New fossil gastropod species (Mollusca: Gastropoda) from the upper Miocene of the Canary Islands (Spain)
Author
Martín-González, Esther
Author
Vera-Peláez, José Luis
Author
Castillo, Carolina
Author
Lozano-Francisco, M. Carmen
text
Zootaxa
2018
4422
2
191
218
journal article
30040
10.11646/zootaxa.4422.2.3
eec03b6a-265e-42a3-a24c-2768daeb791a
1175-5326
1251497
4182A649-56E2-448D-B130-06FE28DEC013
Jujubinus ajachaensis
Martín-González & Vera-Peláez
sp. nov.
Figure 7 G, H, I
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.