1. Agassiz A (1881) Report of the echinoidea dredged by the H.M.S Challenger during the year 1873–76. Zool 3:1–321
2. Agassiz A (1888) XIX Characteristic deep-sea types-Echinoderms. Three cruises of the United States Coast and Geodetic Survey Steamer “Blake” in the Gulf of Mexico in the Caribbean Sea, and along the Atlantic Coast of the United States, from 1877 to 1880, vol 2. The Riverside Press, Cambrige, pp 84–127
3. Aguilar-Duarte C (2005) Caracterización taxonómica de la comunidad de equinodermos presentes en los Arrecifes Coralinos de las Islas de San Bernardo. Parque Nacional Natural Corales del Rosario y San Bernardo, Golfo de Morrosquillo, Bolívar, Colombia. Biología thesis, Univ Antioquia, Medellín, Colombia
4. Allain J (1976) Erizos de la Costa Norte de Colombia. Informe Museo del Mar 15:1–18
5. Allain J (1978) Déformations du test chez L’oursin Lytechinus variegatus (Lamarck) (Echinoidea) de la Baie de Carthagène. Caldasia 12:363–375