Crematogaster wardi,

Longino, J. T., 2003, The Crematogaster (Hymenoptera, Formicidae, Myrmicinae) of Costa Rica., Zootaxa 151, pp. 1-150: 123-125

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Crematogaster wardi


Crematogaster wardi  HNS  NEW SPECIES

Plate 7

Holotype worker

Costa Rica, Prov. Heredia, La Selva Biological Station , 10°26'N, 84°01'W, 50m , 17 Mar 1993 (Longino, collection code JTL3408-s) [ INBC, specimen code INBIOCRI001238528].



One worker, same data as holotype [ BMNH, specimen code INBIOCRI001238527]GoogleMaps  ; one worker, same locality, 3 Mar 1989 (Longino, collection code JTL2460-s) [ LACM, specimen code INBIOCRI001281212]GoogleMaps  ; one worker, same locality, 18- 22 Jun 1999 (INBio-OET, Project ALAS collection code W/13/008) [ MCZC, specimen code INBIOCRI002719786];GoogleMaps  one worker, same data [ MHNG, specimen code INBIOCRI002719787];GoogleMaps  one worker, same data [ NHMB, specimen code INBIOCRI002719788];GoogleMaps  one worker, same locality and date (INBio-OET, Project ALAS collection code W/11/006) [ UCDC, specimen code INBIOCRI002720566];GoogleMaps  one worker, same data [ USNM, specimen code INBIOCRI002720567]GoogleMaps  .

Crematogaster  HNS  JTL-013: Longino et al. 2002.


Costa Rica.

Description of worker

Color yellow orange; workers monomorphic in size.

Mandibles feebly striate on proximal half, smooth and shining with large piligerous puncta on distal half; clypeus with two longitudinal carinulae at anterior margin, anterior margin gently convex to straight; head longer than wide, with rounded posterior border; antenna with terminal two segments enlarged to form a club, third segment from end somewhat enlarged, blurring distinction between two and three-segmented club; scapes with abundant suberect flexuous setae; when scapes laid back from antennal insertions, they distinctly surpass margin of vertex; face smooth and shining, with a few concentric carinulae around antennal insertion; face covered with abundant, long, erect, flexuous, white setae, no appressed pubescence; in face view setae project from lateral and posterior margins.

Promesonotum in lateral profile somewhat flattened, pronotum and anterodorsal face of mesonotum of similar length, nearly in same plane; posterior face of mesonotum short, meeting dorsal face at angle but not produced or tuberculate, dropping to propodeal suture; propodeal suture deep in dorsal view but partially obscured in profile by lateral carinulae that bridge the suture; propodeum with short, differentiated dorsal face and longer posterior face; propodeal spines medium length, spiniform, directed posteriorly and weakly curving upward; pronotal dorsum with sparse longitudinal carinulae, interspaces smooth and shining; mesonotum with parallel lateral carinae that converge toward propodeal suture; medial mesonotum concave, smooth and shining; dorsal face of propodeum feebly rugulose, posterior face smooth and shining; side of pronotum smooth and shining; katepisternum smooth and shining medially, feebly punctate at margins; side of propodeum shining, largely smooth with traces of feeble carinulae ventrally; promesonotum with long flexuous white to amber erect setae in three ranks, four across anterior pronotum, two at anterior mesonotum, and two at mesonotal midlength; humeral setae are longest(0.21mm), other six are subequal in length (0.15mm); propodeal dorsum with one or two pairs long setae, on base of propodeal spines and half way along spine shaft; short inconspicuous setae sparsely scattered elsewhere on mesosomal dorsum; tibiae with abundant short subdecumbent setae, none longer than maximum tibial width.

Petiole in side view trapezoidal, punctate; anteroventral tooth present, rounded, rightangle, or acute; dorsal face of petiole smooth and shining, subrectangular, longer than wide, with about eight long amber setae along posterior border; postpetiole with acute anteroventral tooth, postpetiole in dorsal view subquadrate, wider than long, with emarginate posterior margin, abundant long setae; fourth abdominal tergite smooth and shining, with abundant long suberect amber setae, no appressed pubescence.


Workers vary in robustness and coloration. Small workers are relatively paler, with weaker sculpture on the katepisternum and flatter promesonotum. Large workers are darker orange, with stronger punctate sculpture on the katepisternum, and a more arched promesonotum. The two collections I have from the Osa Peninsula are small and pale. Material from La Selva Biological Station varies from small and pale to larger and darker. Three workers collected at 1070m elevation in Braulio Carrillo National Park above La Selva vary from small and pale to larger and darker orange. A series of three workers from Bajo La Hondura, an 1100m elevation site near the southeastern edge of Braulio Carrillo, are the largest I have seen, with distinctly arched promesonotum, and lacking the anterior row of long setae on the pronotum. I initially had access to only these large workers and the specimens from the Osa Peninsula, and I considered them distinct species. Subsequent collections from La Selva revealed variation linking the two forms. It is likely that there is some form of clinal variation on the Atlantic slope, with small pale forms dominating in the lowlands and larger, darker forms more common at higher elevations, a pattern seen in many other ant lineages.


Holotype: HL 0.537, HW 0.546, HC 0.493, SL 0.473, EL 0.156, WL 0.618, SPL 0.110, PTH 0.143, PTL 0.201, PTW 0.162, PPL 0.141, PPW 0.181, CI 102, OI 29, SI 88, PTHI 71, PTWI 81, PPI 128, SPI 18.

Other specimens: HL 0.581, 0.547, 0.669; HW 0.615, 0.554, 0.683; HC 0.570, 0.495, 0.626; SL 0.499, 0.472, 0.640; EL 0.162, 0.168, 0.186; A11L 0.241; A11W 0.128; A10L 0.105; A10W 0.111; A09L 0.054; A09W 0.086; A08L 0.046; A08W 0.059; WL 0.676, 0.626, 0.801; SPL 0.142, 0.123, 0.163; PTH 0.168, 0.138, 0.178; PTL 0.213, 0.196, 0.267; PTW 0.194, 0.159, 0.218; PPL 0.145, 0.158, 0.177; PPW 0.209, 0.180, 0.241; CI 106, 101, 102; OI 28, 31, 28; SI 86, 86, 96; PTHI 79, 70, 67; PTWI 91, 81, 82; PPI 144, 114, 136; SPI 21, 20, 20; ACI 0.80.


This species is named for Phillip S. Ward at the University of California at Davis. Phil taught me how to mount ants.


Crematogaster wardi  HNS  occurs in mature wet forest habitats on both the Atlantic and Pacific slopes of Costa Rica. The species is known only from workers. They have been collected three times as nocturnal foragers on low vegetation, once as diurnal foragers on extrafloral nectaries of an Inga  sapling, twice in Malaise traps, and three times in Winkler samples of sifted leaf litter from the forest floor.


Crematogaster wardi  HNS  is uniquely characterized by the combination of (1) yellow coloration; (2) humeral setae of mesosomal dorsum long, flexuous, and longer than any other mesosomal setae; (3) relatively long propodeal spines; and (4) relatively elongate promesonotum. Similar species are minutissima  HNS  and flavomicrops  HNS  .


United Kingdom, London, The Natural History Museum [formerly British Museum (Natural History)]


USA, California, Los Angeles, Los Angeles County Museum of Natural History


USA, Massachusetts, Cambridge, Harvard University, Museum of Comparative Zoology


Switzerland, Geneva, Museum d'Histoire Naturelle


Switzerland, Basel, Naturhistorisches Museum


USA, California, Davis, University of California, R.M. Bohart Museum of Entomology


USA, Washington D.C., National Museum of Natural History, [formerly, United States National Museum]