Crematogaster flavosensitiva

Crematogaster flavosensitiva occurs in lowland seasonal to wet forest habitats. The few known collections are from Winkler samples of sifted litter from the forest floor or from baits on or near the forest floor. The type series is from a nest that was in a rotten fruit exocarp in the leaf litter. (Longino 2003)

Identification
Longino (2003) - The presence of one or two extremely long flexuous setae on the hind tibia (much longer than the underlying suberect pilosity) is unique to two species, Crematogaster sumichrasti and flavosensitiva. The propodeal spines are upturned in sumichrasti, directed posteriorly in flavosensitiva. Although not known from Costa Rica, this species has been collected numerous times on Barro Colorado Island in Panama. It is related to Crematogaster flavomicrops, Crematogaster minutissima, Crematogaster monteverdensis, sumichrasti, and Crematogaster wardi, sharing with all these (1) yellow coloration; (2) shiny face; (3) abundant erect flexuous setae on face, mesosoma, and tibiae; and (4) subquadrate dorsal face of petiole.

Distribution based on Regional Taxon Lists
Neotropical Region: Brazil, Colombia, Panama, Venezuela.

Nomenclature

 *  flavosensitiva. Crematogaster flavosensitiva Longino, 2003a: 70, pl. 2 (w.q.) VENEZUELA.

Worker
Holotype: HL 0.582, HW 0.619, HC 0.549, SL 0.538, EL 0.161, WL 0.615, SPL 0.152, PTH 0.147, PTL 0.225, PTW 0.173, PPL 0.147, PPW 0.190, CI 106, OI 28, SI 92, PTHI 65, PTWI 77, PPI 129, SPI 25. Other specimens: HL 0.557, 0.504, 0.532; HW 0.614, 0.537, 0.566; HC 0.540, 0.479, 0.490; SL 0.532, 0.485, 0.504; EL 0.153, 0.137, 0.144; A11L 0.243; A11W 0.100; A10L 0.111; A10W 0.083; A09L 0.057; A09W 0.063; A08L 0.037; A08W 0.051; WL 0.598, 0.509, 0.542; SPL 0.142, 0.126, 0.140; PTH 0.156, 0.116, 0.138; PTL 0.205, 0.181, 0.208; PTW 0.166, 0.143, 0.146; PPL 0.140, 0.122, 0.139; PPW 0.184, 0.161, 0.159; CI 110, 107, 106; OI 27, 27, 27; SI 96, 96, 95; PTHI 76, 64, 66; PTWI 81, 79, 70; PPI 131, 132, 114; SPI 24, 25, 26; ACI 0.66.

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 convex; head about as long as wide, subcircular; antenna with terminal two segments enlarged to form a club; scapes with abundant long erect setae, longest setae longer than twice maximum width of scape; when scapes laid back from antennal insertions, they distinctly surpass margin of vertex; face smooth and shining; face covered with abundant long flexuous white to amber setae, most setae about 0.10mm long, a few twice as long on some specimens, no appressed pubescence; in face view abundant setae project from lateral and posterior margins.

Dorsal profile of mesosoma forming unbroken, shallowly convex surface from anterior pronotum to propodeal spines, then curving down to petiolar insertion; propodeal suture moderately impressed in dorsal view but obscured in profile due to lateral carinulae that bridge the suture; propodeum with short, weakly differentiated dorsal face and long posterior face; propodeal spines medium length, spiniform, posteriorly directed, weakly curving upward; pronotal dorsum with longitudinal carinulae and a few transverse carinulae anteriorly, producing incipient clathrate sculpture, interspaces smooth and shining; mesonotum with strong subparallel lateral carinae that extend across propodeal suture onto propodeum; medial mesonotum concave, smooth and shining; dorsal face of propodeum differentiated by weak to moderately developed punctate or punctatorugose sculpture; posterior face flat to concave, smooth and shining; side of pronotum smooth and shining; katepisternum and side of propodeum shining, largely smooth with traces of feeble microareolate sculpture and carinulae; mesosomal dorsum with flexuous white to amber setae, pair of humeral setae very long, to 0.26mm, pair of setae nearly as long on anterolateral mesonotum, other setae shorter, scattered over promesonotum and dorsal face of propodeum; tibiae with abundant long erect setae, of variable length, one or more tibial setae very long, much longer than maximum tibial width.

Petiole in side view trapezoidal, punctate, with acute anteroventral tooth; dorsal face of petiole smooth and shining, rectangular, longer than wide, with about four setae along posterior border; postpetiole with acute anteroventral tooth, postpetiole in dorsal view subquadrate and wider than long, with 6-8 erect setae; fourth abdominal tergite smooth and shining, with abundant long flexuous white to amber setae, no appressed pubescence.

Queen
A normal queen (dorsal face of propodeum drops steeply from postscutellum and much of propodeum appears ventral to scutellum and postscutellum) with general shape, sculpture, and pilosity characters of the worker; size characters as in Figures.

Type Material
Holotype worker. Venezuela, Est. Barinas, Ticoporo Forest Reserve, 240m, 8°04'N, 70°48'W, 26 Aug 1987 (Longino, collection code JTL1863), specimen code JTLC000001758. Paratypes. One worker, same data as holotype, specimen code JTLC000001380; one worker, same data , specimen code JTLC000001381; one worker, same data , specimen code JTLC000001382; one worker, same data , specimen code JTLC000001383; one worker, same data , specimen code JTLC000001384; one worker, same data , specimen code JTLC000001385; one worker, same data , specimen code JTLC000001386.

Etymology
This species is named for its yellow coloration and the presence of long sensory setae on the legs.

References based on Global Ant Biodiversity Informatics

 * Achury R., and A.V. Suarez. 2017. Richness and composition of ground-dwelling ants in tropical rainforest and surrounding landscapes in the Colombian Inter-Andean valley. Neotropical Entomology https://doi.org/10.1007/s13744-017-0565-4
 * Alonso L. E., J. Persaud, and A. Williams. 2016. Biodiversity assessment survey of the south Rupununi Savannah, Guyana. BAT Survey Report No.1, 306 pages.
 * Basset Y., L. Cizek, P. Cuenoud, R. K. Didham, F. Guilhaumon, O. Missa, V. Novotny, F. Odegaards, T. Roslin, J. Schmidl et al. 2012. Arthropod diversity in a tropical forest. Science 338(6113): 1481-1484.
 * Delabie J. H. C., R. Céréghino, S. Groc, A. Dejean, M. Gibernau, B. Corbara, and A. Dejean. 2009. Ants as biological indicators of Wayana Amerindian land use in French Guiana. Comptes Rendus Biologies 332(7): 673-684.
 * Fernandes I., and J. de Souza. 2018. Dataset of long-term monitoring of ground-dwelling ants (Hymenoptera: Formicidae) in the influence areas of a hydroelectric power plant on the Madeira River in the Amazon Basin. Biodiversity Data Journal 6: e24375.
 * Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
 * Fichaux M., B. Bechade, J. Donald, A. Weyna, J. H. C. Delabie, J. Murienne, C. Baraloto, and J. Orivel. 2019. Habitats shape taxonomic and functional composition of Neotropical ant assemblages. Oecologia 189(2): 501-513.
 * Franco W., N. Ladino, J. H. C. Delabie, A. Dejean, J. Orivel, M. Fichaux, S. Groc, M. Leponce, and R. M. Feitosa. 2019. First checklist of the ants (Hymenoptera: Formicidae) of French Guiana. Zootaxa 4674(5): 509-543.
 * Groc S., J. H. C. Delabie, F. Fernandez, M. Leponce, J. Orivel, R. Silvestre, Heraldo L. Vasconcelos, and A. Dejean. 2013. Leaf-litter ant communities (Hymenoptera: Formicidae) in a pristine Guianese rainforest: stable functional structure versus high species turnover. Myrmecological News 19: 43-51.
 * Longino, J.T. 2003. The Crematogaster (Hymenoptera, Formicidae, Myrmicinae) of Costa Rica. Zootaxa 151:1-150
 * Lopes M. C., G. P. A. Lamarre, C. Baraloto, P. V. A. Fine, A. Vincentini, and F. B. Baccaro. 2019. The Amazonas-trap: a new method for sampling plant-inhabiting arthropod communities in tropical forest understory. Entomologia Experimentalis et Applicata https://doi.org/10.1111/eea.12797
 * Miranda P. N., F. B. Baccaro, E. F. Morato, M. A. Oliveira. J. H. C. Delabie. 2017. Limited effects of low-intensity forest management on ant assemblages in southwestern Amazonian forests. Biodivers. Conserv. DOI 10.1007/s10531-017-1368-y
 * Souza J. L. P., C. A. R. Moura, A. Y. Harada, and E. Franklin. 2007. Diversity of species of the genera Crematogaster, Gnamptogenys and Pachycondyla, (Hymenoptera: Formicidae) and complementarity of sampling methods during the dry season in an ecological station in the Brazilian state of Pará. Acta Amazonica 37(4): 649-656.