Studies in cephaline gregarines (Protozoa: Sporozoa) from insects: life history of Retractocephalus raphidopalpae Haldar and Chakraborty, 1976 and four new species of the genus Retractocephalus. Archiv fuer Protistenkunde, 125(1-4) 1982: 41-62. 48 [Zoological Record Volume 138]