Lanistes thaytinitiensis, Neubert & Damme, 2012
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publication ID |
https://doi.org/ 10.5169/seals-787080 |
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DOI |
https://doi.org/10.5281/zenodo.5838572 |
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persistent identifier |
https://treatment.plazi.org/id/B56A8789-FFEC-E509-0DE4-FD55FD33FEE1 |
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treatment provided by |
Carolina |
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scientific name |
Lanistes thaytinitiensis |
| status |
sp. nov. |
Lanistes thaytinitiensis View in CoL sp. nov.
( Fig. 7 View Fig )
Type specimens: Holotype NMBE 5018966 View Materials ; paratypes NMBE 5018967–5018969 View Materials , MNHN/2 View Materials , SMF 340185 View Materials /2.
Type locality: Thaytiniti , Dhofar, Oman .
Stratum typicum: Paludal biomicritic limestones of the Zalumah Formation.
Age: Late Priabonian.
Material: This species was only recovered from the Zalumah exposures at Thaytiniti. Collected by M. Pickford during one of the palaeontological missions led by H. Thomas in 1988–1990.
Etymology: named after the type locality.
Diagnosis: A palaeogene species of Lanistes characterized by the discoid shape and flattened upper side.
Description: Medium sized Lanistes ; discoid shell consisting of 4 ½ whorls with virtually no exserted spire, apex pointed; upper part of the gradually increasing whorls completely flattened, lower part convex, forming a peripheral angle accentuated by a ridge; at the base the periphery of the whorls form a second angle with the flattened walls of the umbilicus, in which the whorls wind downwards (or upwards being hyperstrophic) in a regular spiral; aperture horizontal at the top, the outer margin convex, the upper part of the inner margin, connected to the shell, concave and the free lower part straight, basal margin pointed; growth lines regular and fine, no spiral sculpture; operculum unknown.
Measurements: Holotype ( Fig. 7 View Fig ): H = 12.5 mm; W = 38.2 mm; h = 12.0 mm; w = 11.5 mm. Paratype (NMBE 5018967): H = 11.2 mm; W = 32.2 mm; h = 11.2 mm; w = 10.3 mm.
Remarks: We did not find any fossils of this species in the Salalah region, while in the Zalumah exposures at Thaytiniti is seems to be the most common of the two Lanistes . This indicates either a difference in age or in environmental conditions between these two sites. Lanistes thaytinitiensis sp. nov. is the only flattened discoid Lanistes species known.
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