identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
3C2E407596BC5BE588637A6DD77185F6.text	3C2E407596BC5BE588637A6DD77185F6.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Fragilariforma meireana Van de Vijver & D. M. Williams 2025	<div><p>Fragilariforma meireana Van de Vijver &amp; D. M. Williams sp. nov.</p><p>Figs 1, 2, 3</p><p>Holotype.</p><p>BR-4867 (Meise Botanic Garden, Belgium). Fig. 1 B represents the holotype .</p><p>Isotype.</p><p>Slide 453 (University of Antwerp, Belgium).</p><p>Registration.</p><p>http://phycobank.org/105490.</p><p>Type locality.</p><p>Unnamed pool at corner of Damse Vaart West and Noorweegse Kaai (Damme, West-Vlaanderen, Belgium), sample DAMME-6, (coll. date 26. v. 2018, leg. B. Van de Vijver).</p><p>Etymology.</p><p>This species is named in honour of Prof. Dr Patrick Meire, former head of the research group ECOBE (Department of Biology, Antwerp University, Belgium), and initiator of the biodiversity survey in Damme in 2018.</p><p>Description.</p><p>LM (Fig. 1). Valves linear with almost parallel, straight valve margins only very slightly narrowing just before the valve apices. Apices clearly protracted, distinctly rostrate, very rarely capitate (Fig. 1 F). Valve dimensions (n = 25): length 35–100 µm, width 4–5 µm. Sternum very narrow, linear, running from apex to apex. Central area absent. Striae parallel throughout the entire valve length, becoming very weakly radiate at the apices, 22–25 in 10 µm. Occasionally, two stria diverging near the valve centre (Fig. 1 B, D, G, black arrows). Rimoportula visible at both apices (Fig. 1 A, C, white arrows). Internal cells large, hyaline, robust (Fig. 1 O – Q). SEM (Figs 2, 3). Valve face flat with slightly raised virgae (Fig. 2 A, C). Striae uniseriate, composed of a series of small, rounded areolae (Fig. 2 B, C). Small marginal spines present, irregularly placed on the valve face / mantle junction (Fig. 2 B), usually on the virgae. Sternum very narrow, slightly raised (Fig. 2 B). Apical porefield large, entirely on the mantle, composed of at least 3–4 rows of round to quadratic porelli (Fig. 2 C). Rimoportula very small, externally rimmed (Fig. 2 B, white arrows). Occasionally, 2 rimoportulae present at one pole (Fig. 2 C, white arrows). Internally rimoportula small, weakly oblique (Fig. 2 D, E, white arrows). Valvocopula very large, plain on one side and with series of pores on the other (Fig. 2 F). Copulae small, with serrated edge, bearing one row of pores (Fig. 3 C). Internal cell robust (Fig. 3 A, B), located between both valves. Valvocopula covering most of the internal cell (Fig. 3 B, E, arrows). Internal cell with irregular ridged ornamentation (Fig. 3 D) on one side, plain on the other (Fig. 3 E). Occasionally, very shallow ridge present on the plain side visible as a thin line (Fig. 3 B).</p><p>Associated diatom flora and ecology.</p><p>Fragilariforma meireana has so far only been found in the small pool in Damme. The diatom flora in the pool is dominated by Eunotia bilunaris (Ehrenberg) Mills s. l. (21 % of all counted valves), Aulacoseira italica (Ehrenberg) Simonsen (19.5 %), Fragilaria campyla (Hilse) Van de Vijver et al. (17 %), Nitzschia archibaldii Lange-Bertalot (8 %) and Gomphonema utae Lange-Bertalot &amp; Reichardt (6 %). Most of these species are known to prefer meso- to eutrophic conditions with moderate to higher electrolyte contents, circumneutral to alkaline conditions (Lange-Bertalot et al. 2017). The presence of Eunotia bilunaris in this community is somewhat unusual as the species is mostly known to prefer oligotrophic, oligosaprobic conditions. However, it is clear that E. bilunaris as we know it today represents a complex of taxa present in different environmental conditions (Vanormelingen et al. 2008).</p></div>	https://treatment.plazi.org/id/3C2E407596BC5BE588637A6DD77185F6	Public Domain	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.		Pensoft via Plazi	Van de Vijver, Bart;Williams, David M.	Van de Vijver, Bart, Williams, David M. (2025): Fragilariforma meireana, a new araphid diatom species (Bacillariophyta) producing internal valves from Flanders. PhytoKeys 257: 167-177, DOI: 10.3897/phytokeys.257.155919
