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Monomorium xuthosoma
| Monomorium xuthosoma | |
|---|---|
| |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Hymenoptera |
| Family: | Formicidae |
| Subfamily: | Myrmicinae |
| Tribe: | Solenopsidini |
| Genus: | Monomorium |
| Species: | M. xuthosoma |
| Binomial name | |
| Monomorium xuthosoma Heterick, 2006
| |
Most specimens seen have come from the southwestern corner of Madagascar. One slightly aberrant worker (MCZ) was taken from Berenty Reserve, in the south-east. Monomorium xuthosoma appears to be confined to spiny forest, where individuals have been taken from sifted litter and members of a colony were found in a rotten log. (Heterick 2006)
Identification
Heterick (2006) - A member of the M. rhopalocerum complex in the M. monomorium species group. Monomorium xuthosoma strongly resembles Monomorium termitobium form binatu but can be distinguished from that form by its larger propodeal spiracle, the slightly different shape of the propodeum, its higher postpetiole and the pilosity of the promesonotum (at least four prominent pairs of erect setae present, including the infrahumeral pair). The queen is similar in form to that of binatu, but the frons is markedly longitudinally striolate.
Keys including this Species
Distribution
Latitudinal Distribution Pattern
Latitudinal Range: -23.15° to -25.01666667°.
| North Temperate |
North Subtropical |
Tropical | South Subtropical |
South Temperate |
- Source: AntMaps
Distribution based on Regional Taxon Lists
Malagasy Region: Madagascar (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. |
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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. |
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Biology
Castes
Worker
Images from AntWeb
   
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| Holotype of Monomorium xuthosoma. Worker. Specimen code casent0020507. Photographer April Nobile, uploaded by California Academy of Sciences. | Owned by CAS, San Francisco, CA, USA. |
Queen
Images from AntWeb
   
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| Queen (alate/dealate). Specimen code casent0020421. Photographer April Nobile, 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.
- xuthosoma. Monomorium xuthosoma Heterick, 2006: 151, figs. 25, 69 (w.q.) MADAGASCAR.
- Type-material: holotype worker, 9 paratype workers, 2 paratype queens.
- Type-locality: holotype Madagascar: Prov. Toliara, Tsimanampetsotsa, 6.7 km. 130° SE Efoetse, 24°06’S, 43°46’E, 25 m., 18-22.iii.2002, BLF 6160, sifted litter, spiny forest thicket (B.L. Fisher, et al.); paratypes with same data.
- Type-depositories: CASC (holotype); ANIC, BMNH, CASC, MCZC (paratypes).
- Distribution: Madagascar.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Description
Worker
Worker caste monomorphic: HML 1.14 HL 0.44 HE 0.35 CeI 80 SL 0.33 SI 94 PW 0.24.
HML 1.13–1.32 HL 0.43–0.5 HW 0.35–0.42 CeI 79-84 SL 0.32–0.39 SI 90–93 PW 0.23–0.28 (n=20).
HEAD: Head rectangular; vertex planar or weakly concave; frons shining and smooth except for piliferous pits; pilosity of frons a mixture of well-spaced, distinctly longer erect and semi-erect setae interspersed with shorter decumbent setae or setulae. Eye moderate, eye width 1–1.5× greatest width of antennal scape; (in full-face view) eyes set below midpoint of head capsule; (viewed in profile) eyes set around midline of head capsule; eye elliptical, curvature of inner eye margin may be more pronounced than that of its outer margin. Antennal segments 12; antennal club three-segmented. Clypeal carinae always well-defined; anteromedian clypeal margin emarginate, clypeal carinae terminating in blunt angles; paraclypeal setae moderately long and fine, curved; posteromedian clypeal margin extending slightly beyond level of posterior margin of antennal fossae. Anterior tentorial pits situated nearer antennal fossae than mandibular insertions. Frontal lobes sinuate, divergent posteriad. Psammophore absent. Palp formula 2,2. Mandibular teeth three, plus minute, basal denticle or angle; mandibles with subparallel inner and outer margins, smooth (except for piliferous pits); masticatory margin of mandibles approximately vertical or weakly oblique; basal tooth a small to minute denticle or angle, much smaller than t3 (four teeth present).
MESOSOMA: Promesonotum shining and mainly smooth, vestigial striolae, if present, confined to lower anterior mesopleuron; (viewed in profile) promesonotum broadly convex anteriad, convexity reduced posteriad; promesonotal setae seven to twelve; standing promesonotal setae a mixture of well-spaced, distinctly longer, erect and semi-erect setae which are curved distally and often paired, interspersed with much shorter, incurved, decumbent setae; appressed promesonotal setulae very sparse or absent. Metanotal groove strongly impressed, with distinct transverse costulae. Propodeum shining and smooth, with a few weak striolae on metapleuron; propodeal dorsum convex; Propodeum always smoothly rounded; standing propodeal setae consisting of one prominent pair anteriad, with other shorter setae very sparse or absent; appressed propodeal setulae very sparse or absent; propodeal spiracle nearer metanotal groove than declivitous face of propodeum. Vestibule of propodeal spiracle absent or not visible. Propodeal lobes present as rounded flanges.
PETIOLE AND POSTPETIOLE: Petiolar spiracle lateral and situated within anterior sector of petiolar node; petiolar node, in profile, cuneate, vertex tapered; appearance of node shining and smooth throughout; ratio of greatest node breadth (viewed from front) to greatest node width (viewed in profile) between 4:3 and1:1; anteroventral petiolar process absent or vestigial; ventral petiolar lobe absent; height ratio of petiole to postpetiole between 4:3 and 1:1; height–length ratio of postpetiole between 4:3 and 1:1; postpetiole shining and smooth; postpetiolar sternite without anterior lip or carina, or this structure vestigial.
GASTER: Pilosity of first gastral tergite consisting of well-spaced, erect and semi-erect setae interspersed with a few appressed setulae.
GENERAL CHARACTERS: Color foreparts tawny-yellow to orange (postpetiole sometimes darker), antenna brown, gaster chocolate.
Queen
HML 2.27–2.43 HL 0.63–0.66 HW 0.58–0.61 CeI 91–95 SL 0.49–0.52 SI 83–86 PW 0.50–0.54 (n=9).
HEAD: Head square; vertex always planar; frons shining and longitudinally striolate, with some smooth areas; pilosity of frons a mixture of well-spaced, distinctly longer erect and semi-erect setae interspersed with shorter setae or setulae, which are decumbent or appressed, longer setae thickest on vertex. Eye ovoid, narrowed posteriad; (in full-face view) eyes set at about midpoint of head capsule; (viewed in profile) eyes set around midline of head capsule.
MESOSOMA: Anterior mesoscutum smoothly rounded, thereafter more-or-less flattened; pronotum, mesoscutum and mesopleuron shining and mainly smooth, vestigial striolae, if present, confined to anterior katepisternum; length–width ratio of mesoscutum and scutellum combined about 2:1; axillae separated by width of at least one axilla to narrowly separated (i.e., less than width of one axilla); standing pronotal/mesoscutal setae consisting of well-spaced, incurved, erect and semierect setae only; appressed pronotal, mescoscutal and mesopleural setulae very sparse or absent. Propodeum shining and smooth, with a few weak striolae on metapleuron; propodeum always smoothly rounded; propodeal dorsum convex; standing propodeal setae consisting of up to a dozen or more longer erect and shorter sub-erect setae; appressed propodeal setulae very sparse or absent; propodeal spiracle nearer metanotal groove than declivitous face of propodeum; propodeal lobes present as well-developed, rounded flanges.
WING: Wing not seen (queen dealated).
PETIOLE AND POSTPETIOLE: Petiolar spiracle lateral and situated within anterior sector of petiolar node; node (viewed in profile) cuneate, vertex tapered; appearance of node shining and weakly striolate posteriad; ratio of greatest node breadth (viewed from front) to greatest node width (viewed in profile) between 4:3 and 1:1; anteroventral petiolar process absent or vestigial; height ratio of petiole to postpetiole between 4:3 and 1:1; height–length ratio of postpetiole between 3:2 and 1:1; postpetiole shining and weakly striolate posteriad; postpetiolar sternite without anterior lip or carina, or this structure vestigial.
GASTER: Pilosity of first gastral tergite consisting of well-spaced, erect and semi-erect setae interspersed with a few appressed setulae.
GENERAL CHARACTERS: Color foreparts dark yellowish-brown, gaster and antennal scape brown. Brachypterous alates not seen. Ergatoid or worker-female intercastes not seen.
Type Material
Holotype: worker, Prov. Toliara, Tsimanampetsotsa, 6.7 km 130 SE Efoetse, 24º06′S, 43º46′E 25 m, 18–22.iii.2002 B.L. Fisher et al. BLF 6160/sifted litter, spiny forest/thicket/CASENT 0020507 6160(17) (California Academy of Sciences). Paratypes: Prov. Toliara (all specimens with same collection data as holotype): 3 workers (Australian National Insect Collection); 2 workers, 1 queen (The Natural History Museum); 2 workers (CAS); 2 workers, 1 queen (Museum of Comparative Zoology).
Etymology
Greek ‘xouthos’ (yellowish-brown) + ‘soma’ (neut. ‘body’)
References
References based on Global Ant Biodiversity Informatics
- Heterick B. 2006. A Revision of the Malagasy Ants Belonging to Genus Monomorium Mayr, 1855 (Hymenoptera: Formicidae). Proceeding of the California Academy of Sciences (PCAS) 57: 69-202