Review of the genus _Narcissia_ Gray, 1840: from morphology to taxonomy

Since the taxonomic revision of the Ophidiasteridae by H.L. Clark (1921), in which 20 genera were recognized as valid, several new genera and species were included in this family, and the boundaries between some of them became largely arbitrary. This also applies to Narcissia Gray, 1840, whose morphology and taxonomy are still very poorly understood today. The main goals of this research are: review the taxonomy of the genus Narcissia, throughout its range of distribution, from morphological studies; redescribe and characterize, morphologically, N. trigonaria Sladen, 1889 str. s; characterize, morphologically, N. canariensis (d’Orbigny, 1839) and N. ahearnae Pawson, 2007, the two valid species most similar to N. trigonaria; review the validity of N. trigonaria var. helenae Mortensen, 1933; review the validity of the N. gracilis malpeloensis Downey, 1975.