MORPHOMETRICS ANALYSIS OF STINGLESS BEES Geniotrigona thoracica AND Wallacetrigona incisa (Apidae: Meliponini)

Agusman, Ariyan (2025) MORPHOMETRICS ANALYSIS OF STINGLESS BEES Geniotrigona thoracica AND Wallacetrigona incisa (Apidae: Meliponini). S1 thesis, Universita Andalas.

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Abstract

The stingless bee genus Geniotrigona (Apinae: Meliponini) was originally composed of three species: Geniotrigona lacteifasciata and G. thoracica, distributed in the Indo-Malaysian region, and G. incisa in the highlands of Sulawesi. Based on a newly identified character on the inner side of the tibia, Engel and Rasmussen reclassified G. incisa into a new genus, Wallacetrigona incisa. In this study, morphometric analysis was conducted on 32 characters measured from 10 specimens of each species using advanced microscopy techniques. The results revealed significant size differences, with G. thoracica exhibiting larger dimensions across multiple traits, including forewing length and body length. Statistical analysis showed that 96.975% of the measured characters differed significantly, while only 3.025% were similar, particularly in interocellar distance. These findings contribute to the taxonomic understanding of stingless bees in Indonesia by highlighting the distinct characteristics that separate Wallacetrigona incisa from its former placement in Geniotrigona. Moreover, the study underscores the role of ecological factors in shaping bee morphology and emphasizes the importance of morphometric research for biodiversity conservation. Keywords: Geniotrigona thoracica, Morphometrics, Stingless bees, Wallacetrigona insica

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