Pleromidae, Sollas, 1888

Łukowiak, Magdalena, Pisera, Andrzej & Stefanska, Tetiana, 2019, Uncovering the hidden diversity of Paleogene sponge fauna of the East European Platform through reassessment of the record of isolated spicules, Acta Palaeontologica Polonica 64 (4), pp. 871-895 : 880

Pleromidae indet.

Fig. 9J, K, N, Q, S–W, Y .

Material.—Lower Eocene, Upper Cretaceous, south-central Ukraine.

Remarks.— Pleromidae are commonly represented by smooth megaclones. Despite that some of the illustrated megaclones ( Fig. 9J, K, N, Q, T–W, Y ) are Late Cretaceous, the same type of spicules was also found in the Paleogene deposits (e.g., Fig. 9S , see figure caption).

Figures

Fig. 9. Spicule morphotypes from south-central Ukraine (A–V, X–Z) and Lithuania (W); Markovka, middle Eocene (A, D, E), Verhnee, lower Eocene (B, Z), Glâdov Âr, Upper Creatceous (C, J, K, P, Q, T, U, V, Y), Pesčanoe, upper Eocene (F, O), Kiselevka, middle Eocene (G, L, R), Markovka, upper Eocene (H, X), Nikol’skoe, upper Eocene (I, S), Lipcy, middle Eocene (M), Monastyrek, lower Eocene (N), and Neravai borehole, Paleocene (W). A, C, E, H, L, O, P, R. Phyllotriaenes. B. Sphaeroclone. D, F, G. Discotriaenes. I. Anchorate spicule. J, K, N, Q, S–W, Y. Megaclones. M. Siliceous plate. X, Z. Tetracrepid desmas. After Ivanik (2003); modified.