| Cardiocondyla nuda|
Once thought to be a cosmopolitan tramp species, revisionary work has shown the range of this species is restricted to the tropical and subtropical Pacific region.
|At a Glance||• Polygynous|
- 1 Identification
- 2 Distribution
- 3 Biology
- 4 Castes
- 5 Nomenclature
- 6 References
A member of the Cardiocondyla nuda group.
Keys including this Species
- Key to Australian Cardiocondyla Species
- Key to Holartic Cardiocondyla
- Key to Micronesian Ants
- Key to Myrmicinae genera of the southwestern Australian Botanical Province
In Australia it is primarily found along the eastern and northern coastal regions, in Polynesia east to 170 W, and in New Guinea (Seifert 2008).
Distribution based on Regional Taxon Lists
Australasian Region: Australia.
Indo-Australian Region: Fiji (type locality), Micronesia (Federated States of), New Guinea, Samoa, Solomon Islands, Tonga, Vanuatu, Wallis and Futuna Islands.
Neotropical Region: Puerto Rico.
Check distribution from AntMaps.
Distribution based on specimens
In Australia this species is found in a range of habitats from natural to urban, and from coastal dunes and grasslands to rainforest. It prefers areas with annual rainfall > 1000 mm.
Little is known about Cardiocondyla nuda. Until further studies reveal more about this species we can infer that its natural history and biology is likely similar to other members of the genus. Seifert revised the holarctic species of Cardiocondyla in 2003 and the following synopsis is based on his excellent treatment of the genus. References to other publications and more details about what is reported here can be found in Seifert (2003).
Many Cardiocondyla species inhabit areas that experience frequent disturbance and/or are quite open. These may be human altered areas, where a number of Cardiocondyla tramp species thrive, but also natural areas such as semi deserts and steppes, immature soils at rivers, lakes, and sea shores and to a lesser extent forest margins or burned-down woodland patches. In contrast to this open-land group, the natural habitat affinities of many tropical species are primary rain forests.
Nests are typically in soil and sometimes under stones. Two species are known to nest in vegetation but this is unusual for the genus. The single nest entrances is small (1-1.5 mm) and inconspicuous. In the desert nests can be relatively deep (> 1m) and have many chambers but in areas where conditions are less extreme there is generally a single chamber (15-20 mm diameter and 3-4 mm height) that is not far below the ground surface (2-15 cm).
Cardiocondyla tramp species (Cardiocondyla wroughtonii, Cardiocondyla obscurior, Cardiocondyla mauritanica, Cardiocondyla emeryi and Cardiocondyla minutior) are known to be polygynous, as are some less widespread species, while other species are known to be monogynous.
Cardiocondyla ants are omnivorous. Zoophagy (zoo necrophagy and killing of small weakly sclerotised arthropods), granivory, and nectarivory have also been noted. Tandem running has been observed as a method of recruitment to food sources in a few species.
Intranidal mating appears to be the norm for most species in the genus. Mating strategies are species dependent and may take various forms. Winged males may mate within their nest or fly to and enter other colonies to mate. Queen mate intranidally and fly from their nest to begin a new colony, become integrated into their natal colony, or may walk away from their nest and establish a new colony nearby.
Cardiocondyla are unusual in having peculiar male forms. Male polymorphism is found in some species with typical males and an ergatoid form. These latter males are wingless and worker like in appearance. Ergatoid males fight with other males within their natal nest. By killing potential rival males, a dominant male can monopolize matings with the virgin queens in their colony. Morphological modifications that enhance the fighting abilities of ergatoid males have been documented, e.g., modified mandibles well suited to fighting and increased mesosomal size for better protection against attacks from rivals. Another unusual characteristic of ergatoid males is the continuation of spermatogenesis throughout their adult life. Males of most aculeate hymenoptera stop producing sperm once they are fully mature.
Some species are known to produce different queen morphs. This presumably facilitates there being a longer range dispersal queen form and a shorter or non-dispersing form. Gyne polymorphism appears to be an adaptation for species inhabiting continental desert or semi-desert habitats. The cosmopolitan tramp species, on the other hand, do not exhibit this gyne polymorphism.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- nuda. Leptothorax nudus Mayr, 1866a: 508 (w.) FIJI IS. Emery, 1897c: 588 (q. ergatoid m.); Wheeler, G.C. & Wheeler, J. 1973a: 27 (l.); Imai, et al. 1984: 6 (k.). Combination in Cardiocondyla: Forel, 1881: 6. Current subspecies: nominal plus sculptinodis. See also: Seifert, 2003a: 245.
- Leptothorax nudus: Lectotype (designated by Seifert, 2003), Ovalau, Viti, Fiji, Godeffroy, "2768 ov", Naturhistorisches Museum Wien, Vienna.
Seifert (2003) - In agreement with the type localities given in Mayr's description the type specimen from Ovalau / Fijis was designated as lectotype. Because of misidentifications, C. nuda has been erroneously termed in the past as cosmopolitan tramp species. Instead, it seems to be restricted to the tropical and subtropical Pacific region. Investigation of authentic material showed that Palaearctic "C. nuda" (sensu PISARSKI 1967, BOLTON 1982, HEINZE & al.1993) turned out to be Cardiocondyla mauritanica while Japanese-Pacific "C. nuda" (TERAYAMA & al. 1992, TERAYAMA 1999) were Cardiocondyla kagutsuchi. Cosmopolitan C. mauritanica and Indomalayan-West Pacific C. kagutsuchi differ from Australasian-Polynesian C. nuda in particular by the wider head, the smaller postocular index, the shorter spines, the lower waist segments, and the larger ratio PEH/PPH. Furthermore, the microreticulum on lateral mesosoma and petiole is less deeply sculptured than in C. nuda, in which it is relatively coarse, giving a perfectly dull surface impression at magnifications < 60x.
Subsequently, Seifert (2008) published revisionary work that separated C. nuda from C. atalanta.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Seifert (2003) - Small size, CS 468. Head elongated, CL/CW 1.224. Postocular head parallel-sided and very long, PoOc/CL 0.469. Scape of medium length, SL/CW 0.802. Occipital margin straight or slightly concave. Frontal laminae converging immediately caudal of FRS level, FL/FR in lectotype 1.095. Eyes relatively small, EYE 0.233. Foveolae on vertex in dense honey-comb arrangement, deeply impressed, with 17 - 20 µm diameter, and usually with inner corona. Frontal laminae and clypeus with few longitudinal rugulae. Whole mesosoma and lateral petiole with strong microreticulum having mesh diameters of 5 - 13 µm (smallest on petiole sides). Metanotal groove more or less shallow. Spines longer and more erect than in Cardiocondyla mauritanica and rather acute. Postpetiole in dorsal view usually with angulate-convex sides and roughly hexagonal; sides sometimes simply convex, without angular component; bulging postpetiolar sternite resulting in large PPH that is frequently larger than PEH, PEH/PPH 1.009 ± 0.026 [0.964, 1.060]. Surface of first gaster tergite shining and with very delicate microreticulum. Whole head and mesosoma of type specimen concolorous dark brown, gaster blackish brown. Lighter specimens with yellowish brown mesosomas and medium brown heads frequently occur throughout the Pacific region. For morphometric data of 34 workers see Tab. 9.
Seifert (2003) - Rather small, CS 521. Head much elongated, CL/CW 1.203. Postocular head parallel-sided and very long, PoOc/CL 0.458. Occipital margin straight or slightly concave. Foveolae on vertex in dense honey-comb arrangement, deeply impressed, with 19 -20 µm diameter, and with inner corona. Frontal laminae, clypeus, and small median stripe on vertex longitudinally carinulate-rugulose. Whole mesosoma and lateral petiole with very strong reticulum (or foveolate without interspaces). Spines short but acute. Postpetiole relatively narrow, dorsal aspect with concave anterior margin and angulate-convex sides, only slightly lower than petiole, PEH/PPH 1.061 ± 0.022 [1.028, 1.096]. Whole body concolorous dark brown. For morphometric data of 10 gynes see Tab. 17.
Emery, (1897c) described the ergatoid male.
- Creighton, W. S.; Snelling, R. R. 1974. Notes on the behavior of three species of Cardiocondyla in the United States (Hymenoptera: Formicidae). Journal of the New York Entomological Society 82:82-92. PDF
- Emery, C. 1897c. Formicidarum species novae vel minus cognitae in collectione Musaei Nationalis Hungarici quas in Nova-Guinea, colonia germanica, collegit L. Biró. Természetr. Füz. 20: 571-599 PDF (page 588, queen, ergatoid male described)
- Forel, A. 1881. Die Ameisen der Antille St. Thomas. Mitt. Münch. Entomol. Ver. 5: 1-16 (page 6, Combination in Cardiocondyla)
- Imai, H. T.; Baroni Urbani, C.; Kubota, M.; Sharma, G. P.; Narasimhanna, M. H.; Das, B. C.; 1984. Karyological survey of Indian ants. Jpn. J. Genet. 59: 1-32 (page 6, karyotype described)
- Mayr, G. 1866a. Myrmecologische Beiträge. Sitzungsber. Kais. Akad. Wiss. Wien Math.-Naturwiss. Cl. Abt. I 53: 484-517 (page 508, worker described)
- Radchenko, A. G. 1995g. Palearctic ants of the genus Cardiocondyla (Hymenoptera, Formicidae). Entomol. Obozr. 74: 447-455 (page 452, Senior synonym of britteni)
- Seifert, B. 2003a. The ant genus Cardiocondyla (Insecta: Hymenoptera: Formicidae) - a taxonomic revision of the C. elegans, C. bulgarica, C. batesii, C. nuda, C. shuckardi, C. stambuloffii, C. wroughtonii, C. emeryi, and C. minutior species groups. Annalen des Naturhistorischen Museums in Wien. 104B:203-338.
- Seifert, B. 2008. Cardiocondyla atalanta FOREL, 1915, a cryptic sister species of Cardiocondyla nuda (MAYR, 1866) (Hymenoptera: Formicidae). Myrmecological News. 11:43-48.
- Seifert, B., Okita, I., Heinze, J. 2017. A taxonomic revision of the Cardiocondyla nuda group (Hymenoptera: Formicidae). Zootaxa 4290: 324–356 (DOI: 10.11646/zootaxa.4290.2.4).
- Taylor, R. W. 1991b. Nomenclature and distribution of some Australasian ants of the Myrmicinae (Hymenoptera: Formicidae). Mem. Qld. Mus. 30: 599-614 (page 601, Senior synonym of atalanta)
- Wheeler, G. C.; Wheeler, J. 1973a. The ant larvae of six tribes: second supplement (Hymenoptera: Formicidae: Myrmicinae). J. Ga. Entomol. Soc. 8: 27-39 (page 27, larva described)
- Wilson, E. O.; Taylor, R. W. 1967b. The ants of Polynesia (Hymenoptera: Formicidae). Pac. Insects Monogr. 14: 1-109 (page 55, Senior synonym of minutior)