Morphological caste and sex differences in the Taiwanese stingless bee Trigona ventralis hoozana (Hymenoptera: Apidae)
Article first published online: 27 SEP 2004
Volume 7, Issue 3, pages 263–269, September 2004
How to Cite
SUNG, I.-H., YAMANE, S., HO, K.-K., WU, W.-J. and CHEN, Y.-W. (2004), Morphological caste and sex differences in the Taiwanese stingless bee Trigona ventralis hoozana (Hymenoptera: Apidae). Entomological Science, 7: 263–269. doi: 10.1111/j.1479-8298.2004.00072.x
- Issue published online: 27 SEP 2004
- Article first published online: 27 SEP 2004
- Received 5 September 2003; accepted 29 January 2004.
To examine morphological differences among queens, workers and males, 14 external body characters were measured in two colonies of the Taiwanese stingless bee Trigona ventralis hoozana. Queens were largest in all of the body parts measured except eye width and mesoscutum length, and values for most variables in queens did not overlap with those of workers and males. In contrast, the worker : male size ratios for 11 variables were close to 1.0, showing that overall body size and shape of workers resembled that of males rather than of queens. Males had the largest eyes and their mesoscutum length was comparable to that of queens. ancova between 14 morphometric variables and mesoscutum width chosen as standard body size showed that allometric growth in most variables was not linear. Plotting of some variables on mesoscutum width showed that queens had a proportionally wider first metasomal tergum and longer antennal scape, but a proportionally narrower head and eye than workers and males. These tests suggest that the morphological caste differences in this species belong to a category of complete dimorphism.