Acharax doderleini ( Mayer, 1861 )

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 : 139-140

Acharax doderleini ( Mayer, 1861)

Fig. 8E–F

Solenomya doderleini Mayer, 1861: 364–365 .

Solenomya doderleini – Sacco 1901: 128, pl. 27 figs 1–4. — Merlino 2007: 188, pl. 17 fig. 5. — Harzhauser et al. 2011: 221, fig. 10.1–2. — Mikuž & Gašparič 2016: 156, fig. 10.1–2.

Acharax doderleini – Taviani et al. 2011: 1068, figs 4–6.

Material examined

ITALY – Emilia-Romagna • 3 specs; Ca’ Fornace ; MSF 2360 (L = 46.4 mm), MSF 2361 (L = 53.0 mm) • 2 specs; Caselle A ; NRM Mo 204848 .

Remarks

See Mikuž & Gašparič (2014) for a more extensive synonymy. Taviani et al. (2011) re-assigned “ Solenomya ” doderleini to Acharax , which is followed here. They gave its geologic range in northern Italy as Early Miocene (Burdigalian) to Late Pliocene (Piacenzian). The new material documented here falls well within this geologic range. This species occurs mainly in deep-water marls and at methane seep deposits. Already Mayer (1861: 365) wrote “I have found this [species] in the layer with large globular Lucines, forming the base of the Tortonian stage, at Pino, near Torino”, indicating the association of this species with members of the chemosymbiotic bivalve family Lucinidae , probably Meganodontia Bouchet & Cosel, 2004 or Lucinoma Dall, 1901 , as in many Calcari a Lucina seep deposits. Whilst frequently found in Mio-Pliocene deep-sea reducing sediments of the Italian Peninsula, Acharax is by contrast rarely found in Calcari a Lucina deposits ( Taviani et al. 2011). In the erratics found near Ca’Fornace, A. doderleini is associated with a few specimens of the lucinid Anodontia mioinflata Kiel, Sami & Taviani, 2018 .

Stratigraphic and geographic range

Neogene, northern Italy.

Figures

Fig. 8. Protobranch bivalves from Calcari a Lucina seep deposits in northern Italy. A–D. The nuculid Nucula aff. sulcata Bronn, 1831. A. MSF 2366. B. Right valve from Le Colline (MSF 1212). C. Right valve from Le Colline (MSF 1210).D. Left valve from Ca’ Cavalmagra (MSF 1311). E–F. The solemyid Acharax doderleini (Mayer, 1861) from Ca’ Fornace erratics. E. External mold of right valve (MSF 2361). F. Internal mold of right valve (MSF 2360).