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FIGURE 3. A–B in Deep-water Thyasiridae (Mollusca: Bivalvia) from the Oman Margin, Arabian Sea, new species and examples of endemism and cosmopolitanism

FIGURE 3. A–B, Channelaxinus aff. excavatus, Oman margin; C–D, C. excavatus (Dall), holotype, United States National Museum 107449; E–F, C. adelaideana (Iredale), holotype, Australian Museum, C32091; G, C. perplicata (Salas) as Cryptodon plicatus reproduced from Verrill & Bush, 1898; H–I, C. benthicola (Iredale), holotype, Australian Museum C47714.

FIGURE 2. A–C in Deep-water Thyasiridae (Mollusca: Bivalvia) from the Oman Margin, Arabian Sea, new species and examples of endemism and cosmopolitanism

FIGURE 2. A–C, Thyasira anassa sp. nov. Holotype: A–B, external and internal of the left valve; C, gross anatomy viewed from the right side and right mantle removed; D–E, Channelaxinus investigatoris Smith, off Sri Lanka, National Museum of Wales, NMWZ 1955.158.11399; F–H, Thyasira acuticarinata Smith, reproduced from Annandale & Stewart, 1909. aa, anterior adductor muscle; au, auricle; aus auricular sinus; f, foot; id, inner demibranch; lbp, lateral body pouch; lun, lunule; me, mantle edge; od, outer demibranch; pa, posterior adductor muscle; ps, posterior sulcus; psn, posterior sinus; sms, submarginal sulcus; smsn, submarginal sinus.

FIGURE 4. A in Deep-water Thyasiridae (Mollusca: Bivalvia) from the Oman Margin, Arabian Sea, new species and examples of endemism and cosmopolitanism

FIGURE 4. A, Axinulus aff. croulinensis, Oman margin; B, Axinulus croulinensis Jeffreys, Loch Fyne, 40 m, Scotland, National Museum Wales; C, Axinulus undescribed, Gulf of Mexico, National Museum Wales; D, A. brevis Verrill & Bush, Rockall Trough, 1595 m, National Museum Wales; E–F, Mendicula aff. ferruginosa, Oman margin; G–H, Mendicula ferruginosa Forbes, Rockall Trough, 1595 m, National Museum Wales; I, Leptaxinus indusarium Oliver & Levin, holotype, National Museum Wales, NMWZ.2005.34.1.

FIGURE 1. A–E in Deep-water Thyasiridae (Mollusca: Bivalvia) from the Oman Margin, Arabian Sea, new species and examples of endemism and cosmopolitanism

FIGURE 1. A–E, Parathyasira bamberi sp. nov. Holotype: A–B, external and internal of the right valve; C–D, scanning electron micrographs of the microsculpture; E, gross anatomy viewed from the right side and right mantle removed; F, Parathyasira resupina Iredale, holotype, Australian Museum, C57834; G, Parathyasira granulosa Monterosato, Gulf of Cadiz, National Museum Wales; H, Parathyasira subcircularis Payne & Allen, Rockall Trough, 1595 m, National Museum Wales. aa, anterior adductor muscle; f, foot; hg, hind gut; id, inner demibranch; k, kidney; lbp, lateral body pouch; lig, ligament; lp, labial palps; lun, lunule; me, mantle edge; od, outer demibranch; pa, posterior adductor muscle; r, rectum; sms, submarginal sulcus.

FIGURE 33 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURE 33. Thyasira falklandicum, South Orkney Island, Antarctica, 244–344m, NMW.Z. 2005.4.4, Gross anatomy after removal of right mantle.

FIGURES 1–4. Thyasira methanophila new species. Holotype. MNHNCL 201646 Live collected specimen. Figs 1 & 4 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 1–4. Thyasira methanophila new species. Holotype. MNHNCL 201646 Live collected specimen. Figs 1 & 4 external and internal of right valve; Figs 2 & 3 external and internal of left valve.

FIGURES 5–10. Thyasira methanophila new species. Paratypes. MNHNCL 201648 and NMW.Z. 2005.4.2. Figs 5–7 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 5–10. Thyasira methanophila new species. Paratypes. MNHNCL 201648 and NMW.Z. 2005.4.2. Figs 5–7 disarticulated valves showing variation in outline; Fig. 8 oblique view of part of escutcheon; Fig. 9 internal view with adductor muscle and pallial scars artificially highlighted. Fig. 10 right valve of specimen used for anatomical study.

FIGURES 16–22 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 16–22. Thyasira methanophila new species. Scanning electron micrographs of the ctenidium and filaments. Fig. 16 posterior portion of a demibranch, longitudinal oblique view; Fig. 17 frontal view of filaments on the exterior surface; Fig. 18 frontal view of filaments on interior surface; Fig. 19 oblique view of bacteriocyte zone of filaments with cut transverse section; Fig. 20 transverse section of one half of a filament showing open bacteriocytes; Fig. 21 polygonal surfaces of bacteriocytes; Fig. 22 ruptured bacteriocyte showing bacteria. Black arrows indicate features. white arrows indicate links between images.

FIGURES 23–26. Maorithyas marama Fleming, 1950 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 23–26. Maorithyas marama Fleming, 1950, Sylvan Cove Stewart Island, New Zealand, 7 m. NMNZ M026537. Figs 23 & 26 external and internal views of right valve; Figs 24 & 25 external and internal views of left valve. FIGURES 27–29. Dorsal views of left valves to show variation in escutcheon development. Fig. 27 T. methanophila; Fig. 28 T. (M.) marama; Fig. 29 T. falklandicum.

FIGURES 30–32 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 30–32 Maorithyas marama Bradshaw Sound, Fjordland, New Zealand, 90m. NMNZ M179679. Gross anatomy. Fig. 30 View after removal of right mantle; Fig. 31 View after removal of right ctenidium; Fig. 32 View after removal of right lateral body pouch and revealing alimentary system.

FIGURES 14–15. Thyasira methanophila new species. Gross anatomy. Fig. 14 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 14–15. Thyasira methanophila new species. Gross anatomy. Fig. 14 View after removal of right ctenidium. Fig. 15 View after removal of right lateral body pouch and exposing alimentary system.

FIGURES 11–13. Thyasira methanophila new species. Gross anatomy. Fig. 11 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 11–13. Thyasira methanophila new species. Gross anatomy. Fig. 11 View after removal of right mantle; Fig. 12 View of right mantle and adductor muscles showing pallial blood vessel; Fig. 13 oblique ventral view showing fleshy ctenidia and swollen lateral body pouches. Abbreviations as listed in appendix.

FIGURES 43–45 in New species of Thyasiridae from a methane seepage area off Concepción, Chile

FIGURES 43–45. Conchocele sp. indet. Station AGT 6, northwest off the Bay of Concepción, southcentral Chile; 36°22.15 S, 73°42.85 W; 780m depth, Coll. J. Sellanes & NMW.Z.2005.4.5.

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Рис. 2. Распространение Acharax johnsoni (Dall, 1891) (желтый круг – рецентные раковины, голубой круг – живаЯ особь) и Conchocele bisecta (Conrad, 1849) (красный квадрат) в Беринговом море [Кафанов, Лутаенко, 1997; Данилин, 2014; Coan et al., 2000; наши данные]. Данные по нахождению C. bisecta приблиЗительные (широта – 57° N, долгота –?) [Coan et al., 2000]. in Clarification of data on findings of rare species of bivalve mollusks Acharax johnsoni (Dall, 1891) (Solemyidae) and Conchocele bisecta (Conrad, 1849) (Thyasiridae) in the Far Eastern seas of Russia

Рис. 2. Распространение Acharax johnsoni (Dall, 1891) (желтый круг – рецентные раковины, голубой круг – живаЯ особь) и Conchocele bisecta (Conrad, 1849) (красный квадрат) в Беринговом море [Кафанов, Лутаенко, 1997; Данилин, 2014; Coan et al., 2000; наши данные]. Данные по нахождению C. bisecta приблиЗительные (широта – 57° N, долгота –?) [Coan et al., 2000].

Figure 7 from: Valentich-Scott P, Powell II CL, Lorenson TD, Ewards BE (2014) A new genus and species of Thyasiridae (Mollusca, Bivalvia) from deep-water, Beaufort Sea, northern Alaska. ZooKeys 462: 11-26. https://doi.org/10.3897/zookeys.462.6790

Figure 7 - Comparison of adductor muscle scars and pallial lines of left valves of holotypes. A Maorithyas marama, holotype B Wallerconcha sarae, holotype C Spinaxinus sentosus, holotype. – Not to scale.

Figure 6 from: Valentich-Scott P, Powell II CL, Lorenson TD, Ewards BE (2014) A new genus and species of Thyasiridae (Mollusca, Bivalvia) from deep-water, Beaufort Sea, northern Alaska. ZooKeys 462: 11-26. https://doi.org/10.3897/zookeys.462.6790

Figure 6 - A–H Maorithyas hadalis, holotype, NSMT 71431, length = 26.7 mm, height = 24.1 mm, width = 13.4 mm. A Exterior of right valve B Exterior of left valve C Dorsal view of both valves D Close up of periostracum of right valve E Interior of left valve F Interior of right valve G Close up of hinge of left valve H Close up of hinge of right valve.

Figure 4 from: Valentich-Scott P, Powell II CL, Lorenson TD, Ewards BE (2014) A new genus and species of Thyasiridae (Mollusca, Bivalvia) from deep-water, Beaufort Sea, northern Alaska. ZooKeys 462: 11-26. https://doi.org/10.3897/zookeys.462.6790

Figure 4 - A–D Spinaxinus sentosus. A–G holotype, NMW.Z. 2002.108.1, length = 13.5 mm, height = 13.3 mm, width = 8.6 mm. A Exterior of right valve B Interior of left valve C Dorsal view of both valves D Scanning electron micrograph of periostracum, scale bar = 200 µm. Photo credit P. Graham Oliver and Anna M. Holmes, National Museum of Wales.

Figure 5 from: Valentich-Scott P, Powell II CL, Lorenson TD, Ewards BE (2014) A new genus and species of Thyasiridae (Mollusca, Bivalvia) from deep-water, Beaufort Sea, northern Alaska. ZooKeys 462: 11-26. https://doi.org/10.3897/zookeys.462.6790

Figure 5 - A–G Maorithyas marama, holotype, GNS–TM 305, length = 18.7 mm, height = 17.2 mm, width = 13.7 mm. A Exterior of right valve B Exterior of left valve C Dorsal view of both valves D Interior of left valve B Interior of right valve F Close up of hinge of left valve G Close up of hinge of right valve.

Figure 2 from: Valentich-Scott P, Powell II CL, Lorenson TD, Ewards BE (2014) A new genus and species of Thyasiridae (Mollusca, Bivalvia) from deep-water, Beaufort Sea, northern Alaska. ZooKeys 462: 11-26. https://doi.org/10.3897/zookeys.462.6790

Figure 2 - Shaded seafloor bathymetry showing shape and approximate dimension of the Canning seafloor mount. The core sites are shown as red dots.

Figure 3 from: Valentich-Scott P, Powell II CL, Lorenson TD, Ewards BE (2014) A new genus and species of Thyasiridae (Mollusca, Bivalvia) from deep-water, Beaufort Sea, northern Alaska. ZooKeys 462: 11-26. https://doi.org/10.3897/zookeys.462.6790

Figure 3 - A–H. Wallerconcha sarae gen. n., sp. n. A–H holotype, SBMNH 235481, length = 23.9 mm, height = 21.3 mm, width = 16.7 mm. A Exterior of right valve B Exterior of left valve C Dorsal view of both valves D Close up of periostracum of right valve E Interior of left valve F Interior of right valve G Close up of hinge of left valve H Close up of hinge of right valve.