TABLE 3 in Taxonomy of three new Neidium Pfitzer species of the Arapiuns and Tapajós Rivers Basin (Santarém, Pará, Brazil)

TABLE 3. Summary morphological and metrics data for the Neidium and compared to closely related taxa.
TaxaN. borariN. angustirostratumN. statuariumN. itapariensisN. vandusenenseN. muyrakytanN. convolutumN. rolandschmidtiiN. sacoenseN. sterrenburgiiReferences(this study)Lange-Bertalot et al. (2003: 85)Siver & Hamilton (2005:364)(this study)Hamilton et al. (2019: 48)(this study)Liu et al. (2020: 172)Metzeltin & Lange- Bertalot et al. (2007: 177)Patrick & Reimer (1966: 402)Metzeltin & Lange-Bertalot et al. (2007: 180)Valve OutlineLinear-elliptical to ellipticalLinear-lanceolate to linear-ellipticalLinear-elliptical to ellipticalLinear-elliptical to elliptic-lanceolateLinear to linear- ellipticalLinear to linear- lanceolateLinear to linear- lanceolateLinear to slightly linear-lanceolateLinearLinearValve ApicesStrongly attenuatedAbruptly protacted narrow rostrateStrongly attenuatedStrongly protracted capitate apicesApiculate extendedAcute roundedWedge-shapedAttenuated to a wedge, obtusely roundedAcute rounded and apiculateAbruptly tapering wedge-shaped to moderately obtuse (not acute)Valve length (µm)52.15–67.9030–3736–5359.56–66.3096–11673.99–115.1081–123100–220 (not about 40–100)60–80105–165Breadth (µm)15.36–17.758.0–8.512–1513.4–15.120–2315.22–20.7718–2220–c.2719–2530–35 (not 19–25)Narrowly lanceolate, being linear andAxial areaNarrow, linearNarrow, linearNarrow, linear to ellipticalNarrow, linearLinear–ellipticalNarrow, almost linear from center to apexnarrow at the apex. Some areolae positioned at the axial area next to the rapheNarrow, almost linearNarrow, straightNarrow, linearCentral areaTransapically rounded to rhombic in shapeRather small, obliquely elongated transapicallyTransapically elliptical, with a ruminate to scrobiculate sculpturing between the proximal raphe fissuresTransapically elliptical to rhombic in shapeTransapically expandedRounded to ellipticalSmall, ellipticalabout 1/3 of the valve breadth, transapically ellipticalSmall, orbicular1/3–1/2 of the valve breadth, transapically ellipticalReferences(this study)Lange-Bertalot et al. (2003: 85)Siver & Hamilton (2005:364)(this study)Hamilton et al. (2019: 48)(this study)Liu et al. (2020: 172)Metzeltin & Lange-Bertalot et al. (2007: 177)Patrick & Reimer (1966: 402)Metzeltin & Lange-Bertalot et al. (2007: 180)RapheFiliformStraight, filiform**FiliformLinearLateralLateralLateralNarrow, straightStraight, moderately lateral (not filiform)Proximal raphe endingsStraight with drop- like shapedRather long, curved in opposite directionsStrongly deflected in opposite directionsRecurved in opposite directionsDeflected hooksDeflected hooks forming right anglesCurved in opposite directionsDeflected hooks forming right anglesCurved in opposite directionsSharp-angle to right angleStriation patternParallel at the center, slightly convergent at the apicesSubparallel and moderately oblique throughout or near the apices some irregularly convergent, comparatively coarseParallel to slightly obliqueRadiate to slightly oblique at the center, converging slightly at the apicesOblique to mildly convergent at apicesOblique at the center becoming towards converging slightly at the apexSlightly oblique along the transapical axis, become convergent near the apexObliquely subparallel at center, stronger towards converging the apexParallel, radiate at the centerSubparallel (never oblique), slightly convergentStriae (in 10 μm)16–1818.0–18.519–2319–2014–1715–1717–1813–14 (not 16–20)15–1613 (not 15–18)Voigt faults1 or 2**1 sometimes 21 or 21 or 2*1 or 22***2*2*Density of areolae5–7 in 2 µm25 in 10 µm4–5 in 2 µm*8–9 in 5 µm14–16 in 10 µm8–9 in 5 µm9–10 in 5 µm*14–15 in 10 µm (not 16–24)18 in 10 µm12–15 (not 18)Longitudinal canalsWideStrictly marginalWideWideWide**BroadWideBroadNumber of longitudinal canal along each margin1**113 or more2 or 31 or 211*1
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* measured in the illustrations, ** without description.