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Author: (Tanaka, 1909)

Field Marks:
See diagnostic features and key to species.

Diagnostic Features:
Body relatively slender, trunk slightly tapering toward head. Snout moderately long, broad, and bell-shaped, preoral snout about 10 to 11% of total length; gill slits small, less than eye length; gill septa without projecting medial lobes; eyes rather small in adults, about 3% of total length; nostrils broad, their width 1.1 times the internarial space; incurrent and excurrent apertures moderately large and elongate-oval, anterior nasal flaps low and rounded; mouth long, large, and broadly arched, with dental bands not greatly expanded and with lower ones just behind uppers; mouth and labial furrows below eyes; labial folds not enlarged, with lower diagonal to body axis; mouth and teeth probably not enlarged in males. Interdorsal space almost twice first dorsal base, about equal to preorbital snout; first dorsal fin about two thirds as large as second, second dorsal base about 1.2 times the length of first; origin of first dorsal above posterior half of pelvic bases; second dorsal insertion somewhat in front of anal insertion; pectoral fins rather small, anterior margins about 11 to 13% of total length; inner margins fairly long, nearly length of pectoral bases; interspace between pectoral and pelvic bases short, about equal to preoral snout and about 8% of total length in adults; pelvic fins fairly low and broadly rounded; anal fin long, low, and angular, about four times as long as high, its base about equal to prebranchial space and 18 to 19% of total length in adults; caudal fin fairly long and narrow, without a dorsal crest of enlarged denticles. Lateral trunk denticles of body with crowns fairly flat and close-set, surface smooth and without a feltlike or fuzzy texture. Colour light grey brown above, whitish below and on fins. Adults moderately large, to about 67 cm.

Geographical Distribution:
Western North Pacific: Japan (southeastern Honshu), and China (Taiwan Island).

Habitat and Biology:
A little-known deepwater bottom shark from the slopes off Japan and Taiwan Island. Oviparous, with one egg per oviduct.

Size:
Maximum about 66 cm (adult female).

Interest to Fisheries:
None.

Remarks:
The account of this species follows Nakaya (1975).

Type material:
Holotype: Imperial University of Tokyo, no. 2153, 470 mm immature male. Type Locality: Near Misaki, Japan.

Flathead catshark (Apristurus macrorhynchus)