Sphaerotylus spp.

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 : 884

Sphaerotylus spp.

Fig. 6A–C .

Material.—Middle Eocene, middle-upper Eocene, south-central Ukraine.

Remarks. —The club-shaped spicules ( Fig. 6A, B ) resemble exotyles of Recent Sphaerotylus , especially those of S. vanhoeffeni Hentschel, 1914 ( Plotkin et al. 2017: fig. 29d). Also, the tylostyles ( Fig. 6C ,?D) and a fragment of the club-shaped spicule ( Fig. 6G ) could be part of an exotyle and assigned to one of the Sphaerotylus species (compare Plotkin et al. 2017: fig. 18).

Figures

Fig. 6. Spicule morphotypes from south-central Ukraine; Russkie Tiŝki, Middle Eocene (A, H, O, Y, Z), Kiselevka, upper Eocene (B, C), Markovka, middle Eocene (D), Russkie Tiŝki, upper Eocene (E), Kiselevka, upper Eocene (F, G, M), Pogonovka borehole, upper Eocene (I), Markovka, upper Eocene (J, K, N), Nikol’skoe, upper Eocene (L, P), Grigorevka borehole, upper Eocene (Q, R, S, T), Melovoe, upper Eocene (U, V), and Kiselevka, middle Eocene (W, X). A. Spherostyle. B–D. Tylostyles. E, F, I–K, M. Acanthostyles. G, H. Exotyles. L. Clavidisc. N, O. Acanthoxeas. P–R. Acanthostrongyles. S, T. Sigmas. U, V. Anisochelae. W. Isochela. X. Spheraster. Y, Z. Tylotes. After Ivanik (2003); modified.