Temnothorax rugosus

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Temnothorax rugosus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Temnothorax
Species group: salvini
Species subgroup: rugosus
Species: T. rugosus
Binomial name
Temnothorax rugosus
(Mackay, W.P., 2000)

The type series was collected in a trap baited with Vienna sausage, placed in oak trees, about 2-meter height. The habitat was a very steep, south-facing slope of a mountain, covered with oak trees. The specimens were collected within 20 meters distant from one another. (Mackay 2000)

Identification

Mackay (2000) - A member of the Temnothorax nitens species complex. This is a medium sized, light brown species with a 12-segmented antenna, in which the head and mesosoma are coarsely rugose. It is one of the few species in the subgenus which has a very lightly sculptured gaster, which is not always obvious. The hind femur is somewhat incrassate. The petiole is narrow as seen from above, with a laterally "pinched" node, the postpetiole has fine, longitudinal striae.

This species may be related to Temnothorax silvestrii, with similar sculpturing on the gaster (note: the sculpturing is very fine and difficult to see in some specimens), and a thickened hind femur, but is easily distinguished as the apex of the petiolar node is rather sharp, not broad and blunt as in Temnothorax silvestrii. The top of the mesosoma of both species is rugose. The shape of the petiole (forming an acute peak where anterior face meets top of node) easily separates it. It is quite different from all of the other species with sculptured gasters. It is very distinct from Temnothorax maryanae (=Temnothorax nevadensis), and can be easily distinguished as the side of the pronotum is rugose, whereas the side of the pronotum of Temnothorax maryanae is punctate.

The sculpture on the gaster of the holotype is very obvious, that on the 2 paratypes is less obvious. The latter specimens could key to Temnothorax tricarinatus. Temnothorax rugosus differs in that the sculpture is much coarser, with the rugae on the head and dorsum of the mesosoma very well developed. The petiole is much narrower as seen from above, and pinched. The sculpture of the postpetiole is more coarsely sculptured, with costulae at least on the sides. The clypeus has several poorly developed carinae, not the 3 well developed carinae as in Temnothorax tricarinatus. Temnothorax rugosus could also be confused with Temnothorax texanus, but can be separated as the rugae on the dorsum of the postpetiole of Temnothorax texanus are transverse, whereas the rugae in the same position of Temnothorax rugosus are longitudinal.

Keys including this Species

Distribution

Mexico: Nuevo Leon.


Latitudinal Distribution Pattern

Latitudinal Range: 23.96166667° to 23.96166667°.

 
North
Temperate
North
Subtropical
Tropical South
Subtropical
South
Temperate

Distribution based on Regional Taxon Lists

Nearctic Region: United States.
Neotropical Region: Mexico (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Habitat

Oak forest (type collections).

Abundance

Only known from types.

Caste

Known only from the worker caste.

Nomenclature

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

  • rugosus. Leptothorax (Myrafant) rugosus Mackay, W.P., 2000: 399, figs. 18, 160 (w.) MEXICO. Combination in Temnothorax: Bolton, 2003: 272.

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

Description

Worker

Mandibles with 5 well defined teeth; anterior border of clypeus convex, clypeus with well developed medial carina and several lateral carinae; vertex concave; mesosoma with none of the sutures breaking surface, although area of mesopropodeal suture depressed; propodeal angles well developed, acute, nearly formed into spines, about half as long as distance between bases; petiole with dull spine on peduncle, directed anteriorly, anterior and posterior faces nearly straight, meeting at a distinct angle, petiolar node thus acute in profile; femora of all legs, especially posterior leg, thickened. Erect hairs scattered over surface, coarse and blunt, maximum length 0.05mm, absent from antennae and legs, which have decumbent hairs. Sculpture very rough, consisting of rugae on all surfaces except gaster, intrarugal spaces heavily punctate, gaster with very fine punctation, nearly smooth and shining.

Color: light brownish-yellow, gaster and top of head slightly darker.

Worker measurement (mm): HL 0.67-0.70, HVV 0.58-0.59, SL 0.49-0.50, EL 0.16-0.17, WL 0.82-0.83, PW 0.14-0.15, PL 0.19-0.23, PPW 0.27-0.28, PPL 0.18-0.19. Indices: CI 84-87, SI 71-73, PI 65-74, PPI 147-150.

Type Material

MEXICO, Nuevo Leon; EI Salto (Zaragosa), 10-vi-1988, 1415 meters, W. Mackay #11012-8 and #11012-10. Holotype worker (Museum of Comparative Zoology), and two paratype workers (William and Emma Mackay Collection, Universidad Nacional Autonoma de Mexico).

Etymology

Morphological. "Name based on the rugose head and mesosoma."

References

References based on Global Ant Biodiversity Informatics

  • Dattilo W. et al. 2019. MEXICO ANTS: incidence and abundance along the Nearctic-Neotropical interface. Ecology https://doi.org/10.1002/ecy.2944
  • Vásquez-Bolaños M. 2011. Lista de especies de hormigas (Hymenoptera: Formicidae) para México. Dugesiana 18: 95-133