Type material. Slate Rock, Big Sur, Monterey County, California, 36° 07.599* N, 121° 38.992* W, 23 Jun 2017, on rocky reef at 19.5 m (= SW 12), holotype LACM 3498, length 11.8, width 5.4 mm, 1 lv.
Distribution. From Slate Rock, Big Sur, Monterey County, California (36° N), to Cayucos, San Luis Obispo County, California (35° N).
Description. Shell extremely small for genus, length 11.8 mm, width 5.4 mm (holotype), spire tall, protoconch often truncated, dark colored horizontal dashes characteristic. Spiral cords with strong microscopic ribs, shape slender, elongate, color orange, with dark brown horizontal dashes on primary ribs, rarely all brown. Spire acute, slender, protoconch bulbous, teleoconch sculpture with peripheral keel, one keel below, heavy ribbing in subsequent whorls. First whorl missing in holotype, second whorl with P1, P2, third with P1, P2, starting IP, fourth whorl with SP, IP, P1, P2, starting s2, P3, s3, fifth whorl with SP, IP, P1, P2, s2, P3, s3 starting adis; last whorl with SP, adis, IP, P1, sl, P2, s2, P3, s3, P4, s4, P5, P6, s6, MP, ABP. Primary cords somewhat bulbous at rib intersections, secondary cords vary in strength. Denticle morphology D1-D6 split; Dl weak. Aperture elongate ovate, lip slightly projected at anterior end, parietal wall long, relatively wide, denticles in outer lip somewhat weak, canal not fully sealed in holotype.
Remarks. Paciocinehrina pseudomunda seems to be endemic to central California and is primarily found at subtidal depths, intertidal specimens found worn and crabbed. This species resembles the holotype of P. munda, but is more slender in shape, has more distinct ribbing on teleoconch whorls, more dramatic, darker colored, dash marks on primary cords, and lacks s5 and ADP, but additionally has SP and s4, not seen in P. munda. Furthermore, the size of P munda is much larger with specimens never recorded as attaining a height at maturity below 12.6 mm, whereas specimens of P. pseudomunda have rarely been recorded larger than 11.0 mm and without sealed canals, consistently recorded with an additional teleoconch whorl despite P pseudomunda being smaller in size.
Etymology. The name pseudomunda is in reference to the striking resemblance to P munda.