Pinnularia australoglobiceps Zidarova & Kopalová & Vijver 2012, sp. nov.
Pinnularia australoglobiceps sp. nov. (Figs 189–196) Valvae lineares-lanceolatae ad ellipticae-lanceolatae in speciminibus minoribus marginibus clare convexis, apicibus late capitatis, semper distincte angustioribus quam media parte valvae. Longitudo 25–37 µm, latitudo 8.4–9.6 µm. Area axialis angus...
| Main Authors: | , , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2012
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| Subjects: | |
| Online Access: | https://zenodo.org/record/4929583 https://doi.org/10.5281/zenodo.4929583 |
| Summary: | Pinnularia australoglobiceps sp. nov. (Figs 189–196) Valvae lineares-lanceolatae ad ellipticae-lanceolatae in speciminibus minoribus marginibus clare convexis, apicibus late capitatis, semper distincte angustioribus quam media parte valvae. Longitudo 25–37 µm, latitudo 8.4–9.6 µm. Area axialis angusta, leviter dilatans in aream centralem. Area centralis formans fasciam cuneiformem latam. Raphe filiformsi, ramis leviter curvatis. Terminationes raphis proximales leviter deflexae cum poris indistinctis. Fissurae raphis distales unilateraliter flexae. Striae in media parte valvae curvatae, moderate ad fortiter radiatae, parallelae ad leviter convergentes ad apices, 13–15 in 10 µm. Striae abbreviatae nonnulae in area centrali. Lineae speciosae longitudinales nullae. Valves linear-lanceolate to elliptic-lanceolate in smaller individuals, with clearly convex margins and broadly capitate apices, always distinctly narrower than the valve middle; in smaller specimens barely offset. Shoulders between apices and valve middle absent. Valve dimensions (n=20): length 25–37 µm, width 8.4– 9.6 µm. Axial area narrow, only slightly widened towards the central area. Central area forming a large bowtie-shaped fascia. Raphe filiform with slightly curved branches and straight to slightly deflected central endings bearing simple raphe pores. Distal raphe fissures, bent to one side. Striae in the valve middle curved, moderately to strongly radiate, becoming parallel to weakly convergent near the apices, 13–15 in 10 µm. Shortened striae sometimes present near the central area. Longitudinal lines absent. Type:— Byers Peninsula, Livingston Island, South Shetland Islands, sample BY066, leg. B. Van de Vijver, coll. date 18/01/2009, slide no. BR-4260 (holotype BR), slide PLP-205 (isotype University of Antwerp, Belgium), slide ZU8/18 (isotype BRM). Habitat and Distribution:— Pinnularia australoglobiceps is uncommon on Livingston Island and is mainly found in aquatic habitats. The type population was observed in a small lake near the southern ... |
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