Abstract
1. Karyotypes ofTherapon jarbua andT. puta have been studied from the gill epithelium after colchicine injections.
2. The diploid chromosome number in both the sexes of the two species is 48, all the elements being metacentrics.
3. The chromosomes measured from 1·76 to 4·0 µ inT. puta and from 1·76 to 3·4 µ inT. jarbua.
4. The karyotypes of the two species differ in two respects:—
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(i)
The fourteenth pair inT. puta has submedian centromeres while inT. jarbua it has median centromeres.
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(ii)
There are 3 smaller pairs injarbua whereas only one pair is smaller inputa.
5. The inclusion of both the species under the same genusTherapon seems justified by the cytological findings.
6. It has been suggested from the available information that the families Serranidae and Sillaginidae may be closer to the family Theraponidae although this should await confirmation from further studies.
7. No heteromorphic pair or pairs of chromosomes have been observed in the karyotypes of either sex in both the species.
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Communicated by Prof. R. V. Seshaiya,f.a.sc.
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Subrahmanyam, K., Natarajan, R. A study on the somatic chromosomes ofTherapon cuvier (Teleostei: Perciformes). Proc. Indian Acad. Sci. 72, 288–294 (1970). https://doi.org/10.1007/BF03052124
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DOI: https://doi.org/10.1007/BF03052124