182 M. SHAMIM JAIRAJPURI & ATHER H. SIDDIQI 1) : Intersexuality in Tyleptus striatus. - - - . - Intersexuality is a rare phenomenon in most groups of Nematoda except the Mermithoidea where it is quite frequently observed (Steiner, 1923). In plant parasitic nematodes of the order Tylenchida Fig. 1. Occurrence of intersexuality in Tyleptus strialus. 183 it has been reported only thrice (Chitwood, 1949, Hirschmann & Sasser, 1955, and Triantaphyllou, 1960). Intersexes are usually females possessing rudiments of male secondary sexual characters. Only once a case of male intersexuality has been reported by Chitwood (1949) in Meloidogyne, javanica. Triantaphyllou (1960) found that intersex of M. javanica were derived from second stage female larvae through sex reversal. During a study of the genus Tyleptus Thorne, 1939, an intersex individual was found among a large population of males and females of 1'yleptu,r striatus Heyns, 1963, from around roots of Sac-c-harasna ravemzae (L.) Murray in Aligarh, India. This worm contains female reproductive organs as well as rudiments of male sexual characters like spicules, supplements and copulatory musculature. This appears to be the first record of intersexuality in the order Dorylaimida. Dimensions: Intersex: L = 0.65 mm; a = 30; b
Nematologica – Brill
Published: Jan 1, 1964
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