TABLE 5 in Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec

TABLE 5. — Comparison of distinct morphological traits among the genera Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère, and Sellaphora Mereschkowski.
KobayasiellaAdlafiaNupelaSellaphoraFrustuleLight to moderately silicified ––––ShapeLinear-elliptic, linear- lanceolate–––RapheStraight and filiformLinear to weakly curved–Slightly deflected and curvedUmbilicusKink-like irregularity closer to valve apices along the raphe fissureAbsent––Terminal raphe fissureHooks on the valve face, does not continue onto the mantleBends in the same direction and extends to the mantle–Terminates in a long helictoglossaAreolae–Large and round, covered externally by a multiseriate hymen and a silica layer at the outer periphery of each areolaElliptical in outline, externally covered with a hymenPresence of hymen that obscures small areolae detailsStriaeAlveolae-like apertures with – recessed pores, arranged radially at the mid-valve changing to convergent at the Voigt fault and then extending to the apices–––Internal structureNarrow raised sternum, – straight or T-shaped proximal ends of the raphe, small raised helictoglossa at the distal end––Central raphe ends deflected, terminal raphe fissure terminates in a long helictoglossaGenetic affiliation–Distant from Kobayasiella, aligned with Geissleria and PlaconeisChloroplast genetic affinity to Pinnularia and StauroneisGenetically associated with Eolimna