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Bajcaridris theryi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Formicini
Genus: Bajcaridris
Agosti, 1994
Type species
Formica (Proformica) theryi, now Bajcaridris theryi
3 species
(Species Checklist, Species by Country)

Bajcaridris theryi casent0101950 profile 1.jpg

Bajcaridris theryi

Bajcaridris theryi casent0101950 dorsal 1.jpg

Specimen Label

Evolutionary Relationships

  (2 genera)

  (11 genera)

  (9 genera)


  (15 species)

  (284 species)

  (1 species)

  (3 species)

  (30 species)

  (118 species)

  (4 species)

Gesomyrmex, Oecophylla

  (9 genera)

Gigantiops, Myrmoteras, Santschiella

  (8 genera)

Based on Ward et al. 2016.

Agosti (1994) - Bajcaridris includes the three species Bajcaridris kraussii, Bajcaridris menozzii and Bajcaridris theryi. With the exception of theryi, which has recently been rediscovered (Espadaler & Cagniant, 1987), all the three species have rarely been collected since they were described (kraussii: Forel, 1895, 1902, Emery, 1899; menozzii: Santschi, 1923; theryi: Santschi, 1936). Their habitats are either in the oueds of the northern Sahara in Algeria (kraussii and menozzii) or in the meadows of the mountains of the Atlas in Morocco, where they are among the dominant ant species, building nests in the earth either below stones or with a distinct crater-shaped nest entrance (Espadaler & Cagniant, 1987).


Agosti (1994) - The workers differ by the combination of the following three characters from all the other ants of the tribe: dentition of the mandible with a small third tooth, clavate hairs and the first funicular segment which is longer than the two subsequent. The males are unique in the following combination of characters: the same size as the workers, a compressed head with distinct, large ocelli forming a socket, a unique subgenital plate with an unpaired median, caudal process, and a long pointed sagitta.

AntWeb icon 02.png See images of species within this genus



Distribution and Richness based on AntMaps


Life History Traits

  • Mean colony size: ? (Greer et al., 2021)
  • Compound colony type: not parasitic (Greer et al., 2021)
  • Nest site: hypogaeic (Greer et al., 2021)
  • Diet class: ? (Greer et al., 2021)
  • Foraging stratum: ? (Greer et al., 2021)



Worker Morphology

• Antennal segment count: 12 • Antennal club: absent • Palp formula: 6,4 • Spur formula: 1 simple, 1 simple • Eyes: >100 ommatidia • Scrobes: absent • Pronotal Spines: absent • Mesonotal Spines: absent • Propodeal Spines: absent • Petiolar Spines: absent • Caste: none or weak • Sting: absent • Metaplural Gland: present • Cocoon: present

These characters are collated in the Worker Morphology table.


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

  • BAJCARIDRIS [Formicinae: Formicini]
    • Bajcaridris Agosti, 1994a: 99. Type-species: Formica (Proformica) theryi, by original designation.
    • [Bajcaridris Agosti, 1991: 295. Nomen nudum.]


Based on Agosti (1994):


Formicini ants with the following combination of characters:

  1. Small (TL <1.4mm), shining ants.
  2. Mandible with 5 teeth, declining in size from apical to basal with the exception of the third tooth, which is distinctly smaller than the subsequent and the precedent.
  3. First funiculus segment longer than the two subsequent together.
  4. Frontal carina reduced to a bulge.
  5. Propodeal spiracle minute, ellipsoid.


Inferred ergatogyne, because X. Espadaler and H. Cagniant did not find a queen in nests they dug out (Espadaler & Cagniant, 1987).


Formicini ants with the following modifications:

  1. Small males, of the same size as workers (TL < 1.4 mm), shining.
  2. Head compressed with a turban-like ocellar socket.
  3. Mandible short, subparallel.
  4. Terminal branches of the wing venation reduced.
  5. Subgenital plate with a median apical, truncated appendix with two apical claws.
  6. Stipes without median appendices.
  7. Volsella rotated about 90° caudally; digitus horizontal, the tip of the cuspis in situ as long as the stipes, dorsoventrally oriented.
  8. Sagitta with a ventrally elongated apex, in situ as long as stipes; ventral side with few distinct teeth, the lateral plate of the two-folded sagitta protruding almost as far as the median plate with the teeth.
  9. Few scattered long, erect hairs all over the body.
  10. Dense pilosity on the dorsal surface of the wings.