Guadiella kolendaensis, Quiñonero-Salgado & López-Soriano, 2024

Quiñonero-Salgado, Sergio & López-Soriano, Joaquín, 2024, New data on the genus Guadiella Boeters, 2003 (Gastropoda: Hydrobiidae) from the northern half of the Iberian Peninsula, with the description of a new species, Nemus 14, pp. 102-111 : 103-105

Guadiella kolendaensis sp. nov.

(Figs. 1, 2, 4A)

Material: Holotype RMNH.MOL.350854 (Naturalis) ( Fig. 2 ) ; Paratypes: 3s. RMNH. MOL.350855 (Naturalis) . Other material examined: 40 shells in SQS collection, from the type locality.

Type locality: Fuente de Morales , Calanda ( Teruel province ), Spain. [30TYL370357]. 381 m a.s. l. (Fig. 6A). This is a spring with abundant and permanent water flow, which rises in a small cavity and is channelized with a rubber pipe. It is hard to localize and to access, due to its abandoned state, and the amount of vegetation around. It is located in a slope close to the Guadalope River, a tributary of Ebro River. This is also the type locality of Hadziella forneri Quiñonero-Salgado, López-Soriano & Rolán, 2023 .

Etymology: The specific name derives from the Celtiberian village of Kolenda, origin of the present village of Calanda.

Description: The shell is elongate, slender, with inflated whorls and a deep, well-defined suture

(Fig. 1A). The last whorl is much higher and therewith flatter. Protoconch of 1–1.5 whorls with a marked microsculpture of fine, irregularly shaped pits (most pits have grooves in the shape of a 6-pointed star in the centre and a more or less hexagonal outline, but the number of points varies from 5 to 8) (Fig. 1D). Teleoconch of 3 whorls, surface with poorly defined, low, irregular radial ribs with microsculpture of irregular, very fine and shallow pits (Fig. 1B). Aperture with slanted ovoid outline, slightly wider at base, edge reflected. A narrow ridge inside the aperture, close to the edge, supports the operculum. The final part of the last whorl is very slightly decollated, forming a narrow umbilical groove between aperture and penultimate whorl (Figs. 1, 2, 4A).

As only empty shells were found, no operculum has been seen. It is assumed to be horny, as in other species of the genus.

Dimensions: Shell height 0.87–1.16 mm, and width 0.34–0.50 mm. The aperture/last whorl has dimensions of 0.26–0.34mm. See Table 1 and Fig. 5.

Habitat: Stygobitic. Shells were washed out from their habitat, likely after sudden rises of the subterranean water levels. Shells had a mainly fresh appearance, given their transparent colour.

Distribution: Only known from the type locality.

Differentiating characters: Guadiella kolendaensis sp. nov. is similar to G. arconadae regarding microsculpture, but the latter has a wider apex, more inflated whorls, and the narrow ridge inside the aperture is much closer to the edge. The apex of Guadiella murita comb. nov. is slenderer, resulting in an inverted conical shape, whereas the microsculpture of the protoconch differs in having a dense pattern of irregularly arranged micropunctures. Guadiella pilelongata also has a slender apex, deep sutures with a narrow subsutural ramp and a protoconch with a fine microsculpture of variable shaped polygonal micropits. Like G. kolendaensis sp. nov., G. ballesterosi has a suboval and inclined aperture, but the sutures are deeper and it has very fine polygonal depressions on the protoconch and irregular spiral lines on the teleoconch, in addition to be larger in size. Guadiella andalucensis has lower upper whorls and a much broader final whorl, resulting in a much plumper shell. Guadiella ramosae is very similar in outline to G. kolendaensis sp. nov., but the whorls are more compressed whereas the apex is wider. Guadiella algarvensis has a substantially larger shell, with one additional whorl, is relatively narrower, and it narrows towards the apex; the microsculpture of the protoconch is much finer, formed by very dense and irregularly displayed micropunctures.

Figures

FIGURE2. Holotype of GuOdiellO kolendOensis sp.nov.Scale:1 mm