Abstract
The basal termite Mastotermes darwiniensis produces an egg mass, the nature of which is controversial. The debate centres on whether it is homologous with the oothecae of mantids and cockroaches and, if so, whether its simple structure is plesiomorphic or apomorphic within the Dictyoptera. To help resolve these issues we observed primary reproductives of M. darwiniensis during oviposition and examined the morphology of the reproductive product. Oviposition is cockroach-like in that the egg mass is assembled within the vestibulum and the eggs are issued externally in pairs. The reproductive product is an ootheca of the blattarian type. A distinct, tanned outer covering is stretched over the two parallel rows of eggs. No keel is present and no calcium oxalate crystals were apparent in the outer covering. We cannot rule out the possibility that the simple structure of the ootheca is plesiomorphic within Dictyoptera. However, based on (i) apomorphies shared by Mastotermes and Blattaria, and (ii) the life habits of Isoptera, a secondary reduction is the more plausible explanation.
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Selected References
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- Bandi C., Sironi M., Damiani G., Magrassi L., Nalepa C. A., Laudani U., Sacchi L. The establishment of intracellular symbiosis in an ancestor of cockroaches and termites. Proc Biol Sci. 1995 Mar 22;259(1356):293–299. doi: 10.1098/rspb.1995.0043. [DOI] [PubMed] [Google Scholar]
- Bandi C., Sironi M., Nalepa C. A., Corona S., Sacchi L. Phylogenetically distant intracellular symbionts in termites. Parassitologia. 1997 Mar;39(1):71–75. [PubMed] [Google Scholar]
- Kenchington W., Flower N. E. Studies on insect fibrous proteins: the structural protein of the ootheca in the praying mantis, Sphodromatis centralis Rehn. J Microsc. 1969;89(2):263–281. doi: 10.1111/j.1365-2818.1969.tb00673.x. [DOI] [PubMed] [Google Scholar]
- Roth L. M. Control of oötheca formation and oviposition in Blattaria. J Insect Physiol. 1974 May;20(5):821–844. doi: 10.1016/0022-1910(74)90173-5. [DOI] [PubMed] [Google Scholar]