Duplominona macrodon Curini-Galletti n. sp.

(Fig. 9)

Holotype. Gulf of Panama: Iguana Island (Lat. 7°37’43.29”N; Lon. 80°0’0.32”W), at a depth of about 5 m, in medium coarse sand, march 2016, one whole mount (USNM 16225600).

Other material. Same data as holotype, one specimen observed alive, and prepared as semi-permanent mount (Fig. 9 H).

Etymology. The specific epithet refers to the large size of the spines of the copulatory organ of the new species.

Description. A medium-sized, stout Duplominona, about 2 mm long. Cephalic end with oily dots, and rodshaped rhabdoids. Caudal end pointed. Pharynx just behind midbody (Fig. 9 A, E).

Male genital system. With about 16 testes in two parallel rows. Copulatory organ ovoid, lined by a very thin muscular layer. Cirrus small, formed by a single girdle of few (13–15) large to very large spines, 8–18 μm long. Spines vary in shape from triangular to almost needle-like (Fig. 9 C, D, F, H). Accessory organ ovoid, 32–35 μm across, with a small stylet about 12 μm long. Accessory organ pore very close to female pore.

Female genital system. Ovaria and vitellaria as in previous species. With a spherical bursa, close to the copulatory organ, and provided with a large vaginal pore (Fig. 9 B, G: v).

Diagnosis. Species of Duplominona with a single girdle of large spines, 8–18 μm long, triangular to needleshaped.