The Annelid Community of a Natural Deep-sea Whale Fall off Eastern Australia Author Georgieva, Magdalena N. Life Sciences Department, Natural History Museum, London, United Kingdom & Univ. Brest, CNRS, Ifremer, UMR 6197 Biologie et Ecologie des Ecosystèmes marins Profonds, Plouzané, France Author Wiklund, Helena Life Sciences Department, Natural History Museum, London, United Kingdom & Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden & Gothenburg Global Biodiversity Centre, Gothenburg, Sweden Author Ramos, Dino A. Life Sciences Department, Natural History Museum, London, United Kingdom & University of Grenada, Grenada, Spain Author Neal, Lenka Life Sciences Department, Natural History Museum, London, United Kingdom Author Glasby, Christopher J. Australian Museum Research Institute, Australian Museum, Sydney, Australia & Natural Sciences, Museum and Art Gallery of the Northern Territory, Darwin, Australia & Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Australia Author Gunton, Laetitia M. Australian Museum Research Institute, Australian Museum, Sydney, Australia text Records of the Australian Museum 2023 Rec. Aust. Mus. 2023-05-17 75 3 167 213 http://dx.doi.org/10.3853/j.2201-4349.75.2023.1800 journal article 294462 10.3853/j.2201-4349.75.2023.1800 5abdbce6-7919-4ea6-910e-19ccb5c21493 2201-4349 10414191 32014E75-6253-41C0-BEDC-7A461321A0A1 Phascolosoma undes. sp. Fig. 31 Sipuncula fam. gen. spp. Gunton et al ., 2021: 156 Material examined . NHMUKANEA 2022.405 , AM W.52201 , AMW .52202 , AMW .52203, IN2017_V03_100; 9 June 2017 ; off Byron Bay , NSW, Australia , beam trawl, start: 28.05°S 154.08°E, 999 m, end: 28.10°S 154.08°E , 1013 m . DNA vouchers: NHMUKANEA 2022.405 ( COI , 16 S , 18 S ) , AMW .52201 (18S) , AMW .52202 (18 S ) , AM W.52203 (16 S , 18 S ) . Description . Specimens AMW.52201, AMW.52202 and AM W.52203 all in poor condition, only two small anterior fragments (max. 4 mm length) and one posterior fragment remaining ( Fig. 31A–B ), thus morphological description is very difficult. Small papillae onoutside ofbody. No tentacles, introvert hooks, mouth or nephridiopores observed. Distribution . IN2017_V03, Station 100. Pilot whale carcass, off Byron Bay, New South Wales , Australia in 999–1013 m . Remarks . Bayesian analysis of combined dataset of COI, 16S and 18S sequence data revealsthat our species isa sister group to Phascolosoma ( Phascolosoma ) turnerae Rice, 1985 although support is low (pp 0.5) ( Fig. 32 ); average COI pairwise genetic distance between the two species is 26.7% (Table S19). In our analysis Phascolosoma sp. and all other Phascolosoma species , except Phascolosoma capitatum Gerould, 1913 , are recovered as a poorly supported clade (pp. 0.5). This result partly agrees with Bayesian analysis on four genes (18S, 28S, H3 and COI) in Schulze, Cutler, & Giribet (2007), where all species of Phascolosoma except P. capitatum and P. turnerae formed a monophyletic group. Interestingly P. turnerae is also a deep-water species described from 366–1184 m associated withsubmerged wood ( Rice, 1985 ), whereasallother species of Phascolosoma except for P. capitatum are shallow-water species. Due to the poor morphological condition of the specimens the species is not formally described here.