Isotriphora sp. 1

Figs 6, 23I, 52

Material examined

BRAZIL – Fernando de Noronha Archipelago • 2 specs; Cabeço da Sapata; depth 40 m; 5 Dec. 1985; M. Cabeda leg.; MORG 52611 * • 2 specs; Cabeço da Sapata; 03º52′41″ S, 32º29′04″ W; depth 45 m; 6 Sep. 2013; in rhodolit beds; ZUEC-GAS 7353 • 1 spec.; Cabeço da Sapata; 03º52′41″ S, 32º29′04″ W; depth 45 m; 6 Sep. 2013; in rhodolit beds; ZUEC-GAS 7489 .

Remarks

The incomplete shells of Isotriphora sp. 1 are easily differentiated from those of the sympatric I. uncia sp. nov. by the presence of brown axial patches (Fig. 6 A–B, E–F) and an earlier emergence of the median spiral cord, rapidly enlarging and reaching the same size of other cords (Fig. 6C). The most similar species to Isotriphora sp. 1 is “ Inella ” maculata Fernandes & Pimenta, 2019, from southeastern Brazil, which has a different protoconch. Complete shells of Isotriphora sp. 1 are required to formally describe this species.

Geographical distribution

Brazil: Fernando de Noronha.

Bathymetric distribution

Depth: 40– 45 m.