Strumigenys emmae

Strumigenys emmae
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Myrmicinae
Tribe:	Attini
Genus:	Strumigenys
Species:	S. emmae
Binomial name
Strumigenys emmae (Emery, 1890) Specimen labels
Synonyms
Epitritus clypeatus Szabó, 1909 Epitritus clypeatus malesiana Forel, 1913 Epitritus wheeleri Donisthorpe, 1916

Common Name
Yofushi-uroko-ari
Language:	Japanese

A pantropical species, dispersed by human commerce (Brown, 1949b) and natural dispersal (Taylor in Kubota, 1976). It is found most often in highly disturbed habitats such as beach margins and agricultural areas. The geographic origin of emmae is apparently Australia, where several related species occur (Bolton 2000).

At a Glance

• Highly invasive  • Parthenogenetic

Identification

Bolton (2000) - Within the Strumigenys emmae-group, emmae is recognised by its combination of short mandibles, broad head, short 4-merous antennae with distinctly angular leading edge on the scape, presence of orbicular hairs on the promesonotum as well as on the cephalic dorsum, absence of erect hairs on the occipital margin and lack of a strong second preapical tooth located between the apicodorsal tooth and the long spiniform preapical tooth.

• 

  Tang & Guenard (2023), Fig. 17. New species records of Strumigenys in full-face, profile and dorsal views. A–C. Worker of S. emmae from Thailand (ANTWEB1011939). D–F. Worker of S. exilirhina from Hainan, mainland China (HNA-00471). G–I. Worker of S. feae from Hainan, mainland China (HNA-01127).

Keys including this Species

• Key to Afrotropical Strumigenys
• Key to Australian Strumigenys Species
• Key to Malagasy Strumigenys
• Key to Micronesian Ants
• Key to Neotropical and Nearctic Strumigenys
• Key to Strumigenys of East Asia
• Key to Strumigenys of Hispaniola
• Key to Strumigenys of India
• Key to US Strumigenys species

Distribution

Bolton (2000) - This very successful pantropical tramp species was described and discussed by Brown (1949a) and Bolton (1983). Previous distribution records include Hawaii, Guam, U.S.A., Puerto Rico, West Indies, Cuba, Bahamas, Surinam, Ghana, Equatorial Guinea, India, West Malaysia, Sumatra, Singapore, Philippines, Sulawesi, New Guinea, Solomon Islands, Australia, Vanuatu, Samoa (Brown, 1949a; Wilson & Taylor, 1 967; Kempf, 1972; Taylor, 1976; Bolton, 1983; Deyrup, 1997). A recent survey of Florida by Deyrup & Deyrup (1999) and Deyrup, Davis & Cover (2000) shows that emmae is widely distributed in the state.

This species has been recorded in Japan only from Ogasawara Islands (Kubota, 1976; Shindo, 1979; Japanese Ant Image Database).

Latitudinal Distribution Pattern

Latitudinal Range: -10.75° to -33.27971°.

North Temperate	North Subtropical	Tropical	South Subtropical	South Temperate

• Source: AntMaps

Distribution based on Regional Taxon Lists

Afrotropical Region: Comoros, Equatorial Guinea, Ghana, United Republic of Tanzania, Yemen.
Australasian Region: Australia, New Caledonia.
Indo-Australian Region: Borneo, Guam, Hawaii, Indonesia, Malaysia, Marshall Islands, Micronesia (Federated States of), New Guinea, Northern Mariana Islands, Philippines, Samoa, Singapore, Solomon Islands, Tonga, Vanuatu.
Malagasy Region: Madagascar, Mayotte, Réunion, Seychelles.
Nearctic Region: United States.
Neotropical Region: Anguilla, Aruba, Barbados, Belize, British Virgin Islands, Cayman Islands, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, Galapagos Islands, Greater Antilles, Grenada, Guadeloupe, Mexico, Netherlands Antilles, Puerto Rico, Saint Lucia, Suriname.
Oriental Region: India, Sri Lanka, Thailand, Vietnam.
Palaearctic Region: China, Japan, Poland.

Distribution based on AntMaps

Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.

Biology

This species occurs in both dry and mesic woods, and in disturbed areas such as gardens (Deyrup, Davis & Cover, 2000), and is often found in relatively dry leaf litter. Dealate queens are notable common in leaf litter with small groups of workers, giving the impression that the colonies are producing new queens while the colony is small. This impression, if correct, would fit the strategy of a weedy inhabitant of frequently disturbed sites (Deyrup 1997).

Deyrup and Deyrup (1999) - Two colonies were examined. One was in a hollow acorn in leaf litter in a mesic forest at Spruce Creek Preserve, Volusia Co.; this nest had one queen, 14 workers, and brood. A second colony was found in a hollow, buried acorn of Quercus chapmanii in xeric scrub forest at the Archbold Biological Station. Highlands Co. This colony had one queen, 42 workers, and brood. When the acorn from Highlands Co. was opened, there was one dead, white mite with one leg detached, and a shriveled entombryid collembolan that was being eaten by a larva. This colony was offered sifted leaf-litter and the next day there were 7 dead entomobryids in the colony inside the acorn, including one collembolan that was being eaten by a larva. The next day two larvae were seen feeding on entomobryids. It appears that entomobryid Collembola are a preferred prey of S. emmae.

Deyrup, Davis & Cover (2000) - The species Strumigenys eggersi and Strumigenys emmae are the only dacetine ants that are commonly found in dry and mesic habitats of south and central Florida. There is little evidence that native dacetines were ever common in these areas, but if these two exotics continue their northward expansion we may be able to get some idea of their effect on native ants, since we have records of hundreds of litter samples from north Florida. These species are probably more or less specialized predators on entomobryiid Collembola. If they have not had an impact by reducing or replacing the populations of native predators of Collembola in south Florida, they must be a novel predator of the Collembola themselves in this area.

Brown (1949) - Nothing is known of the food preferences. Many of the collecting records are of single females taken under objects lying on sea beaches; workers have been taken with the sieve and Berlese funnel in both forested and agricultural areas, usually near the sea. This ant seems to show tolerance for a wider range of environmental conditions than most dacetines.

Tang et al. (2019) - In Hong Kong, this introduced species is found mostly in disturbed habitats, including managed grasslands, isolated patches of urban trees, and with a single record from a secondary forest but located slightly over 100 m from urban habitations. Common in the Mai Po Nature Reserve, a heavily disturbed landscape managed for bird populations. Known elevation range in Hong Kong is from 1 to 407 m. A single alate gyne was collected between June 27 and July 11 in a Malaise trap located within a mangrove area.

Castes

Worker

Images from AntWeb

Worker. Specimen code casent0060342. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by CAS, San Francisco, CA, USA.

Syntype of Strumigenys emmae. Worker. Specimen code casent0102082. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by MSNG, Genoa, Italy.

Worker. Specimen code casent0104133. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by ABS, Lake Placid, FL, USA.

Worker. Specimen code casent0133445. Photographer Erin Prado, uploaded by California Academy of Sciences.	Owned by CAS, San Francisco, CA, USA.

Worker. Specimen code casent0135353. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by CAS, San Francisco, CA, USA.

Worker. Specimen code casent0178454. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by BNM, Koror, Palau.

Specimen code lacm. .

Worker. Specimen code casent0173254. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by CDRS, Galapagos, Ecuador.

Worker. Specimen code casent0133446. Photographer Erin Prado, uploaded by California Academy of Sciences.	Owned by CAS, San Francisco, CA, USA.

Queen

Images from AntWeb

Queen (alate/dealate). Specimen code casent0060340. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by CAS, San Francisco, CA, USA.

Worker. Specimen code casent0104516. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by ABS, Lake Placid, FL, USA.

Queen (alate/dealate). Specimen code casent0135362. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by CAS, San Francisco, CA, USA.

Queen (alate/dealate). Specimen code casent0173253. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by CDRS, Galapagos, Ecuador.

Male

Images from AntWeb

Male (alate). Specimen code casent0133418. Photographer Erin Prado, uploaded by California Academy of Sciences.	Owned by CAS, San Francisco, CA, USA.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

• emmae. Epitritus emmae Emery, 1890b: 70, pl. 8, fig. 6 (w.) ANTILLES. Wheeler, W.M. 1908a: 149 (q.). Combination in Quadristruma: Brown, 1949b: 48; in Strumigenys: Bolton, 1999: 1674. Senior synonym of clypeatus, malesiana, wheeleri: Brown, 1949b: 48. See also: Bolton, 1983: 400; Bolton, 2000: 950.
• clypeatus. Epitritus clypeatus Szabó, 1909: 27, fig. 1 (w.) NEW GUINEA. Junior synonym of emmae: Brown, 1949b: 48.
• malesiana. Epitritus clypeatus var. malesiana Forel, 1913k: 83 (w.q.) INDONESIA (Sumatra). Junior synonym of emmae: Brown, 1949b: 48.
• wheeleri. Epitritus wheeleri Donisthorpe, 1916a: 121 (w.) HAWAII. Junior synonym of emmae: Brown, 1949b: 48.

Type Material

• Epitritus emmae Emery, 1890: Holotype, worker, St. Thomas Island, Virgin Islands, museum unknown (prob. MCSN (Genoa)).

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

Bolton (2000) - TL 1.5 - 1.9, HL 0.40 - 0.46, HW 0.33 - 0.39, CI 80 - 88, ML 0.11 - 0.16, MI 26 - 35, SL 0.18 - 0.24, SI 56 - 62, PW 0.21 - 0.25 , AL 0.40 - 0.48 (33 measured). Exposed length of fully closed mandible less than width of anterior clypeal margin. Preapical dentition of mandible somewhat variable: inner margin between the spiniform preapical tooth and the apicodorsal tooth may be unarmed, may have a low blunt tubercle or welt, or may have a tiny denticle (intermediates between these are known). Intercalary and preapical dentition may be obscured by the principal teeth when the mandibles are fully closed. Antenna with 4 segments; second funicular segment not obviously much longer than broad. Cephalic dorsum with orbicular hairs; upper scrobe margin fringed with similar hairs and with a clavate apicoscrobal hair. Occipital margin of head without short erect hairs. Leading edge of scape flattened and expanded into an obtuse angle or broad but shallowly convex lobe in the median third of its length. Pronotal humeral hair stiff, stout. Ground-pilosity of pronotal dorsum orbicular but the hairs tending to be smaller than on head. Mesonotum usually with a single pair of short erect hairs but these sometimes absent. Promesonotal dorsum reticulate-punctate, without longitudinal striae. Disc of postpetiole usually with weak sculpture at least in part, only rarely entirely smooth; sides of disc in dorsal view with projecting spongiform tissue. First gastral tergite with short suberect to erect stubbly hairs that are simple to feeble expanded apically. Basigastral costulae at least equal in length to postpetiole disc.

Type Material

Bolton (2000):

Holotype worker, ST THOMAS I. (Antilles) (Museo Civico di Storia Naturale, Genoa).

Epitritus clypeatus Szabó, 1909: 1, figs. la, c. Syntype workers, NEW GUINEA: Berlinhafen (L. Biró); and SINGAPORE (L. Biró) (Hungarian Natural History Museum) [not seen].

Epitritus clypeatus var. malesiana Forel, 1913e: 83. Syntype workers and queen, INDONESIA: Sumatra (Buttel-Reepen) (Musee d'Histoire Naturelle Genève) [not seen].

Epitritus wheeleri Donisthorpe, 1916: 121. Holotype worker, HAWAII: Oahu, Honolulu (R.C.L. Perkins) [not in The Natural History Museum, holotype lost].

Etymology

Named after Emma Forel, the wife of ant taxonomist Auguste Forel.

References

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References based on Global Ant Biodiversity Informatics

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