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 Phylo felix Kinberg, 1866 Figures 21 , 22 Phylo felix Kinberg, 1866: 251–252 ; Hartman 1957: 262–265, plate 23, figs. 1–7; Day 1977: 234 ; Blake 2017: 90–93 , figs. 42–43. Orbinia ( Phylo ) felix australis Hartmann-Schröder 1984: 33-34 . Material examined. New South Wales : Cottage Point , Cowan Creek , 33°39’S , 151°10’E , 10.10.2004 , intertidal, under boulders, coll. P.A. Hutchings , J.M. Nogueira , AM W.30718, 1 specimen ; same place, 17.04.2011 , intertidal, Zostera , coll. P.A. Hutchings , AM W.32798, 1 specimen ; east of North Head , Port Jackson , 33°47’50”S , 151°18’57”E , 21.07.1989 , depth 30 m , sand, coll. Fisheries Research Institute ( NSW ), AM W.24306, 1 specimen . Western Australia : Little Grove , Princess Royal Harbour , Albany , 35°04’S , 117°52’E , 22.11.1975 , fine sand with mollusk shells, coll. G. Hartmann- Schröder , AM W.198417, paratypes of O. ( Ph. ) felix australis , 2 specimens . Type locality. Brazil . FIGURE 21. Phylo felix . A–D: AM W.30718, stereomicroscope. A. General view; B. Thorax-abdomen transition, lateral view; C. Anterior end, dorsal view; D. Posterior thoracic chaetigers, lateral view; E–H, AM W.24306, compound microscope. E. Parapodium of chaetiger 17; F. Neuropodium of chaetiger 17; G. Parapodium of chaetiger 23; H. Posterior parapodium. a, acicula; br, branchia; cc, crenulated capillaries; fc, forked chaeta; flc, flail chaeta; ic, interramal cirrus; ne, neuropodium; no, notopodium; ss, spear-like spines; u, uncini. Description . Body long, thorax flattened, abdomen cylindrical; thoracic width 1.6–2.8 mm ( Figs 21A , 22A, E ). Prostomium conical with pointed but not sharp tip ( Figs 21C , 22A, D, E ). Thoracic chaetigers numbering 18–20. Branchiae from chaetiger 5, triangular with tapering tips, in abdomen becoming long triangular and strap-like, shorter than notopodia ( Figs 21C, E, G, H , 22A, B, D, F ). Thoracic notopodial postchaetal lobes developed from first chaetiger, digitate to narrow foliaceous; in abdomen becoming very long, foliaceous, in posterior segments narrow, cirriform ( Figs 21C, E, G, H , 22A, B, D, F ). Thoracic neuropodial postchaetal lobes as ridge with up to 8 papillae; subpodal papillae present from chaetigers 13–18 to 21–24, up to 14 per parapodia; in larger specimens reaching midventral line in 3–4 segments ( Figs 21B, D, E, F , 22B, C, E ). Abdominal neuropodia bilobed, with subequal lobes or outer lobe slightly larger; subpodal flange well developed, with long papilla (ventral cirrus) ( Figs 21G, H , 22F ). Interramal cirrus present, longer than neuropodia, starting from last 3–4 thoracic segments ( Figs 21E, G, H , 22B, F ). Pygidium with two anal cirri ( Fig. 21A ). Notopodial chaetae crenulate capillaries, in abdominal notopodia also forked chaetae present ( Fig. 21G, H ). Thoracic neuropodia bearing 3–4 rows of curved smooth uncini and few thin capillaries in posterior row; beginning from chaetiger 12–13 in anterior row very thick dark straight spear-like spines present, up to 7 spines per parapodia ( Figs 21 D-F, 22A, D). Abdominal neuropodia bearing capillary chaetae; both rami supported by thin straight aciculae in abdomen ( Fig. 21G, H ). Distribution. (based on literature). Brazil , Patagonia, Gulf of Mexico, Pacific coast of South America, Gulf of California, Antarctica , Japan , New Zealand , Australia ( Queensland , New South Wales , Victoria , Western Australia ). Habitat. Intertidal and upper subtidal, sand, shells, seagrass. Remarks . Phylo felix was described from Brazil , after which it was recorded from around the Pacific, including the coast of South America, Gulf of California, Japan , New Zealand , and Antarctica (Hartman, 1957; Day, 1977 ; Blake 2017 ). The subspecies Orbinia ( Phylo ) felix australis was described from Western Australia. It differs from the nominal species owing to the following characteristics: modified spines starting from chaetiger 13 instead of 11; subpodal papillae present after chaetiger 20, usually they cover chaetiger 22–25 instead of 17–20; and interramal cirri starting from the last 3–7 thoracic chaetigers instead of 2. According to these characters, the specimens investigated in the present work are similar to the subspecies Orbinia ( Phylo ) felix australis , but demonstrate an intermediate state in some specimens. For example, the modified chaetae start from chaetiger 12, the subpodal papillae extend to chaetiger 21, and there are 3 thoracic segments with interramal cirri. This indicates an absence of a clear border between the nominal species and Ph. felix australis . The validity of this and other subspecies should be confirmed by careful investigations of morphological and/or molecular characters.