Meganodontia hoernea ( Des Moulins, 1868 )

Kiel, Steffen, Sami, Marco & Taviani, Marco, 2023, Mollusks (Gastropoda, Bivalvia) from Miocene cold-seep deposits in northern Italy: revisions and additions, European Journal of Taxonomy 910, pp. 115-160 : 144

Meganodontia hoernea ( Des Moulins, 1868)

Fig. 10E–G

Material examined

ITALY – Emilia-Romagna • 1 spec.; Guzzano ; MGGC 22320 (L = 50+ mm) • 2 specs; Castel di Casio ; MGGC 22321 ( Fig. 10E : L = 78, H = 79.5, W = 51.5 mm) . – Tuscany • 2 specs; Le Colline ; NRM Mo 205351 , Mo 205352 .

Remarks

See Kiel & Taviani (2017) for an extensive synonymy of this species. The few available Middle Miocene specimens (from Guzzano and Castel di Casio) are smaller (maximum length 77 mm) than those from the Upper Miocene, but are morphologically well within the range known of the Upper Miocene specimens ( Moroni 1966; Kiel & Taviani 2017).

Stratigraphic and geographic range

Upper Oligocene (upper Chattian) to Late Miocene, northern Italy.

Figures

Fig. 10. Lucinid bivalves from Calcari a Lucina seep deposits in northern Italy.A–D. Lucinoma perusina (Sacco, 1901). A–B. Articulated specimen showing lunule and anterior adductor muscle scar, from Castel di Casio (MGGC 22316). C. Internal mold from Castel di Casio (MGGC 22317). D. Specimen with preserved shell sculpture from Castiglion dei Pepoli (MGGC 22319).E–G. Meganodontia hoernea (Des Moulins, 1868). E–F. Complete specimen with some shell remains from Castel di Casio (MGGC 22321). G. Incomplete internal mold showing long and curved anterior adductor muscle scar, from Guzzano (MGGC 22320).