Duplominona uniserta 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

Duplominona uniserta Curini-Galletti n. sp.

( Fig. 8 )

Holotype. Pacific Ocean: Gulf of Panama, off Isla Pacheca (Las Perlas Is., Panama)(Lat. 8°39’44.40”N; Lon. 79° 2’56.38” W), at a depth of about 4 m, shell hash, December 2011: one whole mount ( USNM 1622599 ).

Etymology. The specific epithet refers to the morphology of the copulatory organ of the new species, provided with a single girdle (lat. sertum) of spines.

Description. A very slender species, about 2 mm long. Cephalic end with dot-shaped rhabdoids, and few clusters of long rhabdoids, also present in the pointed tail. With a short pharynx in front of midbody ( Fig. 8 E ).

Male genital system. With three testes in one row. With an extremely elongate seminal vesicle, about 200 μm long, provided with a thin muscular lining ( Fig. 8 B, F : sv). Cirrus about 50 μm long, naked for most of its length, distally provided with one single girdle of seven spines, 3–5 μm long, distinctly hook-shaped, with a broad basis ( Fig 8 C, D, G ).

Accessory organ spherical, with a stylet 23 μm long. It opens to the outside with a pore nearly halfway between male and 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, surrounded by glands ( Fig 8 B ).

Diagnosis. Species of Duplominona with a very elongate seminal vesicle and a single girdle of hook-shaped spines, 3–5 μm long.

Figures

FIGURE 8. Duplominona uniserta n. sp. (A) Habitus of a living animal; see Fig. 2 A 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, F) Micrograph of the living animal. (G) Micrograph of the cirrus; distal opening to the right (Scale bars: C, D, G = 10 μm; E = 100 μm; F = 50 μm).