identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
039287F1FFCFFF86C8A3FAB69A1CFD78.text	039287F1FFCFFF86C8A3FAB69A1CFD78.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Gomphonema correntinum Frenguelli 1933	<div><p>Gomphonema correntinum Frenguelli (1933: 422, pl. IV [4]: figs 24, 25) (Figs 2 –17)</p><p>Lectotype (here designated): slide 261(4) Frenguelli Diatom Collection at LPC. Fig. 8 (Finder: O/40) represents the lectotype.</p><p>Registration (lectotypification): http://phycobank.org/105478</p><p>Type locality: Argentina, Corrientes province, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-57.820805&amp;materialsCitation.latitude=-28.456306" title="Search Plazi for locations around (long -57.820805/lat -28.456306)">Estero Carambola</a> (28° 27' 22.7" S, 57° 49' 14.9" W). On aquatic macrophytes, 8.xii.1923, leg. J. Frenguelli.</p><p>Description: Valves clavate-lanceolate, with the widest part at the middle or slightly towards the apiculate headpole. Footpole slightly protracted and acutely rounded. Valve dimensions (n=14): length 28–42 μm, width 8.5–10 µm. Axial area straight and narrow, occupying about one sixth of the valve width. Central area unilateral and rectangular, delimited by a very shortened stria opposite to the rounded stigma. Raphe filiform and somewhat sinuous. Central raphe endings slightly drop-like expanded. Terminal raphe fissures bent to the same side, in opposite direction to the stigma. Striae uniseriate, parallel at centre becoming radiate towards the apices, 14–15 in 10 µm at the centre, 16–17 in 10 µm at the poles, continuous onto the valve mantle. Areolae with C- or 3-shaped volate occlusions, 40 in 10 μm, hardly discernible with LM. Internally, areolae with round foramina. Apical pore field located on the mantle, at the footpole only, composed of several rows of rounded poroids, divided in two areas by the raphe fissure. Mantle low, in right angle to the valve face. Girdle composed of open copulae, with one row of small poroids, 40 in 10 μm.</p><p>No. 369 (10 April 2025)</p><p>ISSN 2009-8987</p><p>Notes: In contrast to our measurements, Frenguelli (1933: 396) reported in his original description greater valve dimensions (length 41–57 μm, width 13 μm) and a lower stria density (10–12 in 10 μm). These discrepancies in morphometrics are usual when re-examining Frenguelli’s original materials (see Vouilloud &amp; al. 2022 and references therein). Later records of G. correntinum are scarce but all come from subtropical areas in NE Argentina: Frenguelli (1953) reported this species from a basalt quarry in Misiones province and Herbst &amp; Maidana (1983) found it in the flood plain of Paraná River in Chaco province.</p><p>Gomphonema Ehrenberg is one of the most taxon-rich genera of diatoms (Radhakrishnan &amp; al. 2020) with more than 930 recognised species (Guiry &amp; Guiry 2025). While many species possess clavate valves, only a handful have an apiculate apex and an acutely rounded footpole. We compared G. correntinum with the most similar species G. perapicatum Metzeltin &amp; Lange-Bertalot and G. graciloides Hustedt to assess whether it should be considered a valid species.</p></div>	https://treatment.plazi.org/id/039287F1FFCFFF86C8A3FAB69A1CFD78	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.		Plazi	Guerrero División Ficología, José M.	Guerrero División Ficología, José M. (2025): Lectotypification of Gomphonema correntinum Frenguelli (Gomphonemataceae, Bacillariophyceae). Notulae Algarum 369: 1-4
039287F1FFCEFF84C8A3FCF99A42FF6E.text	039287F1FFCEFF84C8A3FCF99A42FF6E.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Gomphonema graciloides Hustedt 1965	<div><p>Gomphonema graciloides was described from mosses at 1000 m in Parque Nacional do Itatiaia, Brazil (Hustedt 1965: 410, figs 43, 44), is the most similar species and could be easily confused with G. correntinum . However, it is distinguished by its slender valves, less asymmetrical to the apical axis, and its much lower areola density (28 in 10 μm).</p><p>We found that smaller specimens of G. perapicatum, a species described from Guyana, are similar in outline to G. correntinum while the larger ones are clearly different. Moreover, the former has larger valves (40–75 x 12–13.5 μm), lower stria (7–8 in 10 μm) and areola (15–18 in 10 μm) densities, and areolae clearly discernible under LM (Metzeltin &amp; Lange-Bertalot 2007).</p><p>We are grateful to Michael D. Guiry and an anonymous reviewer for comments and suggestions that improved our manuscript.</p><p>Frenguelli, J. (1933). Contribuciones al conocimiento de las diatomeas Argentinas. VII. Diatomeas de la región de los Esteros del Yberá (en la Provincia de Corrientes). Anales del Museo Nacional de Historia Natural 37: 365475.</p><p>Frenguelli, J. (1953). XIX Contribución al conocimiento de las diatomeas argentinas. Diatomeas del Territorio Nacional de Misiones. Revista del Museo de la Ciudad Eva Perón Nueva Serie 8 (Botánica No. 32): 63–86, 3 pls.</p><p>Guiry, M.D. &amp; Guiry, G.M. 2025. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 01 April 2025.</p><p>Herbst, N. &amp; Maidana, N.I. (1989). Diatoms of Chaco (República Argentina): 1. Nova Hedwigia 49 (1/ 2): 207–232, incl. I pl., 1 fig. [map].</p><p>Hustedt, F. (1965). Neue und wenig bekannte diatomeen. IX. Süsswasserdiatomeen aus Brasilien, insbesondere des Amazonasgebietes. Internationale Revue der gesamten Hydrobiologie 50 (3): 391–410.</p><p>Metzeltin, D. &amp; Lange-Bertalot, H. (2007). Tropical diatoms of South America II. Special remarks on biogeography disjunction. Iconographia Diatomologica 18: 1–877, incl. 296 pl.</p><p>Radhakrishnan, C., Das, S.K., Kumar, V., Kociolek, J.P. &amp; Karthick, B. (2020). A new freshwater Gomphonema Ehrenberg (Bacillariophyta) species from Eastern Himalayas, India. Fottea 20 (2): 128–136, 35 fig., 1 table.</p><p>Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T.W., McNeill, J., Monro, A.M., Prado, J., Price, M.J. &amp; Smith, G.F., editors (2018). International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress</p><p>No. 369 (10 April 2025)</p><p>ISSN 2009-8987</p><p>Shenzhen, China, July 2017. Regnum Vegetabile, Vol. 159. pp. [i]-xxxviii, 1–253. Glashütten: Koeltz Botanical Books .</p><p>Vouilloud, A.A., Guerrero, J.M., &amp; Morales, E.A. (2022). Fragilaria pinnata var. subcapitata Frenguelli, typification and current taxonomic status. Phytotaxa 566(1), 133–139.</p><p>No. 369 (10 April 2025)</p><p>ISSN 2009-8987</p></div>	https://treatment.plazi.org/id/039287F1FFCEFF84C8A3FCF99A42FF6E	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.		Plazi	Guerrero División Ficología, José M.	Guerrero División Ficología, José M. (2025): Lectotypification of Gomphonema correntinum Frenguelli (Gomphonemataceae, Bacillariophyceae). Notulae Algarum 369: 1-4
