Eolingularia Sous-embranchement (subphylum) des Linguliformea Classe des Lingulata Ordre des Lingulida Super-famille des Linguloidea Famille des Lingulidae

Genus Eolingularia Bitner & Emig, 2016

[Type-species = L. siberica]   -   see figure below that belongs to the diagnoses of the species

Shell elongate-oval in outline, lateral margins subparallel, anterior margin broadly rounded. Valves weakly to strongly convex. Dorsal valve with posterior margin rounded, narrow median beak sometimes present, and a narrow internal central ridge extending over about 1 mm posterior to anterior oblique muscle scars. Ventral valve with triangular umbo formed by small to large internal propareas, continuous with posterolateral margins and separated by a deep pedicle groove; pair of narrow subparallel, V-shaped, grooves extends internally from the anterior adductor pair to posterior adductor where grooves join. Posterior adductor scar heart-like in outline. Main ventral and dorsal canals curved and convergent ante- riorly

Carboniferous-Triassic. Occurrences: Russia, China, and Spain. Diagnosis from Bitner & Emig (2016) with complete description.

Species of Eolingularia

E. siberica (Biernat et Emig, 1993) -------------- ? Lingula subspatulata Hall et Meek, 1855 ? Lingula mytiloides Sowerby, 1813 ? Lingula ovalis Sowerby, 1855 and L. subovalis Davidson, 1852

Eolingularia siberica (Bitner & Emig, 1993) Lingula polaris Lundgren, 1883; Dagys, 1965. Lingularia siberica Biernat & Emig, 1993 ?Lingula polariformis ex. aff. polaris Wurm, 1911. ?Lingula olenekensis Dagys, 1965. Holotype: ZPAL Bp.XXIV/3. Type locality: Olenek River, Northern Siberia (see Dagys, 1965, p. 12). Type horizon: Middle Triassic, Anisian. Etymology: Siberica because the specimens previously referred to polaris were collected in the northern part of Siberia. Diagnosis - (Biernat & Emig, 1993) including the figures Numerous fine radial striae and commonly concentric microlines between thicker growth lines generally visible on the shell. Umbonal region rounded on dorsal valve, pointed on ventral valve; small propareas separated by a deep and wide striated pedicle groove, not continuous with internal valve face. Body muscles characterized by internal anterior oblique located near anterior oblique; internal posterior oblique not observed. Mantle canals almost straight, convergent.