Haplosclerida Topsent, 1928

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 : 882

Order Haplosclerida Topsent, 1928 Family Petrosiidae van Soest, 1980 Petrosiidae indet.

Fig. 5V–X.

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

Remarks. —The strongyles ( Fig. 5V–X) may belong to one of the species of Petrosia Vosmaer, 1885 (compare Petrosia davilai Alcolado, 1979 , Silva and Zea 2017: fig. 2) or Xestospongia Laubenfels, 1932 ( X. deweerdtae, Silva and Zea 2017 : fig. 5).