Histodermella 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 : 884-885

Histodermella spp.

Fig. 6N, O, Y, Z .

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

Remarks. —The long oxeas that are spined along their whole length except for their tips ( Ivanik 2003: pls. 20: 8, 9, 21: 1; Fig. 6N, O ) could probably be assigned to Histodermella . This genus includes 4 extant species ( van Soest et al. 2018). Three of those species ( Histodermella kagigunensis Lehnert, Stone, and Heimler, 2013 , H. natalenisis [ Kirkpatrick, 1903], and H. inglofi Lundbeck, 1910 ) possess this type of spicules (compare Kirkpatrick 1903: pl. 6: 18; Lehrnert et al. 2013: fig. 1; Lundbeck 1910: pl. 4: 4).

In addition, the fusiform tylotes ( Fig. 6Y, Z ) can be found in H. natalensis as well (compare Kirkpatrick 1903: pl. 7: 18a). However, a coelosphaerid or myxillid (see below) affinity of that spicule (compare Coelosphaera [ Coelosphaera ] tubifex Thomson, 1873, Boury-Esnault et al. 1994: fig. 80a) cannot be ruled out either but is less possible.

A B C D E F G I J K

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.