Nagumoea livingstonensis Van de Vijver & Kociolek, 2018

Vijver, Bart Van De & Kociolek, J. Patrick, 2018, A new species of Nagumoea (Bacillariophyta) from Antarctica, and a further consideration of the systematic position of the genus, Phytotaxa 349 (2), pp. 152-158 : 153-155

publication ID

https://doi.org/ 10.11646/phytotaxa.349.2.5

persistent identifier

https://treatment.plazi.org/id/0D398786-FFB8-FF9E-8DC5-7ECEFB25AD64

treatment provided by

Felipe

scientific name

Nagumoea livingstonensis Van de Vijver & Kociolek
status

sp. nov.

Nagumoea livingstonensis Van de Vijver & Kociolek sp. nov. ( Figs 1–9 View FIGURES 1–9 )

Light Microscopy ( Figs 1–5 View FIGURES 1–9 ): Frustules in girdle view rectangular, symmetrical in both apical and transapical axes. Valves linear to linear-lanceolate with weakly convex margins and non-protracted broadly rounded apices. Valve dimensions (n=10): length 7–13 μm, width 1.8–2.2 μm. Raphe in LM only very weakly detectable. Fibulae very distinct, visible in both valve and girdle view, 3–6 in 10 μm. Striae and areolae not discernible in LM. SEM ( Figs 6–9 View FIGURES 1–9 ): Valve face slightly arched. Mantle relatively deep ( Fig. 8 View FIGURES 1–9 ). Transapical striae on the valve face composed of one, relatively large, rounded areola, positioned very close to the axial area ( Fig. 7 View FIGURES 1–9 ). Mantle striae composed of rarely one, usually two large, rounded areolae, located close to the valve face/mantle junction ( Fig. 8 View FIGURES 1–9 ), ca. 40 in 10 μm. Mantle edge formed by a broad hyaline zone. Clear hyaline zone between valve face areolae and mantle areolae ( Figs 7, 8 View FIGURES 1–9 ). External raphe branches straight, rather deep ( Fig. 8 View FIGURES 1–9 ). Proximal raphe endings straight, weakly expanded, positioned very closely together ( Figs 7, 8 View FIGURES 1–9 ). Terminal raphe fissures continuing onto the valve mantle, clearly unilaterally hooked ( Fig. 7 View FIGURES 1–9 ). Internally, raphe simple with proximal endings terminating on a raised, narrow central nodule ( Fig. 6 View FIGURES 1–9 ). Distal endings terminating onto small helictoglossae ( Fig. 9 View FIGURES 1–9 ). Fibulae very robust, showing a complicated shape as typical for the genus Nagumoea ( Fig. 9 View FIGURES 1–9 ). Fibulae usually broad, often even plate-like with a broad base near the valve margin and a concave near the middle ( Fig. 9 View FIGURES 1–9 ). Siliceous elevations present connecting the lower parts of the fibulae ( Figs 6, 9 View FIGURES 1–9 , arrows). Presence of a keel never observed.

Type:— Coastal pool near Shepherd’s Hill, Byers Peninsula, Livingston Island , South Shetland Islands , Maritime Antarctic Region , sample BY002, B. Van de Vijver, 9 January 2009 (62°40’11.4”S / 61°06’02.0”W) (holotype: BR! slide no. 4502; isotype: PLP! slide no. 336, University of Antwerp, Belgium). Figure 4 View FIGURES 1–9 is of the holotype GoogleMaps .

Etymology:—The specific epithet refers to Livingston Island where the new species is described from.

Ecology and associated diatom flora:— Nagumoea livingstonensis was so far only found in a sample taken from a relatively large coastal pool on the shore of Byers Peninsula. The pool had a pH of 7.27 and a conductivity of 247 μS/cm. Dominant taxa in the sample include Psammothidim papilio (D.E. Kellogg et al. 1980: 183) Van de Vijver & Kopalová (in Kopalová et al. 2012: 204), P. germainii (Manguin in Bourrelly & Manguin 1954: 20) Sabbe (in Sabbe et al. 2003: 242) and Mayamaea permitis ( Hustedt 1945: 919) K. Bruder & Medlin (2008: 327) .

BR

Embrapa Agrobiology Diazothrophic Microbial Culture Collection

PLP

Institute of Himalayan Bioresource Technology

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