Myopias crawleyi

In Thailand, specimens of this species were collected from rotten wood in dry evergreen forest, elevation about 500–800 m. (Jaitrong, Tasen & Guénard, 2018)

Identification
Jaitrong, Tasen & Guénard (2018) - Body 5.70–5.85 mm in total length (medium size). Masticatory margin of mandibles with five teeth and/or denticles; basal margin with an ill-defined protuberance; median clypeal lobe slightly broader than long, subtriangular, widened forward, its anterior margin weakly concave; eyes relatively large with 10-11 ommatidia along the longest axis; antennal scape relatively long, almost reaching posterior margin of head; in profile, anteroventral corner of head with bluntly angled process; petiole subrectangular, slightly shorter than high; subpetiolar process well developed, with concave ventral outline, with a downward pointed triangular denticle at anteroventral corner, and with a small posteriorly pointed denticle at posteroventral corner. Dorsum of head with fine dense punctures, with area between punctures smooth and shiny; dorsum of mesosoma and petiole with sparse punctures; mesopleuron, lateral face and declivity of propodeum smooth and shiny; metasoma segment III dense foveae; metasoma segment IV with sparse small punctures, areas between punctures smooth and shiny. Body entirely reddish brown to dark brown.

Thailand Myopias species: Myopias crawleyi is similar to Myopias sakaeratensis in having reddish brown to dark brown body colour; anteroventral corner of head with bluntly angled process; anterior margin of median clypeal lobe weakly concave and other general appearance. However, M. crawleyi is easily separated from M. sakaeratensis by the following characteristics: mesopleron and lateral face of propodeum smooth and shiny (sculptured in M. sakaeratensis); propodeal declivity smooth and shiny (reticulate in M. sakaeratensis); posterior ¾ of subpetiolar process triangular, its ventral outline almost straight (posterior ¾ of subpetiolar process rectangular, its ventral outline weakly convex in M. sakaeratensis); slightly smaller size (HW 0.96–0.99 mm in M. crawleyi; HW 1.19–1.29 mm in M. sakaeratensis).

Distribution
Tak, Kanchanaburi and Nakhon Si Thammarat Provinces, Thailand; Sumatra, Indonesia.

Distribution based on Regional Taxon Lists
Indo-Australian Region: Indonesia. Oriental Region: Thailand.

Nomenclature

 * . Trapeziopelta crawleyi Donisthorpe, 1941k: 237.
 * Replacement name for Trapeziopelta nitida Crawley, 1924: 384. [Junior secondary homonym of Ponera nitida Smith, F. 1861b: 45.]
 * Combination in Myopias: Bolton, 1995b: 269.
 * Status as species: Chapman & Capco, 1951: 75; Bolton, 1995b: 269; Probst, Guénard & Boudinot, 2015: 205 (in key); Jaitrong, Tasen & Guénard, 2018: 156 (redescription).
 * Distribution: Indonesia (Sumatra), Thailand.

Worker
Jaitrong, Tasen & Guénard (2018) - Non-type workers (n = 7): TL 5.70–5.85, HL 1.06–1.16, HW 0.96–0.99, SL 0.86–0.92, ED 0.13–0.17, ML 0.89–0.92, PW 0.76–0.79, MSL 1.65–1.68, PL 0.56–0.59, PH 0.69–0.73, DPW 0.56–0.59, CI 86– 91, SI 90–93, OI 13–17, MI 79–85, LPI 117–129, DPI 94–103.

Type Material
Jaitrong, Tasen & Guénard (2018) - Holotype worker, INDONESIA, Sumatra, Fort de Kock, October 1922, 920M, E. Jacobson leg. (, syntype image examined).

References based on Global Ant Biodiversity Informatics

 * Chapman, J. W., and Capco, S. R. 1951. Check list of the ants (Hymenoptera: Formicidae) of Asia. Monogr. Inst. Sci. Technol. Manila 1: 1-327
 * Crawley W.C. 1924. Ants from Sumatra, with biological notes by Edward Jacobson. Annals and Magazine of Natural History (9)13: 380-409
 * Jaitrong W., W. Tasen, and B. Guénard. 2018. The ant genus Myopias Roger, 1861 (Hymenoptera: Formicidae: Ponerinae) in Thailand, with descriptions of three new species. Zootaxa 4526: 151–174.