (Feist, Hine, Bateman, Stentiford, & Longshaw, 2009;Berthe et al, 2000). This protozoan parasite is distributed over a wide range of areas, including Oceania and Europe around Albania, Croatia, France, Greece, Italy, Morocco, Portugal, Spain, Sweden, Tunisia, China and the Un ited Kingdom (Wang, Lu, & Liang, 2012;Lopez-Flores et al, 2008a;Audemard et al, 2004;Kleeman ，Le，Berthe，& Adlard, 2002).…”