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- Title
Apoptotic wing degeneration and formation of an altruism-regulating glandular appendage (gemma) in the ponerine antDiacammasp. from Japan (Hymenoptera, Formicidae, Ponerinae).
- Authors
Gotoh, A.; Sameshima, S.; Tsuji, K.; Matsumoto, T.; Miura, T.
- Abstract
We here show an example of morphological novelties, which have evolved from insect wings into the specific structures controlling social behaviour in an ant species. Most ant colonies consist of winged queen(s) and wingless workers. In the queenless ponerine antDiacammasp. from Japan, however, all female workers have a pair of small thoracic appendages, called “gemmae”, which are homologous to the forewings and acts as an organ regulating altruism expression. Most workers, whose gemmae are clipped off by other colony members, become nonreproductive helpers, while only a single individual with complete gemmae becomes functionally reproductive. We examined histologically the development of gemmae, and compared it with that of functional wings in males. Female larvae had well-developed wing discs for both fore- and hindwings. At pupation, however, the wing discs started to evaginate and later degenerate. The hindwing discs completely degenerated, while the degeneration of forewing discs was incomplete, leading to the formation of gemmae. The degeneration process involved apoptotic cell death as confirmed by TUNEL assay. In addition, glandular cells differentiated from the epithelial cells of the forewing buds after completion of pupation. The mechanism of developmental transition from wing to gemma can be regarded as an evolutionary gain of new function, which can be seen in insect appendages and vertebrate limbs.
- Subjects
HYMENOPTERA; APOPTOSIS; ANIMAL morphology; DEVELOPMENTAL biology; VERTEBRATES; EXTREMITIES (Anatomy)
- Publication
Development Genes & Evolution, 2005, Vol 215, Issue 2, p69
- ISSN
0949-944X
- Publication type
Article
- DOI
10.1007/s00427-004-0456-7