Scaphopoda, Bronn, 1862

Class Scaphopoda View in CoL Order Dentaliida

Family Dentaliidae Genus Graptacme Pilsbry & Sharp, 1897

Graptacme obtura Fogarolli & Simone , new species ( Fig. 64 View Figure 64 A-F) https://zoobank.org/ 41CB788D-9EA1-4011-8DD2-3354945D0AC4

Types: Holotype MZSP 166760 View Materials , 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 View Figure 64 ). 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 View Figure 64 ). Anterior aperture rounded; peristome simple, with cutting edges. Posterior aperture with very narrow, elongated slit in ventral, sometimes in lateral surface ( Fig. 64C, F View Figure 64 ), from 11 to 15% of shell length, sometimes longitudinal ( Fig. 64F View Figure 64 ), sometimes slightly oblique ( Fig. 64C View Figure 64 ).

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.