Redescription of a marine flatworm: Pseudoceros canadensis Hyman, 1953 (Polycladida: Cotylea)

Author:

Ching Hilda Lei

Abstract

Specimens of Pseudoceros canadensis were studied alive, as stained whole mounts and sagittal sections, and with the aid of scanning electron microscopy. This species is oval in shape with frilled edges. The anterior marginal folds bear a pair of small, erect tentacles. The worms have a dorsal pattern of black spots and streaks, white dendritic or horizontal streaks in the medial area, and white spots towards the outer edges. Dorsal papillae, not previously described, are small, clear or white projections on the entire surface. They are nonciliated, epithelial extensions supported by parenchymal dorsoventral muscles. The dorsal epithelium also contains the tops of subepidermal gland cells, rhabdite-producing cells, ciliated columnar cells, and vacuolated cells. In contrast, the ventral surface is cream colored with the ruffled pharynx and highly muscular, central sucker appearing as prominent white organs. The ventral epithelium lacks papillae and has fewer rhabdite-producing cells. This species is found in association with tunicates on docks and in low intertidal to subtidal areas.

Publisher

Canadian Science Publishing

Subject

Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics

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