British Lower Jurassic Crinoids

Abstract

The crinoids of the British Lias are described, and intact material of most species is known. The fauna is dominated by the Isocrinida, with 20 species (3 new) in 7 genera (2 new); some isolated brachial plates attributed to the Paracomatulidae are described under open nomenclature. The Millericrinida are of restricted occurrence and diversity, with only 5 species (2 new) in 4 genera. A new late Triassic Seirocrinus (Isocrinida) species from the USSR is described, and other species not found in the British Lias are briefly discussed.