Biodiversity of intertidal marine flatworms (Polycladida, Platyhelminthes) in southeastern Australia Author Rodríguez, Jorge 0000-0003-4242-6053 Author Hutchings, Pat A. 0000-0001-7521-3930 Author Williamson, Jane E. 0000-0003-3627-4508 text Zootaxa 2021 2021-08-23 5024 1 1 63 http://dx.doi.org/10.11646/zootaxa.5024.1.1 journal article 10.11646/zootaxa.5024.1.1 1175-5326 5258775 81B95F8A-43CD-4273-8F25-5AC5405AC1C9 Diposthus popeae Hyman, 1959 ( Fig. 20 ) Diposthus popeae Hyman, 1959: 15 , figs 19–21. Material examined : One specimen sagittally sectioned. AM W.53209 (5 slides). A specimen was collected at low tide under rocks from Australia , New South Wales , Bottle & Glass , 33°50’53.9”S , 151°16’12.3”E . Coll. Jorge Rodriguez and Justin McNab , October 25 th , 2019 . Additional material from Australia , New South Wales , Long Reef from the collections of the Australian Museum : AM W.3699 ( holotype ), W. 3700 . Remarks: Hyman (1959) remarks the poor condition of the preserved specimen in the original description and the difficulties of reconstructing the male copulatory system. Based on the studied specimen from Bottle & Glass, Diposthus popeae Hyman, 1959 possesses a slender body shape with white dorsal colouration and a pair of pseudotentacles in the anterior margin ( Fig. 20A, B, D ). Internally, the gonopores lie very close together, the male copulatory system is directed perpendicularly and consists of a thick and enlarged seminal vesicle and a long and slender penis papilla ( Fig. 20C, E, F ). The type and only other species of the genus, D. corallicola Woodworth, 1898 , from the Great Barrier Reef appears to have prostate tissue in a fold adjacent to the penis papilla and separate from the rest of the male copulatory system. In the studied specimen of D. popeae such organ cannot be found; instead, it appears the glandular function is carried out by the penis itself, having glandular tissue ( Fig. 20F ) similar to the case of the ejaculatory duct of Tripylocelis typica Haswell, 1907 . The female system consists of a vertically running vagina externa that turns posteriorly after connecting with the vagina interna and is provided with a circular Lang’s vesicle. A pair of cement pouches are also present ( Fig. 20F ). Distribution: Australia , New South Wales , Long Reef ( Hyman 1959 ).