New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama Author Curini-Galletti, Marco Dipartimento di Medicina Veterinaria, Università di Sassari, Sassari, Italy Author Carcupino, Marcella Dipartimento di Medicina Veterinaria, Università di Sassari, Sassari, Italy & carcupin @ uniss. it; https: // orcid. org / 0000 - 0002 - 0484 - 3043 Author Stocchino, Giacinta A. Dipartimento di Medicina Veterinaria, Università di Sassari, Sassari, Italy & stocchin @ uniss. it; https: // orcid. org / 0000 - 0002 - 7005 - 208 X Author Leasi, Francesca Department of Biology, Geology and Environmental Sciences, University of Tennessee at Chattanooga, USA francesca-leasi @ utc. edu; https: // orcid. org / 0000 - 0001 - 6995 - 0934 Author Norenburg, Jon L. Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA NORENBUR @ si. edu; https: // orcid. org / 0000 - 0001 - 7776 - 1527 text Zootaxa 2020 2020-11-20 4881 3 482 498 journal article 9528 10.11646/zootaxa.4881.3.3 56a43dc1-9576-49d5-8650-255e66c48add 1175-5326 4283896 8A41020C-A131-4163-B3C6-D3398647EB4B 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.