Triforis (Mastonia) turricula Hervier, 1898

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 : 56-58

Triforis (Mastonia) turricula Hervier, 1898 ( Fig. 33 )

Triforis (Mastonia) turricula Hervier, 1898: 263 , illustrated by Hervier (1899: pl. 17, fig. 9).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntype. New Caledonia • MNHN-IM-2000-1319; 1 specimen; from type locality.

ORIGINAL DESCRIPTION. — T. sinistrorsa , elongato-turrita, medio turgidula, apice acuminata, solida, alba, basi fusca, fasciis fulvis maculata. Anfractus 13-16: embryonales 4 rotundi, carinati, striatuli, cornei; intermedii sutura lineari discreti, subconcavi, longitudinaliter costulati, costulis rotundis, nitidè laevigatis, cingulis 3 gemmiferis ornati (2 tantùm in anfr. 4 subembryonalibus). Gemmae inaequales: in prima serie majores, tuberculosae, eminentes; in tertia serie paulò minores, subrotundae, intermediae lenticulares, multò minores; interstitiis laevibus, translucidis. Anfractus ultimus convexus, liris gemmiferis 5 decoratus (prima lira majore, caeteris decrescentibus), circà canalem paululùm depressus. Canalis brevis, unicarinatus, oblique recurvus, ad ortum clausus. Apertura obliquè piriformis, lateraliter ad suturam fissurata. Columella arcuata, fusca, propè canalem crassiuscula. Labrum infrà columellae adhaerens, subrotundè in medio prominens, latere planatum, ad suturam angulosè columellae supra junctum, subsutura internè canaliferum et sinu parvulo munitum. — Long. 4-6.50 mill.; diam. max. 1.50-2.50 mill.

Hab. Insula Lifou.Vidi 40 Specimina, à R. P. Goubin, S. M., collecta.

Varietas β. Albicans, J. Hervier.

Basi alba, fasciis fulvis minoribus maculata; lira prima non proeminens, liroe tertioe suboequalis.

Hab. Insula Lifou. Vidi 4 specimina.

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, turretedelongated, broad at the centre, acute apex, solid, white, brown base, spotted with brown bands. From 13 to 16 whorls: four rounded embryonic whorls, carinated, striated, corneous; intermediate whorls separated by a linear suture, adorned by three tubercled spiral cords (two in the four subembryonic whorls). Unequal tubercles: bigger in the first series of spiral cords, tubercular, prominent; slightly smaller in the third series, slightly rounded, intermediate tubercles are lenticular, much smaller; smooth interspaces, translucid. The last whorl is convex, decorated with five tubercled spiral cords (first cord is bigger, the others decreasing), slightly depressed near the siphon. Obliquely pyriform aperture, laterally fissured near the suture. Arched columella, brown, quite thick near the siphon. Below the lip is attached to the columella, slightly rounded and protruding in the centre, laterally flattened, angled near the suture and attached to the columella, internally channeled under the suture and with a small sinus. — Length 4-6.50 mm; maximum diameter 1.50-2.50 mm.

Locality: Lifou Island. I saw 40 specimens collected by R. P. Goubin. Variety β. albicans, J. Hervier.

White base, brown bands less maculated; first spiral cord not prominent, third cord almost similar.

Locality: Lifou Island. I saw 4 specimens.

DIAGNOSIS. — Shell conical with flat sides. Syntype 5.4 mm high. Teleoconch of c. 9 whorls. Three spiral cords present, the second appearing on the fourth whorl. First and third cords with tubercles at the intersection with rather orthocline axial ribs. Second cord initially with thin tubercles becoming larger towards the last whorl. Peristome incomplete in the syntype, but showing at least one additional spiral cord below the second. Base with three additional cords of which the first and second initially smooth but then developing tubercles towards the peristome, the third smooth. First teleoconch whorl white, other whorls white with brown blotches, darker on the first spiral cord. The base and the siphonal canal brown. Protoconch missing in the syntype.

Figures

FIG. 33. — Triforis (Mastonia) turricula Hervier, 1898, Lifou, New Caledonia, A, original figure in Hervier (1898); B-I, syntype, MNHN-IM-2000-1319; front (B, C), side (D, E), back (F), peristome (G, H), microsculpture (I); J, K, original label. Scale bars: B-F, 1 mm; G-I, 0.4 mm.