Tianzhushanella sp.
publication ID |
https://doi.org/ 10.4202/app.00289.2016 |
persistent identifier |
https://treatment.plazi.org/id/03AD87A8-FFD0-6D6C-FFF3-FACA67FA84C1 |
treatment provided by |
Felipe |
scientific name |
Tianzhushanella sp. |
status |
|
Fig. 48 View Fig .
Material.—Four internal moulds SMNH X5834, 5835, 5837, 5838, from samples 1/22 (section 1, Fig. 4 View Fig ), K1a/67 (section 2, Fig. 1), and K2/60 (section 3, Fig. 3), from the Medvezhya and Kugda-Yuryakh formations, western Anabar Uplift; and SMNH X5836, from sample M71-2/62, from the upper Kessyusa Formation, Olenyok Uplift, Siberian Platform. Correlated with lower part of Cambrian Stage 2.
Description.—Bilaterally symmetrical shell with broad oval aperture and submarginal apex. Subapical margin of aperture is broadly and strongly arched. Inner surface of apical area has a pair of radially elongated, closely spaced, bilaterally symmetrically situated cavities replicated by a pair of spine-like protrusions on the internal mould ( Fig. 48C View Fig ). The elevated median part of the inner surface near the apex is covered with polygonal imprints, whereas larger imprints occur distally ( Fig. 48E View Fig ).
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