Luticola doliiformis Kopalová & Van de Vijver, 2011
publication ID |
https://doi.org/ 10.11646/phytotaxa.27.1.5 |
DOI |
https://doi.org/10.5281/zenodo.4894477 |
persistent identifier |
https://treatment.plazi.org/id/038387FD-604D-FFDE-0DE6-FAFAFEF88AED |
treatment provided by |
Felipe |
scientific name |
Luticola doliiformis Kopalová & Van de Vijver |
status |
sp. nov. |
Luticola doliiformis Kopalová & Van de Vijver , sp. nov. ( Figs 14–28 View FIGURES 14–28 )
Valvae lanceolatae marginibus convexis, apicibusque capitatis. Longitudo 17–22 µm, latitudo 7–8 µm. Area axialis lata, lanceolata, clare dilatata in aream centralem, leviterque dilatata in apices. Area centralis formans staurum rectangularem, marginatum serie una areolarum rotundatatrum. Stigma solitaria rotundata prope marginem valvae adest. Raphe filiformis, clare curvata, terminationibus proximalibus unilateraliter deflexis, fissurisque distalibus curtis, rectis. Striae transapicales radiatae in centro valvae, convergentes ad apices, 18–20 in 10 µm. Areolae parvae, semper rotundae, 2-3 per striam.
Type: — ANTARCTICA. James Ross Island , Ulu Peninsula, Lachman Crags, sample D07, leg. L. Nedbalová, coll. date 27/01/2008, slide no. BR-4250 (holotype BR, Fig. 20 View FIGURES 14–28 is the encircled holotype specimen), slide PLP-195 (isotype University of Antwerp, Belgium), BRM-ZU8/07 (isotype BRM) .
Valves lanceolate with convex margins and capitate apices ( Figs 14–24 View FIGURES 14–28 ). Valve length 17–22 µm, valve width 7–8 µm (n=15). Axial area broad, lanceolate, clearly widening towards central area, only slightly widening towards apices ( Fig. 25 View FIGURES 14–28 ). Central area forming a broad, rectangular stauros, bordered by one series of small, rounded areolae ( Fig. 27 View FIGURES 14–28 ). One small, solitary, rounded stigma present, close to valve margin ( Fig. 27 View FIGURES 14–28 ). External raphe branches clearly curved, with weakly unilaterally deflected, simple proximal endings away from stigma ( Fig. 27 View FIGURES 14–28 ). Distal raphe fissures very short, straight ( Fig. 28 View FIGURES 14–28 ). Transapical striae radiate near valve centre becoming convergent towards apices, 18–20 in 10 µm ( Fig. 25 View FIGURES 14–28 ). Striae composed of 2-3 small, always rounded areolae ( Fig. 25 View FIGURES 14–28 ). Internal structure hardly visible since only one valve was found ( Fig. 26 View FIGURES 14–28 ). Clearly developed stauros present. Detail of internal stigma opening obscured by debris. Proximal raphe endings terminating on edge of stauros.
Habitat, Ecology and Distribution:— Luticola doliiformis was found in small cracks on wet soil on the table mountain Lachman Crags close to the glacier front. The sample was dominated by Luticola cohnii , Hantzschia amphioxys ( Ehrenberg 1843: 413) Grunow (in Cleve & Grunow 1880: 103) and several unidentified species of Diadesmis .
Etymology: — This specific epithet doliiformis refers to its close resemblance to L. dolia (- formis: Latin for ‘resembling’).
Observations: — The James Ross Island (JRI) specimen of Luticola doliiformis bears a strong resemblance to L. dolia , a taxon described from the McMurdo Dry Valleys on the Antarctic Continent ( Esposito et al. 2008). The valve dimensions do not permit discrimination between the two taxa but there are other important differences. Unfortunately, in the original description of Esposito et al. (2008), the ultrastructure of the valves and girdle could not be examined as specimens were rare in the samples. Therefore, isotype material (INSTAAR Collection slide 532, isotype slide for Luticola dolia Spaulding & Esposito, Esposito et al. 2008: 1385 ) was re-examined using SEM and two valves were found showing some of the morphological features enabling separation between L. dolia and L. doliiformis ( Figs 29–34 View FIGURES 29–34 ). Based on the description in Esposito et al. (2008) and our observations of the isotype material, several differences can be noted. The distal raphe fissures in the JRI population are very short contrary to L. dolia where slightly elongated fissures were noted ( Fig. 33 View FIGURES 29–34 ). The valve apices in L. dolia are usually much narrower than in L. doliiformis that have normally broadly rounded, enlarged apices ( Figs 29–31 View FIGURES 29–34 ). The shape and size of the areolae also differs with transapically elongated, larger areolae in L. dolia , whereas L. doliiformis has small, always rounded areolae ( Figs 32, 33 View FIGURES 29–34 ). Moreover, the number of striae in 10 µm is higher in the JRI population contrary to that stated in the original description (18–20 vs 14–18). Although the external stigma opening could not be observed in the isotype material, it is clear that, based on the LM and the internal SEM views of L. dolia ( Fig. 34 View FIGURES 29–34 ), the stigma opening is positioned more to the valve middle whereas in L. doliiformis , the stigma opening is closer to the valve margin ( Fig. 25 View FIGURES 14–28 ). Based on these differences, separation of these taxa can be made.
BR |
Embrapa Agrobiology Diazothrophic Microbial Culture Collection |
BRM |
Alfred-Wegener-Institut für Polar- und Meeresforschung |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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