(Species Checklist, Species by Country)
|Based on Borowiec (2019).|
Aenictus occurs throughout Africa and in tropical and subtropical areas from India east through southern China to Taiwan and south to Australia with outlier, temperate-climate species or populations in Japan, Afghanistan, Armenia and south-central Australia (Bolton et al., 2006; Gotwald, 1995; Shattuck, 1999, 2008). While widespread, nowhere are they common. It contains 224 valid species and subspecies. The phylogenetic relationship of Aenictus to other ants has been investigated by Bolton (1990), Baroni Urbani et al. (1992), Brady (2003), Brady and Ward (2005), Brady et al. (2006), Moreau et al. (2006) and Brady et al. (2014).
|At a Glance||• Ergatoid queen|
- 1 Photo Gallery
- 2 Identification
- 3 Distribution
- 4 Biology
- 5 Castes
- 6 Morphology
- 7 Nomenclature
- 8 References
Borowiec (2016) - Worker The workers of Aenictus be recognized by a combination of 8 to 10-segmented antennae, propodeal spiracle positioned high on the propodeum, and conspicuously binodal waist (abdominal segment IV is conspicuously the largest abdominal segment). Aenictus is most similar to the New World genus Neivamyrmex, which can be distinguished by 12-segmented antennae. Two other army ant genera co-occur with Aenictus: Aenictogiton and Dorylus. In Aenictogiton there are also constrictions between abdominal segments IV–VI, absent from Aenictus. Dorylus has a uninodal waist with no tapering towards the anterior of abdominal segment IV.
Male The males of Aenictus are of decidedly army ant-like habitus and distinguishable from other dorylines by a combination of single segment in the waist, femora never extremely flattened relative to tibia, M·f1 vein of fore wing situated distal or near to cu-a, Rs·f2–3 absent, pterostigma broad and conspicuous. All New World army ant genera with similar habitus can be distinguished by fore wing venation, in particular presence of Rs·f2–3 and marginal cell closed along the leading edge by R·f3 connected to Rs·f5. In the Old World, Aenictogiton males can be easily told apart by their ‘hanging’ Rs·f2–3 vein in the fore wing, while Dorylus have a narrow pterostigma and dramatically flattened femora that contrast with tibiae that are more circular in cross-section.
Jaitrong and co-authors have been revising Aenictus species groups, based on worker morphology, and this is a great help when working through species determinations.
|See images of species within this genus|
Keys including this Genus
- Key to Australian Genera of Dorylinae
- Key to Dorylinae World Genera
- Key to Vietnamese Dorylinae Genera
Keys to Subgenera or Species Groups in this Genus
Keys to Species in this Genus
- Key to Australian Aenictus Species
- Key to Aenictus wroughtonii group species
- Key to Aenictus javanus group species
- Key to Aenictus phillippinensis group species
- Key to Aenictus pachyerus group species
- Key to Aenictus currax group species
- Key to Aenictus laeviceps group species
- Key to Aenictus minutulus group species
- Key to Aenictus silvestrii group species
- Key to southeastern Asian Aenictus ceylonicus group species
- Key to Aenictus of Laos
- Key to Aenictus of India
- Key to Aenictus ceylonicus group species of China
- Key to the Afrotropical Aenictus
A summary of the described Afrotropical species by caste can be found here: Afrotropical Aenictus by caste
Aenictus is widely distributed in the Old World. The vast majority of species are found in Southeast Asia, with the Afrotropics being the other center of diversity. A few species range into the southern parts of the Palearctic region, and there is a number of species known from Australia. (Borowiec 2016)
Distribution and Richness based on AntMaps
Species by Region
Number of species within biogeographic regions, along with the total number of species for each region.
|Afrotropical Region||Australasian Region||Indo-Australian Region||Malagasy Region||Nearctic Region||Neotropical Region||Oriental Region||Palaearctic Region|
Fossils are known from: Zhangpu amber, Zhangpu County, Fujian Province, China (Miocene) (an unidentified species, Wang et al., 2021).
All known species are "army ants" and conduct raids using large numbers of workers, primarily attacking other ants, social wasps and termites. While there are reports of these ants preying on other insects and even collecting honeydew from homopterans (Santschi, 1933; Gotwald, 1995), these habits appear to be uncommon.
Foraging raids undertaken by these ants occur both day and night, usually across the ground surface but occasionally also arboreally. During raids, numerous workers attack a single nest or small area, with several workers coordinating their efforts to carry large prey items back to the nest or bivouac.
Aenictus have a nomadic life style, alternating between a migratory phase in which nests are temporary bivouacs in sheltered places above the ground and a stationary phase where semi-permanent underground nests are formed. During the nomadic phase bivouacs move regularly, sometimes more than once a day when larvae require large amounts of food. Individual nests usually contain up to several thousand workers, although nest fragments containing only a few hundred workers are often encountered.
Borowiec (2016) - This Old World lineage contains some of the more conspicuous army ants and is the largest doryline genus.
Given the number of described species and their abundance and importance as insect predators in the Old World tropics, the biology of Aenictus is poorly studied. The impressive species and morphological diversity is likely reflected in the diversity of habits, although all thus far observed species seem to be specialized predators of other ants (but see Staab 2014b for a report on honeydew feeding). Members of some groups are known to form colonies of up to 80,000 individuals, forage above-ground in conspicuous columns and bivouac in semi-open spaces, while others are much more inconspicuous and cryptic. Aenictus queens synchronize brood production and colony life cycle goes through statary and nomadic phases (Schneirla and Reyes 1966). The nomadic phase lasts on average 14 days, about the same amount of time as in the Neotropical genera, but the statary phase is much longer and lasts 28 days, as opposed to 20 days in Eciton. During the nomadic phase in Eciton the daily colony emigrations always follow raids, whereas in Aenictus they can be initiated after a time of quiescence and occur without regularity, often multiple times a day. The descriptions of foraging behavior for several species are available; Wilson (1964) in his revision provides notes on foraging of selected species. Chapman (1965) recounts observations of a few species in the Philippines, mostly Aenictus gracilis and Aenictus laeviceps, and Schneirla and Reyes (1966, 1969) study these two epigaeic species in detail. Schneirla (1971) compares raiding and emigration behavior of Aenictus laeviceps to other army ants, Eciton and Neivamyrmex.
Rościszewski and Maschwitz (1994) and Hirosawa et al. (2000) studied prey specialization among sympatric Aenictus in Asia. Both studies found evidence of resource partitioning and observed differences in foraging strategies. Gotwald and Cunningham-van Someren (1976) and Gotwald (1976) are the only publications focusing on the behavior of African forms. At least some species support a community of myrmecophiles (Chapman 1965, Maruyama et al. 2009).
Billen and Gotwald (1988) described the anatomy of Dufour gland in three Asian Aenictus and argued that its structure, unusual among ants, shows affinity with Dorylus. Oldham et al. (1994) characterized the trail pheromone of Aenictus species related to A. laeviceps and demonstrated that it is produced by the postpygidial gland and Billen et al. (1999) further studied the structure of this gland. Hölldobler et al. (1996) described the histology and ultrastructure of the metatibial gland in Aenictus ceylonicus.
Association with Other Organisms
- An unknown species is a associate (details unknown) for the phorid fly Aenictacantha sentifera (a associate (details unknown)) (Quevillon, 2018).
- An unknown species is a associate (details unknown) for the phorid fly Aenigmatopoeus sodalis (a associate (details unknown)) (Quevillon, 2018).
All Associate Records for Genus
|Taxon||Relationship||Associate Type||Associate Taxon||Associate Relationship||Locality||Source||Notes|
|Aenictus||associate (details unknown)||phorid fly||Aenictacantha sentifera||associate (details unknown)||Quevillon, 2018|
|Aenictus||associate (details unknown)||phorid fly||Aenigmatopoeus sodalis||associate (details unknown)||Quevillon, 2018|
|Aenictus aratus||associate (details unknown)||phorid fly||Aenictacantha sentifera||associate (details unknown)||Quevillon, 2018|
|Aenictus aratus||associate (details unknown)||phorid fly||Rhynchomicropteron bifidspinarum||associate (details unknown)||Quevillon, 2018|
|Aenictus binghamii||host||staphylinid beetle||Giraffaenictus eguchii||myrmecophile||Vietnam||Maruyama, 2008|
|Aenictus cornutus||prey||phorid fly||Dohrniphora sp. N||predator||Quevillon, 2018|
|Aenictus decolor||associate (details unknown)||phorid fly||Aenictacantha crassitarsalis||associate (details unknown)||Quevillon, 2018|
|Aenictus dentatus||associate (details unknown)||phorid fly||Rhynchomicropteron necbeaveri||associate (details unknown)||Quevillon, 2018|
|Aenictus eugenii||associate (details unknown)||phorid fly||Aenigmatopoeus sequax||associate (details unknown)||Quevillon, 2018|
|Aenictus gracilis||prey||phorid fly||Dohrniphora sp. N||predator||Quevillon, 2018|
|Aenictus laeviceps||associate (details unknown)||phorid fly||Rhynchomicropteron nudiventer||associate (details unknown)||Quevillon, 2018|
All Flight Records for Genus
Life History Traits
- Queen number: monogynous (Schneirla, 1971; Frumhoff & Ward, 1992)
- Mean colony size: 60000-110000 (Greer et al., 2021)
- Compound colony type: not parasitic (Greer et al., 2021)
- Nest site: hypogaeic (Greer et al., 2021)
- Diet class: predator (Greer et al., 2021)
- Foraging stratum: subterranean/leaf litter; arboreal (Greer et al., 2021)
- Foraging behaviour: cooperative (Greer et al., 2021)
The majority of Aenictus species are monomorphic, with a few exhibiting some weak polymorphism. Aenictus inflatus is unusual within the genus as it has a distinctly polymorphic worker caste. There are a large number of species that are only known from males and most of the species described from workers have yet to be associated with any known male specimens.
Queens are highly specialised and look less like workers than in most ant species. They have greatly enlarged gasters and are termed dichthadiform. New colonies are created by the division of existing colonies, as opposed to individual queens founding alone.
• Antennal segment count: 8; 9; 10 • Antennal club: gradual, 2-3 weak • Palp formula: 2,2 • Total dental count: 1-20(0-5) • Spur formula: 2 simple, 2 simple; 1 simple-barbulate, 1 simple-pectinate; 1 simple-barbulate, 0; 0, 0 • Eyes: 0-1 ommatidia • Scrobes: absent • Pronotal Spines: absent • Mesonotal Spines: absent • Propodeal Spines: absent; dentiform • Petiolar Spines: absent • Caste: most monomorphic, a few species weakly polymorphic • Sting: present • Metaplural Gland: present • Cocoon: absent
These characters are collated in the table "WorkerMorphology". View table.
- near A. camposi: n = 15, 2n = 30 (Taiwan) (Hung et al., 1972) (the first record for the subfamily).
All Karyotype Records for Genus
|Aenictus||15||30||Taiwan||Hung et al., 1972||the first record for the subfamily|
|Aenictus brevicornis||24||India||Imai et al., 1984|
|Aenictus laeviceps||22||Malaysia||Imai et al., 1983|
The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.
- AENICTUS [Aenictinae]
- Aenictus Shuckard, 1840b: 266. Type-species: Aenictus ambiguus, by original designation.
- Aenictus senior synonym of Typhlatta: Forel, 1890b: ciii.
- Aenictus senior synonym of Paraenictus: Wilson, 1964: 444.
- ENICTUS [unavailable name]
- Enictus Walker, 1860: 306; Smith, F. 1865: 79; incorrect subsequent spellings of Aenictus: Bolton, 1995b: 19.
- PARAENICTUS [junior synonym of Aenictus]
- Paraenictus Wheeler, W.M. 1929g: 27 [as subgenus of Aenictus]. Type-species: Aenictus (Paraenictus) silvestrii, by monotypy.
- Paraenictus junior synonym of Aenictus: Wilson, 1964: 444.
- TYPHLATTA [junior synonym of Aenictus]
- Typhlatta Smith, F. 1857a: 79. Type-species: Typhlatta laeviceps, by monotypy.
- Typhlatta junior synonym of Aenictus: Forel, 1890b: ciii.
- Typhlatta revived from synonymy as subgenus of Aenictus: Wheeler, W.M. 1930g: 198.
- Typhlatta junior synonym of Aenictus: Wilson, 1964: 444.
Borowiec (2016) - The phylogenetic position of Aenictus has been difficult to infer. Phylogenomic data suggests that it is sister to the Aenictogiton plus Dorylus clade but they also show that these two lineages diverged very long ago, most likely in the Cretaceous (Borowiec, in prep.). The comprehensive morphology-based study of Brady and Ward (2005) placed it sister to Aenictogiton plus Dorylus; subsequent molecular analyses recovered it sister to New World army ants (Brady et al. 2006) and, later, sister to the Aenictogiton plus Dorylus clade, although with low support (Brady et al. 2014). The internal phylogeny shows that the African species of Aenictus are nested within South East Asian forms (Munetoshi Maruyama pers. comm.; Borowiec, in prep.).
Aenictus was first described based on a male from India, named for its ‘aenigmatical structure’ by Shuckard (1840b). Shuckard correctly recognized its affinity to other doryline ants, but the worker caste was not known at the time. Frederick Smith (1857) described a new genus based on workers, Typhlatta from Borneo, from material collected by Alfred Russell Wallace. It was not until 1890 that the male and workers of these ants were collected together (Forel 1890c).
The trend of describing unassociated males unfortunately continued and Aenictus is an example of ‘dual taxonomy’. Many names are either worker- or male-based, and there is no single species known from workers, queens and males (Gotwald and Leroux 1980, Bolton 2003). The internal phylogeny of the genus has been tackled with the cladistics analysis of Wilson (1964) and a phenetic study of quantitative traits (Gotwald and Barr 1988). As of this writing, Munetoshi Maruyama (pers. comm.) is working on a comprehensive molecular phylogeny of the genus. The taxonomy of the Asian forms received most attention and was first the subject of a thorough revision of Wilson (1964), recently followed by a long series of studies that described many new taxa and provided new keys for most of the species groups (Bharti et al. 2012, Jaitrong and Eguchi 2010, Jaitrong and Hashimoto 2012, Jaitrong and NurZati 2010, Jaitrong and Wiwatwitaya 2013, Jaitrong and Yamane 2010, 2011a, 2012b, 2013, Jaitrong et al. 2010, 2011, 2012, Li and Wang 2005, Liu et al. 2015, Mathew and Tiwari 2000, Staab 2014a, Staab 2015, Terayama and Yamane 1989, Terayama and Kubota 1993, Wang 2006, Wong and Guénard 2016, Wiwatwitaya and Jaitrong 2011, Yamane and Hashimoto 1999, Yamane and Wang 2015, Zettel and Sorger 2010, Zhou 2001, Zhou and Chen 1999). Jaitrong and Yamane (2011) established the current species-group classification and provided keys that make identifications in this large genus feasible. Shattuck (2008) revised the Australian species. In contrast to the Asian fauna, the taxonomy of African species has been largely neglected and never received a comprehensive treatment. Because of the above mentioned ‘dual taxonomy’ it is even difficult to give an estimate of the total number of species in the Afrotropical region, although Wilson (1964) estimated the number of species to be ‘at least 12’. Papers by Campione et al. (1983), Gotwald and Cunningham van Someren (1976), and Gotwald and Leroux (1980) are the only modern references discussing taxonomy of Afrotropical Aenictus. Several species of the genus reach the Palearctic region; recently Aktaç et al. (2004) and Radchenko and Alipanah (2004) discussed the West Palearctic species and Sharaf et al. (2012) described an additional species from Saudi Arabia.
Borowiec (2016) - Head: Antennae with 8, 9, or 10 segments. Apical antennal segment not enlarged, not broader and longer than two preceding segments combined to moderately enlarged, broader than and about equal in length to two preceding segments combined. Clypeus with cuticular apron. Lateroclypeal teeth absent. Parafrontal ridges absent or reduced. Torulo-posttorular complex vertical. Antennal scrobes absent. Labrum with median notch or concavity. Proximal face of stipes not projecting beyond inner margin of sclerite, prementum exposed when mouthparts fully closed. Maxillary palps 2-segmented. Labial palps 2-segmented. Mandibles triangular, with teeth or with one median tooth, or falcate. Eyes absent. Ocelli absent. Head capsule with differentiated vertical posterior surface above occipital foramen; in some species differentiation weak. Ventrolateral margins of head without lamella or ridge extending towards mandibles and beyond carina surrounding occipital foramen. Posterior head corners dorsolaterally immarginate. Carina surrounding occipital foramen ventrally absent. Mesosoma: Pronotal flange not separated from collar by distinct ridge. Promesonotal connection with suture completely fused. Pronotomesopleural suture completely fused; Aenictus philippinensis group species with grooved cuticular lip anteriorly. Mesometapleural groove not impressed to deeply impressed, conspicuous. Transverse groove dividing mesopleuron absent. Pleural endophragmal pit concavity absent. Mesosoma dorsolaterally immarginate. Metanotal depression or groove on mesosoma absent or present. Propodeal spiracle situated high on sclerite. Propodeal declivity with or without distinct dorsal edge or margin and triangular or broadly oval in posterior view. Metapleural gland with bulla visible through cuticle. Propodeal lobes present, short. Metasoma: Petiole anterodorsally marginate with carina low on anterior face, dorsolaterally immarginate, and laterally above spiracle immarginate or marginate. Helcium in relation to tergosternal suture placed at posttergite and infraaxial. Prora forming a V-shaped protrusion or narrowed into anteriorly directed spine. Spiracle openings of abdominal segments IV–VI circular. Abdominal segment III anterodorsally immarginate, dorsolaterally immarginate. Abdominal segment III about half size of succeeding segment IV, which is strongly constricted at presegmental portion (binodal waist). Girdling constriction of segment IV present, i.e. pre- and postsclerites distinct. Cinctus of abdominal segment IV a gradual concavity, not gutter-like. Abdominal segment IV conspicuously the largest segment. Abdominal tergite IV not folding over sternite, and anterior portions of sternite and tergite equally well visible in lateral view. Girdling constriction between pre- and posttergites of abdominal segments V and VI absent. Girdling constriction between pre- and poststernites of abdominal segments V and VI absent. Pygidium small, reduced to narrow strip, without impressed medial field and simple, not armed with cuticular spines or modified setae. Hypopygium unarmed. Legs: Mid tibia with two spurs, one barbulate and one simple, or with two simple spurs. Hind tibia with two barbulate/simple spurs or with one barbulate and one pectinate spur. Hind basitarsus not widening distally, circular in cross-section. Posterior flange of hind coxa not produced as raised lamella. Metatibial gland present as oval patch of whitish cuticle to patch occupying at least half of tibia length. Metabasitarsal gland absent. Hind pretarsal claws simple. Polymorphism: Monomorphic to moderately polymorphic.
Borowiec (2016) - Dichthadiiform, blind and with one or none ocelli, so far known in 13 species (Bharti 2003).
Borowiec (2016) - Head: Antennae with 13 segments. Clypeus without cuticular apron. Parafrontal ridges absent. Torulo-posttorular complex vertical, reduced to vertical carina or entirely absent. Maxillary palps 2-segmented. Labial palps 1-segmented. Mandibles falcate. Ventrolateral margins of head without lamella or ridge extending towards mandibles and beyond carina surrounding occipital foramen. Carina surrounding occipital foramen ventrally absent. Mesosoma: Pronotal flange not separated from collar by distinct ridge. Notauli absent. Transverse groove dividing mesopleuron absent. Propodeal declivity reduced, without distinct dorsal edge or margin. Metapleural gland opening absent. Propodeal lobes absent. Metasoma: Petiole anterodorsally immarginate, dorsolaterally immarginate, and laterally above spiracle immarginate. Helcium in relation to tergosternal suture placed at suture and axial. Prora simple, not delimited by carina. Spiracle openings of abdominal segments IV–VI circular, oval, or slit-shaped. Abdominal segment III more than half size of succeeding segment IV; latter weakly constricted at presegmental portion (uninodal waist). Girdling constriction of segment IV absent, i.e. pre- and postsclerites indistinct. Cinctus of abdominal segment IV absent, not impressed. Girdling constriction between pre- and postsclerites of abdominal segments V and VI absent. Abdominal segment IV not conspicuously largest segment. Abdominal sternite VII simple. Abdominal sternite IX distally armed with two spines, with lateral apodemes about as long as medial apodeme, directed anteriorly (towards head). Genitalia: Cupula strap-like, very short relative to rest of genital capsule and of approximately equal length on both dorsal and ventral surfaces. Basimere broadly fused to telomere, basimere with no sulcus trace at junction, and ventrally with left and right arms separated. Telomere expanded at apex. Volsella variable. Penisvalva not flattened at apex, expanded. Legs: Mid tibia without spurs or with two simple spurs. Hind tibia without spurs or with two simple spurs. Posterior flange of hind coxa not produced as raised lamella. Metatibial gland absent. Metabasitarsal glands absent. Hind pretarsal claws simple. Wings: Tegula present, narrow, demilanceolate in shape. Vein C in fore wing present. Pterostigma broad. Abscissa R·f3 absent. Abscissae Rs·f2–3 absent. Cross-vein 2r-rs present, connected to Rs·f2–3&Rs·f4. Abscissae Rs·f4–5 differentiated into Rs·f4 and Rs·f5 by 2rs-m. Abscissa M·f2 in fore wing contiguous with Rs+M. Abscissa M·f4 in fore wing present, reaching or not reaching wing margin. Cross-vein 1m-cu in fore wing present. Cross-vein cu-a in fore wing present, arising from Cu and distal to, at or near M·f1. Vein Cu in fore wing present, with only Cu1 branch prominent. Vein A in fore wing with abscissae A·f1 and A·f2 present. Vein C in hind wing absent. Vein R in hind wing absent or present, extending past Sc+R but not reaching distal wing margin. Vein Sc+R in hind wing present. Abscissa Rs·f1 in hind wing present, contiguous with Rs·f2. Abscissa Rs·f2 in hind wing present, not reaching wing margin. Cross-vein 1rs-m in hind wing present, about as long as M·f1. Vein M+Cu in hind wing present. Abscissa M·f1 in hind wing present. Abscissa M·f2 in hind wing present. Cross-vein cu-a in hind wing present. Vein Cu in hind wing present. Vein A in hind wing with abscissae A·f1 and A·f2 present.
Borowiec (2016) - Larvae of several Indomalayan and Australasian Aenictus species have been described (Wheeler 1943, Wheeler and Wheeler 1964b, 1984, 1990). Cocoons are absent.
- Arnold, G. 1915. A monograph of the Formicidae of South Africa. Part I. Ponerinae, Dorylinae. Ann. S. Afr. Mus. 14: 1-159 (page 136, Aenictus in Dorylinae, Ecitonini)
- Ashmead, W. H. 1905c. A skeleton of a new arrangement of the families, subfamilies, tribes and genera of the ants, or the superfamily Formicoidea. Can. Entomol. 37: 381-384 (page 381, Aenictus in Ecitoninae, Ecitonini)
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- Chapman, J. W.; Capco, S. R. 1951. Check list of the ants (Hymenoptera: Formicidae) of Asia. Monogr. Inst. Sci. Technol. Manila 1: 1-327 (page 10, Aenictus in Dorylinae, Ecitonini)
- Dalla Torre, K. W. von. 1893. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. Vol. 7. Formicidae (Heterogyna). Leipzig: W. Engelmann, 289 pp. (page 7, Aenictus in Dorylinae)
- Disney, R.H.L. & Kistner, D.H. (1991) A new genus of Australasian/Oriental Phoridae associated with driver ants (Diptera; Hymenoptera, Formicidae). Sociobiology, 18, 269–281.
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- Donisthorpe, H. 1943g. A list of the type-species of the genera and subgenera of the Formicidae. [part]. Ann. Mag. Nat. Hist. 11(10): 617-688 (page 620, Aenictus in Dorylinae, Ecitonini)
- Emery, C. 1895l. Die Gattung Dorylus Fab. und die systematische Eintheilung der Formiciden. Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 8: 685-778 (page 765, Aenictus in Dorylinae, Dorylini [Dorylii])
- Emery, C. 1910b. Hymenoptera. Fam. Formicidae. Subfam. Dorylinae. Genera Insectorum 102: 1-34 (page 28, Aenictus in Dorylinae, Ecitonini [Ecitini])
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- Articles using diversity taxobox
- Ergatoid queen
- Photo Gallery
- Zhangpu amber fossil
- Phorid fly Associate
- Host of Aenictacantha sentifera
- Host of Aenigmatopoeus sodalis
- Genus with Associate
- Genus with Flight Month
- Genus with Karyotype
- Extant genus
- Dorylinae genera