Conus infulatus    (Hoerle, 1976)

Conus turbinopsis (Gardner, 1937)

 

 

Diagnosis (1):

 

"Shell of medium size, moderately heavy, rather stout, suggesting in outline a rather slender, elongated top. Spire between one-fourth and one-third the height of the en tire shell, the sides uniformly converging at an angle of about 90° until the nucleus is reached, when the slope becomes bruptly much more steep. Suture line running directly in front of the periphery of the preceeding whorl, thus making a barely perceptible break in the uniformity of the slope. Whorls 10 or more, including the 1 or 2 small, smooth, laterally compressed protoconchal volutions and an axially costate turn. Periphery developed on the succeeding whorl acute, that of the whorls of the spire barely visible behind the suture line. External sculpture of spire restricted to vigorous incrementals, which mark the successive margins of the posterior siphonal notch. Suture lines distinct but inconspicuous. Body whorl sculptured in front of the periphery with 20 to 2 5 spiral fillets separated by squarely channeled sulci of rarely more than half the width of the fillets; spirals uniform for the most part in size and spacing but slightly narrower near the periphery and, at the anterior canal, appearing as crowded linear lirations; interspiral sulci finely striated by the incrementals. Shell rather conspicuously constricted and attenuated near the base of the body. Aperture rather narrow, the margins subparallel. Outer lip probably thin but broken in all specimens collected. Posterior siphonal notch moderately deep. Anterior canal narrow, feebly marginate." (Gardner, 1937)

 

Dimensions of holotype: height 20.0 mm,diameter 12.0 mm.

 

Holotype: USNM 371397.

 

Type locality: USGS 3856, five to six miles west-northwest of Mossyhead, Walton County, Florida (=TU 69).

 

Occurrence: Shoal River Formation, Florida; middle Miocene.

 

Figured specimen: USNM 371397 (holotype) .

 

Discussion: C. turbinopsis Gardner, 1937, is preoccupied by C. turbinopsis Deshayes, 1865, therefore a new name, C. infulatus, is proposed for the Shoal River species.

 

Perrilliat Montoya (1960, p. 27, pl. 4, figs. 5, 6) has figured a specimen of Conus from the Pliocene Agueguexquite Formation of Vera Cruz, Mexico, which she referred to the Shoal River species C. turbinopsis Gardner. Her illustration depicts a cone with beaded early whorls and the presence of this feature is confirmed in her description. As there are no beads on the early whorls of Gardner's species, Perrilliat Montoya's shell is undoubtedly C. multiliratus Bose, a species that occurs abundantly throughout the Isthmian area. The two species have a similar outline and the ornamentation of the last whorl of both consists of broad bands separated by incrementally striated grooves.

The first post-nuclear whorl of C. infulatus  nom. nov. bears a few axial costae but the remainder of the spire whorls are plain. The two species may easily be separated by this criterion alone.

 

 

 

Conus infulatus (1)

Plate V fig. 9

USNM 371397

mm. 20,0 x 12,0

Mossyhead, Walton County, Florida

 

Conus turbinopsis (2)

Plate XLIII fig. 12

USNM 371397

mm. 20,0 x 12,0

Conus turbinopsis (3)

mm. 34,4 x 18,8

 

Conus multiliratus (Bose, 1906) (1)

 

Conus turbinopsis

IGM 795

 

 

 

 

 

 

 

 

 

Bibliografia Consultata

 

·         (1) - Hoerle, S. E., 1976. The Genus Conus (Mollusca: Gastropoda) from the Alum Bluff Group of Northwestern Florida. Tulane Studies in Geology and Paleontology, 12 (1 )

·         (2) - Gardner, J., 1937. The Molluscan Fauna of the Alum Bluff Group of Florida. U.S. Geological Survey Professional Paper, 142-F