Two new species of dicyemids are described from 2 species of deep benthic cephalopods, Graneledone antarctica and G. macrotyla, collected in the Southern Ocean south of the Antarctic Convergence. Dicyemennea bathybenthum n. sp. was found in G. antarctica. It is a medium-sized dicyemid whose length does not exceed 1,000 μm. The calotte is bluntly rounded or conical in small individuals, but the shape becomes discoidal in large individuals. Nematogens and vermiform embryos have 23 peripheral cells. An anterior abortive axial cell is present in vermiform embryos. Other stages in the life cycle were not observed. Dicyemennea dorycephalum n. sp. was found in G. macrotyla. It is a medium to large dicyemid that rarely exceeds 4,000 μm. The calotte is distinctly pointed, similar in shape to a spearhead. Vermiform stages typically have either 25 or 27 peripheral cells. An anterior abortive axial cell is present in vermiform embryos. Infusoriform embryos have 37 cells, the refringent bodies are solid in composition, and 2 nuclei are present in each urn cell.
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April 2002
SYSTEMATICS-PHYLOGENETICS|
April 01 2002
NEW SPECIES OF DICYEMENNEA (PHYLUM: DICYEMIDA) IN DEEP-WATER GRANELEDONE (MOLLUSCA: CEPHALOPODA: OCTOPODA) FROM THE ANTARCTIC
Hidetaka Furuya;
Hidetaka Furuya
Department of Invertebrate Zoology, Santa Barbara Museum of Natural History, 2559 Puesta del Sol Road, Santa Barbara, California 93105-2936. [email protected]
* Present address: Department of Biology, Graduate School of Science, Osaka University, 1-16 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
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F. G. Hochberg
F. G. Hochberg
Department of Invertebrate Zoology, Santa Barbara Museum of Natural History, 2559 Puesta del Sol Road, Santa Barbara, California 93105-2936. [email protected]
† To whom correspondence should be addressed
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J Parasitol (2002) 88 (2): 330–336.
Citation
Hidetaka Furuya, F. G. Hochberg; NEW SPECIES OF DICYEMENNEA (PHYLUM: DICYEMIDA) IN DEEP-WATER GRANELEDONE (MOLLUSCA: CEPHALOPODA: OCTOPODA) FROM THE ANTARCTIC. J Parasitol 1 April 2002; 88 (2): 330–336. doi: https://doi.org/10.1645/0022-3395(2002)088[0330:NSODPD]2.0.CO;2
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