HEAD AND CUTICULAR STRUCTURES OF SOME SPECIES IN THE FAMILY STEINERNEMATIDAE (NEMATODA) by ZDENEK MRÁ � EK and JAROSLAV WEISER Institute of Entomology, Department of Insect Pathology, Acad. Sci., Prague, Czechoslovakia and SVEN GERDIN University of Uppsala, Department of Entomology, Uppsala, Sweden Head and cuticular structures of the Steinernematidae: Steinernema kraussei, Neoaplectana glaseri, N. carpocapsae and N. bibionis were compared by scanning electron microscopy. In both genera and all species studied one ring of six labial papillae and one of four cephalic papillae were clearly visible, which shows that Steinernema and Neoaplectana cannot be separated on the number of head papillae alone. Details of the morphology of the lips, openings of secretory organs and of the sur- face of the cuticle are given. Invasive juveniles have only one ring of four cephalic papillae. Members of the Steinernematidae are all obligate parasites of insects adapted to the way of life by the alternation of giant and small females and per- manent association with specific strains of bacteria. The morphology and biochemistry of the associated bacteria do not help to differentiate the species or genera of the family. The first descriptions by Filipjev (1934) and others at a time when
Nematologica – Brill
Published: Jan 1, 1981
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