Duplominona macrodon Curini-Galletti, 2020

Curini-Galletti, Marco, Carcupino, Marcella, Stocchino, Giacinta A., Leasi, Francesca & Norenburg, Jon L., 2020, New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama, Zootaxa 4881 (3), pp. 482-498 : 493-494

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.

Figures

FIGURE 9. Duplominona macrodon n. sp. (A) Habitus of a living animal; see Fig. 2A for interpretation of anatomical features. (B) General topography of the genital organs from a living animal. (C) Reconstruction of the cirrus. (D) Spine morphology. (E) Micrograph of a living animal. (F, G) Micrographs of the cirrus (F) and the genital area (G) from holotype. (H) Micrograph of the cirrus from semipermanent mount. (Scale bars: C, D = 5 μm; E = 250 μm; F, H = 10 μm; G = 50 μm).