275. Mactra guidoi Signorelli & Scarabino, 2010 ★

Bathymetric distribution: 20–40 m —SW.

Geographical distribution: Brazil (ES) to Argentina (Valdés Peninsula)—B/A.

Remarks: This species has been referred as M. patagonica d'Orbigny, 1846 (e.g., Rios 1970, 1975, 1985, 1994, 2009), which is in turn considered by Signorelli & Scarabino (2010) restricted to fossils from the Quaternary. Signorelli (2019) refers to this species as Spisula (Spisula) guidoi .

References: Cauqüoin (1967a), Rios (1970, 1975, 1985, 1994, 2009), Signorelli & Scarabino (2010), Signorelli & Pastorino (2012b), Signorelli (2019).