BOUCHET, Fedosov & Puillandre & Herrmann & Kantor & Oliverio & Dgebuadze & Modica & Bouchet, 2018

KANTOR & BOUCHET GEN. NOV.

( FIGS 19, 20A–E)

Type species: Mitra tornata Reeve, 1845 ; OD, herein.

Diagnosis: Shell small (9–30 mm), fusiform or broadly fusiform to biconical, vividly coloured. Protoconch pointed, narrowly conical, of about three slightly convex, glossy whorls. Suture slightly impressed, often indistinct. Teleoconch whorls evenly convex or flattened, sometimes giving the spire a distinctly stepped profile. Sculpture of strong, rounded spiral cords, regularly interspaced and covering the entire shell or, rarely, limited to shell base. Interspaces between cords concave, smooth or bearing fine, dense riblets. Siphonal canal moderately long, stout, siphonal notch shallow or absent. Aperture rather narrow, elongate, with undulating outer lip, sometimes bearing rounded denticles on its inside. Inner lip calloused, often reflected, with three to four strong columellar folds, adapicalmost strongest. Radula with broad laterals, bearing equal, rather long, widely set cusps throughout their width; rachidian not exceeding half the width of the laterals, multi- or unicuspidate ( Fig. 20A–E).

Distribution: Indo-Pacific, intertidal to upper subtidal depths, rocky flats, reef crevices and coral rubble.

Species included: Pseudonebularia atjehensis (Oostingh, 1939) 1 comb. nov., P. chrysalis (Reeve, 1844) 3 comb. nov., P. cingulata (A. Adams, 1853) 3 comb. nov., P. connectens (Dautzenberg & Bouge, 1923) 1 comb. nov., P. cucumerina (Lamarck, 1811) 3 comb. nov., P. cuyosae ( Poppe, 2008) 3 comb. nov., P. damasomonteiroi (Cossignani & Cossignani, 2007) 3 comb. nov., P. doliolum (Küster, 1839) 3 comb. nov., P. dovpeledi (Turner, 1997) 3 comb. nov., P. fraga (Quoy & Gaimard, 1833) 2 comb. nov., P. gracilefragum ( Turner, 2007) 2 comb. nov., P. indentata (G. B. Sowerby II, 1874) 3 comb. nov., P. kantori ( Poppe, Tagaro & Salisbury, 2009) 3 comb. nov., P.kilburni ( Poppe, Tagaro & Salisbury, 2009) 3 comb. nov., P. lienardi (G. B. Sowerby II, 1874) 3 comb. nov., P. maesta (Reeve, 1845) 1 comb. nov., P. oliverai ( Poppe, 2008) 3 comb. nov., P. pediculus (Lamarck, 1811) 1 comb. nov., P. perdulca ( Poppe, Tagaro & Salisbury, 2009) 3 comb. nov., P. proscissa (Reeve, 1844) 3 comb. nov., P. rotundilirata (Reeve, 1844) 3 comb. nov., P. rubiginea (A. Adams, 1855) 3 comb. nov., P. rubritincta (Reeve, 1844) 3 comb. nov., P. rueppellii (Reeve, 1844) 3 comb. nov., P. rutila (A. Adams, 1853) 3 comb. nov., P. sarinoae ( Poppe, 2008) 3 comb. nov., P. semiferruginea (Reeve, 1845) 3 comb. nov., P. silviae ( Turner, 2007) 3 comb. nov., P. tabanula (Lamarck, 1811) 1 comb. nov., P. tornata (Reeve, 1845) 1 comb. nov., P. wareni ( Poppe, Tagaro & Salisbury, 2009) 3 comb. nov., P. willani ( Poppe, Tagaro & Salisbury, 2009) 3 comb. nov., P. yayanae ( Huang, 2011) 3 comb. nov.

Etymology: Pseudonebularia means ‘false Nebularia ’ and refers to the long accepted, and erroneous, placement of the included species in Nebularia , which it resembles superficially. Gender feminine.

Remarks: Pseudonebularia gen. nov. comprises a group of popular, colourful shallow water or even intertidal mitres that are traditionally referred to Nebularia but, as demonstrated by our analysis, are not related to it, as Nebularia is recovered in a sister position to Pterygia . Species of Pseudonebularia gen. nov. typically have a small, but broad and robust, brightly coloured shell. While red and variegated biconical shells in species of the P. fraga group are quite distinctive, more elongated species, for example P. atjehensis , resemble species of Domiporta or Imbricaria as newly circumscribed here. The elongated Pseudonebularia species, however, can be distinguished by generally broader, rounded spiral cords that bear no darker lines on their crests.

The three species of Pseudonebularia studied anatomically show a significant disparity in radular morphology, with rachidian varying considerably from bow-shaped with multiple densely set cusps to very narrow, but robust, bearing a single short, pointed cusps on a bulbous shaft.

GENUS GEMMULIMITRA FEDOSOV, HERRMANN ,