Temnothorax goniops

Identification
Temnothorax goniops can be separated from all other species in the salvini clade by the following character combination: antennal scapes short, failing to reach the posterior margin of the head capsule by about the width of the antennal scape (SI 80–83); compound eyes small (OI 22–24); body very compact (WLI < 130); metanotal groove absent; erect setae present on propodeum; propodeum not strongly depressed; propodeal spines about as long as the propodeal declivity (PSI 33–36). directed posterodorsally, and straight; propodeal spines broadly approximated in dorsal view (SBI > 30); hind femora weakly to moderately incrassate (FI 182–252); petiolar node erect and subquadrate, not overhanging the caudal cylinder in profile view; petiolar node compact, not elongate (NI 113–148); petiolar node broader than caudal cylinder in dorsal view (PNWI 123–140); postpetiole moderately broad (150 < PWI < 220); head sculpture uniformly areolate; antennal scapes with short, decumbent pilosity; setae on head, mesosoma, waist segments and gaster erect, short, sparse and blunt (never long and tapering); integument yellow.

Similar species: Temnothorax aureus, Temnothorax aztecus, Temnothorax paraztecus, Temnothorax pilicornis, Temnothorax rugosus, Temnothorax subditivus (light form), Temnothorax terrigena, Temnothorax torrei, species of the annexus and goniops groups. Temnothorax goniops differs from T. aztecus and T. paraztecus by, among many other characters, its smaller size (WL < 0.7 mm vs. > 1 mm) and lack of long, tapering setae on head, mesosoma, legs, and gaster. Temnothorax goniops can be distinguished from T. pilicornis by the pilosity on the antennal scapes, which is decumbent in T. goniops, as opposed to subdecumbent in T. pilicornis. The pedunculate petiole with an erect subquadrate node will separate T. goniops from T. aztecus, T. paraztecus, and T. subditivus, which have squamiform petiolar nodes, T. aureus, which has a posteriorly leaning petiolar node, and T. rugosus, which has a cuneiform to subcuneiform petiolar node. Temnothorax goniops differs from T. torrei by the presence of four erect setae on the dorsum of the petiolar node, as opposed to two. Temnothorax goniops can be distinguished from T. terrigena by the relatively long propodeal spines, which are longer than the propodeal declivity (shorter than the declivity in T. terrigena). The members of the annexus group all have a medially emarginate anterior clypeal margin, which is entire and convex in ''T. goniops. Temnothorax goniops can be separated from other members of the goniops group by the yellow integument (bicolored in Temnothorax huehuetenangoi, and predominantly dark brown in Temnothorax ixili, Temnothorax achii, and Temnothorax xincai), continuous dorsal margin of the mesosoma (the propodeum is depressed in T. xincai), long propodeal spines (shorter than the propodeal declivity in T. ixili and T. achii), and the uniformly areolate dorsum of the head (smooth and shining in T. huehuetenangoi'').

Distribution
Appears to be distributed widely across Southern Mexico and the Yucatán peninsula.

Distribution based on Regional Taxon Lists
Neotropical Region: Mexico.

Nomenclature

 *  goniops. Leptothorax goniops Baroni Urbani, 1978b: 445, figs. 65, 110 (w.) MEXICO. Combination in Temnothorax: Bolton, 2003: 271.

Worker
Prebus (2021) - (n = 3): SL = 0.378–0.395 (0.384); FRS = 0.156–0.160 (0.158); CW = 0.497–0.524 (0.510); CWb = 0.453–0.488 (0.472); PoOC = 0.212–0.214 (0.213); CL = 0.520–0.562 (0.544); EL = 0.120–0.130 (0.126); EW = 0.089–0.093 (0.092); MD = 0.116–0.125 (0.121); WL = 0.558–0.613 (0.594); SPST = 0.185–0.222 (0.206); MPST = 0.196–0.202 (0.198); PEL = 0.263–0.275 (0.267); NOL = 0.137–0.148 (0.143); NOH = 0.097–0.121 (0.109); PEH = 0.190–0.204 (0.197); PPL = 0.139–0.180 (0.165); PPH = 0.161–0.189 (0.172); PW = 0.317–0.341 (0.331); SBPA = 0.147–0.161 (0.155); SPTI = 0.219–0.260 (0.234); PEW = 0.137–0.144 (0.141); PNW = 0.174–0.201 (0.185); PPW = 0.273–0.288 (0.280); HFL = 0.311–0.396 (0.357); HFWmax = 0.089–0.109 (0.101); HFWmin = 0.042–0.049 (0.045); CS = 0.713–0.769 (0.744); ES = 0.167–0.175 (0.172); SI = 80–83 (81); OI = 22–24 (23); CI = 87; WLI = 123–129 (126); SBI = 32–33 (33); PSI = 33–36 (35); PWI = 194–204 (199); PLI = 146–198 (165); NI = 113–148 (132); PNWI = 123–140 (132); NLI = 50–56 (54); FI = 182–252 (225).

Worker description: In full-face view, head subquadrate, longer than broad (CI 87). Mandibles densely, finely striate but shining and armed with five teeth: the apical-most well developed and acute, followed by a less developed preapical tooth and three equally developed smaller teeth. Anterior clypeal margin evenly convex medially. Antennal scapes short: when fully retracted, failing to reach the posterior margin of the head capsule by about the width of the antennal scape (SI 80–83). Antennae 12-segmented; antennal club of composed of three segments, with the apical-most segment nearly twice as long as the preceding two in combination. Frontal carinae moderately long, extending past the antennal toruli by about two times the maximum width of the antennal scape. Compound eyes moderately protruding past the lateral margins of the head capsule. Lateral margin of head weakly convex, nearly flat, forming a continuous arc from the mandibular insertions to the posterior margin of the head. Posterior head margin weakly emarginate, but predominantly flat and rounding evenly into the lateral margins.

In profile view, compound eyes ovular and moderately large (OI 22–24), with 9 ommatidia in longest row. Pronotal declivity indistinct, but junction of anterior and dorsal faces marked by a change in ground sculpture; neck and anterior face of pronotum forming a ~120° angle; anterior face and dorsal face forming a rounded ~130° angle. Mesosoma evenly convex from where it joins the pronotal declivity to the propodeal spines. Promesonotal suture extending from the posterior margin of the procoxal insertion only to the mesothoracic spiracle, which is moderately well developed. Metanotal groove visible as a disruption of the sculpture laterally from where it arises between the midand hind coxae to where it ends in the poorly developed metathoracic spiracle, which is nearly indistinguishable against the ground sculpture. Propodeal spiracle moderately well developed, directed posterolaterally, and separated from the propodeal declivity by about four spiracle diameters. Propodeal spines well developed and long (PSI 33–36), longer than the propodeal declivity, flared at the base, slightly upcurved at the apices, and acute. Propodeal declivity flat, with a lamina between the base of the propodeal spine and the propodeal lobe, forming a rounded ~100° angle with the base of the propodeal spines. Propodeal lobes rounded and weakly developed. Metapleural gland bulla small, extending from the metacoxal insertion halfway to the propodeal spiracle. Petiole moderately long (PLI 146–198), without tubercles anterodorsally. Subpetiolar process in the form of a small, acute tooth; ventral margin of petiole flat posterior to it. Petiolar peduncle moderately long: comprising about half the length of the petiole. Petiolar node robust and subquadrate: transition between peduncle and node marked by a rounded angle of ~130°, resulting in a concave anterior node face; anterior face forming a ~100° angle with the dorsal face, which is weakly convex; dorsal face rounding evenly into the short posterior face, which forms a ~90° angle with the caudal cylinder. Postpetiole flat anteriorly, rounding into the weakly convex dorsal face; weakly lobed ventrally.

In dorsal view, humeri weakly developed: evenly rounded and slightly wider than the rest of the mesosoma; mesothoracic spiracles weakly protruding past the lateral margins of the mesosoma, visible as slight angles where the pronotum meets the mesonotum. Metanotal groove absent: mesonotum and propodeum completely fused and lateral margins converging evenly to the bases of the propodeal spines. Propodeal spines broadly approximated basally and diverging apically, their apices separated from each other by about their length, the negative space between them “U” shaped. Petiolar peduncle with spiracles not protruding past the lateral margins. Petiolar node campaniform: evenly rounded anteriorly, and very weakly convex posteriorly, nearly flat. Node wider than the peduncle, and about one and a quarter times as wide as the caudal cylinder. Postpetiole moderately broad (PWI 194–204) and campaniform, articulating with most of the anterior margin of the gaster, leaving small, angulate margins on each side exposed. Anterior margin of the postpetiole weakly emarginate medially, and evenly rounds into the lateral margins, which diverge slightly to the angulate posterior corners; posterior margin flat. Metafemur weakly to moderately incrassate (FI 182–252).

Sculpture: median clypeal carina present, extending posteriorly nearly to the frontal triangle, and flanked on either side by two equally strong carinae. Lateral clypeal lobes with additional, weaker carinae; ground sculpture weakly areolate. Antennal scapes areolate. Cephalic dorsum uniformly densely areolate, with areolae organized into longitudinal rows by costulae, which become stronger near the frontal carinae; fine, concentric costulae surrounding the antennal insertions. Lateral surface of head densely areolate, with rugulose sculpture between the compound eye and the mandibular insertion. Ventral surface of head weakly areolate. Mesosoma uniformly areolate laterally, with fine costulae on the lateral face of the propodeum, meso- and metapleurae. Propodeal declivity shining through weakly areolate sculpture. Dorsal surface of mesosoma uniformly areolate, with rugulose sculpture on the pronotum. Femora shining through weak areolate sculpture. Petiole and postpetiole uniformly areolate; petiolar node costulate. First gastral tergite smooth and shining, with weak spectral iridescence. First gastral sternite smooth and shining.

Setae: antennal scapes and funiculi with moderately long, decumbent pilosity. Dorsum of the head, pronotum, waist segments, and gaster with moderately abundant, erect, blunt-tipped setae, the longest of which are about the width of the compound eye. The head bears ~30, mesosoma ~20, petiole 6, postpetiole ~14, and first gastral tergite ~30 setae. Short, sparse pubescence present over the entire body, but difficult to detect against the lightly colored integument and dense sculpture. Color: predominantly yellow, with masticatory margin of the mandible dark brown.

Type Material
Prebus (2021) - Holotype worker: MEXICO: Campeche: 10 km S Campeche, 28-29 June 1953, E.O. Wilson #125, 2nd growth thorn forest, strays, M.C.Z. Type 32436 (MCZ-ENT00032436, top).

Paratype workers: same pin as holotype, 1 worker (MCZ-ENT00032436, bottom) [MCZC]; same data as holotype, 1 worker (images of CASENT0912943 examined on antweb.org).

Etymology
Morphological, from the Greek ‘gonia’ (= angle) + ‘opsis’ (= sight), a reference to the weak anterior angle on the compound eyes.

References based on Global Ant Biodiversity Informatics

 * Brandao, C.R.F. 1991. Adendos ao catalogo abreviado das formigas da regiao neotropical (Hymenoptera: Formicidae). Rev. Bras. Entomol. 35: 319-412.
 * Castano-Meneses, G., M. Vasquez-Bolanos, J. L. Navarrete-Heredia, G. A. Quiroz-Rocha, and I. Alcala-Martinez. 2015. Avances de Formicidae de Mexico. Universidad Nacional Autonoma de Mexico.
 * Dattilo W. et al. 2019. MEXICO ANTS: incidence and abundance along the Nearctic-Neotropical interface. Ecology https://doi.org/10.1002/ecy.2944
 * Reynoso-Campos J. J., J. A. Rodriguez-Garza, and M. Vasquez-Bolanos. 2015. Hormigas (Hymenoptera: Formicidae) de la Isla Cozumel, Quintana Roo, Mexico (pp. 27-39). En: Castaño Meneses G., M. Vásquez-Bolaños, J. L. Navarrete-Heredia, G. A. Quiroz-Rocha e I. Alcalá-Martínez (Coords.). Avances de Formicidae de  México.  UNAM,  Universiad  de  Guadalajara, Guadalajara, Jalisco.
 * Vásquez-Bolaños M. 2011. Lista de especies de hormigas (Hymenoptera: Formicidae) para México. Dugesiana 18: 95-133