Anatoma pseudoequatoria Kay, new species. Height, 0.5 mm; diameter, 0.9 mm. Shell: turbinate, depressed, thin; periphery of last whorl bordered by a strong carina leading to a slit, the edges of which are slightly reflected and frilled; whorls above carina slightly convex, below carina concave, remainder of last whorl concave. Sculpture: minute, close-set curved ribs more distinct above carina than below, and with obscure spiral threads. Aperture: subquadrate, oblique, inner lip slightly reflected; umbilicus narrow, partly shielded by inner lip.
These scissurellids are found with Sinezona insignis in tide pools, on solution benches, and occasionally in sediments to depths of 30 m.
Type locality: Hilo, Hawaii on algae in the intertidal zone, May 8, 1970. Holotype: Bernice P. Bishop Museum No. 9740. Paratypes: Australian Museum, United States National Museum, British Museum (Natural History).
The shells are distinguished from those of other Indo-West Pacific scissurellids by their small size and depressed outline. They resemble the shells of A. equatoria Hedley, 1899, from Funafuti in sculpture but the shells of that species are larger (3 mm in diameter) and more inflated. Derivation of name: pseudein, Greek — to deceive. Refers to superficial resemblance to S. equatoria.