Conus kutaiensis (Beets, 1983)

Descrizione.

The shell has a moderately high spire. Ten post-nuclear whorls present, the shoulder rather prominent and bearing distinct though rounded tubercles.

On the younger whorls the shoulder moves gradually down into the suture while the tubercles develop into undulations, becoming faint and finally disappearing on the early part of the penultimate whorl, the shoulder becoming smooth and rounded. Spiral ornamentation initially consisting of two spiral threads, one along the adapical suture. The number of spirals increases to about eight, the adapical one being doubled and finally tripled: the most abapical of the latter spirals and the couple of spirals abapically from it, are more prominent than the other spirals. Secondary spiral threads are also developed, but both the three prominent spirals and secondary threads between them disappear quite unexpectedly and almost completely on the body whorl. According to the rather prominent growth Unes, which produce a slight crenulation of the spirals, the anal sinus is fairly shallow, forming a broad curve deepest close to the adapical suture. The older whorls are flat, the younger ones gradually becoming moderately

concave.

The last whorl is large, convex next to the shoulder, almost flat over much of its length, slightly concave along the rather prominent siphonal fasciole. Its surface is covered with numerous inconspicuous spiral threads of approximately

equal strength while near the abapical concavity three comparatively broad and flat spiral bands occur, each faintly subdivided. The most abapical portion of the body whorl covered with conspicuous spirals and grooves. The aperture gradually tapering towards the shoulder, siphonal notch shallow. Outer lip, according to the growth lines, broadly arched forward.

The comparatively low-spired varieties of C. terebra Born, 1780 (Abrard, 1942, p. 84, pi. 8, fig. 26) resemble the new species but are somewhat more elongate and the spire whorls are flat instead of concave, except in some recent representatives from Ternate and Aden in the Rijksmuseum van Natuurlijke Historie, Leiden, but even then, they have the normal well developed spiral ornamentation covering all of the body whorl.

C. everwijni Martin, 1883 (see van der Vlerk, 1931, p. 213) is perhaps related too, but much smaller, differently shaped, with pronouncedly stepped spire whorls and its shoulder not rounded as in C. kutaiensis.

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Conus kutaiensis

Plate 4 figs. 8-10

mm. 76

Miocene

Sungai Kari Orang, Kalimantan, E. Borneo

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Bibliografia

· (1) - Beets, C., 1983. Preangerian (Miocene) Mollusca from the lower Sangkulirang Marl Formation, Kari Orang, Kalimantan (East Borneo).Scripta Geologica, 67: 55 -57

· (1a) - Beets, C., 1983. Preangerian (Miocene) Mollusca from the lower Sangkulirang Marl Formation, Kari Orang, Kalimantan (East Borneo).Scripta Geologica, 67: 55 -57