A Revision of the Pliocene Naticids of Northern and Central ITALY.III. The Subfamilies Poliniceinae and Sininae

Pedriali, Luca; Robba, Elio

doi:10.13130/2039-4942/6389

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“…The genus Natica is characterized by higher whorls, subelliptical aperture, thin outer lip and absence of denticles in the inner and outer lips, presence of umbilicus, sometimes covered by parietal callus (Cernohorsky 1971) and absent or vestigial umbilical callus (Cernohorsky 1971;Pedriali & Robba 2009).…”

Section: Remarksmentioning

confidence: 99%

“…After molecular and shell morphology analyses (Huelsken et al 2012) it was concluded to be a valid genus. Pedriali and Robba (2009) highlighted diagnostic features for the genus that are: thin to moderately thick, globose or globose-long shell and depressed to moderately raised spiral, somewhat stepped in some species. Suture almost close to compressed, parietal callus moderately thick in width and slender in length, with protrusion of the anterior lobe more or less distinct in the adaptive part of the umbilicus.…”

Section: Remarksmentioning

confidence: 99%

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Gastropods Colour Patterns in Cassiopids and Naticids from Romualdo Formation, Araripe Basin, Northeast Brazil

Pereira

Prado

Araripe

et al. 2022

Anu. Inst. Geociênc.

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The phylum Mollusca includes one of the most beautiful examples of colour patterns in present-day shells. However, they are rare in the fossil record because they demand excellent fossilization. In Brazil, colour patterns in fossil mollusk shells are recorded in gastropods Natica aff. bulbulus White, 1887 from the Riachuelo Formation (Aptian-Albian), Sergipe-Alagoas Basin. This paper presents the first gastropod shells from the Romualdo Formation with colour patterns, visible under natural and UV light, belonging to the families Naticidae and Cassiopidae, collected at Santo Antônio outcrop municipality of Exu, Pernambuco and, Pinheiro and Serra do Mãozinha sites, municipality of Missão Velha and Romualdo site, municipality of Crato, Ceará. Among the cassiopids more than 100 specimens were tested, with 1/3 of them showing a residual colour pattern under UV light exposure, after chemical preparation. They correspond to the species Paraglauconia (Diglauconia) araripensis (Beurlen, 1964), Paraglauconia (Diglauconia) lyrica Maury, 1934, Gymnentome (Gymnentome) carregozica (Maury, 1934) and Gymnentome (Gymnentome) romualdoi Beurlen, 1964. The colour pattern is virtually similar in both genera, with fluorescent stripes on a dark background, showing the taxonomic similarity between them. As for the naticids, about 20 specimens were collected and 15 show good preservation, observing the visible colour pattern under natural light in Natica sp. and Euspira sp.; both new taxa for the Araripe Basin. The residual colour pattern in naticids ranges from spiral stripes to sigmoidal lines and blotches of brown and yellowish tones on a paler background, as observed in fossil species of the same family in the Cenozoic. The new occurrences increase the fossiliferous diversity of mollusks of the Romualdo Formation and extend the understanding of the diversity of colouration patterns of Lower Cretaceous gastropods.

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Section: Remarksmentioning

confidence: 99%

Section: Remarksmentioning

confidence: 99%