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:245579 Insecta Formicidae Lachnomyrmex CoL Animalia Lachnomyrmex longinoi Feitosa & Brandão Hymenoptera 25 Arthropoda species longinoi  Figures 9, 18    Holotypeworker. COSTA RICA: Guanacaste: Est. Pitilla,  9kmS Sta. Cecilia, LN 330200_380200,  16- 18.viii.1993, P. Rioscol., no. INBIOCRI0001657358[ INBC].   Paratypes. same data as holotype, no INBIOCRI001657147(1 worker) [ MZSP]; no INBIOCRI0001657202(1 worker) [ INBC];  COSTA RICA: Alajuela: Rio San Lorencito, 1990, P. Hammondcol. (2 workers) [ BMNH]; same data (1 worker) [ MZSP];  Guanacaste: Pitilla Field Station,  2.v.1995, R. Andersoncol., no. 17721 (1 worker) [ WPMC];  Heredia: La Selva,  15.iv.1985, J. Memmottcol. (3 workers) [ BMNH];  Limon: Cerro Cocori, Fca. de E. Rojas,  vi.1991, E. Rojascol., no. INBIOCRI000636130(1 worker) [ INBC];   30kmN Cariari,  i.1993, E. Rojascol., no. INBIOCRI000675271(1 worker) [ INBC];  Puntarenas: Peninsula Osa, Aenn. Fund. Neotrop.,  23.vi.1997, R. Andersoncol., no. 18686/18687 (5 workers and 1 gyne) [ WPMC]; same data (1 gyne) [ MZSP]; same data (1 worker) [ CASC]; same data (1 worker) [ CPDC]; same data (1 worker) [ USNM];  Cerro Helado,  15kmNE Rincon,  24.vi.1997, R. Andersoncol., no. 18689 (1 worker and 1 gyne) [ WPMC];  Peninsula Osa, Cerro Helado,  21.vi.1997, R. Andersoncol., no. 18685 (2 workers and 1 gyne) [ WPMC].  Worker diagnosis. Body densely and irregularly rugose; metanotal groove obsolete; teeth of propodeal lobes well developed and projected over petiolar peduncle; petiolar node high and subtriangular; pilosity on dorsum of postpetiole exceptionally dense; first tergite of gaster completely devoid of long flexuous hairs.   Holotypemeasurements. HL 0.72; HW 0.74; ML 0.24; SL 0.43; EL 0.16; WL 0.84; PSL 0.19; PL 0.35; PPL 0.18; GL 0.88; TL 3.21; CI 102; SI 58; OI 21. Worker measurements (n=20). HL 0.66-0.72; HW 0.65-0.74; ML 0.22-0.25; SL 0.39-0.46; EL 0.13- 0.17; WL 0.76-0.87; PSL 0.16-0.19; PL 0.31-0.36; PPL 0.16-0.19; GL 0.85-0.94; TL 2.98-3.32; CI 98-102; SI 58-66; OI 20-24. Gyne measurements (n=5). HL 0.65-0.79; HW 0.65-0.79; ML 0.21-0.24; SL 0.39-0.44; EL 0.17-0.20; WL 0.87-1.06; PSL 0.16-0.20; PL 0.36-0.43; PPL 0.17-0.24; GL 0.96-1.12; TL 3.24-3.86; CI 100-102; SI 56-61; OI 26-27. Worker description. Color dark brown to black, with lighter appendages. Body densely covered by vermiculate short rugae, forming irregular areolae on head and promesonotum, and slightly sparser on mesopleura and lateral surfaces of propodeum; mandibles with short longitudinal striae restricted to basal portion; petiole and postpetiole irregularly rugose. Abundant pilosity on head and promesonotum dorsum; dorsum of petiolar node with about six long hairs; dorsum of postpetiole densely covered by long flexuous hairs; first gastral tergite entirely devoid of long hairs. Head as long as broad, with vertexal margin weakly convex; frontal lobes subquadrate; eyes with about seven facets on maximum diameter. Promesonotum elevated well above the level of propodeum in profile; metanotal groove virtually obsolete; propodeal spines straight; teeth of propodeal lobes widen basally and slight longer than the half-length of propodeal spines. Petiolar node elevated and subtriangular in lateral view; postpetiole strongly convex dorsally and without ventral projections. Gyne. Similar to worker. In addition, eyes with around 12 facets at maximum; wings with the basic pattern of venation for the genus; propodeal spines and teeth of propodeal lobes reduced; petiolar node comparatively lower; ventral face of postpetiole moderately projected; surface of first gastral tergite covered by long flexuous hairs, relatively dense anteriorly, becoming sparser posteriorly.  Etymology. This species is named in honor of Dr. John "Jack" Longino in recognition of his many years of devoted work on the ants of Costa Rica and for his valuable support during the elaboration of this work.  Comments. The well developed teeth of propodeal lobes allied to the dense pilosity on postpetiole dorsum separate this species from the related Lachnomyrmex amazonicus,  L. nordestinus, L. plaumanni, and L. victori. Gynes of L. longinoican be confounded with L. scrobiculatusby the subtriangular petiolar node and thepresence of long hairs on first gastral tergite. However, gynes of L. scrobiculatuspresent an anteroventral projection in the postpetiole, which is absent in this species.  Apparently, L. longinoiis commonly encountered in leaf litter samples from wet forests ( 100-1200m) of Costa Rica and Panama.   FIGURE 9. Worker of Lachnomyrmex longinoifrom Puntarenas, Costa Rica: A, head in full face view; B, lateral view; C, dorsal view. Image by April Nobile, specimen PSW7771-6.    Additionalmaterial examined. COSTA RICA: Puntarenas:  3kmN Ciudad Neily, 8°41'N 82°57'W,  210m,  31.viii.1985, P.S. Wardcol., no. 7771-6 (1 worker, examined by images) [ UCDC];  Carara Biological Reserve, Estacion Quebrada Bonita,  30m,  23.vii.1985, J. Longinocol., no. INBIOCRI002280159(1 gyne, examined by images) [ INBC];  Manuel Antonio Nat. Park,  20m,  27.vii.1985, J. Longinocol., no. INBIOCRI002280165(1 worker, examined by images) [ JTLC].  PANAMA: Canal Zone: Barro Colorado,  vii - viii.1946, J. Zetekcol., no. 5239 (1 worker) [ USNM];  1976, S. Levingscol. (1 worker) [ MIZA];  Chiquiri: Cerro Campana,  5.iv.1995, R. Andersoncol., no. 17837 (4 workers) [ WPMC]; same data (1 worker) [ ICNC]; same data (1 worker) [ MZSP];   20.4km North San Felix,  8.vi.1995, R. Andersoncol., no. 17768 (2 workers) [ WPMC]. 1416638475 1993-08-16 1993-08-18 1993-08-16 INBC P. Rios Costa Rica Sta. Cecilia Est. Pitilla INBIOCRI 0001657358 Guanacaste Holotype 1416638483 1993-08-16 1993-08-18 1993-08-16 MZSP P. Rios Costa Rica Sta. Cecilia Est. Pitilla INBIOCRI 001657147 Guanacaste Paratypes 1416638465 1993-08-16 1993-08-18 1993-08-16 INBC P. Rios Costa Rica Sta. Cecilia Est. Pitilla INBIOCRI 0001657202 Guanacaste 1416638491 1990 BMNH P. Hammond Costa Rica Rio San Lorencito Alajuela 1416638486 1990 MZSP P. Hammond Costa Rica Rio San Lorencito Alajuela 1416638493 1995-05-02 WPMC R. Anderson Costa Rica Pitilla Field Station Guanacaste 1416638484 1985-04-15 BMNH J. Memmott Costa Rica La Selva Heredia 1416638478 1991-06 INBC E. Rojas Costa Rica Cerro Cocori, Fca. de E. Rojas INBIOCRI 000636130 Limon 1416638477 1993-01 INBC E. Rojas Costa Rica Cariari INBIOCRI 000675271 Limon 1416638492 1997-06-23 WPMC R. Anderson Costa Rica Aenn. Fund. Neotrop Peninsula Osa Puntarenas 1416638495 1997-06-23 MZSP R. Anderson Costa Rica Aenn. Fund. Neotrop Peninsula Osa Puntarenas 1416638473 1997-06-23 CASC R. Anderson Costa Rica Aenn. Fund. Neotrop Peninsula Osa Puntarenas 1416638464 1997-06-23 CPDC R. Anderson Costa Rica Aenn. Fund. Neotrop Peninsula Osa Puntarenas 1416638476 1997-06-23 USNM R. Anderson Costa Rica Aenn. Fund. Neotrop Peninsula Osa Puntarenas 1416638481 1997-06-24 WPMC R. Anderson Costa Rica Rincon Cerro Helado Puntarenas 1416638474 1997-06-21 WPMC R. Anderson Costa Rica Cerro Helado Peninsula Osa Puntarenas 1416638479 1985-08-31 UCDC P. S. Ward Costa Rica 210 m 8.683333 Ciudad Neily 1 -82.95 Ciudad Neily Puntarenas 1416638480 1985-07-23 INBC J. Longino Costa Rica 30 m 8.683333 Estacion Quebrada Bonita 1 -82.95 Carara Biological Reserve INBIOCRI 002280159 Puntarenas 1416638487 1985-07-27 JTLC J. Longino Costa Rica 20 m 8.683333 Manuel Antonio Nat. Park 1 -82.95 Carara Biological Reserve INBIOCRI 002280165 Puntarenas 1416638496 1946-07 1946-08-31 1946-07 USNM J. Zetek Panama Barro Colorado Canal Zone 1416638485 1976 MIZA S. Levings Panama Barro Colorado Canal Zone 1416638463 1995-04-05 WPMC R. Anderson Panama Cerro Campana Chiquiri 1416638472 1995-04-05 ICNC R. Anderson Panama Cerro Campana Chiquiri 1416638482 1995-04-05 MZSP R. Anderson Panama Cerro Campana Chiquiri 1416638494 1995-06-08 WPMC R. Anderson Panama North San Felix Chiquiri