Hymedesmia armigeraHymedesmia armigera is a species of demosponge in the family Hymedesmiidae.DistributionThis species was described from Roundstone Bay, Ireland where it was collected by Rev. A.M Norman. It has not been reported since.DescriptionThis sponge was entangled in a piece of maerl. It has acanthostyles of variable length, 80-260 µm in length, all entirely spined. The skeleton spicules are fusiform tornotes or straight oxea, 210 µm in length and the chelae are 16-20 µm, with small alae and a long, thin, curved shaft.