Lachnomyrmex amazonicus Feitosa & Brandão

Feitosa, Rodrigo M. & Brandão, Carlos Roberto F., 2008, A taxonomic revision of the Neotropical myrmicine ant genus Lachnomyrmex Wheeler (Hymenoptera: Formicidae), Zootaxa 1890, pp. 1-49: 11-13

publication ID

10.5281/zenodo.184304

persistent identifier

http://treatment.plazi.org/id/03FF87C1-FF98-D20A-FF79-CA20FC0EAA32

treatment provided by

Plazi

scientific name

Lachnomyrmex amazonicus Feitosa & Brandão
status

new species

Lachnomyrmex amazonicus Feitosa & Brandão  , new species

Figures 2 View Figure , 20 View Figure

Holotype worker. BRAZIL: Pará: Parauapebas, Fl. Nacional de Carajás, Garagem, 06º02' 54 ''S 50 º04' 55 ''W, 25.iv–02.v. 2008, Rogério R. Silva col., no. 5 [ MZSPAbout MZSP].

Paratypes. same data as holotype, no. 1 (1 worker) [ CASC]; same data, no. 4 (1 worker) [ CPDCAbout CPDC]; same data (1 worker) [ ICNC]; same data, no. 5 (1 worker) [ USNMAbout USNM]; same data (1 worker) [ WMPC]; same data, nos. 1 / 2 / 3 / 4 / 5 (5 workers and 3 gynes) [ MZSPAbout MZSP]; BRAZIL: Amazonas: Manaus, 22.ix. 1993, A.B. Casimiro col., no. 4829 (1 worker) [ INPAAbout INPA]; iii-iv. 1994, R. Didham col. (3 workers) [ BMNH]; same data (1 worker) [ MZSPAbout MZSP]; Mato Grosso: Alta Floresta, 10 º 47 'S 56 º 49 'W, 28.iv. 1999, H.L. Vasconcelos col. (1 worker) [ INPAAbout INPA]; Pará: Melgaço, Caxiuanã, 1 º 44 ' 9 ''S 51 º 29 ' 15 "W, 27–29.i. 2003, A.Y. Harada, E.P. Fagundes, P. Batra, R. Calisto & Mó cols, no. 5 [ MPEGAbout MPEG]; 1 º 45 ' 15 ''S 51 º 31 ' 20 "W, 23–25.i. 2004, A.Y. Harada, E. P. Fagundes, R. Calisto & Mó cols, no. 5 (1 worker) [ MZSPAbout MZSP]; Parauapebas, Fl. Nacional de Carajás, Casa de Hóspedes, 06º03' 41 ''S 50 º03' 13 ''W, 25.iv–02.v. 2008, Rogério R. Silva col., no. 1 (1 worker) [ MZSPAbout MZSP]; Núcleo Urbano, 06º03' 53 ''S 50 º03' 42 ''W, 25.iv–02.v. 2008, Rogério R. Silva col., no. 1 (1 worker) [ MZSPAbout MZSP]; Zoobotânico, 06º03' 41 ''S 50 º03' 13 ''W, 25.iv–02.v. 2008, Rogério R. Silva col., no. 1 (1 worker) [ MZSPAbout MZSP].

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.

Holotype measurements. 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. amazonicus  can 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 amazonicus  is known from Amazonian Brazil, in 60–200m elevation 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.

MZSP

Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo

CPDC

Centro de Pesquisas do Cacau

USNM

Smithsonian Institution, National Museum of Natural History

INPA

Instituto Nacional de Pesquisas da Amazonia

MPEG

Museu Paraense Emilio Goeldi