Eucytherura foveolata, Wannenmacher & Dietze & Franz & Schweigert, 2021

Wannenmacher, Norbert, Dietze, Volker, Franz, Matthias & Schweigert, Guenter, 2021, New records of ostracods and ammonites from the Aalenian (mainly Concavum Zone) of the Zollernalb (Swabian Alb, SW Germany), Zitteliana 95, pp. 1-55 : 7

publication ID	https://dx.doi.org/10.3897/zitteliana.95.56296
publication LSID	lsid:zoobank.org:pub:F894DD92-D76C-42E1-A4A2-852E4D2ADD48
persistent identifier	https://treatment.plazi.org/id/7D6E8E7E-FA22-4597-837D-3E25EBF70FD7
taxon LSID	lsid:zoobank.org:act:7D6E8E7E-FA22-4597-837D-3E25EBF70FD7
treatment provided by	Zitteliana by Pensoft
scientific name	Eucytherura foveolata
status	sp. nov.

Treatment

Eucytherura foveolata sp. nov.

Fig. 6: 12-14 View Figure 6

Eucytherura sp. 4. - 2018 Franz et al., p. 72, plate 3: 22

Etymology.

From fovea (lat.) = pit; referring to the characteristic pits on the lateral surface.

Holotype.

One carapace, figured in Fig. 6 View Figure 6 : 12, SMNS 70521/12.

Paratypes.

Two carapaces, figured in Fig. 6 View Figure 6 : 13, 14, SMNS 70521/13-14.

Type locality.

Drillcore KB 1/93 Geisingen (SW Germany).

Type horizon.

Opalinuston Formation, Zillhausen Subformation, sample G08Fr, Lower Aalenian.

Material.

19 C, 2 RV, 2 LV from samples He 19-3-12 and from the Geisingen clay pit.

Diagnosis.

A small-sized species of the genus Eucytherura with the following characteristics: pitted lateral surface with a fine median rib.

Description.

Very small, subrectangular. Left valve slightly larger than right with dorsal overlap. Anterior margin rounded with extremity slightly below mid-height; posterior margin pointed in right and bluntly rounded in left valve, apex above mid-height. Posterior cardinal angle rounded; anterior cardinal angle pronounced in both valves. Dorsal margin straight in left, slightly convex in right valve; ventral margin straight or slightly concave. Greatest height at anterior cardinal angle; greatest length above mid-height. Ornament consists of a fine median, horizontal or subdiagonal rib, accompanied on both sides by shallow, about 15 μm wide, round or subangular pits with a rough surface. A third row of such pits running antero-medianly - postero-ventrally; further pits in variable numbers and positions scattered on the lateral surface. Particularly striking are 4 rhomboidally grouped pits (Fig. 6 View Figure 6 : 12) in the mid-dorsal area. Eye-tubercle only weakly developed. Internal details not observed.

Comparisons.

All other previously known species of Eucytherura have a well-developed ornamentation with sharp or broad ribs and/or reticulate surfaces.

Occurrence.

Lower Aalenian, Opalinum Zone; SW Germany.

Figures

Figure 6. (1) Cardobairdia tesakovae Franz et al., SMNS 70521 / 1, LV, L: 0.426 mm; sample He 19 - 6; (2) Patellacythere cf. vulsa, SMNS 70521 / 2, LV, L: 0.51 mm; sample He 19 - 9; (3) Procytherura celtica Ainsworth, SMNS 70521 / 3, RV, L: 0.301 mm; sample He 19 - 12. (4, 5) Procytherura euglyphea Ainsworth, (4) SMNS 70521 / 4, RV, L: 0.320 mm; sample He 19 - 1; (5) SMNS 70521 / 5, LV, L: 0.327 mm; sample He 19 - 12. (6, 7) Procytherura multicostata Ainsworth, (6) SMNS 70521 / 6, LV, L: 0.336 mm; sample He 19 - 9; (7) SMNS 70521 / 7, RV, L: 0.319 mm; sample He 19 - 16. (8) Procytherura sp. 2 Franz et al., SMNS 70521 / 8, RV, L: 0.325 mm; He 19 - 8. (9 - 11) Eucytherura eberti sp. nov., (9) holotype, SMNS 70521 / 9, C, left view, L: 0.306 mm; sample He 19 - 18; (10) Paratype, SMNS 70521 / 10, C, right view, L: 0.292 mm; sample He 19 - 21; (11) paratype, SMNS 70521 / 11, C, dorsal view, L: 0.318 mm; sample He 19 - 26. (12 - 14) Eucytherura foveolata sp. nov., (12) holotype, SMNS 70521 / 12, C, left view, L: 0.327 mm; sample G 08 Fr; (13) paratype, SMNS 70521 / 13, C, right view, L: 0.318 mm; sample G 12 Fr; (14) paratype, SMNS 70521 / 14, C, right view (detail), image width: 0.07 mm; sample G 12 Fr; (15) Eucytherura liassica Bate and Coleman, SMNS 70521 / 15, LV, L: 0.304 mm; sample He 19 - 17. (16) Eucytherura michelseni (Finger), SMNS 70521 / 16, LV, L: 0.324 mm; sample He 19 - 18. (1 - 6, 8, 12 - 14) Opalinuston Formation, Lower Aalenian, Opalinum Zone; (7, 9 - 11, 15 - 16) Achdorf Formation, Upper Aalenian, (7) Murchisonae Zone, (15) Bradfordensis Zone (Bradfordensis Subzone), (9, 10, 16) Bradfordensis Zone (Gigantea Subzone), (11) Concavum Zone. Scale bars (if not indicated otherwise): 20 μm.