Allometric studies on Basirolaimus indicus and Hirschmanniella oryzae (Nematoda: Tylenchida) Aliullah M. I. S. W.* Section of Nematology, Department of Zoology, Aligarh Muslim University, Aligarh-202001, India. * Present address: Section of Nematology, Division of Entomology, SKUAST Campus, Srinagar 191121. Abstract Lengths of procorpus, median oesophageal bulb, isthmus, end lobe total oesophagus, position of vulva from anterior end, length of spicule and length of tail and total body length (standard parameter) sets indicated presence of allometric growth with the correlation between a variate and standard parameter being positive in some and negative in others. The negative correlation coefficient showed increase in one parameter with a corresponding decrease or significant retardation or even no growth in the other. The variates, studied here, were negatively or positively correlated with the body length though, none of them was significant at P = 0.001 and therefore, can be said to be having disproportionate growth vis-a-vis the growth of the standard parameter. The values of heterogonic coefficient revealed that oesophageal length, position of vulva, spicule length and the tail length of males of B. indicus as well as H. oryzae exhibited noticeable heterogony. Top Key words Allometry, Basirolaimus indicus, Hirschmanniella oryzae, heterogonic coefficient. Top |