Metalasius myrmidon

Metalasius myrmidon
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Lasiini
Genus: Metalasius
Species: M. myrmidon
Binomial name
Metalasius myrmidon
(Mei, 1998)

Lasius myrmidon casent0903666 p 1 high.jpg

Lasius myrmidon casent0903666 d 1 high.jpg

Specimen Labels


Definition (worker) (Boudinot et al., 2022).

  1. With character states of Metalasius.
  2. Dorsal mandibular groove absent (see Boudinot et al. (2022), Note 1).
  3. Ventromedial base of mandible without trough or impression (see Boudinot et al. (2022), Note 2).
  4. Maxillary palps short, exceeding hypostomal margin but not reaching postgenal bridge midlength.
  5. Maxillary palpomere 3 longest, 4 shorter but as long as 5 and 6 together (see Boudinot et al. (2022), Note 3).
  6. Clypeus, in lateral view, convex and weakly bulging anteriorly (see Boudinot et al. (2022), Note 3).
  7. Anterior tentorial pit situated lateral to midlength of the epistomal suture.
  8. Lateral hypostomal carina absent (see Boudinot et al. (2022), Note 4).
  9. Compound eyes absent, reduced or vestigial, with at most 9 ommatidia (see Boudinot et al. (2022), Note 5).
  10. Propodeal spiracle situated distinctly in lower half of propodeum (see Boudinot et al. (2022), Note 6).
  11. Legs almost entirely devoid of standing setae (see Boudinot et al. (2022), Note 3).
  12. Petiolar node weakly inclined anteriorly, node well-developed, squamiform (see Boudinot et al. (2022), Note 7).

Metalasius myrmidon is uniquely identified among the Lasiini by:

  • absence of the dorsal mandibular groove and lateral hypostomal carina
  • short and broad third antennomere
  • mid-set compound eyes (when present), which are reduced to at most 9 ommatidia
  • near complete absence of standing setae on the head.

Note that high magnification may be required to evaluate the lateral hypostoma.


Latitudinal Distribution Pattern

Latitudinal Range: 39.94444444° to 38°.

Tropical South

Distribution based on Regional Taxon Lists

Palaearctic Region: Greece (type locality).

Distribution based on AntMaps

Distribution based on AntWeb specimens

Check data from AntWeb



Images from AntWeb

Worker. Specimen code casent0906115. Photographer Estella Ortega, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.


The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • myrmidon. Lasius myrmidon Mei, 1998: 177, figs. 1-11 (w.) GREECE.
    • Combination in Metalasius: Boudinot et al., 2022: 140.



References based on Global Ant Biodiversity Informatics

  • Borowiec L. 2014. Catalogue of ants of Europe, the Mediterranean Basin and adjacent regions (Hymenoptera: Formicidae). Genus (Wroclaw) 25(1-2): 1-340.
  • Borowiec L., and S. Salata. 2012. Ants of Greece - Checklist, comments and new faunistic data (Hymenoptera: Formicidae). Genus 23(4): 461-563.
  • Borowiec L., and S. Salata. 2017. Ants of the Peloponnese, Greece (Hymenoptera: Formicidae). Polish Journal of Entomology 86: 193-236.
  • Czechowski W., A. Radchenko, W. Czechowska and K. Vepsäläinen. 2012. The ants of Poland with reference to the myrmecofauna of Europe. Fauna Poloniae 4. Warsaw: Natura Optima Dux Foundation, 1-496 pp
  • Mei, M.. "Lasius (Cautolasius) myrmidon n. sp.: A new hypogaeic ant from Greece (Hymenoptera, Formicidae)." Bollettino della Societa Entomologica Italiana 130 (1998): 177-182.