Pyramistomia aliakmoni Thivaiou & Harzhauser & Koskeridou 2019, n. sp.

• Main Authors: Thivaiou, Danae, Harzhauser, Mathias, Koskeridou, Efterpi
• Format: Text
• Language: unknown
• Published: Zenodo 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Heterostropha; Pyramidellidae; Pyramistomia; Pyramistomia aliakmoni; North Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.3705810; https://zenodo.org/record/3705810

Pyramistomia aliakmoni n. sp. (Fig. 8 E1-E4) urn:lsid:zoobank.org:pub:A2760279-BE3E-4730-9688-9AB777F3A357 TYPE MATERIAL. — Holotype: sample F11: AMPG (IV) 1500. — Paratype 1: sample F11: AMPG (IV) 1501. — Paratype 2: sample F11: AMPG (IV) 1502. DIMENSIONS. — Maximum height: 1.95 mm; maximum width: 1.00 mm. ETYMOLOGY. — Named after the river god Aliakmon of Greek mythology (son of Oceanus and Tethys), who lived in the river Aliakmon where the specimen was collected. TYPE LOCALITY. — Felli village section, 40°01’4.55”N, 21°33’34.37”E, Mesohellenic Basin, Grevena area, Greece. TYPE LEVEL. — Pentalofos Formation, Aquitanian, lower Miocene. DIAGNOSIS. — Small-sized species of Pyramistomia with pyramidal shape, type C inverted protoconch, smooth whorls, canaliculated suture with distinct axial threads, and single, prominent spiral cord at abapical suture. DISTRIBUTION. — Early Miocene . Proto-Mediterranean Sea: Greece (this paper). DESCRIPTION Small solid pyramidal shell, apex blunt. Protoconch of type C, completely intorted. Teleoconch of 4-4.5 whorls. Suture canaliculated, impressed with distinct axial threads. Prominent spiral cord at abapical suture. Axial sculpture of inconspicuous strongly prosocline irregularly spaced growth lines; spiral threads on base. Columella thickened, with small tooth, bordering a narrow umbilical chink. REMARKS This species is set apart from other members of the family by its solid shell, its type C protoconch, and its strong spiral sculpture that consists of a prominent suprasutural spiral cord. Few species of Pyramistomia have been described in the fossil record and recent species are also scarce (Landau et al. 2013). Pyramistomia deubeli (Boettger, 1902) is a relatively well-known species from the middle Miocene of Europe (Paratethys, Proto-Mediterranean Sea). It differs from P. aliakmoni n. sp. in its additional spiral cord below the adapical suture and the broader outline. Recent species of Pyramistomia described by Peñas & Rolán (1999) and discussed by Landau et al. (2013) seem to belong to the genus Odostomia , and the placement in a particular genus is uncertain. The recent Odostomia fehrae Van Aartsen, Gittenberger & Goud, 1998, placed in Pyramistomia by van Aartsen et al. (1998), might rather be related with Eulimastoma according to Pimenta & Absalão (2004). : Published as part of Thivaiou, Danae, Harzhauser, Mathias & Koskeridou, Efterpi, 2019, Early Miocene Gastropods from the Felli Section (Proto-Mediterranean Sea NW Greece), pp. 323-366 in Geodiversitas 41 (8) on pages 353-354, DOI: 10.5252/geodiversitas2019v41a8, http://zenodo.org/record/3700008 : {"references": ["LANDAU B. M., HARZHAUSER M., ISLAMOGLU Y. & DA SILVA C. M. 2013. - Systematics and palaeobiogeography of the gastropods of the middle Miocene (Serravallian) Karaman Basin, Turkey. Cainozoic Research 11 - 13: 3 - 584.", "BOETTGER O. 1902. - Zur Kenntnis der Fauna der mittelmiocanen Schichten von Kostej im Krasso-Szorenyer Komitat. Mit einem Situationsplan der Fundpunket, 2. Verhandlungen und Mitteilungen des SiebenburgischenVereins fur Naturwissenschaften zu Hermannstadt 51 (1901): 1 - 200. https: // biodiversitylibrary. org / page / 35260319", "PENAS A. & ROLAN E. 1999. - La familia Pyramidellidae Gray, 1840 (Mollusca, Gastropoda, Heterostropha) en Africa Occidental. 4. Los generos Megastomia, Odostomia, Noemiamea y Syrnola. Iberus suplemento 5: 1 - 150. https: // biodiversitylibrary. org / page / 35660090", "AARTSEN J. J. VAN, GITTENBERGER E. & GOUD J. 1998. - Pyramidellidae (Mollusca, Gastropoda, Heterobranchia) collected during the Dutch CANCAP and MAURITANIA expeditions in the south-eastern part of the North Atlantic Ocean (part 1). Zoologische verhandelingen / uitgegeven door het Rijksmuseum van Natuurlijke Historie te Leiden: 1 - 57.", "PIMENTA A. D. & ABSALAO R. S. 2004. - Review of the genera Eulimastoma Bartsch, 1916 and Egina Dall & Bartsch, 1904 (Mollusca, Gastropoda, Pyramidellidae) from Brazil. Zoosystema 26 (2): 157 - 173."]}