Odontomachus latidens Mayr, 1867

Satria, Rijal, Kurushima, Hiroaki, Herwina, Henny, Yamane, Seiki & Eguchi, Katsuyuki, 2015, The trap-jaw ant genus Odontomachus Latreille (Hymenoptera: Formicidae) from Sumatra, with a new species description, Zootaxa 4048 (1), pp. 1-36 : 11-14

publication ID	https://doi.org/ 10.11646/zootaxa.4048.1.1
publication LSID	lsid:zoobank.org:pub:635F2D91-E791-4918-9D77-763F39EF217C
DOI	https://doi.org/10.5281/zenodo.5672375
persistent identifier	https://treatment.plazi.org/id/3105E946-DE31-FF86-FF51-5DA4FDC5F849
treatment provided by	Plazi
scientific name	Odontomachus latidens Mayr, 1867
status

Treatment

Odontomachus latidens Mayr, 1867 View in CoL

( Figs. 1 View FIGURE 1 , 5 View FIGURE 5 , 6 View FIGURE 6 , 7 View FIGURE 7 , 17, 18)

Odontomachus latidens Mayr, 1867: 48 View in CoL , queen, type locality: Indonesia (Java). Emery, 1887: 428; Emery, 1892: 560 (w); Crawley, 1924: 388; Karavaiev, 1925: 292 (w); Chapman & Capco, 1951: 45; Brown, 1976: 157; Imai, Brown, et al. 1984: 67 (k).

Non-type materials examined. Indonesia: Sumatra: Aceh: Leuser Ecosystem (ca. 1100 m alt.), 20.IX.2012, S. Rijal leg., GK-38-12, 29 workers, 5 queens ( SKYC, RSC); North Sumatra: Danau Toba, Parapat (900 m alt.), 20.VIII.2002, Sk. Yamane leg., 2 workers ( SKYC, RSC). Java: Banten: Cibodas, 29.11.2009, M. Ohashi leg., 1 queen ( SKYC, RSC); same loc., Mt. Gede, Dec-1999, F. Ito leg., 1 worker ( SKYC, RSC); Yogyakarta: G. Merapi, Kaliadem (800–1000 m alt.), 31.XII.2002, F. Yamane leg., JV02/03-SKY-39, 2 workers, 1 queen ( SKYC, RSC). Malaysia: Malay Peninsula: Pahang: near Genting H.L., Bunga Buah (ca. 1000 m alt.), 6.VII.1999, Sk. Yamane leg., 1 worker ( SKYC, RSC).

Material used for DNA barcoding. Colony GK-38-12 (individual no. RJ20150126-4, accession no. LC056037 View Materials ).

Worker measurements and indices. Non-types (n=10): HW 2.43–3.13 mm, HL 3.23–4.05 mm, SL 2.83–3.65 mm, IFLW 0.60–0.76 mm, EL 0.31–0.40 mm, MDL 1.67–2.09 mm, WL 3.50–4.30 mm, PTL 0.50–0.69 mm, PTH 1.26–1.58 mm, CI 73–77, SI 109–123, MDI 51–55, PTHI 226–280.

Worker description. Relatively large (HL 3.23–4.05 mm, WL 3.50–4.30 mm). Head in full-face view slightly longer than broad, with posterior margin weakly concave (sometimes almost straight); median furrow on vertex present as dark line; each side of line hardly humped; frontal lobes followed by strong frontal carinae which are slightly divergent posteriad and then become nearly parallel; minimum distance between margin of ocular ridge and margin of compound eye half as long as major axis of compound eye; mandible relatively slender; masticatory margin with very small denticles along its length, or only with preapical angle (without denticles); subapical tooth shorter than broad, with truncate apex; palp formula 4, 4. Mesosoma in lateral view stout; pronotum including its anteromedian lobe short, in lateral view with anterodorsal slope relatively steep; mesopleuron without anteroventral ridge, with anterodorsal margin weakly carinate, clearly separated by distinct dorsal carina from mesonotum and metapleuron; propodeum in lateral view with dorsum slightly convex, and gradually sloping posteriad, with posterior face steeply sloping; propodeal dorsum anteriorly with very weak median longitudinal depression. Petiolar node conical, with sharply pointed apical spine; node in lateral view, excluding apical spine with anterior face weakly convex or weakly and bluntly angulate, and posterior face weakly convex; apical spine short and relatively slender, less than 1/4 as long as petiolar height, sometimes weakly curved posteriad (but shape variable within species); subpetiolar process anteroposteriorly shorter than dorsoventrally high, lobate, directed ventrally. First gastral tergum in lateral view relatively short, with anterior face moderately long and vertical.

Head in full-face view largely smooth and shiny, but with striate area bordered by frontal carinae and ocular ridges; frontal lobe smooth and shiny; extraocular furrow smooth and shiny; median part of vertex along median furrow smooth and shiny; lateral face and venter of head smooth and shiny; median disc of clypeus almost smooth and shiny. Pronotal disc and mesonotum in dorsal view densely and transversely striate; posterolateral face of pronotum partly smooth and shiny; mesopleuron largely smooth and shiny, with anterior 1/4 finely striate; metapleuron moderately striate in its anterior 2/3, and smooth and shiny or faintly striate in its posterior 1/3; propodeum with transverse striation which is a little sparser and stronger than pronotum and mesonotum. Petiolar node largely smooth and shiny, but sometimes with its basal area faintly striate.

Vertex with a pair of long erect setae; frontal lobe without seta; pronotal disc without long erect setae; 1st gastral tergum with erect setae (but often missing artificially) which are 2/3 as long as setae on vertex. Head, mesosoma, petiole and gaster with fine appressed pubescence which is sparse and very short on head and gaster.

For color pattern see in Fig. 5 View FIGURE 5 ; body reddish brown ( Fig. 5 View FIGURE 5 ) to brown; gaster a little darker than head and mesosoma; all legs yellowish brown.

Queen measurements and indices. Non-type material (n=7): HW 2.89–2.99 mm, HL 3.60–3.95 mm, SL 3.35–3.55 mm, IFLW 0.70–0.76 mm, EL 0.50–0.52 mm, OL 0.13–0.20 mm, MDL 1.97–2.05 mm, WL 4.55–4.75 mm, FWL 10.48–11.17 mm, PTL 0.69–0.71 mm, PTH 0.94–1.85 mm, CI 76–80, SI 116–118, MDI 50–58, PTHI 131–277.

Queen description. In general appearance queen is similar to worker. Vertex near ocelli not swollen; ocular ridge clearly developed; distance between lateral ocelli as long as distance between lateral and median ocelli, and as long as major axis of median ocellus; ocelli in lateral view protruded dorsad. Mesosoma with main sclerites associated with wing function ( Figs. 6 View FIGURE 6 B, 6C), in dorsal view short and stout; anterodorsal slope of pronotum in lateral view steep; anterodorsal outline of mesoscutum in lateral view relatively steep; mesoscutum with very weak posteromedian depression; parapsidal furrow very weak and slightly curved; mesopleuron without oblique furrow; propodeum in lateral view relatively short, with dorsum very weakly convex and gradually sloping posteriad. Wing venation as in Figs. 6 View FIGURE 6 E and 6F. Petiolar node in lateral view, excluding apical spine with anterior face almost straight to weakly convex, and its posterior face weakly convex; apical spine short and relatively slender, and sometimes weakly curved posteriad (but variable in shape within species); subpetiolar process anteroposteriorly longer than dorsoventrally high. First gastral tergum in lateral view relatively short, with anterior face moderately long and vertical.

Head in full-face view largely smooth and shiny, but with striate area bordered by frontal carinae and ocular ridges; frontal lobe smooth and shiny; extraocular furrow faintly striate; median part of vertex along median furrow smooth and shiny; lateral face and venter of head smooth and shiny; median disc of clypeus almost smooth and shiny. Pronotum densely and weakly striate transversely; mesoscutum largely smooth and shiny, with faint striae on posteromedian depression and along posterior margin; mesopleuron largely smooth and shiny, with anteriormost part faintly striate; mesoscutellum smooth and shiny; propodeum strongly and sparsely striate transversely. Petiolar node excluding spine largely striate faintly.

Pair of long erect setae present on vertex near lateral ocelli; frontal lobe and pronotal disc without erect setae; 1st gastral tergum with erect setae (but often missing artificially) which are shorter than setae on vertex near ocelli. Head, mesosoma, petiole and gaster with sparse subdecumbent to decumbent pubescence which is extremely short on gaster; mesopleuron very sparsely pubescent.

For color pattern see in Fig 6 View FIGURE 6 . Body reddish brown ( Fig. 6 View FIGURE 6 ) to brown; gaster a little darker than head and mesosoma; all legs yellowish brown.

Male measurements and indices. Non-types (n=7): HW 1.60–1.65 mm, HL 1.26–1.31 mm, SL 0.26–0.28 mm, EL 0.88–0.91 mm, EW 0.50–0.51 mm, OL 0.20–0.22 mm, OES 0.26–0.28 mm, WL 3.55–3.70 mm, FWL 7.05–7.25 mm, PTL 0.63–0.64 mm, PTH 0.97–1.03 mm, CI 123–128, SI 16–18, PTHI 151–164.

Male description. Size large (HL 1.26–1.31 mm, WL 3.55–3.70 mm). Major axis of median ocellus smaller than minimum distance between lateral ocelli; antenna 13-merous; scape very short, 1/3 as long as 3rd antennomere; 2nd antennomere 1/2 as long as scape; 3nd to 13th antennomeres each extremely long; palp formula 6, 4; dorsal outline of clypeus in lateral view weakly convex. Mesosoma in lateral view relatively slender and long; dorsal outline of pronotum in lateral view weakly convex; anterodorsal outline of mesoscutum in lateral view relatively steeply sloping; mesoscutum with short weak median longitudinal depression; parapsidal furrow weak and slightly curved; oblique mesopleural furrow relatively shallow and narrow; ventrolateral part of katepisternum with a very weak longitudinal furrow; propodeum in lateral view with its dorsal outline roundly convex; metapleuron separated from propodeum indistinctly by a suture; wing venation similar to queen (see Figs. 6 View FIGURE 6 E and 6F for queen wings). Petiolar node in lateral view tapering gently to rounded apex with its anterior slope straight, and its posterior slope much steeper and shallowly concave; subpetiolar process in lateral view anteroposteriorly shorter than dorsoventrally high, lobate and slender; petiolar sternum without posteroventral process. First gastral tergum in lateral view long; posterior spine of 8th abdominal tergum short and thick, very weakly curved (Fig. 18C); pygostyle digitiform, with long setae in apical 2/3; disc of 9th abdominal sternite not clearly differentiated from apical lobe, gradually merging into apical lobe, with basal margin almost straight; apical lobe gently tapering apicad, with apical margin truncated; telomeral apex in lateral view longer than high; distiventral apex of valviceps weakly produced; basiventral corner of valviceps not produced; ventral margin of valviceps with 27−30 denticles.

Head largely smooth and shiny, with area between lateral ocelli faintly striate. Pronotum in dorsal view smooth and shiny; mesoscutum faintly and longitudinally striate or sometimes smooth and shiny; scuto-scutellar suture with sparse, strong, longitudinal rugae; mesopleural anepisternum and katepisternum smooth and shiny; propodeum with sparse, strong, longitudinal striate. Petiole smooth and shiny.

Head, mesosoma, legs, petiole, and gaster with fine dense subdecumbent to decumbent pubescence; mandible, vertex near ocelli and gaster except 1st gastral tergum with several long erect setae.

For color pattern see in Fig. 7 View FIGURE 7 ; head including scape, mesosoma, legs yellowish brown; funiculus dark brown; petiole and gaster darker than head and mesosoma.

Species recognition. The identities of O. latidens and O. procerus are discussed under O. procerus .

Distribution. Known from Indonesia (Sumatra and Java) and Peninsular Malaysia.

Bionomics. Odontomachus latidens inhabits secondary and primary forests in the highlands (ca. 800–1300 m alt.), and nests in the soil near the base of living trees. The colony GK-38-12, from Leuser Ecosystem, Aceh Province, was collected nesting together with Pheidole tandjongensis Forel, 1913 (colony GK-39-12). Details concerning the nature of their relationship are unknown.

CO1. See remarks under O. procerus .