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FIGURE 3 in Two new species of Ancistrosyllis McIntosh, 1878 (Annelida: Pilargidae) from the Gulf of Thailand, Western Pacific

FIGURE 3. SEM micrographs of Ancistrosyllis eidimtaiteae sp. nov. (PSUZC-POL-0306) show A. Anterior region, lateral view; B. Anterior end, dorsal view; C. Prostomium, frontal view. Abbreviations: dc, dorsal cirrus; la, lateral antenna; ma, median antenna; nh, notopodial hook; tc, tentacular cirri; vc, ventral cirrus; vpp, ventrolateral palpal papilla.

FIGURE 1 in Two new species of Ancistrosyllis McIntosh, 1878 (Annelida: Pilargidae) from the Gulf of Thailand, Western Pacific

FIGURE 1. Sampling sites in the Gulf of Thailand, showing stations where two new species of Ancistrosyllis, Ancistrosyllis eidimtaiteae sp. nov. (triangles) and A. suksani sp. nov. (squares) were collected.

FIGURE 5 in Two new species of Ancistrosyllis McIntosh, 1878 (Annelida: Pilargidae) from the Gulf of Thailand, Western Pacific

FIGURE 5. Line drawings of Ancistrosyllis eidimtaiteae sp. nov. A. Anterior end, dorsal view; B. Close up, parapodia, ventral view; C. Close up, tip of non-limbate capillary, lateral view. Abbreviations: dc, dorsal cirrus; la, lateral antenna; ma, median antenna; nh, notopodial hook; nlc, non-limbate capillary; pa, palp; tc, tentacular cirri; vc, ventral cirrus.

FIGURE 2 in Two new species of Ancistrosyllis McIntosh, 1878 (Annelida: Pilargidae) from the Gulf of Thailand, Western Pacific

FIGURE 2. Light photographs of Ancistrosyllis eidimtaiteae sp. nov. (A, C. Holotype, PSUZC-POL-0305; B, D, F. PSUZC-POL-0307; E. PSUZC-POL-0308) A. Anterior region, dorsal view; B. Close up anterior, dorsal view; C. Brown papillae on the ventral region, ventral view; D. Oocytes in body, dorsal view; E. Anterior region, lateral view; F. Close up of oocytes, dorsal view. Abbreviations: dc, dorsal cirrus; nc, neurochaetae; nh, notopodial hook; tc, tentacular cirrus.

FIGURE 8 in Two new species of Ancistrosyllis McIntosh, 1878 (Annelida: Pilargidae) from the Gulf of Thailand, Western Pacific

FIGURE 8. SEM micrographs of Ancistrosyllis suksani sp. nov. show A. Close up anterior neuropodia, lateral view; B. Short chaetae at lower acicular lobe, ventral view; C. Close up tip of short stout falcate chaeta, lateral view; D. Close up tip of short limbate chaeta, lateral view; E. Close up tip of long non-limbate chaeta. Abbreviations: dc, dorsal cirrus; nlc, non-limbate capillary chaeta; slc, short limbate chaeta; ssc, short stout falcate chaeta; vc, ventral cirrus.

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Subspecies and Distribution. D.c.capensisGray,1828—distinctpopulationsalongWcoastofNorthandSouthAmerica,theEcoastofSouthAmerica,WAfrica,andtheWPacificOceanfromSJapanandKoreatoNTaiwanandinNewZealand. D. c. tropicalis van Bree, 1971 — coastal Indo-Pacific Ocean from E & S Africa to S China and W Taiwan, including Red Sea, Persian Gulf, and Gulf of Thailand. in Delphinidae

Subspecies and Distribution. D.c.capensisGray,1828—distinctpopulationsalongWcoastofNorthandSouthAmerica,theEcoastofSouthAmerica,WAfrica,andtheWPacificOceanfromSJapanandKoreatoNTaiwanandinNewZealand. D. c. tropicalis van Bree, 1971 — coastal Indo-Pacific Ocean from E & S Africa to S China and W Taiwan, including Red Sea, Persian Gulf, and Gulf of Thailand.

FIGURE 14 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 14. Habitat of Dipolydora vietnamita sp. nov. (in life). A–C, worm burrows in a shell of the date mussel Lithophaga sp. which, in turn, have perforated the shell of an oyster. Arrow showing pygidium of a worm inside burrow. Scale bar: A–C = 1 mm.

FIGURE 12 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 12. Dipolydora vietnamita sp. nov. morphometric relationships. A, caruncle length and anterior position of gizzardlike structure versus total number of chaetigers. B, last branchiate chaetiger versus total number of chaetigers. Correlation coefficients (r) and their significance are reported in Table 1.

FIGURE 11 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 11. Morphology of Dipolydora vietnamita sp. nov. (formalin-fixed paratypes stained with methylene green). A, anterior end, dorsal view, showing unusual pattern of MG staning on anterior chaetigers. B, chaetigers 3–12, ventral view, showing transverse bands of MG staining on chaetigers 6–11. C, middle chaetigers, dorsal view. D, E, posterior end in left lateral (D) and rear (E) view. F, general dorsal view, showing common absence of MG staining on dorsal side of anterior chaetigers. G, anterior fragment, left lateral view, showing MG staining on peristomium, ventral side of chaetigers 6–11, and of glandular pouches in lateral side from chaetiger 12 onwards. H, chaetiger 5, right side in ventral view. Abbreviations: ch5, ch11 = chaetigers 5, 11; co = bilimbate companion chaetae; fa = heavy falcate spines; su = dorsal superior capillaries; ve = ventral capillaries. Scale bars: A–E = 100 µm; F, G = 200 µm, H = 20 µm. A, B, E, G, H—MIMB 42724; C, F—MIMB 42728; D—MIMB 42723.

FIGURE 10 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 10. Morphology of Dipolydora spinosa sp. nov. (formalin-fixed paratypes stained with methylene green). A, middle part of body from chaetiger 14 onwards, dorsal view, showing beginning of dorsal staining from chaetiger 15. B, middle chaetigers, dorsal view. C, anterior end, ventral view, showing stained transverse bands on chaetigers 7–13. D, anterior end, dorsal view (head in frontal view), showing MG staining of foregut. E, middle female chaetigers, dorsal view, showing dorsal terminal parts of nephridia. Abbreviations: ch5, ch15 = chaetigers 5, 15; ne = nephridium. Scale bars: A–E = 100 µm. A, C, E—MIMB 42714; B, D—MIMB 42719.

FIGURE 7 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 7. Morphology of Dipolydora spinosa sp. nov. A–D, anterior ends: A, left lateral view; B, D, ventral view; C, dorsal view. E–G, posterior ends: E, left lateral view; F, dorsal view; G, dorso-lateral view. H, notopodia of posterior chaetigers with capillary chaetae and awl-like spines. Abbreviation: an = occipital antenna, ch5 = chaetiger 5. Scale bars: A–D = 300 µm; E–G = 200 µm; H = 50 µm. A–F—holotype MIMB 42721, in life; G, H—paratype MIMB 42720, in life.

FIGURE 6 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 6. Dipolydora spinosa sp. nov. morphometric relationships. A, caruncle length and anterior position of gizzard-like structure versus total number of chaetigers. B, last branchiate chaetiger and anterior position of notopodial awl-like spines versus total number of chaetigers. Correlation coefficients (r) and their significance are reported in Table 1.

FIGURE 5 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 5. Morphology of Dipolydora spinosa sp. nov. (in life). A, B, anterior end, dorsal view. C, middle chaetigers, dorsal view, showing gizzard-like structure. D, gizzard-like structure, dorsal view, showing grain-like structures in the wall. Abbreviation: ch5 = chaetiger 5; gi = gizzard-lile structure. Scale bars: A–C = 200 µm; D = 50 µm. A, C, D—41-chaetiger individual; B—70-chaetiger individual. A–D—MIMB 42719.

FIGURE 3 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 3. Morphology of Dipolydora echinata sp. nov. (formalin-fixed holotype MIMB 42702 stained with methylene green). A, posterior end, dorsal view. B, notopodia of posterior chaetiger with thin protruding capillary chaetae and thick embedded awl-like spines. C, pygidium, dorsal view. Scale bars: A–C = 50 µm.

FIGURE 8 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 8. Morphology of Dipolydora spinosa sp. nov. A–F, chaetiger 5 chaetae: A, C, bilimbate companion chaetae; B, D, falcate spines in lateral view; E, ventral capillary chaeta; F, dorsal superior geniculate capillary chaeta. G, H, neurochaetae from chaetiger 7: G, inferior winged capillary chaeta; H, bidentate hooded hook. I, J, neurochaetae from a posterior most chaetiger: I, inferior hair-like capillary chaeta; J, bidentate hooded hook. K, L, notochaetae from a posterior most chaetiger: K, three awl-like spines with basal part blunt; L, capillary chaeta. M, octad of spermatids (one below is not visible). Scale bars: A–J, K, L = 20 µm; M = 5 µm. A–J—MIMB 42714; K–M—MIMB 42715.

FIGURE 2 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 2. Morphology of Dipolydora echinata sp. nov. A, anterior end, dorsal view. B–H, chaetiger 5 chaetae: B, D, bilimbate companion chaetae; C, E, F, falcate spines in lateral view (C, F) and in rear view (E); G, ventral capillary chaeta; H, dorsal superior geniculate capillary chaeta. I, J, neurochaetae from chaetiger 7: I, inferior winged capillary chaeta; J, bidentate hooded hook. K, L, neurochaetae from a posterior most chaetiger: K, inferior hair-like capillary chaeta; L, bidentate hooded hook. M–O, notochaetae from a posterior most chaetiger: M, partially developed awl-like spine with basal part blunt; N, fully developed awl-like spine with basal part pointed; O, capillary chaeta. P, tetrad of spermatids. Scale bars: A = 100 µm; B–O = 20 µm; P = 5 µm. A–P—MIMB 42701.

FIGURE 9 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 9. Morphology and reproduction of Dipolydora spinosa sp. nov. (in life). A, complete female, left lateral view, palps missing. B, anterior end, dorsal view, palps missing. C, a part of a brood laid by female inside its burrow in the shell, showing egg capsules joined in a string and containing trochophores. D, trochophores and abortive eggs from the capsules shown on C. Abbreviations: ab = abortive eggs; mo = mouth. Scale bars: A = 500 µm; B, C = 300 µm; D = 30 µm. A, B—paratype MIMB 42720; C, D—egg capsules deposited by holotype MIMB 42721.

FIGURE 1 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 1. Maps showing sampling locations in the Gulf of Thailand and South China Sea (A) and Nha Trang Bay (B).

FIGURE 4 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 4. Morphology of Dipolydora spinosa sp. nov. (formalin-fixed 41-chaetiger paratype MIMB 42719 stained with methylene green). A, anterior end, dorsal view. B, chaetigers 10–20, dorsal view, showing remains of larval pigmentation and pattern of MG staining. Abbreviations: ch10, ch20 = chaetigers 10 and 20; dl = dorso-lateral melanophores; do = dorsal paired melanophores; la = lateral melanophores; me = median vesiculate melanophores. Scale bars: A, B = 50 µm.

FIGURE 13 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 13. Morphology of Dipolydora vietnamita sp. nov. A–F, chaetiger 5 chaetae: A, C, bilimbate companion chaetae; B, D, falcate spines in lateral view; E, ventral capillary chaeta; F, dorsal superior geniculate capillary chaeta. G, H, neurochaetae from chaetiger 7: G, inferior winged capillary chaeta; H, bidentate hooded hook. I, J, neurochaetae from a posterior most chaetiger: I, inferior hair-like capillary chaeta; J, bidentate hooded hook. K, tetrad of spermatids. Scale bars: A–J = 20 µm; K = 5 µm. A–K—MIMB 42724.