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 = 4; c = 50; V = 43. Normal females: L = 0.8-1.0 mm; a = 27-42; b = 3.6-4.5; c = 63-71; V = 33-36. Normal males: L = 0.8-0.9 mm; a = 33-35; b = 4.0-4.7; c = 40-53. As evident from the measurements, the intersex has a smaller body and more posteriorly located vulva than the normal females and the length of tail is more close to that of males. When compared with the normal males (Jairajpuri, 1964), the spicules of the intersex are short and delicate, the copulatory musculature is weak and the supplements are rudimentary, consisting of an adanal pair and one (or two?) ventromedian. CHITWOOD, B. G. (1949). 'Root-knot nematodes' - Part I. A revision of the genus Meloidogyne Goeldi, 1887. Proc. helm. Soc. W ash. 16, 90-104. HIRSCHMANN, H. & SASSER, J. N. (1955). On the occurrence of an intersexual form in Ditylenchus triformis n. sp., (Nematoda, Tylenchida) Proc. helm. Soc. Wash. 22, 115-123. JAIRAJPURI, M. S. (1964). Studies on Campydoridae and Leptonchidae (Nematoda: Dorylaimoidea) with description of Basirotyleptus basiri n. gen., n. sp., from India. Proc. helm. Soc. W ash. 31, 59-64. STEINER, G. (1923). Intesexes in nematodes. J. Hered. 14, 147-158. TRIANTAPHYLLOU, A. C. (1960). Sex determination in Meloidogyne incognita Chitwood, 1949 and intersexuality in M. javanica (Treub, 1885) Chitwood, 1949. Ann. Inst. Phytopath. Benaki, N.S., 3, 12-31. M. SHAMIM JAIRA JPURI 1) : Intra-uterine egg development in Aphelenchus avenae. Observations on the biology of Aphelenchu.r avenae Bastian, 1865 by Hechler (1962) show that the females always lay unsegmented eggs. Intra-uterine egg development was observed in only three or four females by Hechler (pers. comm.). Each female was an aged animal with wide body and flattened lateral fields. In a population of A. avenae collected from soil around roots of a pine tree, Pinus sp., from Simla (H.P.) India, it was found that almost all the gravid females contained eggs in various stages of development and many even with fully developed second stage juveniles. Intra-uterine egg development in this population seemed to be rule rather than exception. HECHLER, H. C. (1962). The development of Aphelenchus avenae Bastian, 1865 in fungus culture. Proc. helm. Soc. W ash. 29, 162-167. M. SHAMIM JAIRAJPURI 1): Criconemoides basili nom. nov. (syn. Criconemoides goodeyi Jairaj- puri, 1963 preoccupied). One of the two species of the genus Criconemoides Taylor, 1936 published by the author ( 1963) was named C. goodeyi. Recently de Guiran (1963) has also named a new species in the same genus as C. goodeyi. As the latter has date priority the specific name goodeyi is considered preoccupied and C. goodeyi jairajpuri, 1963 is now renamed C. basili nom. nov. after Dr. J. Basil Goodey. DE GUIRAN, G. (1963). Quatre espèces nouvelles du genre Criconemoides Taylor (Nematoda- Criconematidae) Rev. Path. Veg. Entom. Agric. 42, 1-11. JAIRAJPURI, M. S. (1963). Two new species of the genus Criconemoides Taylor, 1936 (Nematoda: Criconematidae) from North India. Nematologica 9, 381-385.
Nematologica – Brill
Published: Jan 1, 1964
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