Tetillidae, Sollas, 1886

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

Tetillidae indet.

Fig. 4D .

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

Remarks. —The stout centrotylote oxea of about 230 μm of length ( Fig. 4D ) is of great morphological resemblance, and the same size, as the spicules of tetillids (compare e.g., Acanthotetilla gorgonosclera, van Soest 1977 : fig. 4e). However, similar spicules can be found in geodiids ( van Soest 2017: fig. 55d) and thoosids (e.g., Carballo et al. 2004: fig. 21d). The long thin anatriaenes ( Fig. 4B, C ) and acanthoxea ( Fig. 6N ) could belong to tetillids as well. The acanthoxeas of similar morphology are found, e.g., in Acanthotetilla walteri Peixinho, Fernandez, Oliveira, Caires, and Hajdu, 2007 ( Peixinho et al. 2007: fig. 7c), but their coelosphaerid affinity is more likely.

Figures

Fig. 4. Spicule morphotypes from south-central Ukraine; Russkie Tiŝki, middle Eocene (A, O), Nikol’skoe, upper Eocene (B, C), Kantemirovka, middle Eocene (D), Melovoe, upper Eocene (E), Staroverovka, middle Eocene (F), Kantemirovka, upper Eocene (G, I), Markovka, upper Eocene (H, N), Pogonovka borehole, upper Eocene (J, L, M), Markovka, middle Eocene (K, P, T), Kiselevka, middle Eocene (Q), Lipcy, middle Eocene (R), and Kiselevka, upper Eocene (S). A. Protriaene. B, C. Anatriaenes. D. Centrotylote oxea. E–H. Amphitriaenes. I–K. Acanthotriods. L, M. Verticillate oxeas. N. Verticillate style. O–R, T. Acanthoxeas. S. Sanidaster. After Ivanik (2003); modified.

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.