Anauchen picasso Gojšina & Páll-Gergely, 2025

Anauchen picasso Gojšina & Páll-Gergely sp. nov.

Figs 10 N View Figure 10 , 28 View Figure 28 , 29 View Figure 29 , 37 View Figure 37

Type material.

Holotype. Thailand • 1 shell (SH: 2.95 mm, SW: 2.79 mm); Prachuap Khiri Khan Province, Khao Sam Roi Yot National Park , 3 km S of Park Entrance; 12.208°N, 99.993°E; 31 May 1987; F. G. Thompson leg.; UF 529706 GoogleMaps . Paratypes. Thailand • 1 shell; same data as for holotype; CUMZ 14430 View Materials GoogleMaps ; 8 shells; same data as for holotype; UF 591339 GoogleMaps .

Additional material examined.

Thailand • 1 shell (juvenile / broken, not paratype); same data as for holotype; UF 583731 GoogleMaps .

Type locality.

Thailand, Prachuap Khiri Khan Province, Khao Sam Roi Yot National Park, 3 km S of Park Entrance; 12.208°N, 99.993°E.

Diagnosis.

Anauchen species with distinctly keeled last whorl (slightly below the centre of the periphery) which is also detached near the aperture and descending. Teleoconch spirally striated. Only four weak apertural barriers (parietal, upper palatal, lower palatal and columellar).

Description.

Shell conical or very slightly conical-ovoid, brown, consisting of 4.5–5 whorls separated by a deep suture. Protoconch not much lighter than the rest of the shell, roughly pitted and terminally spirally striated, consisting of 1.25 whorls. Initial teleoconch whorls and the penultimate whorl slightly keeled. Fine spiral striation visible on the teleoconch as well, sometimes stronger near the protoconch (on initial teleoconch whorls), sometimes stronger on the last whorl. There are several irregularly spaced whitish radial streaks crossing the spiral striae. Last whorl enlarged and distinctly keeled slightly below the centre of the periphery. The keel is equally strong along its length but is getting lost right behind the peristome. Last whorl slightly detached from the penultimate near the aperture and slightly descending (~ 15 ° compared to the shell axis), thus making the aperture profile prosocline to the shell axis. Peristome is dirty white, very thick, expanded but not reflected. Aperture rounded, almost as high as wide. There are only four relatively weak apertural barriers (parietal, upper palatal, lower palatal and columellar). Of them, parietal lamella is the strongest and highest and reaching the expanding peristome. Both palatal plicae (upper and lower) are of similar appearance (but lower is usually slightly stronger than the upper), both weak (low and short) and tubercle-like. They are positioned close to each other, probably closer than in any other congener. Columellar lamella is weak and dot-like, usually not present as a distinct barrier but rather as a columellar thickening which is gradually lowering towards the expanding peristome. Surface of all apertural barriers is very finely granulated. Sinulus wide and not strongly isolated from the rest of the aperture due to the relatively weak upper palatal plica. Umbilicus very narrow, elongated and measuring 1 / 8–1 / 9 of the shell width. There is a strong umbilical groove running along the umbilicus. This groove is very wide near the peristome and then regularly tapering towards the umbilicus, finally terminating at the ~ ½ of the last whorl.

Differential diagnosis.

This species is different from other congeners by the strongly keeled last whorl below the centre of the periphery and the presence of four apertural barriers which are quite weak. It is most similar to A. evanidus sp. nov. but A. picasso sp. nov. has a more strongly keeled last whorl, weaker apertural barriers, and is spirally striated.

Measurements

(in mm, n = 5). SH = 2.64–2.95; SW = 2.63–2.82; AH = 1.23–1.38; AW = 1.27–1.37.

Etymology.

This species looks like an Anauchen with rounded whorls painted in a Pablo Picasso style (i. e., resembling the art style known as Cubism). The specific epithet is to be used as a noun in apposition.

Distribution.

This species is known only from the type locality.