Taxonomy and palaeobiogeography of charophytes from the Upper Eocene- Lower Oligocene of the Eastern Ebro Basin (Catalonia, NE Spain) Author Sanjuan, Josep Author Martín-Closas, Carles text Geodiversitas 2014 2014-09-26 36 3 385 420 http://dx.doi.org/10.5252/g2014n3a3 journal article 6394 10.5252/g2014n3a3 d28ddaf8-3b50-46bb-89a4-0e325e35b705 1638-9395 4538531 Harrisichara lineata Grambast, 1957 ( Fig. 9 D-I) Harrisichara lineata Grambast, 1957: 27 , pl. 4, figs 5-7. DISTRIBUTION. — Harrisichara lineata is distributed in the Middle Bartonian to Upper Priabonian of Europe. In France , it occurs in the Paris Basin ( Riveline 1986 ), the north-western part of the Languedoc Basin (Feist-Castel 1971) and the Aquitaine ( Feist & Ringeade 1977 ) and Provence (Feist-Castel 1977a) basins.In Germany , H. lineata occurs in the Rhine Graben Basin ( Schwarz & Griessemer 1994 ). Harrisichara lineata has also been reported in the NorthofSpain.IthasrecentlybeendocumentedbyMochales et al. (2012) within Upper Eocene deposits of the Ainsa Basin (south-central Pyrenees). In the eastern Ebro Basin, this species only occurs in Sant Boi de Lluçanès ( Table 2 ). DESCRIPTION Gyrogonite large, 642-960 µm high (mean 753 µm ), and 520-853µm wide (mean 659 µm ), sub-spherical, ellipsoidal or oval in shape with an isopolarity index of 83-133 (mean 115). Spiral cells flat or concave. Eight to eleven (frequently nine), convolutions are visible laterally. While most of the gyrogonites show a characteristic regular midcellular crest, some specimens are smaller and show an ornamentation consisting of small nodules arranged along the central line of the spiral cells ( Fig. 9 G-I). Apex flat to rounded, frequently ornamented with comma-shaped tubercles. Base elongated, terminating in a small column. REMARKS Ŋe specimens found at El Perers (Sant Boi de Lluçanès, NE Ebro Basin) display variable size and ornamentation patterns, the two characters being closely related. Smaller specimens present small and irregular, shortly spaced tubercles ( Fig.9I ), and in some cases small nodules are poorly connected showing an incipient midcellular crest ( Fig. 9H ). In contrast, most of the gyrogonites are larger and show a regular midcellular crest. Ŋe largest gyrogonites show a slightly rippled midcellular crest, especially marked in the apical zone ( Fig. 9G ). Ŋis range of variation is possibly controlled by the palaeoenvironment.