Fottea 2023, 23(1):8-20 | DOI: 10.5507/fot.2022.008

Humidophila (Bacillariophyceae) in subtropical mountain springs and subaerial habitats, Paraná state, Brazil, with the description of H. piraquarae sp. nov.

Paula Carolina Ferreira1*, Vanessa Merlo Kava2, Thelma Alvim Veiga Ludwig1
1 Universidade Federal do Paraná, Centro Politécnico, Setor de Ciências Biológicas, Departamento de Botânica, Laboratório de Ficologia, Jardim das Américas, CEP 81531-980, Curitiba, Paraná, Brasil; *Corresponding author e-mail: paulacarolina2712@gmail.com, veiga13ufpr@gmail.com
2 Universidade Federal do Paraná, Centro Politécnico, Setor de Ciências Biológicas, Departamento de Genética, Laboratório de Genética de Microrganismos, Jardim das Américas, CEP 81531-980, Curitiba, Paraná, Brasil

The genus Humidophila is mainly characterized by small cells, striae often composed by one elongated areola occluded by thin hymenes. Species are distributed globally and are common in moist sub-aerial habitats. We identified five Humidophila species found in the well-conserved freshwater bodies and subaerial wet habitats from the mountain region "Mananciais da Serra". Four previously known species (Humidophila brekkaensis, H. contenta, H. nienta, H. paracontenta) and one new species (Humidophila piraquarae sp. nov.) were described and illustrated based on light and scanning electron microscopy observations. Humidophila piraquarae sp. nov. is similar to H. nienta (Carter) Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot et Kopalová and H. undulata Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot et Kopalová, but is best distinguished by their prominent constriction, apices broadly rostrate-rounded, striae density, raised siliceous thickening in the apical region of the axial area, and raphe proximal endings laterally expanded in anchor-shaped depressions. Addtionally, a list of Humidophila taxa already registered in Brazil is presented.

Keywords: diatom, Humidophila, morphology, new taxon, subaerial habitats, taxonomy

Received: January 5, 2022; Revised: May 5, 2022; Accepted: May 12, 2022; Prepublished online: February 13, 2023; Published: April 1, 2023  Show citation

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Ferreira, P.C., Kava, V.M., & Alvim Veiga Ludwig, T. (2023). Humidophila (Bacillariophyceae) in subtropical mountain springs and subaerial habitats, Paraná state, Brazil, with the description of H. piraquarae sp. nov. Fottea, 23(1), 8-20. doi: 10.5507/fot.2022.008
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