Paratetilla arcifera. Holotype USNM 21278, Malapascua Island, Cebu, Philippines A preserved specimen showing large porocalices B Labels of holotype C skeleton, showing calthrops and radial bundles D skeleton, showing oxeas, calthrops, and anatriaenes E oxea, end detail F-I different calthrop shapes and sizes J anatriaene K, L protriaene, different types M thin microxea, detail N thin microxea, full length O sigmaspires. Scale bars: 1 cm (A); 500 μm (C, D); 100 μm (E); 50 μm (F–I, N); 20 μm (J); 40 μm (K, L); 5 μm (M, O).