Pseudosubulina santi Gargominy, 2025

Pseudosubulina santi Gargominy sp. nov.

Figs 17 View Figure 17 , 18 View Figure 18

Type locality.

French Guiana, in the vicinity of Saül village, southern foothill of Bœuf Mort mountain.

Type material.

Holotype. French Guiana • 1 dry specimen; Saül, Arbre à contreforts au niveau du belvédère de Saül, crête sud de Bœuf Mort (SAUL 20) ; 3.62593 ° N, 53.21714 ° W; alt. 297 m; 16 Nov. 2018; OG, SS, ST, BF ( PAG & MNHN) leg.; MNHN-IM-2012-21923 GoogleMaps . Paratypes (8). French Guiana • 2 95 % ethanol specimens; Saül, Bananeraie, Crique gros fossé (SAUL 51) ; 3.6288 ° N, 53.21246 ° W; alt. 201 m; 14 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; Cambrouse à Guadua; MNHN -IM-2013-76444 ; MNHN -IM-2013-76882 (both tentatively barcoded without success) GoogleMaps • 6 dry specimens; same data as preceding; MNHN -IM-2018-14018 GoogleMaps .

Other material examined.

French Guiana • 1 95 % ethanol specimens; Saül, Bœuf Mort (SAUL 54) ; 3.63966 ° N, 53.21413 ° W; alt. 350 m; 15 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; MNHN -IM-2013-76486 (tentatively barcoded without success) GoogleMaps • 1 95 % ethanol specimen; Saül, Crête au sud de crique cochon (SAUL 58) ; 3.61427 ° N, 53.19857 ° W; alt. 127 m; 16 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; Pied d’arbre à contrefort et écorces mortes au sol; MNHN -IM-2013-76456 (tentatively barcoded without success) GoogleMaps • 1 95 % ethanol specimens; Saül, Abattis en arrière du village (SAUL 60) ; 3.62609 ° N, 53.21105 ° W; alt. 162 m; 17 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; Forêt bordant le village; MNHN -IM-2013-76488 (tentatively barcoded without success) GoogleMaps • 2 dry specimens; same data as preceding; MNHN -IM-2018-14165 GoogleMaps • 2 dry specimens; Saül, Mont Galbao (SAUL 47) ; 3.60183 ° N, 53.27239 ° W; alt. 650 m; 27 Nov. 2018; OG, SS, ST, BF ( PAG & MNHN) leg.; DZ brulée et cambrouse à l’est; MNHN -IM-2012-21982 GoogleMaps • 1 dry specimen; Saül, Cascades du Mont Galbao, face nord-est (SAUL 64) ; 3.60376 ° N, 53.26121 ° W; alt. 320 m; 19 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; Bordure de cambrouse; MNHN -IM-2018-14063 GoogleMaps • 1 dry specimen; Saül, Mont Galbao face nord-est (SAUL 65) ; 3.59681 ° N, 53.26257 ° W; alt. 503 m; 20 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; Cambrouse et lianes en forêt; MNHN -IM-2018-14042 GoogleMaps .

Diagnosis.

A Pseudosubulina of normal size characterised by its absence of sculpture on the shell where only growth lines are visible.

Description.

Holotype. Shell of normal size for the genus (height 13.1 mm, major diameter 2.9 mm), dextral, slender, turreted with straight outline, glossy, rather thin, semi-translucent, white. Whorls 13, rounded, slightly flattened at the periphery, with a rather deep straight crenulated suture all the way to the aperture. Protoconch smooth, protoconch / teleoconch transition indistinct. Surface of teleoconch with very fine and numerous growth lines. Aperture elongated, orthocline, with slightly more than 90 ° columellar-basal angle, cut by penultimate whorl. Peristome simple, with sharp margin, not reflected except at columellar edge; reflection of columellar edge more developed in its upper part. Umbilicus tiny, partially covered by columellar edge.

Etymology.

The species is named after Sébastien Sant, a good friend and experienced botanist and naturalist who helped us so much during our field trip in Saül.

Distribution.

This species is only known from French Guiana in the vicinity of Saül village, including the southern foothill of Mont Galbao.

Habitat.

Primary forest, under leaf litter on granitic or lateritic soil.

Remarks.

Paratype ( MNHN -IM-2013-76882 ) has the body white; first ~ 7 whorls darker because of dark hepatopancreas; tentacles elongated, white, a little darker at the tip; eyes not distinctly visible (Fig. 18 View Figure 18 ).

Four specimens were barcoded without success.

Pseudosubulina santi sp. nov. is the third species of the genus recorded from French Guiana. Although it is known only from Saül area, it is not rare there: it is recorded in the vicinity of the village as well as on Mont Galbao, i. e., at altitudes between 125 and 650 m a. s. l.

Pseudosubulina santi sp. nov. is found in syntopy with Pseudosubulina theoripkeni Gargominy & Muratov, 2012 .