Jurassic Solnhofen Crinoid IF-M-Soln-16-002Pterocoma formosa Solnhofen Limestone Upper Jurassic (Tithonian) Eichstatt, Germany This is a good example of the free swimming crinoid Pterocoma. It is a feather star whose 10 slender arms can reach lengths up to 10 cm. Their delicate structure gives the animal a graceful appearance. Two species are found in the Solnhofen deposits, but it is debatable whether or not both are valid. This genus was formerly known as Antedon. The Solnhofen Plattenkalk,