New species, misidentifications and problematic taxonomy of some Atlantic South American marine mollusks: a review Simone, Luiz Ricardo L. Papéis Avulsos de Zoologia 2024 2024-08-09 64 1 104 CJPY5 Simone 2024 [954,1109,1306,1331] Bivalvia Pinnidae Pinna Animalia Ostreida 79 80 Mollusca species pereria sp. nov.   ( Fig. 54) https://zoobank.org/ 429DA8F7-89FD-4179-ADDD-BE96D7F2310D  Types:  Holotype MZSP 165700, specimen.  Paratypes: MZSP 28508, 4spm from type locality. BRAZIL.  Bahia;  Salvador, Porto da Barra, 13°00′11.51″S 38°31′58.9″W, MZSP 131559, 2shells ( G.J.P. Queirozcol.,  i.1981; Colella collection).     Typelocality: BRAZIL.  Bahia; Salvador, Farol da Barra, 10°00′37.44″S 38°31′32.69″W,  5 m[ Simonecol.,  22.ii.1997].   Diagnosis:NE Brazilian species, with adult up to ~ 150 mm; color whitish to light yellow, transparent. Umbonal angle ~45-50°. Sculpture 6-8 radial wide folds in dorsal ⅔region only, relatively uniform or sinuous, each fold initially narrow; scales absent.   Description:Shell up to ~ 160 mm. Basic color whitish to light yellow; walls thin, rather flexible, transparent. Antero-posteriorly long, 2.3-2.5 times longer than heigh; flattened, ~5.6 times longer than wide. Middle blunt longitudinal weakly carina weakly developed, more pronounced in anterior third ( Fig. 54A, B, D-H). Sculpture growth lines, with weak concentric undulations in more posterior regions; lacking scales; 6 ( Fig. 54A, B, F-H) to 8 ( Fig. 54D, E) radial (longitudinal) folds, all of them initially narrow, with interspaces equivalent to their width in anterior third; gradually becoming less nitid, as simple undulations in middle and posterior thirds, but present up to posterior edge, producing barely undulated posterior edge ( Fig. 54E,G). Dorsal edge practically straight; ventral edge straight ( Fig. 54E, D), slightly concave ( Fig. 54A-B) to sightly convex ( Fig. 54F-H); posterior edge ample. Hinge edentulous, with ligament all along it, from anterior beak, up to short region posterior to posterior edge ( Fig. 54G). Posterior region and posterior half of ventral region with opened gap ( Fig. 54C). Inner surface glossy, with pair of iridescent regions in anterior third, separated by narrow longitudinal opaque band ( Fig.54G); muscular scars not clear.   Etymology:The specific epithet is a Latinization of the native Guarani word pererĩ, meaning "fragile," in allusion to the very fragile, almost friable shell.   Distribution:Coast of Rio Grande do Norte to Bahia, including Fernando de Noronha oceanic Island. [883,1287,1434,1459] MZSP 79 80 MZSP 165700 1 holotype MZSP Brazil Bahia 79 80 MZSP 28508, 4 1 Bahia paratype 1981-01 MZSP Salvador & da Barra & G. J. P. Queiroz Brazil -13.003198 Porto da Barra 1 -38.533028 79 80 MZSP 131559, 2 1 Bahia paratype [794,1134,1626,1651] Brazil Bahia 79 80 1 Bahia holotype 1997-02-22 da Barra & Simone Brazil 5 -10.0104 Farol da Barra 1 -38.525745 79 80 1 Bahia holotype