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1 August 2007 REDESCRIPTION OF TWO DICYEMENNEA (PHYLUM: DICYEMIDA) FROM ROSSIA PACIFICA (MOLLUSCA: CEPHALOPODA: DECAPODA)
Hidetaka Furuya
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Abstract

Two species of dicyemid mesozoan are redescribed from Rossia pacifica Berry, 1911, collected off Iwase in Toyama Bay, Honshu, Japan. Dicyemennea brevicephaloides Bogolepova-Dobrokhotova, 1962, is a large species that reaches about 4,000 μm in length. This species attaches to the surface of the branchial heart appendages. The vermiform stages are characterized as having 23 peripheral cells, a disc-shaped calotte, and an axial cell that extends to the propolar cells. An anterior abortive axial cell is absent in vermiform embryos. Infusoriform embryos consist of 35 cells; a single nucleus is present in each urn cell and the refringent bodies are absent. Dicyemennea rossiae Bogolepova-Dobrokhotova, 1962, is a medium species that reaches about 2,000 μm in length. This species lives in folds of the renal appendages. The vermiform stages are characterized as having 29– 34 peripheral cells, a conical calotte, and an axial cell that extends to the middle of the metapolar cells. An anterior abortive axial cell is present in vermiform embryos. Infusoriform embryos consist of 39 cells; 2 nuclei are present in each urn cell and the refringent bodies are solid.

Hidetaka Furuya "REDESCRIPTION OF TWO DICYEMENNEA (PHYLUM: DICYEMIDA) FROM ROSSIA PACIFICA (MOLLUSCA: CEPHALOPODA: DECAPODA)," Journal of Parasitology 93(4), 841-849, (1 August 2007). https://doi.org/10.1645/GE-1003R.1
Received: 18 July 2006; Accepted: 1 February 2007; Published: 1 August 2007
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