Review of Orbiniidae (Annelida, Sedentaria) from Australia Author Zhadan, Anna text Zootaxa 2020 2020-10-14 4860 4 451 502 journal article 8231 10.11646/zootaxa.4860.4.1 1f5ee6c2-2635-44a8-8469-49319b7a8c62 1175-5326 4414137 876F1085-5296-4340-A951-41420C011917 Proscoloplos cygnochaetus Day, 1954 Figure 25 Proscoloplos cygnochaetus Day, 1954: 21 , fig. 3a–f; 1967: 538, fig. 23.1e–g; Meyer et al. 2008: 879–889 , fig. 1; Blake 2017: 118–120 , fig. 58a–f. Proscoloplos confusus: Hartmann-Schröder 1962: 133–134 , figs. 161–164. Proscoloplos bondi: Kelaher & Rouse 2003: 909–917 , fig. 2. Material examined. Western Australia : King George Sound , Vancouver Peninsula , near Mistaken Island , 35°04’S , 117°56’E , 13.12.1983 , intertidal, coll. H.E. Stoddart , AM W.23614, 6 specimens . New South Wales : Ben Buckler rocks at north end of Bondi Beach , coralline algal turf, 29.05.2000 , coll. G. Rouse , 33°53’42”S , 151°16’48”E , AM W.29015, paratypes of P. bondi , 7 specimens . Type locality. Tristan da Cunha . Description. Body width 150–300 µm , length 2–3 mm , 22–38 chaetigers ( Fig. 25A, C ). Prostomium round, without eyes, two peristomial segments ( Fig. 25 A–D). Transition from thorax to abdomen indistinct. Branchiae from chaetiger 6–8, oval, same length as notopodia or slightly longer ( Fig. 25A, B ). Notopodial postchaetal lobes digitiform, increasing towards posterior ( Fig. 25A, D ). Neuropodial lobes short, papilliform, almost disappearing in abdomen ( Fig. 25A ). Notochaetae crenulated capillaries in all segments; neurochaetae crenulated capillaries in all segments, besides swan-shaped chaetae in abdominal segments (starting from chaetiger 6–9) ( Fig. 25B, E ). Pygidium with four short cirri ( Fig. 25A, C ). Distribution (bases on literature). Chile , Argentina , South Africa , Atlantic French coast, Australia , Western Australia , New South Wales . Habitat. Intertidal and upper subtidal, sand, algae. Remarks. Proscoloplos cygnochaetus was described from the South Atlantic Ocean, Tristan da Cunha Island ( Day, 1954 ). Since, this species has been redescribed by Kelaher & Rouse (2003) (as P. bondi ), Meyer et al. (2008) , and Blake (2017) . Meyer et al. (2007) investigated both morphological and molecular data on three Proscoloplos species and concluded that Proscoloplos confusus Hartmann-Schröder, 1962 and Proscoloplos bondi Kelaher & Rouse, 2003 are junior synonyms of P. cygnochaetus . This was accepted by Blake (2017) . The specimens studied here are in agreement with previous descriptions. The present study expands the distribution of P. cygnochaetus to Western Australia.