A taxonomic revision of the Neotropical myrmicine ant genus Lachnomyrmex Wheeler (Hymenoptera: Formicidae) Feitosa, R. M. Brandão, C. R. F. Zootaxa 2008 1890 1 49 urn:lsid:biosci.ohio-state.edu:osuc_concepts:245575 Insecta Formicidae Lachnomyrmex CoL Animalia Lachnomyrmex amazonicus Feitosa & Brandão Hymenoptera 11 Arthropoda species amazonicus  Figures 2, 20    Holotypeworker. BRAZIL: Para: Parauapebas, Fl. Nacional de Carajas, Garagem, 06°02'54"S 50°04'55''W,  25.iv - 02.v.2008, Rogerio R. Silvacol., no. 5 [ MZSP].   Paratypes. same data as holotype, no. 1 (1 worker) [ CASC]; same data, no. 4 (1 worker) [ CPDC]; same data (1 worker) [ ICNC]; same data, no. 5 (1 worker) [ USNM]; same data (1 worker) [ WMPC]; same data, nos. 1/2/3/4/5 (5 workers and 3 gynes) [ MZSP];  BRAZIL: Amazonas: Manaus,  22.ix.1993, A.B. Casimirocol., no. 4829 (1 worker) [ INPA];   iii - iv.1994, R. Didhamcol. (3 workers) [ BMNH]; same data (1 worker) [ MZSP];  Mato Grosso: Alta Floresta, 10°47'S 56°49'W,  28.iv.1999, H.L. Vasconceloscol. (1 worker) [ INPA];  Para: Melgaco, Caxiuana, 1°44'9"S 51°29'15"W,  27-29.i.2003, A.Y. Harada, E.P. Fagundes, P. Batra, R. Calisto& Mocols, no. 5 [ MPEG];  1°45'15"S 51°31'20"W,  23-25.i.2004, A.Y. Harada, E. P. Fagundes, R. Calisto & Mocols, no. 5 (1 worker) [ MZSP];  Parauapebas, Fl. Nacional de Carajas, Casa de Hospedes, 06°03'41''S 50°03'13"W,  25.iv - 02.v.2008, Rogerio R. Silvacol., no. 1 (1 worker) [ MZSP];  Nucleo Urbano, 06°03'53''S 50°03'42''W,  25.iv - 02.v.2008, Rogerio R. Silvacol., no. 1 (1 worker) [ MZSP];  Zoobotanico, 06°03'41''S 50°03'13''W,  25.iv - 02.v.2008, Rogerio R. Silvacol., no. 1 (1 worker) [ MZSP].    FIGURE2. Paratypeworker of Lachnomyrmex amazonicusfrom Para, Brazil: A, head in full face view; B, lateral view; C, dorsal view. Image by Michele Esposito, specimen CASENT0173882.  Worker diagnosis. Body irregularly rugose; promesonotum in profile elevated well above the level of propodeum; metanotal groove weakly impressed to obsolete; propodeal spines slightly directed upwards; teeth of propodeal lobes reduced; dorsum of postpetiole with more than 10 long, flexuous hairs; first gastral tergite entirely devoid of long hairs.    Holotypemeasurements. HL 0.58; HW 0.58; ML 0.16; SL 0.31; EL 0.11; WL 0.66; PSL 0.14; PL 0.28; PPL 0.13; GL 0.76; TL 2.57; CI 100; SI 54; OI 18. Worker measurements (n=6). HL 0.52-0.66; HW 0.54-0.66; ML 0.16-0.21; SL 0.31-0.41; EL 0.08- 0.13; WL 0.57-0.74; PSL 0.11-0.17; PL 0.22-0.29; PPL 0.12-0.15; GL 0.68-0.82; TL 2.26-2.84; CI 100- 103; SI 50-63; OI 13-19. Worker description. Color dark reddish-brown to blackish, with waist and gaster slightly lighter; appendages yellowish to light brown. Body densely covered by vermiculate short rugae, forming irregular areolae on promesonotum; rugae somewhat longer and longitudinal on head dorsum, and slightly sparser on mesopleura and lateral surfaces of propodeum; mandibles with short longitudinal striae restricted to basal portion; petiole and postpetiole finely and irregularly rugose. Abundant pilosity on head and mesosoma dorsum; dorsum of petiolar node and postpetiole each with more than 10 long, flexuous hairs; first gastral tergite entirely devoid of long hairs. Head as long as broad, with vertexal margin weakly convex; frontal lobes laterally rounded; eyes with about seven facets on maximum diameter. Promesonotum strongly convex in profile, elevated well above the level of propodeum; metanotal groove shallow to virtually obsolete; propodeal spines slightly directed upwards; teeth of propodeal lobes reduced, with around one-third of propodeal spines length. Petiolar node moderately elevated, dorsally rounded, and with the posterior face weakly sloped in lateral view; postpetiole feebly convex dorsally and without ventral processes. Gyne. Differing from worker by the larger eyes, with around 14 facets at maximum diameter; propodeal spines straight, without the apexes curved upwards.  Etymology. The name refers to the region from where this species is known, the Amazon Basin.  Comments. The general habitus of this species allies it with Lachnomyrmex longinoi,  L. nordestinus, L. plaumanni, and L. victori. These species share the irregular body sculpturation, the obsolete metanotal groove, and the absence of long hairs on the first tergite of gaster. However, L. amazonicuscan be distinguished from these species by the combination of promesonotum strongly convex, propodeal spines directed upwards, and dorsum of postpetiole bearing more than 10 long hairs.   Lachnomyrmex amazonicusis known from Amazonian Brazil, in 60-200melevation rainforest. It is one of the few species in the genus occurring in lowland forests rather than in submontane localities. All records refer to workers obtained in samples of sifted litter from the forest floor. 1416638460 2008-04-25 2008-05-02 2008-04-25 MZSP Brazil -6.048333 Fl. Nacional de Carajas 1 -50.081944 Parauapebas Para Holotype 1416638456 2008-05-02 2008-05-02 2008-04-25 CASC Brazil -6.048333 Fl. Nacional de Carajas 1 -50.081944 Parauapebas Para Paratypes 1416638455 2008-05-02 2008-05-02 2008-04-25 CPDC Brazil -6.048333 Fl. Nacional de Carajas 1 -50.081944 Parauapebas Para 1416638467 2008-05-02 2008-05-02 2008-04-25 ICNC Brazil -6.048333 Fl. Nacional de Carajas 1 -50.081944 Parauapebas Para 1416638469 2008-05-02 2008-05-02 2008-04-25 USNM Brazil -6.048333 Fl. Nacional de Carajas 1 -50.081944 Parauapebas Para 1416638449 2008-05-02 2008-05-02 2008-04-25 WMPC Brazil -6.048333 Fl. Nacional de Carajas 1 -50.081944 Parauapebas Para 1416638446 2008-05-02 2008-05-02 2008-04-25 MZSP Brazil -6.048333 Fl. Nacional de Carajas 1 -50.081944 Parauapebas Para 1416638451 1993-09-22 INPA A. B. Casimiro Brazil Manaus Manaus Amazonas 1416638461 1994-03 1994-04-31 1994-03 BMNH R. Didham Brazil Manaus Manaus Amazonas 1416638447 1994-03 1994-04-31 1994-03 MZSP R. Didham Brazil Manaus Manaus Amazonas 1416638453 1999-04-28 INPA H. L. Vasconcelos Brazil -10.783334 Alta Floresta 1 -56.816666 Mato Grosso 1416638454 2003-01-27 2003-01-29 2003-01-27 MPEG A. Y. Harada, E. P. Fagundes, P. Batra, R. Calisto & Mo Brazil -1.7358334 Caxiuana 1 -51.4875 Melgaco Para 1416638458 2004-01-23 2004-01-25 2004-01-23 MZSP A. Y. Harada, E. P. Fagundes, R. Calisto & Mo Brazil -1.7541667 Caxiuana 1 -51.52222 Melgaco Para 1416638471 2008-04-25 2008-05-02 2008-04-25 MZSP Brazil -6.061389 Fl. Nacional de Carajas 1 -50.05361 Parauapebas Para 1416638459 2008-04-25 2008-05-02 2008-04-25 MZSP Brazil -6.0647225 Rogerio R. Silva 1 -50.061665 Nucleo Urbano Para 1416638440 2008-04-25 2008-05-02 2008-04-25 MZSP Brazil -6.061389 Rogerio R. Silva 1 -50.05361 Zoobotanico Para