taxonID	type	description	language	source
03C3110B4E45FF9EFF4C8807FDEA2796.taxon	description	Family: Eunotiaceae Kützing 1844 Genus: Eunotia Ehrenberg 1837	en	Taylor, Jonathan C., Cocquyt, Christine (2025): Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo. Phytotaxa 704 (1): 49-59, DOI: 10.11646/phytotaxa.704.1.4, URL: https://doi.org/10.11646/phytotaxa.704.1.4
03C3110B4E45FF9AFF4C8897FD1B215C.taxon	description	Description LM: — Frustule in girdle view broadly rectangular, copulae on dorsal side considerably narrower than on the ventral side, both valve faces obliquely visible from the dorsal side. Silica thickenings present on the valve mantle at the junction with the copulae. Valves dorsiventral. Ventral valve margin of longer cells straight, ventral margin of smaller specimens evenly convex; strongly convex dorsal margin. Ends obliquely protracted, sub-rostrate to rostrate, in larger cells strongly dorsally deflected. Ends in most cells heteropolar. Length 12 – 36 (46) μm, breadth 4.5 – 7.0 (8.0) μm. Terminal nodules close to the poles in shorter cells, further away in larger specimens. Terminal raphe fissures short to very short on the valve face, in some cases entirely on the valve mantle. Striae more widely spaced in the centre of the cell, weakly radial, 9 – 14 but mostly 10 – 12 in 10 μm, becoming denser and sometimes less prominently radial near the apices, 14 – 16 in 10 μm. Areolae not resolvable in LM. SEM: — Externally terminal fissures slightly enlarged, mostly restricted to the mantle (Fig. 43) occasionally extending onto the valve face (Fig. 46). Internally the raphe fissures terminate, only moderately bent, in raised helictoglossae (Figs 52 – 54). Raphe fissures end in a rather large terminal nodule which extends as a hyaline area free of striae to the dorsal margin (Fig. 52), and to the edge of the mantle (Fig. 44). Striae uniseriate, interrupted at the junction of the valve face and mantle on the ventral margin by a marginal crest (Fig. 45). Marginal ridges, formed by virgae resulting from indented striae, are present on the dorsal margin visible in both LM (Fig. 14) and SEM (Fig. 49). Areolae (35) 40 – 45 in 10 μm, with small foramina lips (Figs 48, 49). Dense concentrations of areolae present on both poles forming striae perpendicular to the apical pole (Fig. 47) often somewhat irregularly arranged (Fig. 49), consistent with apical pore fields. Spines absent from the poles and valve margins. A single rimoportula is present located on the valve mantle almost directly in line with the terminal fissure (Fig. 52). A pseudoseptum-like structure may be observed at the apices in both LM and SEM (Figs 51, 53). Several girdle bands present. Valvocopula thin and not perforated. At least one short, open band near the apices broader on the ventral than on the dorsal side, and one broader, probably closed band with a transapical row of areolae, 30 in 10 µm, near both edges and irregularly scattered areolae in-between.	en	Taylor, Jonathan C., Cocquyt, Christine (2025): Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo. Phytotaxa 704 (1): 49-59, DOI: 10.11646/phytotaxa.704.1.4, URL: https://doi.org/10.11646/phytotaxa.704.1.4
03C3110B4E45FF9AFF4C8897FD1B215C.taxon	materials_examined	Type: — DEMOCRATIC REPUBLIC OF THE CONGO. Tshopo Province: Moni River, just downstream from the campsite in the tropical rain forest, sand from the stream bed, 0 ° 50 ’ 47.29 ” N and 24 ° 32 ’ 36.63 ” E, CCA 4386, Andreas Popelier, 18 July 2017 (holotype BR! 4846, Meise Botanic Garden, Belgium, the valve representing the holotype is here illustrated in Fig. 21; isotype SANDC! 24 - 538, South African National Diatom Collection, South Africa). Registration: — http. // phyocbank. org / 105517	en	Taylor, Jonathan C., Cocquyt, Christine (2025): Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo. Phytotaxa 704 (1): 49-59, DOI: 10.11646/phytotaxa.704.1.4, URL: https://doi.org/10.11646/phytotaxa.704.1.4
03C3110B4E45FF9AFF4C8897FD1B215C.taxon	etymology	Etymology: — We name this new Eunotia species after the tropical forest habitat in which it occurs.	en	Taylor, Jonathan C., Cocquyt, Christine (2025): Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo. Phytotaxa 704 (1): 49-59, DOI: 10.11646/phytotaxa.704.1.4, URL: https://doi.org/10.11646/phytotaxa.704.1.4
03C3110B4E45FF9AFF4C8897FD1B215C.taxon	biology_ecology	Ecology and distribution: — The species was found in streams in the tropical rain forest with sandy substrate, with a pH ranging from 5.33 to 5.71 and conductivity ranging from 9.8 to 12.7 µS. cm- 1. Measured nitrate values ranged from 0.124 to 0.191 mg. L- 1. Besides the type locality this species was also observed in the Libongo, Isalowe and Ngima rivers, all located in the Yangambi Biosphere Reserve in the Tshopo province of the D. R. Congo. Eunotia tropicaesilvae was found at a relative abundance of 7.6 % in sample CCA 4386, other taxa found in the sample included: Eunotia spp. (30 %) and small Naviculoid taxa (37.4 %).	en	Taylor, Jonathan C., Cocquyt, Christine (2025): Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo. Phytotaxa 704 (1): 49-59, DOI: 10.11646/phytotaxa.704.1.4, URL: https://doi.org/10.11646/phytotaxa.704.1.4
03C3110B4E41FF9AFF4C8E51FE5024E4.taxon	description	Description LM: — Frustule in girdle view broadly rectangular, striae present on valve mantle only, 12 – 14 in 10 μm. Ventral valve margins straight, convex dorsal margins. Valve poles not, to weakly protracted, rounded. Length 8.5 – 19.0 μm, breadth 3.5 – 5.0 μm. Terminal nodules close to the poles. Terminal raphe fissures short to very short on the valve face. Striae absent from valve face. Large areolae present on dorsal valve margins, 12 – 14 in 10 μm, smaller more densely spaced areolae on the ventral margin, 19 in 10 μm. SEM: — Externally the terminal fissures extend onto the valve face and end in a slightly reflexed spathulate groove (Fig. 82). Internally the raphe fissures terminate in small raised helictoglossae (Figs 84, 85). Striae absent from the valve face, present on the dorsal and (Figs 75 – 79) and ventral valve mantle (Figs 80, 81, 83), 12 – 16 in 10 µm, of irregular length and not reaching the edge of the valve mantle on the dorsal mantle. Rarely an isolated areola is present on the valve face near the terminal raphe fissure (Figs 84, 85, arrow). Rimoportulae not observed. Areolae at the valve margin, sometimes occluded by silica (Fig. 82), visible internally (Fig. 85). Small copula open near the pole (Fig. 82, arrow) and a broader girdle band with one row of round areolae, 28 in 10 µm (Fig. 83), sporadic an isolated areola present on this band.	en	Taylor, Jonathan C., Cocquyt, Christine (2025): Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo. Phytotaxa 704 (1): 49-59, DOI: 10.11646/phytotaxa.704.1.4, URL: https://doi.org/10.11646/phytotaxa.704.1.4
03C3110B4E41FF9AFF4C8E51FE5024E4.taxon	materials_examined	Type: — DEMOCRATIC REPUBLIC OF THE CONGO. Tshopo Province: Moni River, just downstream from the campsite in the tropical rain forest, sand from the stream bed, 0 ° 50 ’ 47.29 ” N and 24 ° 32 ’ 36.63 ” E, CCA 4386, Andreas Popelier, 18 Jul. 2017, (holotype BR! 4846, Meise Botanic Garden, Belgium; the valve representing the holotype is here illustrated in Fig. 60; isotype SANDC! 24 - 538, South African National Diatom Collection, South Africa). Registration: — http. // phyocbank. org / 105518	en	Taylor, Jonathan C., Cocquyt, Christine (2025): Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo. Phytotaxa 704 (1): 49-59, DOI: 10.11646/phytotaxa.704.1.4, URL: https://doi.org/10.11646/phytotaxa.704.1.4
03C3110B4E41FF9AFF4C8E51FE5024E4.taxon	etymology	Etymology: — We name this new Eunotia species based on the presence of the rows of distinct marginal areolae visible in LM and SEM.	en	Taylor, Jonathan C., Cocquyt, Christine (2025): Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo. Phytotaxa 704 (1): 49-59, DOI: 10.11646/phytotaxa.704.1.4, URL: https://doi.org/10.11646/phytotaxa.704.1.4
03C3110B4E41FF9AFF4C8E51FE5024E4.taxon	biology_ecology	Ecology and distribution: — The species was found in a stream with sandy substrate (Moni River). This taxon has not been observed from any other locality to date. No measurements of pH, conductivity or nitrate content were taken during the sampling.	en	Taylor, Jonathan C., Cocquyt, Christine (2025): Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo. Phytotaxa 704 (1): 49-59, DOI: 10.11646/phytotaxa.704.1.4, URL: https://doi.org/10.11646/phytotaxa.704.1.4
