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|Forel, 1903a PDF: 689 (w.q.); Borgmeier, 1937a: 129 (ergatoid m.); Kugler, 1984 PDF: 7 (m., ergatoid m.).|
Cardiocondyla wroughtonii is a small (~1.5 mm) nondescript, light-yellow to yellowish brown species with short antennal scapes and moderately sized propodeal spines, and without erect hairs on its mesosoma. The species is an accomplished tramp ant (Heinze et al., 2006)and has established populations across the world (Boer & Vierbergen, 2008; Rasplus et al., 2010; Seifert, 2003; Ward, 2007), but it is not considered a pest or known to adversely affect native ecosystems. The restriction of the two non-tramp ants in the C. wroughtonii-group to India and Borneo suggest the native range of C. wroughtonii to be Southeast Asia. Cardiocondyla wroughtonii is polydomous, polygynous, and often founds new colonies by nest splitting (Debout et al., 2007; Seifert, 2003). Typical colony sizes are less than 500 workers (King, 2004; Seifert, 2003). Unlike most of its congeners which nest in the soil, C. wroughtonii and its close relative C. obscurior nest in vegetation above the surface (Deyrup et al., 2000; Lupo & Galil, 1985; Seifert, 2003). The reproductive strategies and caste determination of the species has been extensively studied, especially with respect to ergatoid males (Cremer et al., 2008; Heinze & Delabie, 2005; Heinze & Hölldobler, 1993; Kinomura & Yamauchi, 1987; Schrempf et al., 2007; Stuart et al., 1987). Add your content here.
Native range. Old World tropics, likely SE Asia.
Introduced range. Worldwide including Australia, Brunei, Hawaii, India, Indonesia, Japan, Malaysia, Papua New Guinea, Philippines, Sri Lanka, Taiwan, Thailand, Tanzania, USA (Louisiana, Florida, Georgia (possibly C. obscurior)).
Cardiocondyla obscurior has commonly been misidentified as C. wroughtonii prior to Seifert’s (2003)revision, and many of the literature references to the latter in fact refer to the former (e.g. Heinze & Hölldobler, 1993; Kinomura & Yamauchi, 1987; Stuart et al., 1987; Terayama, 1999). However, the species can be difficult to tell apart, and a thorough review of specimens vouchered for these works is needed to determine the correct name of the study species. Seifert offered the following discussion on how to differentiate between the two species.
The best indication for a separate species identity is given by differences in morphometry, gastral pigmentation pattern, and selection of nest habitats. C. obscurior was reported to nest in cavities of bushes and trees 2–5 m above the ground level; it was found in dead twigs of trees such as Erythrina variegata (Okinawa), in dwarf coconuts (Brazil), galls of Acacia trees (Brazil), in a dead twig on a tree (Florida), on a Ficus tree (Israel), in the gall of a Tamarix bush (Israel), and in the cavity of a coconut high in the tree (Zanzibar). C. wroughtonii, in contrast, was reported to nest near to or on the ground; it was found in hollow stems of dead Eulalia grasses (Okinawa), in a dead twig on the ground (New Orleans/USA), between layers of Eugenia jambolana leaves (India), in litter (Sulawesi), and "under leaves in a silk patch" (Tanzania). The workers of C. obscurior differ from C. wroughtonii by darker gaster pigmentation, shorter head, smaller postocular distance, narrower frons, wider and higher waist segments, wider spine base distance, and shorter spine length.
Among introduced Cardiocondyla species, C. wroughtonii (together with C. emeryi and C. obscurior) is differentiated by (1) a distinctly impressed metanotal groove, (2) relatively long propodeal spines, and (3) a postpetiole that is as high as the petiole and possessing a distinct ventral bulge. It is distinguished from C. emeryi by the postpetiole, which in dorsal view has sharply angled (versus gently rounded in C. emeryi) anterolateral corners. Seifert (2003)notes that C. obscurior can often be differentiated from C. wroughtonii by the more bicolored appearance caused by its darker gaster pigmentation, shorter head, smaller postocular distance, narrower frons, wider and higher waist segments, wider spine base distance, and shorter spine length.
Diagnosis among workers of introduced and commonly intercepted ants in the United States. Worker caste monomorphic. Head shape subrectangular. Antenna 12-segmented. Antennal club 3-segmented. Antennal scapes easily extended beyond eye level but scapes do not extend beyond posterior margin of head. Antennal scrobe lacking. Antennal insertion not surrounded by a raised sharp-edged ridge. Eyes greater than 5 facets; not unusually large (distinctly less than half head length). Posterolateral corners of head unarmed, without spines. Mandibles triangular. Mesosoma lacking erect hairs. Metanotal groove distinctly impressed. Pronotal spines absent. Propodeal spines relatively long (more developed than small angles). Slope of mesosoma gradual. Waist 2-segmented. Petiole with a distinct and upright node; lacking large subpetiolar process. Petiolar peduncle not appearing long (length not twice height); thickens gradually as it tapers into node. Postpetiole appearing swollen, in dorsal view wider than long and much broader than petiole; attached to lower surface of gaster. Postpetiole as high as petiole and with a distinct ventral bulge, postpetiole in dorsal view with sharp anterolateral corners. Color polymorphism. Light morph (common): whole ant entirely light-yellowish except for diffuse brown band in posterior half of 1sl gaster tergite; this band may be interrupted medially, being reduced to lateral patches. Dark morph (rare): Head, mesosoma, waist, and appendages light-yellowish brown; funicular club blackish brown; first gastral tergite and sternite dark brown, following segments substantially brighter.
Boer, P. & Vierbergen, B. (2008) Exotic ants in The Netherlands (Hymenoptera: Formicidae). Entomol. Ber. (Amsterdam), 68, 121-129.
Dash, S.T. & Hooper-Bùi, L.M. (2008) Species diversity of ants (Hymenoptera: Formicidae) in Louisiana. Ann. Entomol. Soc. Am., 101, 1056-1066.
Debout, G., Schatz, B., Elias, M. & Mckey, D. (2007) Polydomy in ants: what we know, what we think we know, and what remains to be done. Biol. J. Linn. Soc., 90, 319-348.
Deyrup, M., Davis, L. & Cover, S. (2000) Exotic ants in Florida. Trans. Am. Entomol. Soc., 126, 293-326.
Heinze, J. & Hölldobler, B. (1993) Fighting for a harem of queens: physiology of reproduction in Cardiocondyla male ants. Proc. Natl. Acad. Sci. U.S.A., 90, 8412-8414.
Kinomura, K. & Yamauchi, K. (1987) Fighting and mating behaviors of dimorphic males in the ant Cardiocondyla wroughtoni. J. Ethol., 5, 75-81.
Lupo, A. & Galil, J. (1985) Nesting habits of Cardiocondyla wroughtoni Forel (1890) (Hymenoptera: Formicidae). Isr. J. Entomol., 19, 119-125.
Rasplus, J.Y., Villemant, C., Paiva, M.R., Delvare, G. & Roques, A. (2010) Hymenoptera. BioRisk, 4(2), 669-776.
Seifert, B. (2003) The ant genus Cardiocondyla (Insecta: Hymenoptera: Formicidae) - A taxonomic revision of the C. elegans, C. bulgarica, C. batessi, C. nuda, C. shuckardi, C. stambuloffi, C. wroughtoni, C. emeryi, and C. minutior species groups. Ann. Naturhist. Mus. Wien Ser. B. Bot. Zool., 104, 203-338.
Stuart, R.J., Francoeur, A. & Loiselle, R. (1987) Lethal fighting among dimorphic males of the ant, Cardiocondyla wroughtonii. Naturwissenschaften, 74, 548-549.
Terayama, M. (1999) Taxonomic studies of the Japanese Formicidae, Part 6. Genus Cardiocondyla Emery. Mem. Myrmecol. Soc. Jpn., 1, 99-107.
Ward, D.F. (2007) The distribution and ecology of invasive ant species in the Pacific Region. PhD thesis, in Biological Sciences, The University of Auckland, xiii + 173 p.
Found most commonly in these habitats: 8 times found in rainforest, 5 times found in rain forest, 8 times found in Port of entry, 3 times found in spiny forest, 3 times found in urban garden, 3 times found in urban/garden, 2 times found in gallery forest, 3 times found in Botanical garden rubber plantation, 3 times found in dry forest, 2 times found in Rubber plantation, ...
Collected most commonly using these methods or in the following microhabitats: 7 times Malaise trap, 5 times Random coll. Winkler sifting, 3 times Berlesate, 8 times m2 Winkler sifting, 5 times Malaise, 1 times 2 Maxi Winks, 2 times beating, 2 times beating low vegetation, 1 times Malaise trap, 5 traps, 1 times 9 MaxiWinks, mixed samples, 1 times search, ...
Elevations: collected from 10 - 1750 meters, 338 meters average
Type specimens: syntype of Cardiocondyla wroughtonii: casent0901753, casent0908349, casent0908350; syntype of Cardiocondyla wroughtonii hawaiensis: casent0908351; syntype of Cardiocondyla wroughtonii quadraticeps: casent0908352