New species, misidentifications and problematic taxonomy of some Atlantic South American marine mollusks: a review Author Simone, Luiz Ricardo L. text Papéis Avulsos de Zoologia 2024 2024-08-09 64 1 104 https://doi.org/10.11606/1807-0205/2024.64.031 journal article 10.11606/1807-0205/2024.64.031 1807-0205 14705562 Class Scaphopoda Order Dentaliida Family Dentaliidae Genus Graptacme Pilsbry & Sharp, 1897 Graptacme obtura Fogarolli & Simone , new species ( Fig. 64 A-F) https://zoobank.org/ 41CB788D-9EA1-4011-8DD2-3354945D0AC4 Types: Holotype MZSP 166760 , spm . Paratypes : MZSP 121837, 6 spm from type locality. Type locality: BRAZIL . Espírito Santo ; Trindade oceanic island, Calheta beach, 20°30′37.6″S 29°18′28.1″W , 17 m [Protrindade Project, J.B. MendonÇa col., 26.x.2014 ]. Diagnosis: Species from Trindade oceanic island with striae and slit in posterior region longer than 11% of shell length. Rate of increase 0,078 mm /mm of length. Strong bilabial posterior aperture. Description: Size about 36 mm ; walls thin, translucid, color white; well curved, section circular ( Fig. 64A, B, D, E ). widening smooth (tax of increase about 0.078 mm /mm of length). Sculpture absent, shell smooth, glossy; except for posterior 11-15% of shell length possessing longitudinal, delicate striae in entire circumference; striae gradually disappearing anteriorly ( Fig. 64C, F ). Anterior aperture rounded; peristome simple, with cutting edges. Posterior aperture with very narrow, elongated slit in ventral, sometimes in lateral surface ( Fig. 64C, F ), from 11 to 15% of shell length, sometimes longitudinal ( Fig. 64F ), sometimes slightly oblique ( Fig. 64C ). Etymology: The specific epithet is derived from the Latin word obturus, meaning "plug", an allusion to the shell format. Distribution: Endemic from Trindade Island, Brazil .