Halgyrineum louisae

The shell is up to 28 mm high, with a rather high spire, characteristically flattened along an axis perpendicular to the aperture.[2] Protoconch is with 3 whorls, the protoconch I is less than one whorl with a frosted surface, the protoconch II with a conspicuous sculpture of axial ribs and spiral cords, both narrower than the interspaces and forming a regular lattice.[2] Teleoconch is with 5-6 rounded whorls.[2] Sculpture of low, subequal spiral cords, as broad as the interspaces, with low and narrow axial ribs forming small knobs at their intersection with the cords.[2] Varixes are situated along the broadest section of the shell, moderately thick, repeated after a little more than half a whorl so that they are slightly and regularly offset along the spire, overrun by the spirals.[2] The aperture is oval; outer lip faintly fluted inside; parietal and columellar edge forming a continuous callus, the parietal edge with a small but well-marked denticle, the columella is faintly tuberculate.[2] Siphonal canal is open, moderate in length.[2] Shell colour is from very light tan to whitish.[2]

The type locality is Oahu, Hawaii, 180 fathoms (333 m).[2]

Distribution of Halgyrineum louisae include:

• scattered localities in the Indo-Pacific: Hawaii, French Polynesia, the Norfolk Ridge, New Caledonia, and Réunion, with a depth range 80–460 m.[2]
• the Atlantic: Great Mteor, Hyères and Irving seamounts, rare in 310–460 m.[2]

Type of larval development: long planktotrophic (teleplanic), inferred from multispiral protoconch with well-developed protoconch II.[2]

This article incorporates CC-BY-SA-3.0 text from the reference the World Register of Marine Species.[2]