Sellaphora vincentiana Alibert & Hamilton & Pienitz & Antoniades 2023, sp. nov.
Notice bibliographique
Résumé
Sellaphora vincentiana sp. nov. (Figs 10 AU-BJ; 14 A-F) HOLOTYPE. — Canada. Québec, Lake 22AA, 56°33’24”N, 76°28’47”W, 128 m a.s.l., 22.VIII.2015, D. Antoniades (microscope slide designated as the holotype, holo-, CANA [CANA 129481]). ISOTYPE. — Canada. Québec, Lake 22AA, 56°33’24”N, 76°28’47”W, 128 m a.s.l., 22.VIII.2015, D. Antoniades (iso-, ANSP [ANSP-GC68070]). TYPE LOCALITY. — Canada. Québec, Lake 22AA, 56°33’24”N, 76°28’47”W, 128 m a.s.l. ETYMOLOGY. — The epithet ‘vincentiana’ is named in honour of our dear colleague Warwick Vincent, whose contributions to diatom research are substantial and cannot be measured. ECOLOGY AND DISTRIBUTION. — This species was found in two lakes of the study: 22-Z and 22-AA. It reached 4.6% relative abundance in lake 22-AA and only 0.6% in 22-Z. The low number of occurrences prevented us from discerning clear relationships with lake chemistry, but both sites where it occurred had circumneutral conditions, and Lake 22-AA had the highest TP concentration in the dataset. REGISTRATION. — http://phycobank.org/103921. DESCRIPTION Frustules rectangular and narrow in girdle view. Valves linear-elliptic to elliptic with restricted rostrate ends. Valve dimensions (n =25): length 8-18.5 µm, width 2.5-4.5 µm. External valve face flat, margin rounded. The stria density is 49-51 in 10 µm. Axial area curved and narrow; external sternum raised. Central area weakly expanded, with 4-6 marginal striae between proximal raphe fissures, 1-2 striae shorter than the others (Fig. 14 A-C). Raphe curved, with no kink-like irregularity halfway between mid-valve and apex; externally, central raphe fissures linearly expanded with rounded ends sometimes bent to primary side (Fig. 14B, C).Terminal raphe fissures bent down onto upper region of mantle, opening into a small circular depression (Fig. 14D). Internally, raphe on sternum, straight, with no kink-like irregularity. Proximal raphe fissures teardrop-shaped and positioned on raised central nodule (Fig. 14E); terminal fissures end on small helictoglossae, isolated from apex mantle (Fig. 14F). Striae more widely spaced around central area, and parallel throughout. Striae continuous, straight to weakly arched from valve face to mantle. Voigt faults indistinct. Striae continuous around apices. Areolae round to rectangular, 8-10 per stria, 3-4 at apices (Fig. 14D). Areolae covered with a recessed fine poroid velum with circular rows of small and almost indistinct pores around outside edge and random distribution on inner area. Areolae along axial sternum more evidently depressed. Internally, areolae between virgae weakly recessed with volate pore cover. The small linear to linear-elliptic shape with subrostrate to rostrate apices is a common shape of many species and genera which creates confusion in identifications.Furthermore, the high striae counts may create confusion between Adlafia, Eolimna and Sellaphora. As a result, taxonomic confusion persists today when trying to distinguish taxa within these genera. After SEM study, the morphology of these valves is clearly aligned with the genus Sellaphora, with recessed volate occlusion of the areolae, raised external axial and terminal areas, distinctly larger areolae along the axial area, and bent terminal raphe fissures down onto the mantle. A distinct asymmetric internal central nodule also helps to distinguish this taxon from Adlafia and Eolimna species. Sellaphora stauroneioides (Lange-Bertalot) Vesela & Johansen is comparable to Sellaphora vincentiana sp. nov., but is larger, with clear hyaline areas at the apices and is more linear than linear-elliptic. Electron microscopic comparisons are needed to distinguish these small Sellaphora species. In addition, Navicula arvensoides Hustedt and Sellaphora pseudoarvensis (Hustedt) Wetzel & Ector are small taxa with similar valve outlines, linear valve margins and distinct rostrate or subcapitate apices (Simonsen 1987; Table 3). With no SEM examination of these taxa, detailed comparisons are limited to LM which shows a triundulate valve margin with broad rostrate apices, and visible striae in N. arvensoides; in contrast, S. pseudoarvensis has linear valve margins, curved raphe branches, no visible striae and subcapitate apices.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,002 | 0,002 |
| Études des sciences et des technologies | 0,002 | 0,001 |
| Communication savante | 0,001 | 0,002 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,002 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,010 | 0,006 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».