Published December 13, 2021
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Table 2 in New and poorly known " araphid " diatom species (Bacillariophyta) from regions near Lake Titicaca, South America and a discussion on the continued use of morphological characters in " araphid " diatom taxonomy
Authors/Creators
- 1. Water Laboratory, University of Evora, P. I. T. E. Rua da Barba Rala No. 1, 7005 - 345 Evora, Portugal & Institute of Earth Sciences - ICT, University of Evora, Rua Romao Ramalho n °. 59, 7000 - 671 Evora, Portugal
- 2. Observatory for Climate, Environment and Biodiversity (OCEB), Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Science and Technology (LIST), 41 rue du Brill, 4422 Belvaux, Luxembourg
Description
Table 2. Comparison of Pseudostaurosira heteropolaris sp. nov and P. oblonga sp. nov. with morphologically similar, congeneric species. Features in bold italic font are defining for each taxon.
| Feature/species | P. alvareziae Cejudo-Figueiras, E. Morales & Ector | P. americana E. Morales | P. bardii Beauger, C.E. Wetzel & Ector | P. heteropolaris sp. nov. | P. oblonga sp. nov. |
| Valve dimensions (µm) | L: 10-18 W: 3.6-5.0 | L: 6.0-38.0 W: 4.5-5.0 | L: 4.0-6.5 W: 3.0-5.5 | L: 3.0-4.3 W: 2.6-3.3 | L: 6.9-13.5 W: 3.8-4.8 |
| Stria density (in 10 µm) | 13-15 | 16-18 | 12-16 | 13-16 | 13-14 |
| Valve outline; axial area; virgae | Elliptic with faintly subrostrate to broadly rounded apices, isopolar; narrowly lanceolate, faintly depressed in external view with respect to virgae, at the same level as virgae in internal view; much wider than striae | Lanceolate with cuneate apices, isopolar; linear, at same level as virgae in external and internal view; wider than striae | Elliptic to round with broadly rounded ends, isopolar; lanceolate to elliptic, depressed with respect to virgae in external view, at the same level as virgae in internal view; wider than striae | Ovoid (sometimes elliptic in small specimens), heteropolar; elliptic, externally slightly depressed with respect to virgae, internally at the same level as the latter; much wider than striae | Oblong with widely rounded apices, isopolar; lanceolate, depressed in external and internal view with respect to virgae; wider than striae |
| Areolae; volae; striae | Wide, round to elliptic; well-developed and forming a tight mesh-like structure seen in external and internal view; composed of up to 6 areolae decreasing in size away from valve face/mantle junction, larger areolae contiguous to spines on valve face and mantle | Wide, round to elliptic; well-developed and forming a tight mesh-like structure visible externally and internally; composed of up to 7 areolae with little size variation away from valve face/mantle junction on valve face, valve mantle with larger areolae varying from elliptic to trapezoid | Wide, round to elliptic; developed and directed toward valve interior; composed of up to 5 areolae decreasing in size away from valve face/mantle transition, first areola on mantle trapezoid and as large as first areola on valve face | Narrow, elliptic to round or hemispherical at the axial area; well-developed and directed toward valve interior, base of volae wide giving areolae a C-shape; composed by up to 7 areolae decreasing in size away from valve face/mantle transition, first areola on mantle as large as first areola on valve face | Narrow, round to elliptic; well-developed forming a tight mesh-like structure visible externally and internally; composed by up to 6 areolae decreasing in size away from valve face/mantle transition, first areola on mantle trapezoid and larger |
| Spines; stipules; flaps | Solid, elliptic base, as wide as basal vimen, flattened body and widely spatulate tips with broad lateral projections; small, conical; incipient on valve face, developed on valve mantle | Solid, elliptic base, as wide as basal vimen, cylindrical body with a V-shaped middle opening and openly concave sides, widely spatulate tips with serrate borders; well-developed, almost covering entire first areola on mantle; well-developed, more common on valve mantle | Solid, elliptic base, wider than basal vimen, flattened body, triangular in side view, spatulate tips with serrate borders; developed; developed but more frequent on mantle areolae | Solid, elliptic to rectangular base, wider than basal vimen, cylindrical body with concave sides, spatulate tips with pinnatifid bifurcations; absent; absent | Solid, elliptic base, as wide as basal vimen, quasi-cylindrical body with concave sides, trapezium-shaped in side view, spatulate tips with wide lateral projections; incipient or absent; little developed on valve face, larger on valve mantle |
| Apical pore fields; mantle abvalvar blisters | Well-developed, externally with wide round poroids and covered by contorted flaps; small, absent from apices | Well-developed, of cavernous appearance externally, poroids lie at bottom of troughs, internally round poroids open into a shallow depression; well-developed, present at apices | Very reduced almost completely externally covered by flaps, only a pair of poroids can be seen, of cavernous appearance, internally only 3 narrow, round poroids can be seen, which open into a shallow depression; developed and present at apices | Very reduced, externally up to 3 cavernous poroids; small present at apices | Reduced, covered by small external flaps, internally opening through few, narrow, unsunk poroids; small absent from apices |
| References | Cejudo-Figueiras et al. (2011) | Cejudo-Figueiras et al. (2011), Morales et al. (2013b) | Beauger et al. (2019) | This study | This study |
Notes
Published as part of Morales, Eduardo A., Wetzel, Carlos E. & Ector, Luc, 2021, New and poorly known " araphid " diatom species (Bacillariophyta) from regions near Lake Titicaca, South America and a discussion on the continued use of morphological characters in " araphid " diatom taxonomy, pp. 23 in PhytoKeys 187 on page 23, DOI: 10.3897/phytokeys.187.73338
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References
- Cejudo-Figueiras, C, Morales, EA, Wetzel, CE, Blanco, S, Hoffmann, L, Ector, L, 2011. Analysis of the type of Fragilaria construens var. subsalina (Bacillariophyceae) and description of two morphologically related taxa from Europe and the United States. Phycologia 50 (1): 67 - 77, DOI: https://doi.org/10.2216/09-40.1
- Morales, E, Rosen, B, Spaulding, S, 2013b. Pseudostaurosira americana. In: Diatoms of North America. https://diatoms.org/species/pseudostaurosira_americana
- Beauger, A, Wetzel, CE, Voldoire, O, Ector, L, 2019. Pseudostaurosira bardii (Fragilariaceae, Bacillariophyta), a new species from a saline hydrothermal spring of the Massif Central (France). Botany Letters 166 (1): 3 - 13, DOI: https://doi.org/10.1080/23818107.2018.1460278