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Sternal glands in Strumigenys ants.

Chu Wang1, Fu-Ya Chung2, Chung-Chi Lin2

  • 1College of Forestry, Northwest A&F University, Yangling, 712100, Shaanxi, China; KU Leuven, Zoological Institute, Naamsestraat 59, Box 2466, 3000, Leuven, Belgium.

Arthropod Structure & Development
|March 27, 2025
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Summary

Researchers discovered two new sternal glands in Strumigenys ants, potentially aiding sting function. These glands, unique to this ant genus, show varied development across species.

Keywords:
Exocrine glandsHistologyMorphology

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Area of Science:

  • Entomology
  • Insect anatomy
  • Glandular systems

Background:

  • Strumigenys ants possess a highly developed exocrine system with 10 unique glands.
  • Previous research has established the complexity of Strumigenys ant glandular anatomy.

Purpose of the Study:

  • To survey and characterize newly discovered sternal glands in Strumigenys ants.
  • To investigate the morphology and potential function of these novel glands in relation to sting anatomy and behavior.

Main Methods:

  • Microscopic examination of sternal glands in 18 Strumigenys species (workers and queens).
  • Analysis of gland cell structure, including epithelial cell morphology, junctions, and associated cuticular features.
  • Comparative analysis of gland development across different species and its potential correlation with ecological roles.

Main Results:

  • Two novel sternal glands were identified in Strumigenys workers and queens, located on the 6th and 7th sternites.
  • These epithelial glands feature specialized cellular structures (interdigitations, smooth endoplasmic reticulum, microvilli) and are situated near the sting base.
  • Gland development varied, with the most pronounced glands in the social parasite Strumigenys mutica and rudimentary/absent glands in Strumigenys sauteri, potentially linked to sting-independent prey capture.

Conclusions:

  • The newly discovered sternal glands in Strumigenys ants are anatomically distinct and likely serve a function related to the sting mechanism.
  • The observed variations in gland development suggest functional adaptations within the genus, possibly related to feeding strategies or social parasitism.
  • The role of these glands in pheromone production or trail following can be excluded due to the genus's lack of trail-following behavior.