Retusa truncatula (Bruguière, 1792)(Fig. 7 D1-D3) Bulla truncatula Bruguière, 1792: 377. Retusa truncatula – Landau et al. 2013: 337, pl. 77, fig. 11 (cum syn.). MATERIAL EXAMINED. — Sample F11: AMPG (IV) 2541-2544 (four specimens). DIMENSIONS. — Maximum height: 0.62 mm. DISTRIBUTION. — Early Miocene. Proto-Mediterranean Sea: Greece (this paper) (Aquitanian); Paratethys: Austria (Harzhauser 2002) (Burdigalian). Middle Miocene. NE Atlantic: France (Peyrot 1932); Proto-Mediterranean Sea: Turkey (Landau et al. 2013); Paratethys: Austria (Hörnes 1856; Berger 1953), Poland (Bałuk 1970), Hungary (Strausz 1966). Late Miocene. NE Atlantic: Portugal (Landau et al. 2013), Mediterranean Sea: Italy (Sacco 1896). Early Pliocene. NE Atlantic: Spain (Landau et al. 2011), central Mediterranean Sea: Italy (Chirli 2013). Early Pleistocene. central and eastern Mediterranean Sea: Italy (Cerulli-Irelli 1910), Greece (Koskeridou et al. 2009). Early-Middle Pleistocene. eastern Mediterranean Sea: Greece (Nielsen et al. 2006). Recent. NE Atlantic, Baltic Sea to Canary Islands and Mediterranean Sea (Thompson 1988; MolluscaBase 2018). REMARKS Juveniles, small specimens and fragments of Retusa truncatula were recovered in the Greek material. The morphology of the specimens of the present material is consistent with the range of variation of R. truncatula. Retusa truncatula has been recorded widely in the fossil record and it is still present in the northeastern Atlantic and Mediterranean (Landau et al. 2013; MolluscaBase 2018). It is possible that we are dealing with a cryptic species since the taxon seems very long-lived and widespread. As Oskars et al. (2015) mention, the phylogenetic relationships of the family should be investigated in detail, which could bring more information relative to the fossil representatives of the family Retusidae.

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 page 348, DOI: 10.5252/geodiversitas2019v41a8, http://zenodo.org/record/3700008