Harpagoxenus sublaevis

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Harpagoxenus sublaevis
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Harpagoxenus
Species: H. sublaevis
Binomial name
Harpagoxenus sublaevis
(Nylander, 1849)

Harpagoxenus sublaevis casent0178588 profile 1.jpg

Harpagoxenus sublaevis casent0178588 dorsal 1.jpg

Specimen labels

Subspecies
Synonyms

This species is a slave-maker. In Russia (Zryanin & Zryanina, 2007) it is associated with Leptothorax acervorum and Leptothorax muscorum in boreal regions. It is also known to enslave Leptothorax gredleri (Guillem et al., 2014).

At a Glance • Slave-maker  • Ergatoid queen  

 

Identification

Pale yellowish brown to brown; head large, rectangular, with weakly concave occiput. Frontal carinae extend backward to enclose whole length of antennal scape. Antennae 11 segmented with intermediate segments strongly transverse and enlarged 4 segmented club. Eyes large, set midway at sides of head. Mesopropodeal furrow deep and distinct; propodeal spines broad and short. Femora and tibiae short and broadly rounded. Head and mesopropodeum longitudinally striate, petiole nodes and gaster smooth and shining. Whole body and appendages covered with long, acute, pale hairs. Length: 3.5-5.5 mm (Collingwood 1979).

Distribution

Pyrenees to Caucasus; northern Italy to northern Norway (Collingwood 1979); China (Xu, 2012).

Distribution based on Regional Taxon Lists

Palaearctic Region: Austria, Belarus, Belgium, Bulgaria, China, Czech Republic, Denmark, Estonia, Finland (type locality), France, Germany, Hungary, Iberian Peninsula, Italy, Lithuania, Netherlands, Norway, Poland, Romania, Russian Federation, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, Ukraine.


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Workers are unable to forage outside the nest and are not capable of brood tending or feeding themselves. Host species workers (slaves) are needed for the continuation of the colony. In mixed colonies no host queen can survive, though unmated gynes of the host species frequently develop from raided pupae. They dealate and serve as slaves. Host brood is commonly not devoured. During raids, host species eggs are even discarded outside the host nest and are not carried to the slavemaker nest.

Harpagoxenus sublaevis is a species with queen polymorphism. Most functional queens are wingless ergatoid queens that usually look like large workers; alate queens are very rare and seem absent in northern parts of the range. A genetical mechanism is claimed to underlie this queen polymorphism.

Collingwood (1979) - In Denmark and Fennoscandia nests containing host species and inquiline are commonly found in twigs on the ground, tree stumps or under bark but in the mountains of Central Europe they occur rarely under stones.

Guillem et al., 2014 - H. sublaevis is a slave-maker, invading Leptothorax host colonies, killing the queen and enslaving the host workers. Since the parasite workers are not adapted to forage, killing the host queen means that the parasite workers need to raid neighbouring host colonies to replenish the slaves. Harpagoxenus sublaevis co-exists with three species of Leptothorax, Leptothorax acervorum, Leptothorax muscorum and Leptothorax gredleri, although the former is the most commonly recorded host. Colonies can also consist of mixed Leptothorax spp. slaves (Bauer et al., 2010).

Three colonies of Harpagoxenus sublaevis were found by breaking open dry pine twigs that contained Leptothorax acervorum workers and queens on the Hanko peninsular in Southern Finland during September 2012. Roughly every one in 15 colonies of L. acervorum found was parasitized.

Guillem et al. (2014) examined cuticular hydrocarbon (CHC) profiles between this parasite and its hosts. They found that the parasitic species had CHC profiles that were indistinguishable from that of their hosts. The level of chemical mimicry even extended to the more subtle between-colony differences in profiles. In all cases the profiles of un-parasitized colonies were similar to those that were parasitized indicating that it is the parasites that have adjusted their profile to match that of their host and not vice versa. This explains why these social parasites are fully integrated members of each colony and are treated as nest-mates. It also helps to explain why raiding parties of Harpagoxenus workers are frequently killed or driven off when trying to raid or invade new host L. acervorum colonies (Winter and Buschinger, 1986), since they are carrying their own host colony odour, which is likely to be different from that of the one they are raiding. This is why parasites continue to use a wide range of other chemical and morphological adaptations associated with their parasitic lifestyle. These include a thickened cuticle and production of appeasement or propaganda compounds (e.g. Allies et al., 1986; Lloyd et al., 1986; Ollett et al., 1987; D'Ettorre et al., 2000). These tactics allow the parasite time to make the necessary adjustments to its profile. Acquiring a host profile may be possible in just a few hours (R. Kather, pers. comm., cited in Guillem et al. (2014)).

Castes

Worker

Male

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • hirtula. Myrmica hirtula Nylander, 1849: 45 (w.) FINLAND. Combination in Harpagoxenus: Emery, 1924d: 266. Junior synonym of sublaevis: Mayr, 1861: 56; Dalla Torre, 1893: 64. Revived from synonymy as subspecies of sublaevis: Emery, 1924d: 266; Stitz, 1939: 154. Junior synonym of sublaevis: Radchenko, 2007: 32.
  • sublaevis. Myrmica sublaevis Nylander, 1849: 33 (w.) FINLAND. Adlerz, 1896: 62 (q.m.); Viehmeyer, 1906: 58 (q.m.); Wheeler, G.C. & Wheeler, J. 1955b: 27 (l.). Combination in Tomognathus: Mayr, 1861: 56; in Harpagoxenus: Forel, 1893a: 167. Senior synonym of hirtula: Radchenko, 2007: 32. See also: Stitz, 1939: 151; Kutter, 1977c: 146; Buschinger, 1981: 211. Current subspecies: nominal plus caucasicus.

Description

Karyotype

  • n = 20, 2n = 40 (Switzerland) (Buschinger et al., 1980; Hauschteck-Jungen & Jungen, 1983; Fischer, 1987).

References

  • Adlerz, G. 1896. Myrmekologiska Studier. 3. Tomognathus sublaevis Mayr. Bihang till Kongl. Svenska Vetenskaps-Akademiens Handlingar 21 (4): 1-76. [1896.] PDF (page 62, queen, male described)
  • Allies, A.B., Bourke, A.F.G., Franks, N.R. 2986. Propaganda substances in the cuckoo ant Leptothorax kutteri and the slave-maker Harpagoxenus sublaevis. Journal of Chemical Ecology 12: 1285-1293 (doi:10.1007/BF01012348).
  • Bauer, S., Bohm, M., Witte, V., Foitzik, S. 2010. An ant social parasite in-between two chemical disparate host species. Evolutionary Ecology 24: 317-332 (doi:10.1007/s10682-009-9308-2).
  • Brandt, M., Heinze, J., Schmitt, T., Foitzik, S. 2005. A chemical level in the coevolutionary arms race between an ant social parasite and its host. Journal of Evolutionary Biology 18: 576–586 (doi:10.1111/j.1420-9101.2004.00867.x).
  • Buschinger, A. 1966: Untersuchungen an Harpagoxenus sublaevis NYL. (Hym., Formicidae). I.- Freilandbeobachtungen zu Verbreitung und Lebensweise. Ins. Soc. 13, 5-16.
  • Buschinger, A. 1966: Untersuchungen an Harpagoxenus sublaevis NYL. Hymenoptera, Formicidae). II. Haltung und Brutaufzucht. Ins. Soc. 13, 311-322, 1966.
  • Buschinger, A. 1968: Untersuchungen an Harpagoxenus sublaevis NYL.(Hymenoptera, Formicidae). III. - Kopula, Koloniegründung, Raubzüge. Ins. Soc. 15, 89-104, 1968.
  • Buschinger, A. 1968: “Locksterzeln” begattungsbereiter ergatoider Weibchen von Harpagoxenus sublaevis NYL. (Hymenoptera, Formicidae). Experientia 24, 297.
  • Buschinger, A. 1971: Weitere Untersuchungen zum Begattungsverhalten sozialparasitischer Ameisen (Harpagoxenus sublaevis NYL. und Doronomyrmex pacis KUTTER (Hym., Formicidae)). Zool. Anz. 187, 184-198.
  • Buschinger, A. 1972: Giftdrüsensekret als Sexualpheromon bei der Ameise Harpagoxenus sublaevis. Die Naturwissenschaften 59, 313-314.
  • Buschinger, A. 1974: Experimente und Beobachtungen zur Gründung und Entwicklung neuer Sozietäten der sklavenhaltenden Ameise Harpagoxenus sublaevis (NYL). Ins. Soc. 21, 381-406.
  • Buschinger, A. 1975: Eine genetische Komponente im Polymorphismus der dulotischen Ameise Harpagoxenus sublaevis. Die Naturwissenschaften 62, 239.
  • Buschinger, A. 1978: Genetisch bedingte Entstehung geflügelter Weibchen bei der sklavenhaltenden Ameise Harpagoxenus sublaevis (NYL.) (Hym., Form). Ins. Soc. 25, 163-172.
  • Buschinger, A. 1983: Sexual behaviour and slave raiding of the dulotic ant, Harpagoxenus sublaevis (NYL.) under field conditions (Hym., Formicidae). Ins. Soc. 30, 235-240.
  • Buschinger, A., Frenz, G., Wunderlich, M. 1975: Untersuchungen zur Geschlechtstierproduktion der dulotischen Ameise Harpagoxenus sublaevis (NYL.) (Hym., Formicidae). Ins. Soc. 22, 169-182.
  • Buschinger, A., Winter, U. 1975: Der Polymorphismus der sklavenhaltenden Ameise Harpagoxenus sublaevis (NYL.). Ins. Soc. 22, 333-362.
  • Buschinger, A., Winter, U. 1977: Rekrutierung von Nestgenossen mittels Tandemlaufen bei Sklavenraubzügen der dulotischen Ameise Harpagoxenus sublaevis (NYL.). Ins. Soc. 24, 183-190.
  • Buschinger, A., Winter, U. 1978: Echte Arbeiterinnen, fertile Arbeiterinnen und sterile Wirtsweibchen in Völkern der dulotischen Ameise Harpagoxenus sublaevis (NYL.) (Hym., Form.). Ins. Soc. 25, 63-78.
  • Buschinger, A. 1981. Biological and systematic relationships of social parasitic Leptothoracini from Europe and North America. Pp. 211-222 in: Howse, P. E., Clement, J.-L. (eds.) Biosystematics of social insects. Systematics Association Special Volume N (page 211, see also)
  • Collingwood, C. A. 1979. The Formicidae (Hymenoptera) of Fennoscandia and Denmark. Fauna Entomol. Scand. 8:1-174.
  • Czechowski, W.; Czechowska, W. 1999a. New sites in Poland and notes on the biology of socially parasitic ants Formicoxenus nitidulus (Nyl.) and Harpagoxenus sublaevis (Nyl.) (Hymenoptera, Formicidae). Fragm. Faun. (Warsaw) 42: 1-6 (page 1, record in Poland)
  • Forel, A. 1893b. Sur la classification de la famille des Formicides, avec remarques synonymiques. Ann. Soc. Entomol. Belg. 37: 161-167 (page 167, Combination in Harpagoxenus)
  • Guillem, R.M., Drijfhout, F., & Martin, S.J. 2014. Chemical deception among ant social parasites. Current Zoology, 60(1), 62-75 (doi:10.1093/czoolo/60.1.62).
  • Kaib, K., Heinze, J., Ortius, D. 1993. Cuticular hydrocarbon profiles in the slave-making ant Harpagoxenus sublaevis and its hosts. Naturwissenschaften 80: 281–285 (doi:10.1007/BF01135915).
  • Heinze, J., Ortius, D., Hölldobler, B., Kaib, M. 1994. Intracolonial discrimination among heterospecific slaves of the ant Harpagoxenus sublaevis. Behavioral Ecology and Sociobiology 35: 75–83 (doi:10.1007/BF00171496).
  • Kutter, H. 1977c. Hymenoptera, Formicidae. Insecta Helv. Fauna 6: 1-298 (page 146, see also)
  • Mayr, G. 1861. Die europäischen Formiciden. Nach der analytischen Methode bearbeitet. Wien: C. Gerolds Sohn, 80 pp. (page 56, Combination in Tomognathus)
  • Nylander, W. 1849 [1848]. Additamentum alterum adnotationum in monographiam formicarum borealium. Acta Soc. Sci. Fenn. 3: 25-48 (page 33, worker described)
  • Schumann, R., Buschinger, A. 1991: Selective acceptance of alien host species pupae by slaves of the dulotic ant, Harpagoxenus sublaevis (Hymenoptera, Formicidae, Myrmicinae). Ethology 88, 154-162.
  • Stitz, H. 1939. Die Tierwelt Deutschlands und der angrenzenden Meersteile nach ihren Merkmalen und nach ihrer Lebensweise. 37. Theil. Hautflüger oder Hymenoptera. I: Ameisen oder Formicidae. Jena: G. Fischer, 428 pp. (page 151, see also)
  • Viehmeyer, H. 1906. Beiträge zur Ameisenfauna des Königreiches Sachsen. Sitzungsber. Abh. Naturwiss. Ges. "Isis" Dres. 1906: 55-69 (page 58, queen, male described)
  • Wheeler, G. C.; Wheeler, J. 1955b. The ant larvae of the myrmicine tribe Leptothoracini. Ann. Entomol. Soc. Am. 48: 17-29 (page 27, larva described)
  • Winter, U., Buschinger, A. 1986: Genetically mediated queen polymorphism and caste determination in the slave-making ant, Harpagoxenus sublaevis (Hymenoptera: Formicidae). Entomol. Gener. 11, 125-137.
  • Xu, Z.-H. 2012a. A newly recorded genus and species, Harpagoxenus sublaevis, from China with a key to the known species of Harpagoxenus of the world (Hymenoptera: Formicidae). Sociobiology 59:19-25. PDF
  • Zryanin, V.A. and Zryanina, T.A. 2007. Novye dannye o faune murav’ev Srednego Povolzh’ya. Uspekhi Sovremennoj Biologii. 127:226-240. [in Russian]