Octostruma triquetrilabrum Longino

Longino, John T, 2013, A revision of the ant genus Octostruma Forel 1912 (Hymenoptera, Formicidae), Zootaxa 3699, pp. 1-61 : 53-54

Octostruma triquetrilabrum Longino , sp. nov.

(Figs 1A, 3A, 5K, 39, 43)

Type material. Holotype worker: COSTA RICA, Puntarenas: Est. Biol. Los Llanos, near Santa Elena, 10.30487, - 84.83735, ± 100 m, 1150 m, 28 Feb 2004, moist forest, ex sifted leaf litter (J. Longino#5249-s) [INBC, JTLC000004551]. Paratype workers: same data [JTLC, JTLC000004543]; same data except Alajuela: Casa Eladio, Rio Penas Blancas, 10.31667, -84.71667, ± 2 km, 800 m, 10 May 1989, wet forest, ex sifted leaf litter on ground (J. Longino#2529-s) [CAS, INBIOCRI001281407]; 23 May 1990 (J. Longino#2701-s) [USNM, CASENT0627377; MCZC, CASENT0627378; UCDC, INBIOCRI001282521; MZSP, INBIOCRI001282522; CAS, INBIOCRI001282523].

Geographic range. Costa Rica, Panama.

Diagnosis. With the characters of O. wheeleri and O. triangulabrum . Differing from O. wheeleri in the presence of 8-10 spatulate setae on face (6 on O. wheeleri ) and shallow reticulate rugulose sculpture on face and dorsal pronotum (nearly smooth on O. wheeleri ). Differing from O. triangulabrum in the absence of a pair of spatulate setae on the mesonotum (present in O. triangulabrum ); first gastral sternite more uniformly punctate.

Description. Worker. HW 0.74-0.80, HL 0.68-0.72, WL 0.84-0.88, CI 109-111 (n=2). Matching in almost every respect the description for O. triangulabrum , except the differences outlined in the Diagnosis and key.

The queen is unknown.

Biology. Octostruma triquetrilabrum is known from two sites near Monteverde in the Cordillera de Tilaran, and one site in the mountains of western Panama. One Monteverde site is very wet, old-growth montane forest at 800 m on the Atlantic slope, and the other Monteverde site is a small patch of seasonal moist forest at 1150 m, just below the cloud forest on the Pacific slope. All specimens are from Winkler samples of sifted leaf litter.

Etymology. The name refers to the triangular labrum that is not bilobed at the apex. It is a noun in apposition and thus invariant.