Luticola centraloporea M. Rybak, Getler et Kociolek 2024, sp. nov.
Creators: name: Rybak, Mateusz
name: Getler, Karol
name: Kociolek, John Patrick
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Chromista
Bacillariophyta
Bacillariophyceae
Naviculales
Naviculaceae
Luticola
Luticola centraloporea

description: Luticola centraloporea M.Rybak, Getler et Kociolek sp. nov.
LM observations (1A–T):— Valves elliptic-lanceolate to linear-lanceolate with rounded apices (Figs 1A–T). Valve length 9.0–21.0 µm, width 4.0–6.0 µm and 20–24 striae in 10 µm (n = 35). Axial area narrow and linear. Central area rectangular to bow-tie shaped and bordered near margin by 2–3 shortened striae (Figs 1A–H). Isolated pore clearly visible in the central part of central area almost between proximal raphe endings (Figs 1A–H). Raphe filiform, with proximal raphe endings clearly curved away from the isolated pore, distal raphe endings barely visible (Figs C, D) elongated, weakly hooked opposite the proximal raphe endings. Striae clearly radiate with 3–4 areolae per striae. No morphological differences were observed between the European and North American populations.
SEM observations (2A–H, 3A–H):— Externally, striae composed by 3–4 areolae per striae, rounded, sometimes enlarged near the valve face margin (Figs 2A–D, 3A, B). Internally, areolae covered by hymen forming continuous strip, separated by not thickened virgae (Figs 3C). Single row of areolae (interrupted on the apices) present also on valve mantle (Figs 2C, D, G, 3A, B, G). Both, valve face and mantle areolae circular in shape. Isolated pore rounded, located in the central part of the central area, almost between proximal raphe endings (Figs 2A–F, 3A, B, E). Raphe branches straight and filiform, with proximal endings pore-like shaped and curved away of isolated pore bearing side (Figs 2A–F, 3A, B, E). Distal raphe endings pore-like shaped, terminating onto valve face, only slightly bent away of isolate pore bearing side (Figs 2A–D, G, 3A, B, G). Internally, isolated pore opening small, c-shaped, positioned midway between valve margin and the central area (Fig. 3F). Longitudinal channels located along on both sides of valves (Fig 3C). Externally, central area bow-tie shaped with a smooth surface (Figs 2c, 3A, B). Girdle bands with two rows of poroids (Fig 3D). No morphological differences were observed between the European and North American populations.
Type:— United States of America, Castle Rock Lake, Wisconsin, 43°59’56”N 89°59’33”W, moss sample from lake shore, collected in April 2015. Holotype: Slide no. SZCZ 29315 at the University of Szczecin, isotype 1 slide no. 2015/12 and unmounted material with the same number at the University of Rzeszów, Poland, isotype 2 slide no. WA0000166879 and unmounted material with the same number at the Herbarium of the Faculty of Biology, University of Warsaw. The holotype population is presented in Figs 1L–T.
Etymology:— Name refers to the position of isolated pore.
Distribution:— Probably widely distributed in the northern hemisphere, observed in Wisconsin (USA) and in Warsaw (Poland).
Ecology and accompanying taxa:— In both analyzed samples the species occurred very rarely (<0.5% share in the community) also in both samples, diatoms were rare and represented only a few species. In sample 2015/12, the most common associated species were Geissleria decussis (Østrup) Lange-Bertalot & Metzeltin (1996: 65), Planothidium sp., Skabitschewskia peragalloi (Brun & Héribaud) Kuliskovskiy & Lange-Bertalot (in Kulikovskiy et al. 2015: 85). In sample 2022/199 the most common taxa encountered were Humidophila delognei Goeyers & Van de Vijver (2023: 3) and Luticola micra Levkov, Metzeltin & A.Pavlov (2013: 156).
Similar species:— Luticola confusa M.Rybak & Czarnota (in Rybak et al. 2023: 8), L. imbricatiformis Levkov, Metzeltin & Pavlov (2013: 134), L. mitis Levkov, Metzeltin & A.Pavlov (2013: 161), L. mutica, L. rotunda Solak & Levkov (in Levkov et al. 2013: 212).
description: Published as part of Rybak, Mateusz, Getler, Karol & Kociolek, John Patrick, 2024, Luticola centraloporea sp. nov. - a new diatom (Bacillariophyceae: Diadesmidaceae) species from Europe and North America, pp. 119-130 in Phytotaxa 669 (2) on pages 120-122, DOI: 10.11646/phytotaxa.669.2.4, http://zenodo.org/record/14520448