Two New Dicyemids from Sepia longipes (MollUsca: Cephalopoda: Decapoda)

• Published in: The Journal of parasitology Vol. 95; no. 3; pp. 681 - 689
• Main Author: Furuya, Hidetaka
• Format: Journal Article
• Language: English
• Published: Lawrence, KS American Society of Parasitologists 01-06-2009; Allen Press Inc
• Subjects: Animals; Biological and medical sciences; Cell lines; Cell nucleus; Cells; Cephalopoda; Cephalopods; Cilia; Crustacea; Decapoda; Dicyema; Embryonic cells; Embryos; Female; Fundamental and applied biological sciences. Psychology; General aspects; General aspects and techniques. Study of several systematic groups. Models; Immatures; Invertebrates; Invertebrates - anatomy & histology; Invertebrates - classification; Invertebrates - embryology; Invertebrates - physiology; Male; Marine; Mollusca; Mollusks; New species; Parasitology; Reproduction; Sepia; Sepia - parasitology; Somatic cells; Systematics-Phylogenetics; Japan; INW, Japan, Shikoku, Kochi Prefect., Tosa Bay; INW, Japan; Crustacea; Cephalopoda; Arthropoda; Parasite; Mesozoa; Decapoda; Invertebrata; Mollusca; Dicyemida
• ISSN: 0022-3395; 1937-2345
• DOI: 10.1645/GE-1875.1

Two new species of dicyemid mesozoan are described from Sepia longipes, Sasaki, 1913, collected from Tosa Bay in Japan. Dicyema oxycephalum n. sp. is a medium-sized species that is about 1,800 μm in length. It lives in folds of the renal appendages. The vermiform stages are characterized as having 28–34 peripheral cells, a conical calotte, and an axial cell that extends to the base of the propolar cells. Infusoriform embryos consist of 39 cells; 2 nuclei are present in each urn cell and the refringent bodies are solid. Pseudicyema cappacephalum n. sp. is also a medium-size species; it is about 1,000 μm in length. It too lives in folds of the renal appendages. The vermiform stages are characterized as having 32–34 peripheral cells, a cap-shaped calotte, and an axial cell that extends to the base of propolar cells. Infusoriform embryos consist of 39 cells; 2 nuclei are present in each urn cell and the refringent bodies are solid. This is the first description of dicyemids from S. longipes.