Pholadidae Lamarck, 1809

Delfino, Marina & Signorelli, Javier H., 2021, Fig. 13 in Fig. 12. Majella pristis n in Periclimenaeus djiboutensis Bruce 1970, Zoological Studies 60 (28), pp. 1-20 : 2

Family Pholadidae Lamarck, 1809 Subfamily Pholadinae Lamarck, 1809 Genus Barnea Risso, 1826 (ex Leach MS)

[= Barnia Gray, 1840: 150 (error pro Barnea ); Holopholas Fischer, 1887 in 1880–1887: 1133 (objective)].

Type species: Barnea spinosa Risso, 1826 (= Pholas candida Linnaeus, 1758 ), by monotypy.

Distribution: Cosmopolite.

Remarks: Barnea includes sixteen valid species widely distributed ( Monari 2009; Huber 2010). It differs from other genera within Pholadinae by having only a single lanceolate protoplax. In addition to that, the umbonal reflection is not septate, as in Pholas , and the valves are not divided by an umbonal-ventral sulcus as in Zirfaea ( Kennedy 1974) . Fischer (1887) introduced Holopholas as a subgenus of Pholas and included Barnea as a subsection of Holopholas , for this reason Barnea and Holopholas are objective synonyms. Barnea has two subgenera: Barnea s. s. and Anchomasa . Barnea s. s. does not occur in the southwestern Atlantic Ocean ( Kennedy 1974; Huber 2010). Species included into the subgenus Anchomasa have shells anteriorly beaked, wide posterior end and large pedal gape ( Kennedy 1974; Huber 2010).