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FIG. 8 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 8. — SEM images of Kobayasiella pseudostauron (Lange-Bertalot) Lange-Bertalot: A, B, external views of the complete valve; C, D, external views of the central area showing a stauros fascia and the multiseriate poroid covers over the striae between virgae; E, external view of the valve apex showing a curved proximal fissure opening into an irregular surface depression; F, magnified view of the terminal raphe fissure; G, internal view of a broken valve showing T-shaped proximal fissure and elongated helictoglossa. Scale bars: A, B, G, 5 µm; C-E, 2 µm.

FIG. 2 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 2. — Light micrograph diminution series of Kobayasiella Lange-Bertalot species: A-P, Kobayasiella parasubtilissima (Kobayasi & Nagumo) Lange-Bertalot; Q-AB, Kobayasiella madumensis (Jørgensen) Lange-Bertalot; AC-AO, Kobayasiella subtilissima (Cleve) Lange-Bertalot. Scale bar: 10 µm.

FIG. 5 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 5. — SEM images of Kobayasiella madumensis (Jørgensen) Lange-Bertalot: A, external view of the complete valve; B, internal view of the complete valve; C, external view of the axial and central areas showing the multiseriate poroid covers between irregular formed virgae; D, internal view of the central area showing Y-shaped proximal fissures; E, central area with differentially thickened axial ridges; F, external view of the valve apex showing an elevated terminal area with a partially curved proximal fissure; G, internal valve view of the apex. Helictoglossa expanded onto a highline apex. Areolae interrupted around the apex. Scale bars: A, B, 10 µm; C, D, F, 3 µm; E, 500 nm; G, 2 µm.

FIG. 9 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 9. — SEM images of Kobayasiella micropunctata (Germain) Lange-Bertalot: A, B, external views of the complete valve; C, external view of the central area showing the multiseriate poroid covers over the striae between virgae; D, external view of the valve apex showing a hooked terminal fissure opening into an irregular surface depression; E, internal view of the apex with magnified view of the terminal elongated helictoglossa; F, internal view of a copula showing two rows of pores occluded with small round pores. Scale bars: A, B, 5 µm; C, D, 2 µm; E, 1 µm; F, 500 nm.

FIG. 15 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 15. — SEM images of Nupela tenuicephala (Hustedt) Lange-Bertalot: A, B, external views of complete valves with recessed depressions covered with multiporoid volae; C, internal view of the whole valve; D, external view of the central area showing the expanded proximal raphe fissures and multiseriate poroid covers over the areolae; E, internal view of the central area with bent proximal fissures; F, internal views of the apex, helictoglossa small and elevated. Areolae interrupted around the apex. Scale bars: A-C, 5 µm; D, 2 µm; E, F, 1 µm.

FIG. 14 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 14. — SEM images of Sellaphora vincentiana sp. nov.: A, C, E, external views of the complete valve; B, F, external view of the central area showing a linear expanded proximal fissure and recessed poroid covers over the areolae; D, external view of the apex with a bent fissure onto the mantle. Scale bars: A, C, 3 µm; B, D, 1 µm; E, F, 500 nm.

FIG. 1 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 1. — Lake sampling locations and surface deposits in Tursujuq National Park. Insert shows the position of Tursujuq Park in Nunavik, Québec, eastern North America.

FIG. 4 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 4. — SEM images of Kobayasiella parasubtilissima (Kobayasi & Nagumo) Lange-Bertalot: A, external view of the complete valve; B, internal view of the valve areolae recessed between virgae; C, section of girdle band showing one row of evident pore and a second row of scattered less evident pores with volae covers; D, external view of the axial and central areas showing the multiseriate poroid covers between the virgae; E, internal view of the central area showing T-shaped proximal fissures; F, central area with a weak central depression; G, external view of the valve apex, showing a partially curved proximal fissure opening into a small round surface depression; H, internal valve view of the apex. Helictoglossa expanded onto a highline apex. Areolae continuous around the apex. Scale bars: A, 10 µm; B-E, H, 1 µm; F, 600 nm; G, 3 µm.

FIG. 11 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 11. — SEM images of Adlafia bryophila (J.B.Petersen) Lange-Bertalot: A, external view of the complete valve; B, internal view of the complete valve; C, external view of the central area showing the multiseriate poroid covers over the areolae; D, internal view of the central area showing hooked proximal fissures to one side. Copula with one row of large occluded pores; E, external view of the apex with a curved fissure onto the mantle. A curved ridge follows the fissure; F, internal view of the apex with a small elevated helictoglossa. Areolae are continuous around the apex. Scale bars: A, B, 5 µm; C, D, 2 µm; E, F, 1 µm.

FIG. 3 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 3. — Light micrograph diminution series of Kobayasiella Lange-Bertalot species: A-J, Kobayasiella tursujuqensis sp. nov.; K-T. Kobayasiella pseudostauron (Lange-Bertalot) Lange-Bertalot. Scale bar: 10 µm.

FIG. 6 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 6. — SEM images of Kobayasiella subtilissima (Cleve) Lange-Bertalot:A, external view of the complete valve; B, internal view of the complete valve; C, external view of central area showing the multiseriate poroid covers between irregular formed virgae; D, internal view of the central area showing T-shaped proximal fissures and irregular orientated areolae; E, external view of the valve apex showing a partially curved proximal fissure opening into an elliptic surface depression; F, internal valve view of the apex. Helictoglossa expanded onto a highline apex. Areolae continue around the apex. Scale bars: A, B, 5 µm; C, 1 µm; D, F, 3 µm; E, 2 µm.

FIG. 10 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

FIG. 10. — Light micrograph diminution series of Adlafia Moser, Lange-Bertalot & Metzeltin, Sellaphora Mereschkowski and Nupela Vyverman & Compère species: A-R, Adlafia bryophila (J.B.Petersen) Lange-Bertalot; S-AG, Adlafia umiujaqensis sp. nov.; AH-AT, Adlafia ossiformis sp. nov.; AU-BJ, Sellaphora vincentiana sp. nov.; BK-BY, Nupela tenuicephala (Hustedt) Lange-Bertalot. Scale bar: 10 µm.

APPENDIX 4 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

APPENDIX 4. — Relative abundance of species as a function of DIC values.

APPENDIX 2 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

APPENDIX 2. — Relative abundance of species as a function of DOC concentrations.

APPENDIX 5 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

APPENDIX 5. — Relative abundance of species as a function of Mg values.

APPENDIX 3 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

APPENDIX 3. — Relative abundance of species as a function of pH values.

APPENDIX 1 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

APPENDIX 1. — Relative abundance of species as a function of alkalinity values.