Haeckel
Cephalis cap-shaped, with 2 stout, 3-bladed horns. Thorax pyramidal (proximally) to cylindrical (distally), with 3 conspicuous wings. One or two cylindrical post-thoracic segments. Thorax and subsequent joints with small, circular, regularly arranged pores. Although this species has traditionally been ascribed to the Pterocorythidae, it’ s cephalis does not seem to be divided into lobes, and is therefore probably a theoperid.
Ref.: Haeckel (1887), Benson (1966).