Leptanilloides improvisa

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Leptanilloides improvisa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dorylinae
Genus: Leptanilloides
Species: L. improvisa
Binomial name
Leptanilloides improvisa
Brandão, Diniz, Agosti & Delabie, 1999

A brief habitat remark - shrub litter - from the type label is all that is known about the biology of Leptanilloides improvisa.


A member of the Leptanilloides biconstricta species-group.

Keys including this Species


Distribution based on Regional Taxon Lists

Neotropical Region: Ecuador (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb




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

  • improvisa. Leptanilloides improvisa Brandão, Diniz, Agosti & Delabie, 1999: 28, figs. 3, 4, 16, 22 (w.) ECUADOR.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.



Holotype (MCZ) (in mm): HL 0.50, HW 0.38, SL 0.26, WL 0.68, CI 76, SI 68, SRI.

The postpetiole nearly as high dorsoventrally than the first fourth abdominal segment. The coarser head sculpture and mandibular teeth, better developed in relation to the other species in the genus, distinguishes L. improvisa from all other Leptanilloides.

Other relevant characters include: head with convex sides in full-face view, head sculpture with up to 20 deep foveolae covering a straight transverse line at head midlength; inner margins of the frontal carinae are separated from each other; flange over the metapleural gland opening rounded, and it does not surpass the lateral propodeum profile.

Type Material

Holotype worker deposited at Museum of Comparative Zoology. Ecuador, Volca´n Cotopaxi, NNE Latacunga, Paramo Moss, shrub litter, 3350 m, 23.vi.1975, B-305, leg. S. & J. Peck.


Improvisa, a noun in apposition, meaning unexpected in Latin, referring to the fact that this manuscript was almost ready when we found this unique specimen among other samples of Leptanilloides.


Brandão, C. R. F.; Diniz, J. L. M.; Agosti, D.; Delabie, J. H. 1999. Revision of the Neotropical ant subfamily Leptanilloidinae. Systematic Entomology 24:17-36. (page 28, figs. 3,4, 16, 22 worker described)

References based on Global Ant Biodiversity Informatics

  • Brandão, C.R.F., J.L.M. Diniz, D. Agosti and J.H. Delabie. 1999. Revision of the Neotropical ant subfamily Leptanilloidinae. Systematic Entomology, 24: 17-36.
  • Delsinne T., G. Sonet, and D. A. Donoso. 2015. Two new species of Leptanilloides Mann, 1823 (Formicidae: Dorylinae) from the Andes of southern Ecuador. European Journal of Taxonomy 143: 1–35.
  • Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.