Messor mcarthuri

Messor mcarthuri
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Myrmicinae
Tribe:	Stenammini
Genus:	Messor
Species group:	structor
Species:	M. mcarthuri
Binomial name
Messor mcarthuri Steiner, Csősz, Markó, Gamisch, Rinnhofer, Folterbauer, Hammerle, Stauffer, Arthofer & Schlick-Steiner, 2018 Holotype Labels

Described from Greece and western Turkey. In Greece, prefers lowlands and highland habitats up to 820 m a.s.l. Nests were observed in various open habitats like pastures, stone hills, roadsides, sides of oak forests, olive plantations, ruderal areas in tourist resorts but also in limestone gorges or stream valleys with open deciduous forests (Salata & Borowiec, 2019).

Specimens from the vicinity of the Medenbuk and Golyam Dervent villages have intermediate characteristics between M. mcarthuri and Messor hellenius, which may indicate a possible hybridisation between these species (Lapeva-Gjonova & Borowiec, 2022).

Identification

Steiner et al. (2018) – Worker and queen. Colour generally lighter as in Messor muticus and Messor ponticus. Discrimination from all species based on very regular costate sculpture of head and body generally, petiole included. Discrimination from M. muticus and Messor structor by base of scape lacking lobe, short 1st funicular segment, from M. muticus, M. ponticus, and M. structor by imbricate surface of 1st gastral tergite, and from M. ponticus by side of head covered abundantly with standing setae.

Worker. Similarly sized as M. ponticus, usually larger than Messor ibericus, M. muticus, and M. structor. Safe discrimination from M. structor only feasible by morphometrics. Discrimination from all other species based on the regular costate surface of body including petiole and postpetiole. Also using morphometrics, Messor mcarthuri can be separated safely from any other species treated in this revisiona using a linear discriminant function.

Queen. Larger than M. ibericus, similarly sized as M. muticus, M. ponticus, and M. structor. Discrimination from M. ibericus by reduced reticulation and rugosity of anepisternum and katepisternum.

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 41.21394° to 34.96667°.

North Temperate	North Subtropical	Tropical	South Subtropical	South Temperate

• Source: AntMaps

Distribution based on Regional Taxon Lists

Palaearctic Region: Bulgaria, Greece, Türkiye (type locality).

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

mtDNA: Six haplotypes of COI (1375 bp) known (GenBank).

Nomenclature

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

• mcarthuri. Messor mcarthuri Steiner, Csösz, et al. 2018: 401, figs. 2, 5ae, be, ce, de, ee (w.q.) TURKEY, GREECE.
  • Type-material: holotype worker, 8 paratype workers.
  • Type-locality: holotype Turkey: Mugla, Köycegiz, 25.ix.2008, TR271 (Csösz); paratypes with same data.
  • Type-depositories: HNHM (holotype); HNHM, NHMW (paratypes).
  • Status as species: Borowiec, L. & Salata, 2018: 6; Salata & Borowiec, 2018c: 46; Salata & Borowiec, 2019a: 62.
  • Distribution: Greece, Turkey.

Taxonomic Notes

Salata & Borowiec (2019) (misidentifications):

• As Messor muticus: Borowiec and Salata, 2012: 514 (part).
• As Messor orientalis: Borowiec and Salata, 2012: 515 (part), 2017b: 214; Bračko et al., 2016: 23.

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

Description

Worker and queen. Colour: Head and mesosoma brown to brownish red, gaster dark brown. Major workers can be dark brown entirely. Size: Large. Head: Regularly costate throughout, interstices reticulate. In major and most medium workers, costae present on much of postocular region. Erect setae abundant on side of head from occiput to mandibular insertion. Scape: Base without lobe. Laterally directed, tooth-like process in major worker present, less distinct in minor worker. 1st funicular segment short and flattened, longer than 2nd segment, but clearly shorter than 2nd and 3rd segment together. Clypeus: Median notch well defined; can be shallow in minor worker. Pronotum: Middle mostly shining, laterally irregularly running costae. Mesonotum: Regularly costate entirely. Mesopleuron: With slightly irregular transverse costae, well developed punctuation among costae. Propodeum: Mostly smoothly or obliquely rounded, never angled even in major worker; with well-developed distinct longitudinal carinae on both sides. Petiole: With regular costae. Surface of 1st gaster tergite: Entire surface imbricate. Covered with thick whitish, sparse hairs, some of which decumbent or subdecumbent.

Queen: Metanotum: Regularly costate. Anepisternum: Smooth and shining. Katepisternum: Sides covered with fine costulae, middle smooth and shining.

Type Material

Turkey TR271 Mugla, Köycegiz 25.09.2008 leg. Csősz [–] Holotypus Messor” “mcarthuri” [on the reverse side: Top specimen design. Csősz 2016] (Hungarian Natural History Museum).

Paratypes: 8 workers labelled as the holotype: Turkey TR271 Mugla, Köycegiz 25.09.2008 leg. Csősz (3 paratype workers: Naturhistorisches Museum Wien, Vienna; 5 paratype workers: HNHM).

Etymology

Named in honour of ant taxonomist Archie J. McArthur who we remember for his outstanding enthusiasm, dedication, and warmth.

References

• Borowiec, L., Salata, S. 2022. Notes on ants (Hymenoptera: Formicidae) of Thassos Island, Greece. Annals of the Upper Silesian Museum in Bytom, Entomology 31 (online 2): 1-15 (doi:10.5281/ZENODO.6123287).
• Borowiec, L., van Delft, J.P.L., van Delft, J.J.C.W., Salata, S. 2023. Five ant species (Hymenoptera: Formicidae) new to the Greek fauna with notes on ants from Greek Thrace. Annales of the Upper Silesian Museum in Bytom, Entomology 32 (online 008), 1-13 (doi:10.5281/ZENODO.10101028).
• Borowiec, L., Wieczorek, K., Salata, S. 2021. Review of ants (Hymenoptera: Formicidae) of the Dodecanese Archipelago, Greece. Annals of the Upper Silesian Museum in Bytom Entomology 30: 1-33 (doi:10.5281/ZENODO.5571270).
• Kiran, K., Karaman, C. 2020. Additions to the ant fauna of Turkey (Hymenoptera, Formicidae). Zoosystema 42(18), 285-329 (doi:10.5252/zoosystema2020v42a18).
• Kiran, K., Karaman, C. 2020. Additions to the ant fauna of Turkey (Hymenoptera, Formicidae). Zoosystema 42(18): 285‑329 (doi:10.5252/zoosystema2020v42a18).
• Lapeva-Gjonova, A., Antonova, V. 2022. An updated checklist of ants (Hymenoptera, Formicidae) of Bulgaria, after 130 years of research. Biodiversity Data Journal 10, e95599 (doi:10.3897/bdj.10.e95599).
• Lapeva-Gjonova, A., Borowiec, L. 2022. New and little-known ant species (Hymenoptera, Formicidae) from Bulgaria. Biodiversity Data Journal, 10: e83658 (doi:10.3897/bdj.10.e83658).
• Salata, S., Borowiec, L. 2019. Preliminary contributions toward a revision of Greek Messor Forel, 1890 (Hymenoptera: Formicidae). Turkish Journal of Zoology 43:52-67 (doi:10.3906/zoo-1809-41).
• Salata, S., Borowiec, L., Trichas, A. 2020. Review of ants (Hymenoptera: Formicidae) of Crete, with keys to species determination and zoogeographical remarks. Monographs of the Upper Silesian Museum No 12: 5–296 (doi:10.5281/ZENODO.3738001).
• Salata, S., Demetriou, J., Georgiadis, C., Borowiec, L. 2023. The genus Messor Forel, 1890 (Hymenoptera: Formicidae) in Cyprus. Annales Zoologici 73(2): 215-234 (doi:10.3161/00034541anz2023.73.2.006).
• Steiner, F.M., Csősz, S., Markó, B., Gamisch, A., Rinnhofer, L., Folterbauer, C., Hammerle, S., Stauffer, C., Arthofer, W. & Schlick-Steiner, B.C. 2018. Turning one into five: Integrative taxonomy uncovers complex evolution of cryptic species in the harvester ant Messor “structor”. Molecular Phylogenetics and Evolution, 127: 387–404 (doi:10.1016/j.ympev.2018.04.005).

References based on Global Ant Biodiversity Informatics

• Borowiec L., and S. Salata. 2018. Notes on ants (Hymenoptera: Formicidae) of Samos Island, Greece. Annals of the Upper Silesian Museum in Bytom Entomology 27: 1-13.
• Salata S., L. Borowiec, and A.Trichas. 2018. Taxonomic Revision of the Cretan Fauna of the Genus Temnothorax Mayr, 1861 (Hymenoptera: Formicidae), with Notes on the Endemism of Ant Fauna of Crete. Annales Zoologici (Warsaw) 68(4): 769-808.
• Salata S., and L. Borowiec. 2018. Taxonomic and faunistic notes on Greek ants (Hymenoptera: Formicidae). Annals of the Upper Silesian Museum in Bytom Entomology 27: 1-51.
• Salata S., and L. Borowiec. 2019. Preliminary contributions toward a revision of Greek Messor Forel, 1890 (Hymenoptera: Formicidae). Turkish Journal of Zoology 43: 52-67.
• Salata S., and L. Borowiec. 2019. Preliminary division of not socially parasitic Greek Temnothorax Mayr, 1861 (Hymenoptera, Formicidae) with a description of three new species. ZooKeys 877: 81-131.
• Steiner F. M., S. Csosz, B. Marko, A. Gamisch, L. Rinnhofer, C. Folterbauer, S. Hammerle, C. Stauffer, W. Arthofer, B. C. Schlick‐Steiner. 2018. Turning one into five: Integrative taxonomy uncovers complex evolution of cryptic species in the harvester ant Messor “structor”. Molecular Phylogenetics and Evolution https://doi.org/10.1016/j.ympev.2018.04.005