Myrmica jessensis

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Myrmica jessensis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Myrmicini
Genus: Myrmica
Species: M. jessensis
Binomial name
Myrmica jessensis
Forel, 1901

Myrmica jessensis P casent0900294.jpg

Myrmica jessensis D casent0900294.jpg

Specimen Label

Synonyms


Common Name
Ezo-kushike-ari
Language: Japanese

In Japan M. jessensis is primarily found in open grasslands or bare lands, and can be abundant in dry riverbeds (Ichinose 1990; Japanese Ant Image Database) and is quite common on mown roadside verges on Hokkaido island. More generally it is a species of open areas at altitudes up to 1700 m and sometimes is quite abundant on riverbanks (Morisita,1945; Kondoh 1994) and has been found at 20 m elevation in the dry bed of the Sagami River, Kanagawa Prefecture (Kubota, 1983). It builds nests in soil, often under stones (Imai et al. 2003; Radchenko 2005). A nuptial flight was observed in September (Ichinose 1990) (Radchenko & Elmes, 2010).

Identification

A member of the lobicornis complex of the lobicornis species group and it most resembles Myrmica eidmanni, from which it differs principally by its narrower frons and shallower metanotal groove. (Radchenko and Elmes 2010)

According to Terayama et al. (2024), Myrmica jessensis is morphologically similar to Myrmica surusumi, sharing features such as the antennal scape narrowed near the base, sharply angled at the base with a small vertical lobe, strongly curved frontal carina resulting in a narrow frons and extended frontal lobe, widened propodeal spines at the base, and a distinctly concave anterior surface of the petiolar node. However, M. jessensis can be distinguished from M. surusumi by the following characteristics:

  • In workers and gynes, M. jessensis has an almost right-angle dorsum of the antennal scape bend (acute triangle in M. surusumi), a straight anterior margin of the scape base in lateral view (convex in M. surusumi), a straight dorsal margin of the scape base in anterior view (convex in M. surusumi), and a convex dorsal margin of the propodeum (straight in M. surusumi).
  • In males, M. jessensis has a shorter antennal scape (SL 0.61±0.04, HW 0.95±0.02, SI2 0.65±0.02, n=15) compared to M. surusumi (SL 0.70±0.02, HW 0.82±0.03, SI2 0.85±0.02, n=15), and the posterodorsal corner of the propodeum has a dull spine (absent in M. surusumi).
  • Terayama et al. (2024), Fig. 8. Scape length-head width relationship of Myrmica surusumi (blue) and Myrmica jessensis Forel, 1901 (orange) in males. Relationship is defined as follows: Y = 0.584 X + 0.220 (r = 0.796, p<0.01) in M. surusumi, and Y = 0.582 X + 0.060 (r = 0.813, p<0.01) in M. jessensis, where Y is the scape length, and X is the head width.

Keys including this Species

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 43.08333333° to 28.739°.

   
North
Temperate 		North
Subtropical 		Tropical South
Subtropical 		South
Temperate

Distribution based on Regional Taxon Lists

Palaearctic Region: Democratic Peoples Republic of Korea, Japan (type locality), Republic of Korea, Russian Federation.

Distribution based on AntMaps

AntMapLegend.png

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.
pChart

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.
pChart

Biology

Association with Other Organisms

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Other Ants

  • This species is a host for the ant Myrmica yadori (a workerless inquiline) in Japan (Terayama et al., 2024).
  • This species is a host for the ant Formica sanguinea (a slave maker) (Hayashida, 1966).

Flight Period

X
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

 Notes: Japan.

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Castes

Nomenclature

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

  • jessensis. Myrmica lobicornis var. jessensis Forel, 1901e: 371 (w.) JAPAN. Subspecies of lobicornis: Weber, 1948a: 286. Raised to species: Collingwood, 1976: 302; Kupyanskaya, 1986a: 85; Kupyanskaya, 1990: 110. Senior synonym of hyungokae: Radchenko, 2005b: 141. See also: Radchenko & Elmes, 2010: 157.
  • hyungokae. Myrmica hyungokae Elmes, Radchenko & Kim, 2001: 109, figs. 1e-h (w.) KOREA. Junior synoym of jessensis: Radchenko, 2005b: 141.

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

Description

Etymology

Radchenko and Elmes (2010) - from name Jesso combined with the Latin suffix ensis = place of origin, to indicate that the type region is Jesso (modern Hokkaido, Japan). In the 16th century Jesso was the northern border areas of Japan, including Hokkaido, Sakhalin and Kurilen islands inhabited by the Ainu peoples.

References

References based on Global Ant Biodiversity Informatics

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