Euthymia tibialis Jousseaume, 1884

Albano, Paolo G., Franco, Davide Di, Azzarone, Michele, J., Piet A., Bakker & Sabelli, Bruno, 2023, Review of the types of Indo-Pacific Triphoridae (Mollusca, Gastropoda) in the Muséum national d’Histoire naturelle, Paris, Zoosystema 45 (2), pp. 13-106 : 97-99

Euthymia tibialis Jousseaume, 1884

( Fig. 66 )

Euthymia tibialis Jousseaume, 1884: 266 , pl. 4, fig. 19.

TYPE LOCALITY. — Tahiti.

TYPE MATERIAL. — Syntypes. Tahiti • MNHN-IM-2000-498; 2 specimens; from type locality.

ORIGINAL DESCRIPTION. — Testa piramidali-elongata, solida, alba, eleganterque lineis fuscis longitudinalibus, interruptis, ornata; costata et liris parvis inaequalibus quadricincta; anfractibus persistentibus 17, sutura fere inconspicua separatis; ultime carinato, inferne complanato, costis quinque filiformibus, cincto; apertura, subrotundata; peristomate patulescente, obtusulo, rufo, alboque variegato; canali rufescente, elongato recurvo, minutissimeque striato. — long. 13, lat. 3 millim.

[Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Pyramidal-elongated shell, solid, white, finely adorned by longitudinal and interrupted brown lines; ribbed and with four unequal small spiral cords; whorls are always 17, separated by a usually fainted suture; carinated last whorl, inferiorly flattened, with five filiform spiral cords; roundish aperture; large peristome, slightly obtuse, coloured in red and whitish; reddish siphon, elongated and curved, finely striated. — length 13, diameter 3 mm.

DIAGNOSIS. — Shell conical with flat sides. Syntypes 12.2 and 12.3 mm high. Teleonconch of c. 15 whorls. Three spiral cords present, the second cord on the fifth whorl. A fourth suprasutural cord visible. Spiral cords rather smooth or weakly undulate, the more prominent third cord bears obtuse tubercles. The other cords tubercled near the peristome. Microsculpture of fine spiral threads. Peristome with an additional cord below the second spiral cord. Posterior sinus shallow. Base with two additional weakly tubercled spiral cords. Protoconch missing in the syntypes. Teleoconch with brown flammulae on a white background. Siphonal canal brown.

Figures

FIG. 66. — Euthymia tibialis Jousseaume, 1884, Tahiti: A, original figure in Jousseaume (1884); B-E, H, I, syntype 1, MNHN-IM-2000-498: front (B), side (C), back (D), microsculpture (E), peristome (H, I); F, G, M, N, original labels; J-L, syntype 2, MNHN-IM-2000-498: front (J), side (K), back (L). Scale bars: B-D, J-L, 2 mm; E, 0.4 mm; H, I, 0.5 mm.