Microcheilinella egerensis Forel, 2013
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publication ID |
https://doi.org/ 10.4202/app.2011.0126 |
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publication LSID |
lsid:zoobank.org:pub:15268E3E-5628-419C-B76F-6710BA70723E |
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persistent identifier |
https://treatment.plazi.org/id/93CA95B6-A216-4FAA-8479-8A36DB29D8B5 |
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taxon LSID |
lsid:zoobank.org:act:93CA95B6-A216-4FAA-8479-8A36DB29D8B5 |
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treatment provided by |
Felipe |
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scientific name |
Microcheilinella egerensis Forel |
| status |
sp. nov. |
Microcheilinella egerensis Forel sp. nov.
Figs. 15Q–X View Fig , 16 View Fig .
Etymology: In reference to the city of Eger, Hungary.
Type material: Holotype: one complete carapace, Fig. 15Q View Fig , UPMC P6M2879 , sample 08BAN61 . Paratype: one complete carapace, Fig. 15S View Fig , UPMC P6M2881 , sample 08BAN61 .
Type locality: Bálvány North section, Bükk Mountains, Hungary .
150 200 250 300 350 400 450 500 550 600 L (μm)
Type horizon: Level 7, Gerennavár Limestone Formation , Griesbachian, Lower Triassic .
Material.—35 complete and 5 broken carapaces, samples 08BAN61, 62, 63, and 67 (see Fig. 2B), levels 7, 8, Gerenna−
http://dx.doi.org/10.4202/app.2011.0126
vár Limestone Formation, Bálvány North section, Hungary, Griesbachian, Lower Triassic.
Diagnosis.—A species of Microcheilinella with a quadrantshaped AB and a PB with quite large radius of curvature; VB and DB of both valves nearly straight.
Dimensions.—L 155–395 µm; H 100–250 µm (see Fig. 16 View Fig ). Description.—Carapace moderately elongated (H/L 0.60); LV: DB gently convex to straight; AB with quite large radius of curvature (particularly in larval stages) and ventral part quite vertical; VB slightly convex to straight; PB regularly rounded with maximum of curvature located close to mid−H; RV: DB straight and inclined backwards; anterior part of the carapace in shape of a quadrant, quite vertical in ventral part; VB straight; PB equivalent to PB of LV;
LV overlaps RV all around the carapace; relative weak overlap with a maximum located at posterior part of DB; hinge line invaginated; larval stages show a larger AB than adults. Internal features unknown.
Discussion.— Microcheilinella egerensis sp. nov. is quite close to two species described from the Upper Permian of the Meishan section (Crasquin et al. 2010a), Microcheilinella shicheni Crasquin, 2010 and Microcheilinella rectodorsata Forel, 2010 , both from the Changhsingian. M. shicheni has a PB with a smaller radius of curvature, a convex DB in both valves and more−or−less parallel and horizontal DB and VB. M. rectodorsata has quite the same shape at the AB but PB shows a smaller radius of curvature and the carapace is more elongated. M. hungarica Kozur, 1985 from the Lower Wuchiapingian of Bükk Mountains ( Kozur 1985b) is longer and has a more slender PB particularly in RV.
Very few species of Microcheilinella are recorded from the Triassic: M. sp. from the Spathian of Pakistan ( Sohn 1970), M. cf. venusta Chen, 1958 and M.? sp. 1 sensu Crasquin−Soleau et al. (2006) from the Spathian of Guangxi. They belong to the survivors of the PTB mass extinction.
Stratigraphic and geographic range.—Bálvány North section, levels 7, 8, samples 08BAN61, 62, 63, and 67 (see Fig. 2B), Gerennavár Limestone Formation, Griesbachian, Lower Triassic.
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