Jujubinus ajachaensis Martín-González & Vera-Peláez

Martín-González, Esther, Vera-Peláez, José Luis, Castillo, Carolina & Lozano-Francisco, M. Carmen, 2018, New fossil gastropod species (Mollusca: Gastropoda) from the upper Miocene of the Canary Islands (Spain), Zootaxa 4422 (2), pp. 191-218: 202

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Jujubinus ajachaensis Martín-González & Vera-Peláez

sp. nov.

Jujubinus ajachaensis Martín-González & Vera-Peláez  sp. nov.

Figure 7 G, H, I View Figure

Type material. Holotype: complete small sized adult specimen, poorly conserved (H: 23.3 mm; W: 17.8 mm), record number TFMCFO-6532/8. Paratype: three adult samples recorded as TFMCFO-6532/5 (H: 20.6 mm; W: 16.3 mm); TFMCFO-6602 (H: 14.9 mm; W: 12.9 mm); TFMCFO-3 420 (H: 23.1 mm; W: 19.4 mm).

Other material examined. Another specimen from Lanzarote (TFMCFO-6602, Barranco de las Pilas) and 18 more from Fuerteventura (TFMCFO-3420, Morrete de los Castrillos; TFMCFO-3760, TFMCFO-6532, TFMCFO- 6583, Aljibe de la Cueva). Table 4 shows the biometrics and statistics for Jujubinus ajachaensis  nov. sp.

Type locality. Aljibe de la Cueva (Fuerteventura, Canary Islands). UTM 28 R 596484 m E 3171257 m N  , 12– 17 m asl. The level is composed of coarse, loose biogenic sandstones, from 30 to 70 cm thick. Tortonian dating defined by the gastropod association described above. The paratypes are from Aljibe de la Cueva and Morrete de los Castrillos in Fuerteventura , and Barranco de Las Pilas in Lanzarote.  

Etymology. The specific name is derived from Los Ajaches mountains, in the south of Lanzarote.

Description. Shell small (Hmax: 24.8 mm; Wmax: 10.4 mm), trochiform, fragile, with a high conical spiral, and higher than wide. Protoconch not observed in the studied specimens. Teleoconch composed of four whorls with a rounded profile, suture straight and moderately deep. Superficial sculpture nonexistent in adult individuals, except for fine folds in the last whorl that follow the direction of the fine, prosocyrt growth lines. Base slightly concave, with subquadrangular, holostomatous aperture. Lip not thickened. Some shells show an almost vestigial navel.

Remarks. This new Jujubinus  species is unlike any of the extant species distributed over the Canary Islands and their vicinity, which are of smaller size and display spiral cords throughout the shell. However, it is very similar to Jujubinus bucklandi ( Basterot, 1825)  from the French Aquitanian, featured in Cossmann & Peyrot (1918, pl. 4, figs 78–82) as Calliostoma (Strigosella) bucklandi  . In the revision of gastropods from the Aquitanian stratotype by Lozouet et al. (2001), it is re-described assigned to the genus Jujubinus  . This species differs from J. ajachaensis  sp. nov. in its lower mean height and by having spiral cords on the adapical zone of the last whorl.

Distribution. Upper Miocene, Tortonian: Lanzarote and Fuerteventura.