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 7NVY2 Bieler, P. M. Mikkelsen & Giribet 2014 [1099,1254,218,243] Bivalvia Animalia 85 86 Mollusca superOrder Imparidentia     Lucinoma apocalyptica new species( Fig. 57) https://zoobank.org/ FCF81E9E-956D-43D3-9FE3-39799DA3A13B   Type:  Holotype MZSP 162656, shell.    Typelocality: BRAZIL.  Pará; off Salinópolis, 01°04′N 46°18′W,  250 m[Femorale-Ex collection Vanin; RV Oregoncol., o.t.,  xi.1957].   Diagnosis:N Brazilian species of large size (~ 80 mm), thick walled. Sculpture simple, uniform, lacking undulations, carina or abrupt slope. Outline rounded. Umbo broad.   Description:Shell ( Fig. 57), of ~ 80 mm; outline rounded; walls heavy, thick. Color white, opaque. Maximum inflation ~half length ( Fig. 57C). Umbones central, slightly prosocline,anterior to it slightly concave edges,posterior to it slightly convex edges. Anterior, ventral and posterior edges performing soft rounded profile ( Fig. 57A, B, D, E); posterior slope very weakly undulated, less acuminated than anterior region. Sculpture concentric, low scales, rather irregular, discontinuous; interspaces equivalent to 3-4 times each scales′ width; sculpture uniform from umbo up to margins ( Fig. 57A, B). Pre-umbonal lunula present ( Fig. 57C), sculptures only by very narrow,crowd- ed, longitudinal lines. Ligament wide, mostly external, almost half of dorsal edge ( Fig. 57C). Hinge ( Fig. 57F-H) thick, ~8% of shell height; with pair of cardinal teeth in both valves, being anterior most tooth in right valve; posterior tooth in right valve and anterior tooth of left valve slightly bifid; weak anterior lateral tooth present, clearer in right valve ( Fig. 57G, H); no detectable posterior lateral tooth. Ligament groove wide, from umbo up to almost posterior edge. Scar of anterior adductor muscle elongated, ~7 times longer than wide, situated ~18° in relation to vertical axis, ~13° in relation to adjacent pallial line. inner surface pure white, barely radially beaded ( Fig. 57D, E). Scar of posterior adductor muscle elliptic, ~1.5 times longer than wide, with ~half of anterior muscle′s size. Scar of anterior pedal retractor muscle just superior and posterior to scar of anterior adductor muscle, rather rectangular, ~20 times smaller than adductor muscle. Pallial line complete, wide, anterior half nodulous; its anterior insertion in dorso-anterior edge of anterior adductor muscle edge; its posterior insertion in ventral end of posterior adductor muscle.   Etymology:The specific epithet is based on the Church Latin ‘apocalypsis,′meaning "revelation, disclosure," as well as from Greek ‘apokalyptein,′meaning "uncover, disclose, reveal," being an allusion to a large specimen being so far undiscovered in the north Brazilian deep waters.   Distribution:So far known from the typelocality. [864,1192,506,531] MZSP 85 86 MZSP 162656 1 holotype [794,1125,570,595] Brazil Para 85 86 1 holotype 1957-11 RV Vanin & Oregon Brazil 250 1.0666667 1308 -46.3 85 86 1 holotype