Achnanthidium bratanense Kapustin, Glushchenko & Kulikovskiy, 2022
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publication ID |
https://dx.doi.org/10.3897/phytokeys.188.77882 |
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persistent identifier |
https://treatment.plazi.org/id/FCB79B0C-E7D6-52BD-BB7A-653273C1909B |
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treatment provided by |
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scientific name |
Achnanthidium bratanense Kapustin, Glushchenko & Kulikovskiy |
| status |
sp. nov. |
Achnanthidium bratanense Kapustin, Glushchenko & Kulikovskiy sp. nov.
Figures 1 View Figure 1 , 2 View Figure 2
Description.
LM (Fig. 1A-T View Figure 1 ). Valves linear-elliptic to nearly elliptic with convex margins and rounded, broadly subcapitate apices. Frustules rectangular in girdle view and not bent (Fig. 1T View Figure 1 ). Length 5.0-8.7 µm, breadth 2.7-3.2 µm (n=32). In raphe valves axial area narrow, linear, slightly widening at center. Central area very small in raphe valves, outlined by shortened striae; central area in rapheless valves rhomboid (Fig. 1J View Figure 1 ). Raphe straight, filiform. In rapheless valves axial area expanded widening towards rhombic central area (Fig. 1E View Figure 1 ). Striae hardly discernable in LM, weakly radiate (Fig. 1A, H, K, M View Figure 1 ). Areolae indistinct in LM.
SEM (Fig. 2 View Figure 2 ). Externally, raphe straight, filiform with drop-shaped proximal and distal raphe endings (Fig. 2A, B View Figure 2 ). Internally, proximal raphe endings deflected in opposite directions, distal raphe endings terminating in helictoglossae (Fig. 2E, F View Figure 2 ). Striae weakly radiate throughout the valve, 41-44 in 10 µm, and composed of one to four large transapically elongated areolae of different length and shape (from slit-like to irregularly rectangular). Areolae absent along valve margins; mantle with a single row of slit-like to almost rectangular areolae. Internally, areolae occluded by a hymen (Fig. 2E, F View Figure 2 ).
Holotype (here designated): permanent slide No. MHA 01125, deposited at the Main Botanical Garden, Russian Academy of Sciences (MHA). Fig. 1A View Figure 1 illustrates the holotype.
Isotype (here designated): permanent slide No. 01125a, deposited in collection of Maxim Kulikovskiy, Timiryazev Institute of Plant Physiology, Russian Academy of Sciences.
Type locality.
Indonesia, Island of Bali, Lake Bratan, 08°16.579'S, 115°09.985'E, leg. I.I. Ivanov on 14 November 2010.
Etymology.
The specific epithet refers to the type locality, Lake Bratan.
Ecology.
Achnanthidium bratanense together with Gogorevia rinatii were the most abundant species in the sample. Rarely single frustules of Planothidium sp., Stauroneis sp., Cymbella sp. and other diatoms were encountered. During sampling the temperature was recorded as 25.7 °C, pH as 7.82, and conductivity as 22 μS ∙cm-1.
Distribution.
So far, this species is known from its type locality only.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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