Description: Shell from medium-sized (25-40 mm) to large (up to 70 mm in A. albina), from narrowly fusiform to broad, nearly ovate, usually with prominent shoulder and moderately long to long siphonal canal (0.17-0.26 of SL), straight or slightly recurved. Suture from shallowly impressed to channelled due to elevated subsutural portion of the whorls. Protoconch of about four whorls, upper 1.5-2 whorls smooth, later ones with arcuate axial ribs. Subsutural cord varying in strength, from bulging, occupying most of subsutural ramp and dominating over peripheral one (Anisogemmula sp. 05; Fig. 18L), to rather weak, smaller than peripheral cord. Subsutural cord with two to three distinct ridges, one usually strongly dominant, sometimes nodulose, nearly gemmate (Anisogemmula sp. 05) on later whorls, in A. albina obtuse, with up to five weak equal ridges. Subsutural ramp mosdy occupied by subsutural cord and weakly concave between subsutural and peripheral cords, with one to five additional smaller cordlets. Peripheral cord gemmate in most species, gemmae variable in size and density, bifid. Peripheral cord in A. albina bearing broad and widely spaced nodules intersected with two (in younger specimens) to three distinct spiral cordlets. Last whorl with several moderately developed to strong, rather evenly spaced main cords on base, with or without smaller cordlets between major cords. Siphonal canal with more closely spaced, distinct, uniform cords. Aperture (without canal) 0.22 0.31 of SL. Anal sinus medium-broad, on peripheral cord. Shell colouration varying from nearly uniformly white or light tan to orange or light brown; sometimes only subsutural cord orange. In A. albina, all spiral cords with regularly spaced small brown dots, and the peripheral cord with regularly spaced large subrectangular brown blotches. Radula with dúplex, shoe-shaped marginal teeth; anterior solid part constitutes about half of tooth length. Accessory limb of nearly equal width to major limb. Central formation absent.

Etymology: From ancient Greek (ánisos, 'unequaP), to reflect the extreme variation of the shell characters.

Remarks: The species comprising the genus Anisogemmula are remark-ably disparate in shell outline, sculpture and colouration. Anisogemmula albina in fact superficially appears much closer to Lophiotoma (its generally accepted generic allocation until Puillandre et ai, 2017) in shell sculpture and colouration than to the phylogenetically related species that exhibit a general Gemmula-like appearance. Therefore, providing a shell-based differential diagnosis is currendy not possible.

Distribution: From Mozambique and Madagascar to the central Pa¬cific (Philippines, Papua New Guinea, Solomon Islands, Vanuatu and New Caledonia); from upper subtidal to 500 m.