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. 2022 Feb 18:190:69-85.
doi: 10.3897/phytokeys.190.78164. eCollection 2022.

Two new species of Navicula (Bacillariophyta) from Southeast Asia

Maxim S Kulikovskiy  1 , Dmitry A Chudaev  2 , Anton M Glushchenko  1 , Irina V Kuznetsova  1 , John Patrick Kociolek  3   4
Affiliations

Two new species of Navicula (Bacillariophyta) from Southeast Asia

Maxim S Kulikovskiy et al. PhytoKeys. .

Abstract

We present light and scanning electron microscopical observations on two new species of Navicula Bory sensu stricto from Southeast Asia. Naviculawinoniformis Chudaev, Glushchenko, Kulikovskiy & Kociolek, sp. nov. differs from taxa with similar outline and size by the combination of simple drop-like external raphe endings deflected to the primary valve side, presence of well-developed external longitudinal grooves and relatively low lineolae density. Naviculasparsilineolata Chudaev, Glushchenko, Kulikovskiy & Kociolek, sp. nov. can be discriminated from the taxa of similar valve shape and size by consistently lower lineolae density, and from the majority of them also by the structure of external proximal raphe endings with small projections in proximal parts and larger triangular insertions in distal parts. Some remarks on Navicula species diversity and its distribution in the Southeast Asia are given.

Keywords: Diatoms; Navicula; Southeast Asia; distribution; freshwaters; morphology; new species; taxonomy.

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Figures

Figure 1.
Figure 1.
A–PNaviculawinoniformis Chudaev, Glushchenko, Kulikovskiy & Kociolek, sp. nov. LM, DIC. Size diminution series. Vietnam, slides no 00269 (A), 00318 (L, P, N), 00323 (I), 00326 (C), 00328 (B), 02079 (O), 03572 (E, F, H, K, M), 03773 (D), 04853 (J). Laos, slide no 00956 (G). Holotype (E). Scale bar: 10 μm.
Figure 2.
Figure 2.
A–FNaviculawinoniformis Chudaev, Glushchenko, Kulikovskiy & Kociolek, sp. nov. SEM. Sample no 03572. A–C external views D–F internal views A, D the whole valve B, E central area C, F valve end. A black arrows show the terminal raphe fissures. White arrow shows the indistinct kink of raphe branch B white arrows show central raphe pores. Black arrow shows the very slightly elevated raphe-sternum C black arrow shows the terminal raphe fissure. White arrow shows the longitudinal grooves where areola openings are located. White arrowheads show the small isolated apical areolae D white arrows show the accessory rib E black arrow shows the rectangular areola opening. Black arrowhead shows the circular areola opening. White arrows show the central raphe endings. White arrowhead shows the raphe slit F black arrows show the stria which are slightly wider than virgae. White arrow shows the helicroglossa. White arrowheads show the small isolated apical areolae. Scale bars: 5 μm (A); 2 μm (B–E); 1 μm (F).
Figure 3.
Figure 3.
A–NNaviculasparsilineolata Chudaev, Glushchenko, Kulikovskiy & Kociolek, sp. nov. LM, DIC. Size diminution series. Laos, slides no 00962 (A, B, F, C–E, G, I, J, L, M, N), 01621 (H, K). Holotype (D). Scale bar: 10 μm.
Figure 4.
Figure 4.
A–FNaviculasparsilineolata Chudaev, Glushchenko, Kulikovskiy & Kociolek, sp. nov. SEM. Sample no 00962. A–C external views D–F internal views A–C external views D–F internal views A, D the whole valve B, E central area C, F valve end A black arrow shows the very slightly elevated raphe-sternum B white arrows show the drop-like central pores. Black arrows show the larger triangular insertion in distal part. White arrowheads show the small projections in proximal part. Black arrowhead shows the transapical sutures C black arrow shows the terminal raphe fissure. White arrows show the longitudinal grooves where areola openings are located. Black arrowhead shows the transapical sutures. White arrowheads show the small isolated apical areolae D black arrowheads show the helictoglossae E black arrow shows the stria which slightly wider than virgae. White arrows show the areola openings occluded with hymenes. Black arrowheads show the central raphe endings. White arrowheads show the raphe slits F black arrow show the stria which are wider than virgae. Black arrowhead shows the helictoglossa. White arrowhead shows the raphe slit. Scale bars: 10 μm (A, D); 1 μm (B, C, E, F).
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