Description of a bryozoan fauna from mud mounds of the Lebanza Formation (Lower Devonian) in the Arauz area (Pisuerga-Carrión Province, Cantabrian Zone, NW Spain)

Abstract

ABSTRACT A bryozoan fauna containing 16 species is described from a set of small mud mounds occurring in the Lebanza Formation (Lower Devonian) of the Arauz area, NW Spain. One genus with one species is new: the cystoporate Petalosis clarus n. gen., n. sp. Eleven new species are described: three cystoporates Altshedata hispanica n. sp., A. gracilis n. sp. and Fistulipora arauzensis n. sp.; four trepostomes: Neotrematopora tenuis n. sp., Leioclema arauzensis n. sp., Eridotrypella validaeformis n. sp. and Leptotrypella armata n. sp.; two rhabdomesine cryptostomes Orthopora spinosa n. sp. and Vidronovella elegantula n. sp.; and two fenestrates Rectifenestella exiliformis n. sp. and Tectulipora tuberculata n. sp. Two species were identified at genus and family level respectively: Eridopora sp. and Rhomboporidae sp. indet. Two identified species show palaeobiogeographic relations to the Lower Devonian of Altai, Mongolia, and Tajikistan respectively: Leioclema multiacanthoporum Astrova in Astrova & Yaroshinskay...