Fasciolariidae (Gastropoda: Neogastropoda) of French Guiana and nearby regions, with descriptions of two new species and comments on marine zoogeography of northeastern South America Lyons, William G. Snyder, Martin Avery Zootaxa 2019 2019-04-12 4585 2 239 268 7P6VB Lyons & Snyder, 2008 Lyons & Snyder 2008 [238,690,1332,1358] Gastropoda Fasciolariidae Lamellilatirus GBIF Animalia Neogastropoda 15 254 Mollusca genus    Typespecies.  Fusus ceramidus Dall, 1889, Recent, Barbados, by original designation ( Lyons & Snyder, 2008: 236).   Diagnosis. Shell: small to medium size, fusiform, light-weight, with columellar folds faint or (usually) lacking and with abundant scale-like lamellae on sutural ramp. Radula: rachidian tooth subquadrate, longer than wide, with 3 forward-directed cusps, median cusp longest; lateral tooth wide, with single small cusp at medial edge, flanked by larger, mesially slanting saw-toothed cusps; much smaller cusp near lateral margin separated from others by wide gap ( Lyons & Snyder 2008: 228, fig. 3a, after Bullock 1968).   Remarks. Absence of columellar folds is common among genera of Fusininaebut also occurs among some genera of Peristerniinae, e.g. the Indo-west Pacific genus  FusolatirusKuroda & Habe, 1971, but the radula of  Fusolatirushas alternating long and short cusps on lateral teeth (Kuroda & Habe 1971: 182). Bullock (1968: pl. 8)figured radulae of several Western Atlantic species of Peristerniinaenow in Polygona Schumacher, 1817,  HemipolygonaRoveretto, 1899,  Pustulatirus Vermeij & Snyder, 2006,  Bullockus Lyons & Snyder, 2008and  Lamellilatirus. Of these, the  Lamellilatirusradula resembles those of species now classified in  Pustulatirus, but shells of that genus have distinct columellar folds ( Lyons & Snyder 2013a). The  Lamellilatirusradula also resembles those of some species of the Indo-west Pacific genus  Benimakia Habe, 1958(see Bouchet & Snyder 2012: figs. 3A–F), but shells of that genus have a labral tooth that is absent in  Lamellilatirus. In studies of molecular phylogeny of Fasciolariidae( Couto et al. 2016: 314, 315; Kantor et al. 2018: 4, 14), a species of  Lamellilatirusfrom French Guiana(IM 2013-56511) grouped with species of  Latirus Montfort, 1810,  Leucozonia Gray, 1847and Polygona Schumacher, 1817(genera customarily placed in Peristerniinae), not with genera of Fusininae. Five species of  Lamellilatirushave been described:  L. ceramidus( Dall, 1889)and  L. dominiquei,  L. eburneus,  L. lamyiand  L. sunderlandorum, all of Lyons and Snyder, 2013. Species of  Lamellilatiruswere known previously only in the southern Caribbean Sea, ranging from Puerto Ricoand Hondurassouthward to Venezuela. Two new species described here extend the range of the genus to northeastern South America.