Abstract
Marine flatworms in Pseudocerotidae Lang, 1884 are known as one of the most abundant groups among polyclads so far. To date, there have been specimen-based records of 36 named species in 5 genera in this family from Japan. The species of Nymphozoon Hyman, 1959 (Polycladida, Pseudocerotidae) are widely distributed in the Indo-Pacific Ocean, but the only known report of the genus in Japan is based on a photo of Nymphozoon orsaki (Newman and Cannon, 1996) taken in the Okinawa Islands. In this paper, we describe a new species from Japanese shallow waters, Nymphozoon cinderella sp. nov., which is characterized by having (1) square-shaped pseudotentacles with broad, black- colored edges and white tips, (2) dull grayish or brownish dorsal coloration, (3) a narrow brown-to-black line encircling the body periphery, and (4) a wide grayish dorsal middle band fringed with a brown-to-black line. Despite that the observed color pattern clearly distinguishes the new species from N. orsaki collected in Papua New Guinea, the p-distance based on partial (942 bp) 28S rDNA gene sequences (1.27%) was comparable to the intraspecific range for pseudocerotids. Further analyses based on more rapidly evolving genetic markers such as cytochrome c oxidase subunit I would probably be required to provide enough support to the molecular distinction between these two species having obviously different body color patterns.
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