Camptostroma

Camptostroma roddyi is an extinct echinoderm from the Bonnia-Olenellus Zone of the Early Cambrian Kinzers Formation near York and Lancaster, Southeastern Pennsylvania.

"[3] In life, Camptostroma would have resembled a cupcake, with the mouth in the center of the upper surface, with ambulacra radiating from it in the 2-1-2 pattern common in early echinoderms.

[5] While initially considered to be a scyphozoan due to the fossil's medusoid shape, later investigation detected the presence of stereom plates with the calcitic cleavage pattern diagnostic of echinoderms.

[7] Camptostroma has since been placed in a class of basal echinoderms, the Edrioasteroids,[8] although some recent authors only describe it as "edrioasteroid-like".

[5] Recent research has found weak support for the recovery of Camptostroma as the sister group of the crinoids.

Camptostroma roddyi fossil on display at the Smithsonian's National Museum of Natural History.