AnimaliaSpongillidaLubomirskiidaeBukshukNatalia A.MaikovaOlga O.A new species of Baikal endemic sponges (Porifera, Demospongiae, Spongillida, Lubomirskiidae)Zookeys221202090611313010.3897/zookeys.906.395346B82B1DF-DBB6-57D8-A41F-FBD66E04B59D Swartschewskia Makushok, 1927Included species.

Swartschewskia papyracea (Dybowski, 1880), Swartschewskia irregularis (Swartschewsky, 1902).

Type species.

Swartschewskia papyracea (Dybowski, 1880).

Genus diagnosis.

Body shape encrusting to globose or branched. Ectosomal skeleton hard and well developed as more or less regular alveolar network of thick tangential spicular fibres. Choanosomal skeleton sparsely developed with scarce spicules irregularly arranged in few weak fibres. Abundant spongin. Megascleres strongyles, from spiny to smooth (modified from Manconi and Pronzato 2002).

ManconiRPronzatoR (2002) Suborder Spongillina subord. nov.: Freshwater sponges. In: HooperJNAVan SoestRWM (Eds) Systema Porifera.A guide to the classification of sponges. Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow, 921–1020. https://doi.org/10.1007/978-1-4615-0747-5_97