Onubiella suberensis, Álvarez & Quiñonero-Salgado & López-Soriano & Glöer, 2024

Álvarez, José Francisco Martín, Quiñonero-Salgado, Sergio, López-Soriano, Joaquín & Glöer, Peter, 2024, Description of three new stygobiont snails of the families Hydrobiidae and Moitessieriidae from the southwestern Iberian Peninsula, Nemus 14, pp. 88-101 : 96

Onubiella suberensis sp. nov.

( Figs. 4 -6)

Type material. Holotype RMNH.MOL.350848 (Naturalis) (Fig.5A) . Paratypes:5 s. RMNH.MOL.350849 (Naturalis); 20 s. in JFMA collection; 20 s. in PG collection.

Type locality. Fuente de Sevilla , Zufre (Huelva province): 29S X734085 Y4190034; 05⁄10⁄2022; 16⁄12⁄2022; 09⁄01⁄2023; 14⁄05⁄2023 , JFMA leg. 375m a.s. l. (Fig. 10A). See description of the type locality in the species described above, Spiralix aenigmatica sp. nov. Description. Very small, valvatiform, planispiral or very low spire. Protoconch of about 1.5 whorls, teleoconch about 1.5 convex whorls with clear suture (especially dorsal side) and wide umbilicus. The whorls attach to the lower part of the previous whorl, without any overlap, remaining about flat on the dorsal side, whereas difference in whorl height is clearly reflected on the ventral side. Protoconch mottled with very fine, irre- gularly-arranged pits, teleoconch smooth with growth lines. Aperture round, peristome slightly reflected .

Anatomy. Penis simple without any outgrowth, broad at the basis and slim at the distal end. Female sex tract unknown.

Etymology. suber (Latin =cork), refers to the Fuente del Corcho (= Cork Spring) in which the species was discovered.

Dimensions. See Table 2 and Fig. 6.

Habitat. Stygobitic.

Other localities. Fuente del Corcho, La Corte-Cortegana (Huelva province); 29S X690054 Y4202569. 25⁄03⁄2018; 22⁄05⁄2021; 21⁄06⁄ 2021. 580 m a. s.l.

(Fig. 10B).

Distribution. Only known from the two localities mentioned above.

Differentiating characters. The shell of Corbellaria celtiberica Callot-Girardi & Boeters, 2012 , described from the province of Soria in northern Spain, is very similar but does not have the narrow neck (note the reflected peristome is only present in fully grown specimens). Also, the shell is slightly higher and height increases with width, whereas in Onubiella gen. nov. it is constant. In Corbellaria aperture height increases with width, in Onubiella gen. nov. also, but less. Anatomically, Onubiella suberensis sp. nov. has a simple penis without any outgrowth, while C. celtiberica has a simple lobe ( Callot-Girardi & Boeters, 2012, Fig. 10D).

Figures

FIGURE 4. SEM images of OnubiellQ suberensis sp. nov. A: Apical, apertural, and umbilical views;B: Detail of the initial whorls; C: Detail of protoconch ornamentation;D: Detail of teleoconch ornamentation.