Hortia priabonica, Kantor, Yuri, Lozouet, Pierre, Puillandre, Nicolas & Bouchet, Philippe, 2014

Kantor, Yuri, Lozouet, Pierre, Puillandre, Nicolas & Bouchet, Philippe, 2014, Lost and found: The Eocene family Pyramimitridae (Neogastropoda) discovered in the Recent fauna of the Indo-Pacific, Zootaxa 3754 (3), pp. 239-276 : 250-252

Hortia priabonica new species

Figures 2 F, 5D–G

Type material. Holotype MNHN ( MNHN.F. A47752 ), 8 paratypes MNHN ( MNHN.F. A47753 ).

Type locality and Age. France: Landes, Cauneille; Upper Eocene (Priabonian), "couches de Cauneille". Material examined. France: Landes, Cauneille, 30 specimens; Cagnotte, 200 specimens.

Description (holotype) ( Fig. 5 D–F). Shell small, narrowly fusiform, with elevated spire (LWL/SL 0.53) and attenuated, medium long canal. Shell consisting of 4 convex protoconch whorls and 3.7 slightly convex teleoconch whorls. Protoconch high conical; first and second whorls smooth with a distinct suprasutural thread formed by very fine granules (visible only under SEM), third and fourth whorls with strong, widely arched folds parallel to protoconch/teleoconch transition, crossed by irregular, opisthocline riblets. Protoconch diameter 680 Μm, height 1 mm. Suture shallowly impressed. Besides inconspicuous growth lines, teleoconch sculpture consisting of slightly prosocline axial ribs, 13 on penultimate whorl, 16 on last whorl, and regularly spaced, spiral cords, three on spire whorls. Ribs and cords form a very regularly reticulated structure with small rounded beads at intersections. Ribs run from suture to suture on spire whorls, and become obsolete on shell base at transition to canal. Canal with 10 spiral cords. Aperture medium high, narrow elongate, 0.30 (together with canal) of SL. Outer lip broken, concave at transition to canal. Columella short, slightly convex, smooth. Callus narrow, of thin glaze overlying parietal region. Siphonal notch not observed. Canal well differentiated from aperture, narrow, medium long, abaxially recurved.

Measurements (holotype). SL 4.3 mm, LWL 2.3 mm, AL (with canal) 1.4 mm, SW 1.4 mm.

Etymology. From its geological stage, the Priabonian.

Remarks. Hortia priabonica is very common in the Priabonian deposits of the Aquitaine Basin of SW France, although most specimens were juveniles. Even though the holotype is one of the largest specimens, it is not completely adult.

Hortia priabonica differs from H. arriuensis by its very regularly reticulated sculpture. The protoconch is also more broad conical and bears irregularly spaced opisthocline ribs. Teremitra hortensis has also reticulated shell sculpture, but it is more dense and the intersection of the ribs and spiral cords forms distinct beads. However, the sculpture is quite variable and, if it were not for the presence of columellar plaits (in T. hortensis ), juvenile T. hortensis could be confused with H. priabonica .

Figures

FIGURE 2. Overview of fossil and Recent Pyramimitridae. A. Endiatoma quadricincta (Cossmann, 1883), MNHN. F. A 47757, Lower Eocene, France. B – C. Pyramimitra terebraeformis (Conrad, 1848), MNHN. F. J 08748, Middle Eocene, USA. D – E. Pyramimitra quadralirata Dockery, 1977, MNHN. F. A 47750, Middle Eocene, USA. F. Hortia priabonica n. sp., MNHN. F. A 47752, Upper Eocene, France. G. Hortia arriuensis Lozouet, 1999, MNHN. F. A 47751, Upper Oligocene, France. H. Hortia pseudotaranis n. sp., New Caledonia, SL 8.4 mm. I. Hortia macrocephala n. sp., New Caledonia, SL 10.4 mm. J. Hortia paradrillia n. sp., New Caledonia, SL 8.1 mm. K. Hortia marshalli n. sp., New Zealand, SL 10.6 mm. L. Hortia spenceri n. sp., New Zealand, SL 9.0 mm. M. Hortia aotearoa n. sp., New Zealand, SL 9.0 mm. N. Hortia solitaria n. sp., South of Madagascar, SL 6.5 mm. O. Teremitra fallax n. sp., Solomon Islands, SL 11.8 mm. P. Teremitra efatensis (Aubry, 1999), Vanuatu, SL 10.8 mm. Q. Teremitra? hortensis (Vinassa de Regny, 1898), Upper Eocene, France. R. Teremitra sp., Taiwan, SL 16 mm. S. Vaughanites? superstes n. sp., Philippines, SL 19.1 mm.

FIGURE 5. Fossil species of Hortia Lozouet, 1999. A – C. Hortia arriuensis Lozouet, 1999, MNHN. F. A 47751, Upper Oligocene, St-Etienne-d’Orthe, Landes, France. D – G. Hortia priabonica n. sp., Upper Eocene, Cagnotte, Landes, France [D – F. MNHN. F. A 47752, holotype. G. MNHN. F. A 47753, paratype].