Eucytherura eberti, Wannenmacher & Dietze & Franz & Schweigert, 2021
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publication ID |
https://dx.doi.org/10.3897/zitteliana.95.56296 |
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publication LSID |
lsid:zoobank.org:pub:F894DD92-D76C-42E1-A4A2-852E4D2ADD48 |
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persistent identifier |
https://treatment.plazi.org/id/12B4883C-8F55-481A-A41E-B2665DB8069F |
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taxon LSID |
lsid:zoobank.org:act:12B4883C-8F55-481A-A41E-B2665DB8069F |
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treatment provided by |
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scientific name |
Eucytherura eberti |
| status |
sp. nov. |
Eucytherura eberti sp. nov.
Fig. 6: 9-11 View Figure 6
Eucytherura aff. scottia (Whatley, 1970). - 2018 Franz et al., p. 72, plate 3: 17.
Eucytherura aff. scottia (Whatley). - 2019 Dietze et al., fig. 11.
Etymology.
In honour of the German palaeontologist Martin Ebert, who initiated the investigation of the Geisingen clay pit with his extensive preliminary work.
Holotype.
carapace, figured on Fig. 6 View Figure 6 : 9, SMNS 70521/9.
Paratypes.
two carapaces, figured on Fig. 6 View Figure 6 : 10, 11, SMNS 70521/10-11.
Type locality.
Heiligenbach valley near Hechingen-Beuren (SW Germany).
Type horizon.
Achdorf Formation, claystone below the Inopernabank, bed no. 39 in Fig. 4 View Figure 4 ; Bradfordensis Zone.
Material.
10 C, 28 RV, 34 LV from the Heiligenbach, Thanheim and Roschbach sections and the Geisingen clay pit.
Diagnosis.
A new species of Eucytherura with broad, smooth posterodorsal, frontal and ventral ribs. Intercostate areas weakly reticulate.
Description.
Very small, subrectangular. Left valve slightly larger than right with anterodorsal and posterodorsal overlap. Anterior margin weakly rounded with extremity below mid-height; posterior margin pointed in right and bluntly rounded in left valve, apex above mid-height. Posterior cardinal angle pronounced in both valves; anterior cardinal angle more rounded in right than in left valve. Dorsal margin slightly convex to straight; ventral margin medianly slightly convex. Greatest height at anterior cardinal angle; greatest width antero-ventrally; greatest length above mid-height. Ornament consists of a series of broad longitudinal ribs and swellings, and with weakly reticulate intervening areas. A broad, posteriorly weakly alate rib extends from a postero-ventral position across the ventro-lateral surface of the valve, terminating antero-ventrally. A similar broad rib extends mid-posteriorly to mid-dorsally. The eye tubercule is well developed and is connected to a narrower frontal rib, which parallels the anterodorsal margin. A less prominent second rib or elongate swelling parallels the latter mid-anteriorly. Intercostate areas are weakly reticulate, with a characteristic row of small elongate pits above the muscle-scar field. 3-4 small marginal denticles occur anteriorly. Normal pores few and wide-spaced. Internal details not observed.
Comparisons.
Euytherura eberti closely resembles Eucytherura scottia Whatley, 1970 from the Callovian and Oxfordian of Scotland. It differs mainly in the length of the dorsal rib, the absence of the anterior tubercles, being replaced by two parallel ribs and the pits above the musclescar-field.
Distribution.
Lower Aalenian to Upper Aalenian, Opalinum to Bradfordensis zones (Gigantea Subzone); SW Germany.
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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Eucytherura eberti
| Wannenmacher, Norbert, Dietze, Volker, Franz, Matthias & Schweigert, Guenter 2021 |
Eucytherura aff. scottia
| Wannenmacher & Dietze & Franz & Schweigert 2021 |
Eucytherura aff. scottia
| Wannenmacher & Dietze & Franz & Schweigert 2021 |