Volume 90, Issue 2
March 1981, pages 173-280
pp 173-186 March 1981
InsectsT. javanica Heteroptera Insecta, both male and female stridulate and the frequency is independent of the sex of the insect. An instrument is fabricated with a view to study the relative contributions of the components of the acoustic apparatus. These components are the striated wobbler, a comb-like structure and a folding membrane of the hind wing of the insect. It has been observed for the first time that the folding membrane is more effective in the process of stridulation. The comb acts only as an amplifier.
pp 187-193 March 1981
The paper discusses the taxonomic status ofOdontotermes distans Holmgren et Holmgren. The detailed structure of the nest is described and data on distribution and swarming behaviour of the species have been incorporated.
pp 195-202 March 1981
Taxonomic account of three species representing three different genera of the family Drosophilidae is presented. Two of them,Leucophenga rimbickana andNesiodrosophila pleurostriata are described as new, whileStegana shirozui Okada is recorded for the first time from India. A list of Indian species of Drosophilidae excluding the genusDrosophila is also given.
pp 203-208 March 1981
A new species of torrent toad,Ansonia rubigina is being described from a rocky stream in Silent Valley, South India. Although resembling closely the only other species, viz.,Ansonia ornata described from India, it is specifically distinct.
pp 209-223 March 1981
The nature of distribution, mode of attachment, incidence and intensity of infestation and the nature of damage by two host specific anthosomatid copepod parasites,Lemanthropus gibbosus Pillai andL. koenigii Stp. and Lutk. infesting fishesSaurida tumbil (Bloch) andParastromateus niger (Bloch) respectively, along the South-west coast of India are described. The results show that both these parasites are of serious concern to their hosts causing irreparable damage to the gills both by way of their mode of attachment and feeding activity. The blood circulation of the gills is severely curtailed and the infested gill filaments are completely put out of function.
pp 225-236 March 1981
The development of the larvae of the marine hermit crabClihanarius clibanarius (Herbst) reared in the laboratory (salinity 34‰±1‰ and temperature 28°C ±1°C) is reported. Four zoeal stages and a glaucothoe were observed during development. Characteristics of the larval stages are described and compared with other known species of this genus. The time taken for development from hatching to glaucothoe is given.
pp 237-251 March 1981
InAbedus ovatus both the stomodaeal and proctodaeal valves are found. In the mid-gut the cell nests are found in the folds of epithelium. The epithelium of the hind-gut is membranous. The absorbable production of digestion such as glycogen which is found mostly in the first mid-gut and the proteins and lipids are abundantly found in posterior mid-gut and the anterior part of the ileum.
pp 253-260 March 1981
Fecundity of Kumaun high altitude mahaseerTor putitora was studied by both gravimetric and volumetric count methods. The fecundity ranged from 7076 to 18525 in total length range from 33·90 to 51·70 cm. It was found that the fecundity has straight line relationships with total length, body weight, ovary length, ovary weight and ovary volume separately. These relationships are expressed by standard formulae separately for both gravimetric and volumetric counts of eggs. The number of eggs increased more with per centimeter of the total length than per gram body weight of the fish. The fecundity increased with higher year classes. It was also observed that the female fish mature after 3 years of age.
pp 261-280 March 1981
Specimens with growth checks in process of formation on both scales and opercles occur throughout the year. When a growth check is formed on the scale of a particular specimen, it does not necessarily mean that it is being formed simultaneously on the opercie of the same individual, orvice versa. A maximum of 8 and 6 growth checks in males and females respectively are observed on both scales and opercles. There is a positive correlation between total length and number of growth checks on both hard parts. Values of average length and observed number of growth checks show that there is no gradual decrease in the rate of growth. Scales and opercles show differences in the number of growth checks in many specimens. The first growth check is not formed during the same period of the year in ail individuals. There is no gradual decrease in the distance between successive growth checks. Considerable numbers of adult females in all stages of maturity show growth checks in the process of formation revealing that the spawning stress or reproductive strain is not the only factor leading to growth check formation.