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FIGURE 10. Phragmatopoma caudata from Brazil, live female. A in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
FIGURE 10. Phragmatopoma caudata from Brazil, live female. A. Anterior end, ventral view; B. Detail of base of operculum showing a pigmented with eyespots median ridge, and median organ absent.
FIGURE 9 in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
FIGURE 9. Median organ and ridge diversity in other Australian sabellariids. A. Lygdamis augeneri, AM W.27564, stained with methylene blue, with conical median organ, eyespots along median ridge; B. Lygdamis giardi, AM W.7958, with conical median organ (MO) and eyespots (white arrow) along median ridge (MR); C. Phalacrostemma maloga, AM W.27567, with a cylindrical and rounded distal end median organ as a prolongation of the median ridge; D. Tetreres terribilis, AM W.4994, lacking median organ, median ridge inconspicuous.
FIGURE 8 in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
FIGURE 8. Median organ and ridge diversity in Australian Idanthyrsus. A. Idanthyrsus australiensis, AM W.201770, with conical median organ (MO), eyespots (white arrow) along median ridge (MR); B. Idanthyrsus sp. cf. I. australiensis AM W.29153, with flattened, triangular median organ; eyespots absent along median ridge; C. Idanthyrsus sp. cf. I. australiensis, AM W.29125 with flattened, triangular median organ, eyespots present along median ridge; D. Idanthyrsus willora, scanning electron micrograph, with inconspicuous median organ.
FIGURE 4. Median organ, Lygdamis nasutus n in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
FIGURE 4. Median organ, Lygdamis nasutus n. sp., paratypes, AM W.44467. A. Lateral view with a close up of the eyespots along its length; B. Details of the distal tip, showing the flat corona; C. Distal end, showing teardrop coronal shape frontal view. D–G. SEM images, AM W.47750. D. Complete median organ, lateral view; E. Distal end, lateral view; F. Detail of the base of median organ with a few sparsely distributed ciliary tufts; G. Close up of ciliary tufts.
FIGURE 7. Chaetae, Lygdamis nasutus n in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
FIGURE 7. Chaetae, Lygdamis nasutus n. sp., paratypes, SEM images, AM W.44467. A. Anterior abdominal uncini with number of rows of teeth provided in one uncinus, close up of distal dentition; B. Detached uncini, with number of rows of teeth provided in one uncinus; C. Posterior abdominal uncini; D. Detail of posterior abdominal uncini; E. Abdominal notopodium; F. Detail of the two types of abdominal notochaetae; G. Posterior abdominal chaetiger and cauda.
FIGURE 1 in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
FIGURE 1. Gesaia sp. SEM images of larva, AM W.47551. A. Dorsal view; B. Dorsolateral view; C. Antero-ventral view; D. Detail of anterior regions showing median organ and palps, dorsal view; E. Same, ventral view; F. Inner row of paleae; G. Nuchal hooks and shafts of paleae from inner row; H. Parathoracic chaetigers, lateral view; I. Notochaetae of parathoracic chaetiger. Abbreviations: br = branchia, mo = median organ, pa = palp.
FIGURE 3. A–D. Lygdamis nasutus n in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
FIGURE 3. A–D. Lygdamis nasutus n. sp., holotype, AM W.47372, preserved. A. Operculum, thoracic and parathoracic chaetigers, lateral view; arrowheads point to notopodial cirri; B. Anterior end, ventral view; C. Same, dorsal view; D. Same, but with exposed well-developed median organ. E–F Paratype AM W.44467. E. Detail of median organ, dorsal view; F. Cross section of paratypes, showing half of the operculum with whole median organ. Abbreviations: br = branchia, bo = building organ, cn1 = cirrus neuropodia segment 1, chn1 = chaetae neuropodium segment 1, dc = dorsal cirrus, es = eyespots, ip = inner paleae, li = lips, m = mouth, mo = median organ, nh = nuchal hook, op = outer paleae, opa = opercular papillae, pa = palp, rtf = row of tentacular filaments, tf = tentacular filaments. Small arrow indicates conical dorsal cirrus. Photo: A–D—E. Wong.
FIGURE 2. Lygdamis nasutus n in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
FIGURE 2. Lygdamis nasutus n. sp., paratype, AM W.47750, live. A. Whole specimen, dorsal view, arrowheads point to notopodial cirri; B. Anterior end, lateral view, with median organ protruding from operculum (arrow); C. Anterior end, dorsal view; D. Operculum, frontal view; E. Posterior abdominal chaetigers and cauda, ventral view. Photos by A. Semenov.
FIGURE 6. Chaetae, Lygdamis nasutus n in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
FIGURE 6. Chaetae, Lygdamis nasutus n. sp., paratypes, SEM images, AM W.44467. A. Operculum, lateral view; B. Outer paleae; C. Thecal sculpture, outer paleae; D. Inner paleae; E. Close up of distal end, inner paleae; F. First thoracic neuropodial chaetae; G. Parathoracic notopodia; H. Parathoracic neuropodium. Abbreviations: cn1 = cirrus neuropodia segment 1, chn1 = chaetae neuropodium segment 1, ip = inner paleae, mo = median organ, nh = nuchal hook, op = outer paleae, opa = opercular papillae, pa = palp.
FIGURE 5. Chaetae, Lygdamis nasutus n in Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
FIGURE 5. Chaetae, Lygdamis nasutus n. sp., paratypes. A. Outer paleae; B. Detail of tips of outer paleae; C. Inner paleae, distal end; D. Notopodium, parathoracic chaetiger; E. Detail of tips of lanceolate parathoracic notopodial chaeta; F. Parathoracic notopodial simple capillaries, interspersed with lanceolate chaetae; G. Neuropodium, parathoracic chaetiger; H. Detail of tips of lanceolate parathoracic neuropodial chaetae; I. Parathoracic neuropodial simple capillaries, interspersed with lanceolate chaetae; J. Abdominal notochaetae (two types); K. Neuropodial abdominal uncini; L. Detail of abdominal uncinus, side view.
FIGURE 23 in Polycirridae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia
FIGURE 23. Polycirrus boholensis, AM W.44955. A–B. Entire worm, dorsal and ventral views (anteriorly), respectively; C–D. Close ups of the anterior end, dorsal and ventral views, respectively; E–F. Progressively higher magnifications of the notochaetae of segment 7, arrows point to tip of notochaeta from anterior row; G. Uncini, mid-abdominal segment. Numbers refer to segments. Abbreviations: ll = lower lip, P = basal part of prostomium, ul = upper lip, * = distal part of prostomium. Scale bars: A–B = 300 µm, C–D = 200 µm, E = 30 µm, F = 15 µm, G = 10 µm.
FIGURE 22. Polycirrus oculeus n in Polycirridae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia
FIGURE 22. Polycirrus oculeus n. sp., holotype NTM W23159. A–B. Entire worm, dorsal and ventral views (anteriorly), respectively, arrow points to the last notopodium; C–F. Progressively higher magnifications of the anterior end, ventral and dorsal views, respectively; G–H. Close ups of the anterior end, dorsal and ventral views, respectively; I. Transition between thorax and abdomen, ventral view; J. Posterior end, left lateral view. Numbers refer to segments. Abbreviations: ll = lower lip, P = basal part of prostomium, ul = upper lip, * = distal part of prostomium. Scale bars: A–B = 0.5 mm, C = 0.3 mm, D–H, J = 0.2 mm, I = 0.15 mm.
FIGURE 16. Polycirrus papillatus n in Polycirridae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia
FIGURE 16. Polycirrus papillatus n. sp., paratype AM W.44622. A–B. Entire worm, left dorso-lateral and ventral views, respectively; C. Thorax, ventral view; D. Posterior end, left lateral view. Scale bars: A–B = 0.4 mm, C = 0.2 mm, D = 0.1 mm.
FIGURE 12. Polycirrus rubrointestinalis n in Polycirridae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia
FIGURE 12. Polycirrus rubrointestinalis n. sp., paratype AM W.47658. A. Entire worm, ventral view; B–C. Close ups of the anterior end, right ventro-lateral and ventral views, respectively; D. Tip of tentacle. Paratype AM W.45457, E–G. Close ups of the anterior end, right ventro-lateral, ventral and right dorso-lateral views, respectively; H. Close up of parapodia of segments 6–7; I. Close up of notopodia of segments 4–5; J. Notochaetae from anterior row, segment 5. Numbers refer to segments; unspecified arrows point to nephridial and genital papillae. Abbreviations: i = inner region of lower lip, ll = lower lip, o = outer region of lower lip, P = basal part of prostomium, ul = upper lip, * = distal part of prostomium. Scale bars: A = 700 µm, B = 75 µm, C–D, F = 100 µm, E = 50 µm, G = 150 µm, H = 30 µm, I = 10 µm, J = 4 µm.
FIGURE 19. Polycirrus cruciformis n in Polycirridae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia
FIGURE 19. Polycirrus cruciformis n. sp., paratype AM W.47664. A. Close up of the thorax, left lateral view, arrow points to last notopodium; B. Close up of parapodia of segments 9–11; C–D. Notopodia, segments 9 and 6–7, respectively; E. Close up of one notopodium of segment 7; F–H. Neuropodia, segments 11, 14 and posterior one, respectively; I–J. Close ups of posterior uncini; K–L. Close ups of one long tentacle, in progressively higher magnifications; M–N. Posterior end, dorsal and left dorso-lateral views, respectively; O. Close up of the pygidium, left dorso-lateral view. Scale bars: A = 60 µm, B = 20 µm, C = 8 µm, D, L = 15 µm, E = 5 µm, F = 3 µm, G = 2 µm, H–J = 1 µm, K = 30 µm, M–N = 40 µm, O = 10 µm.
FIGURE 9. Polycirrus glossochelius n in Polycirridae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia
FIGURE 9. Polycirrus glossochelius n. sp., holotype AM W.47642. A. Posterior end, left lateral view; B–D. Notochaetae, segment 9. E–F. Uncini, segment 18. G–H. Uncini, posterior segment. Scale bars: A = 500 µm, B = 100 µm, C–D = 30 µm, E, G = 20 µm, F, H = 10 µm.
FIGURE 5 in Polycirridae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia
FIGURE 5. Lysilla pacifica, AM W.47520, A. Notochaetae, segment 8. Polycirrus oculeus n. sp., holotype NTM W.23159, B–C. Progressively closer views of the notochaetae of segment 19; D. Uncini, segment 23; E–F. Uncini of two posterior neuropodia. Polycirrus rubrointestinalis n. sp., paratype AM W.47658, G–H. Notochaetae, segments 6 and 12, respectively; I–K. Uncini, segments 6, 12 and 24, respectively. Scale bars: A–B, G = 30 µm, C, H = 20 µm, D–F = 5 µm, I–K = 6 µm.
FIGURE 8. Polycirrus glossochelius n in Polycirridae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia
FIGURE 8. Polycirrus glossochelius n. sp., holotype AM W.47642. A–B. Entire worm, left dorso-lateral and ventral views (anteriorly), respectively; C. Thorax, ventral view; D. Posterior end, left lateral view; E–F. Anterior end, left dorso-lateral and ventral views, respectively; G. Transition between thorax and abdomen, ventral view, arrows point to genital papillae; H–I. Close ups of the anterior end, ventral and left dorso-lateral views, respectively. Numbers refer to segments. Abbreviations: ll = lower lip, ul = upper lip, * = distal part of prostomium. Scale bars: A–B = 1.5 mm, C–F, H–I = 1 mm, G = 0.6 mm.
FIGURE 2. Hauchiella tentaculata n in Polycirridae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia
FIGURE 2. Hauchiella tentaculata n. sp., holotype NTM W.023154. A–B. Entire worm, dorsal and ventral views (anteriorly), respectively; C. Whole body, ventral view (anteriorly); D. Tips of buccal tentacles; E–F. Anterior end with buccal tentacles, ventral and dorsal views, respectively; G–H. Close ups of the anterior end in progressively higher magnifications, ventral view; I. Close up of the anterior end, dorsal view; J. Posterior end. Numbers refer to segments. Abbreviations: ll = lower lip, P = basal part of prostomium; ul = upper lip, * = distal part of prostomium. Scale bars: A–B = 0.6 mm, C, F = 0.4 mm, D = 0.3 mm, E = 0.5 mm, G, J = 0.15 mm, H–I = 0.1 mm.
FIGURE 1. Live specimens. A. Polycirrus rubrointestinalis n in Polycirridae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia
FIGURE 1. Live specimens. A. Polycirrus rubrointestinalis n. sp.; B–C. Polycirrus cruciformis n. sp.; D–E. Polycirrus oculeus n. sp. D, AM W.44612, other specimens not preserved. Scale bars: A, D, E = 0.3 mm, B = 0.2 mm, C = 0.15 mm. All photos by Alexander Semenov.
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