Pinnoidea, Leach, 1819

Superfamily Pinnoidea View in CoL Family Pinnidae

Genus Pinna Linné, 1758 View in CoL

Pinna trindadis View in CoL new species ( Fig. 52 View Figure 52 ) https://zoobank.org/ FECE27D9-B6BA-481A-A2CA-402FF0FF5BD2

Types: Holotype MZSP 108933 View Materials , shell . Paratype: MZSP 105350, 1 spm from type locality, 23 m (17.ii.2012).

Type locality: BRAZIL. Espírito Santo ; Trindade Island, Enseada do Lixo , 20°31′33.9′S 29°19′33.6″W, 20 m [26. vi.2012] .

Diagnosis: Brazilian from Trindade, with adult of ~ 300 mm; color brown. Umbonal angle 50-60°. Sculpture ~10 radial wide folds,relatively uniform,each one widening towards posterior.

Description: Shell easily over 300 mm.Basic color brown, being slightly lighter close to umbos. Antero-posteriorly long, ~1.8 times longer than heigh; flattened, ~6 times longer than wide. Middle blunt longitudinal carina developed, more pronounced in anterior half ( Fig. 52A, B, D View Figure 52 ). Sculpture growth lines and concentric stairs, mainly in more posterior regions, where sometimes some isolated scale appearing ( Fig. 52C View Figure 52 ); ~10 radial (longitudinal) folds, 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. Dorsal edge practically straight ( Fig. 52 View Figure 52 A-B) or with weak posterior curve ( Fig. 52D View Figure 52 ); ventral edge slightly concave; posterior edge amply rounded. Hinge edentulous, with ligament all along it, from anterior beak, up to short region posterior to posterior edge. Posterior region and posterior half of ventral region with opened gap ( Fig. 52C View Figure 52 ).

Etymology: The specific epithet is derived from the local of occurrence – Trindade Island.

Distribution: Endemic from Trindade Island.

Habitat: Partially buried in sediment, 10- 23 m. Shell mostly covered by incrustations ( Fig. 52D View Figure 52 ), rarely found with clean shell ( Fig. 52 View Figure 52 A-C).

Measurements (L, H in mm): Holotype ( Fig. 52 View Figure 52 A-C): 301 by 162. Paratype: MZSP 105350 ( Fig. 52D View Figure 52 ): 314 by 190.

Additional material examined: BRAZIL. Espírito Santo; Trindade Island (ProTrindade Project), MZSP 131272 View Materials , 1 View Materials spm(J.MendonÇacol.), Calhetas ,offCalhetas, 20°29′54″S 29°18′17″W, 35m, MZSP 101104 View Materials , 1 View Materials spm(23.vii.2011),praia, 20°30′28.3″S 29°18′38.8″W, 8 m, MZSP 104436 View Materials , 1 View Materials spm, 1 shell (08.ii.2012), 20°30′36.1″S 29°18′44.2″W, MZSP 108253 View Materials , 1 View Materials spm (03.vii.2012) 20°30′18.72″S 29°18′31.67″W, MZSP 118389 View Materials , 1 View Materials spm (J. Braga col., 29.iv.2014), Enseada do Lixo , 20°31143.5!S 29°19′28.1″W, 15 m, MZSP 104434 View Materials , 1 View Materials spm (20.ii.2012), Ilha Racha , 20°30′24.04″S 29°20′47.86″W, MZSP 104438 View Materials , 1 View Materials spm, 1 shell (24.i.2012), 20°30′26.5″S 28°20′48″W, MZSP 109608 View Materials , 1 View Materials spm, MZSP 109837 View Materials , 1 View Materials spm (22.vi.2012), MZSP 122126 View Materials , 1 View Materials spm (J. Braga col., 12.xi.2014), MZSP 131268 View Materials , 2 View Materials spm, 22 m, MZSP 131270 View Materials , 1 View Materials spm, 21 m (J. MendonÇa col., 01.vii.2016), Andradas, 20°28′47.69″S 29°18′24.03″W, MZSP 105366 View Materials , 4 View Materials spm (06.ii.2012), Orelhas, 20°29′32.5″S 20°20′32.6″W, MZSP 108934 View Materials , 2 View Materials spm (22.vi.2012), 20°29′40.2″S 29°20′32.9″W, MZSP 115453 View Materials , 2 View Materials spm (06.vii.2013), MZSP 118252 View Materials , 1 View Materials spm, MZSP 118376 View Materials , 1 View Materials spm (J. Braga col., 04.v.2014), MZSP 121994 View Materials , 1 View Materials spm, MZSP 122173 View Materials , 1 View Materials spm (J. Braga col., 24.x.2014), MZSP 131267 View Materials , 1 View Materials shell (J. MendonÇa col., 02.vii.2015), Farrilhões, 20°31′02.4″S 29°19′32.9″W, MZSP 110004 View Materials , 1 View Materials spm (18.vi.2012) GoogleMaps .

Remarks: See below.