Hypoconcha arcuata Stimpson, 1859

(Figure 3B)

Hypoconcha arcuata Stimpson, 1859: 64 .

Material examined. Brazil, São Paulo: 1 ♀, CCDB 5286, Ubatuba, 22.v.2013; 1 ♀ ov, CCDB 5355, Ubatuba, Saco do Cedro, coll. F. Zara, v.2014 ; 1 ♀ ov, CCDB 5514, Ubatuba, Saco do Cedro, coll. F. Zara, v.2014 .

Distribution. Western Atlantic—USA (North Carolina to Florida), Gulf of Mexico, Antilles, Colombia, Suriname, Guianas, and Brazil (Amapá, Pará, Maranhão, Ceará, Paraíba, Sergipe, Bahia, Rio de Janeiro, São Paulo) (Hay & Shore 1918; Rathbun 1937; Holthuis 1959; Williams 1965, 1984; Coelho & Ramos 1972; Powers 1977; Abele & Kim 1986; Barreto et al. 1993; Melo & Campos Jr. 1999; Mantelatto & Fransozo 2000; Barros & Pimentel 2001; Almeida et al. 2007b; Felder et al. 2009; Machado et al. 2009).

Remarks. Previous records on the coast of São Paulo state include Guarujá (Farol da Moela) (Melo & Campos Jr. 1999), Caraguatatuba (Braga et al. 2005), Ubatuba (Melo & Campos Jr. 1999; Mantelatto & Fransozo 2000; Bertini et al. 2004, 2010; Fransozo et al. 2012; Nucci & Melo 2012; Mantelatto et al. 2016a; Garcia Bento et al. 2018, 2019). Sequences accession number (GenBank): CCDB 5286—16S (MF490182), COI (MF490089) (Mantelatto et al. 2018a).