Carebara grandidieri

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Carebara grandidieri
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Carebara
Species: C. grandidieri
Binomial name
Carebara grandidieri
(Forel, 1891)

Carebara grandidieri casent0101813 profile 1.jpg

Carebara grandidieri casent0101813 dorsal 1.jpg

Specimen labels

Synonyms

Carebara grandidieri is a widespread, common species in the Malagasy region. Individuals and colonies have been collected from rotten logs, rotting tree stumps, soil, termite mounds, leaf litter, under moss, litter on rocks, under rotten logs, under stones, and in leaf litter. (Azorsa & Fisher, 2018)

Identification

Azorsa and Fisher (2018) - Antennae nine-segmented. Major: Head longer than wide, nearly rectangular, margins straight and parallel; petiole with relatively long peduncle, ventral face flat, petiolar node rounded. Minor: Head longer than wide, nearly subrectangular; petiole with relatively long peduncle, petiolar node rounded.

Carebara grandidieri is widely distributed throughout Madagascar, Comoros and Mayotte, and co-occurs with almost all Carebara species recorded in the Malagasy region. The morphology of this species is highly variable a) pilosity that varies from suberect to decumbent hairs, and is more noticeable on the gaster; b) posterior corner of propodeum, which varies from a pair of small triangular and angulate upwardly directed teeth, to nearly convex (in specimens from the same colony it is possible to see the gradual change from nearly convex to slightly dentate); c) petiole, where the node is thicker in profile and dorsal view, in some populations; and d) the diameter of the propodeal spiracle, which is smaller in populations from the north of Madagascar.

In the Malagasy region there are only two species of Carebara with nine antennal segments: C. grandidieri and Carebara creolei. Carebara creolei is present only in Comoros and the Seychelles. All other Carebara species present in Madagascar have 10 or 11 antennal segments.

The queen of C. grandidieri can be separated from others by the following combination of characters: head longer than wide, in full-face view nearly rectangular, or nearly subquadrate, posterior margin of head slightly concave in the middle, posterolateral corners rounded; lateral margins straight to slightly convex; mandible with six or seven teeth; anterior margin of clypeus slightly concave; antennae with nine segments; ocelli present, eyes present.

Keys including this Species

Distribution

Azorsa and Fisher (2018) - Madagascar, Comoros and Mayotte. This species was collected in the following environments: along the roadside, coastal scrub, dry forest, gallery forest, grassland, littoral forest, montane rainforest, open secondary vegetation, rainforest, spiny forest/thicket, tropical dry forest, Uapaca woodland, and urban/garden. C. grandidieri was sampled at elevations ranging from 10 m to 1550 m.

Distribution based on Regional Taxon Lists

Afrotropical Region: Comoros.
Malagasy Region: Madagascar (type locality), Mayotte.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • grandidieri. Oligomyrmex grandidieri Forel, 1891b: 201 (q.) MADAGASCAR.
    • Forel, 1895c: 250 (m.).
    • Combination in Carebara: Fernández, 2004a: 235.
    • Senior synonym of voeltzkowi: Azorsa & Fisher, 2018: 58.
  • voeltzkowi. Oligomyrmex voeltzkowi Forel, 1907g: 77 (q.) MADAGASCAR.
    • Combination in Carebara: Fernández, 2004a: 235.
    • Junior synonym of grandidieri: Azorsa & Fisher, 2018: 58.

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

Description

Worker

Azorsa and Fisher (2018) - Major. (n=22): HL 0.56–0.84; HW 0.44–0.61; SL 0.25–0.32; ML 0.12–0.21; EL 0.01–0.03; EM 0.14–0.19; HD 0.30– 0.45; WL 0.51–0.74; PSL 0.05–0.09; PW 0.26–0.38; MFL 0.29–0.42; MFW 0.06– 0.10; MTL 0.26–0.37; PTL 0.18–0.28; PNL 0.09–0.14; PTH 0.12–0.20; PTW 0.12–0.19; PPL 0.11–0.16; PPNL 0.09–0.14; PPH 0.10–0.17; PPW 0.13–0.21; GL 0.44–0.85; GW 0.35–0.65; CI 71–79; MI 20–27; SI 38–46; MLI 63–74; PPLI 50– 67; PPI 100–123; PSI 10–15.

Head longer than wide (CI 71–79), in full-face view nearly subrectangular, about 1.3 times longer than wide. Posterior margin of head medially concave, posterolateral corners rounded, lateral margins straight. Mandibles with six teeth. Anterior margin of clypeus concave and laterally convex. Frons without median ocellus. Antennae with nine segments. Scapes short (HL 0.56–0.84, SL 0.25–0.32, SI 38–46). Eyes present, consisting of one to three ommatidia (EL 0.01–0.03). Supraclypeal area acutely triangular, extending forward beyond the antennal insertions.

In profile view, promesonotum convex, mesonotum shallowly present and lower than dorsum of promesonotum, metanotal groove present. Propodeum lower than promesonotum, about 1.2 times higher than long, dorsal face of propodeum nearly flat and declining posteriorly, posterodorsal corner angulate to dentate, declivity of propodeum slightly concave with thin lateral laminae in direction of propodeal lobe. Propodeal lobes short and convex. Propodeal spiracle rounded and situated above mid-height of sclerite, and beyond mid-length of sclerite by about half the diameter of the spiracle; distance from propodeal spiracle to posterodorsal corner of propodeum about 2.5 times the diameter of the spiracle (PSL 0.05–0.09), and distance to declivity almost twice the diameter of the spiracle. In dorsal view, promesonotum about 1.2 times longer than wide, anterior margin of promesonotum rounded, sides convex and narrowed posteriorly; sides of propodeum weakly convex or straight.

Petiole with relatively long peduncle, ventral face flat. Combined outline of dorsal surface of peduncle and anterior face of node deeply concave in the middle, posterior face of node slightly convex, anterodorsal and posterodorsal corner convex, dorsum rounded. Subpetiolar process produced as a small denticle, smaller than the diameter of the propodeal spiracle. Postpetiolar node rounded and lower than petiolar node. In dorsal view, petiolar node as broad as postpetiolar node (PTW 0.12–0.19, PPW 0.13–0.21) and petiolar node wider than long (PNL 0.09–0.14, PTW 0.12–0.19), anterior and posterior margins of petiole nearly straight, anterior margin of postpetiole concave and convex posterior margin, sides rounded in petiole and convex in postpetiole, narrowed posteriorly.

Dorsal surface of mandibles, upper median portion of clypeus and supraclypeal area smooth and shiny, with scattered piligerous punctae on head and mandibles. Head with longitudinal rugae along the gena, and frontal lobes. Lower median portion of clypeus with transverse rugae. In profile, posterolateral portion of cephalic dorsum smooth and shiny. Mesosoma smooth and shiny, except for propleuron and mesopleuron (areolate), and metapleuron (longitudinally rugulose). Ventral face of petiole and postpetiole longitudinally areolate. In dorsal view mesosoma, petiole, postpetiole and gaster smooth and shiny, except for declivity of propodeum, anterior and posterior face of petiole finely areolate.

Lateral margins and posterior margin of head with suberect to subdecumbent hairs. Scapes with subdecumbent to decumbent hairs. Outer margin of mandibles with short decumbent hairs. Mesosoma with short and long suberect hairs. Petiole and postpetiole with short subdecumbent hairs and long suberect hairs. Tibia with subdecumbent to decumbent hairs. Gaster with abundant suberect to decumbent hairs. Color yellowish ferruginous.

Minor. (n=18): HL 0.39–0.49; HW 0.31–0.40; SL 0.23–0.30; ML 0.08–0.13; EL 0.01–0.02; EM 0.11–0.13; HD .022– 0.28; WL 0.40–0.52; PSL 0.03–0.05; PW 0.18–0.24; MFL 0.24–0.31; MFW 0.06– 0.08; MTL 0.19–0.27; PTL 0.16–0.19; PNL 0.09–0.11; PTH 0.10–0.13; PTW 0.09–0.11; PPL 0.08–0.11; PPNL 0.07–0.10; PPH 0.07–0.10; PPW 0.10–0.12; GL 0.31–0.55; GW 0.22–0.32; CI 79–86; MI 19–28; SI 57–65; MLI 73–82; PPLI 47– 63; PPI 100–120; PSI 9–13.

Head longer than wide (CI 79–86), in full-face view nearly subrectangular, about 1.2 times longer than wide. Posterior margin of head weakly concave, nearly straight, posterolateral corners rounded, lateral margins slightly convex, nearly straight. Mandibles with five teeth. Anterior margin of clypeus concave and laterally angulate. Antennae with nine segments. Scape fails to reach the posterior margin of head (HL 0.39–0.49, SL 0.23–0.30, SI 57–65). Eyes present, consisting of one ommatidium (EL 0.01–0.02). Supraclypeal area triangular but poorly defined.

In profile view, promesonotum weakly convex, nearly flat, metanotal groove present. Propodeum about 1.3 times higher than long, dorsal face of propodeum convex, posterodorsal corners angulate, or with a small triangular tooth, anterodorsal corner convex, declivity concave with thin lateral laminae in direction of propodeal lobe. Propodeal lobes short and triangular. Propodeal spiracle rounded and situated above mid-height of sclerite by about two times the diameter of the spiracle, and beyond mid-length of sclerite by about 1.5 times the diameter of the spiracle, distance from propodeal spiracle to posterodorsal corner of propodeum almost three times the diameter of the spiracle (PSL 0.03–0.05), and distance to declivity less than twice the diameter of the spiracle. In dorsal view, promesonotum about 1.25 times longer than wide, anterior margin rounded, sides convex; sides of propodeum straight.

Petiole with a relatively long peduncle, petiole longer than high (PTL 0.16–0.19, PTH 0.10–0.13), ventral face flat. Combined outline of dorsal surface of peduncle and anterior face of node deeply concave in the middle, posterior face of node slightly convex, anterodorsal and posterodorsal corner convex, dorsum rounded. Subpetiolar process produced as a small denticle, smaller than the diameter of the propodeal spiracle. Postpetiolar node strongly convex and lower than petiolar node. In dorsal view, petiolar node almost as broad as postpetiolar node (PTW 0.09–0.11, PPW 0.10–0.12), and petiolar node as broad as long (PNL 0.09–0.11, PTW 0.09–0.11), anterior and posterior margin of petiole convex, anterior margin of postpetiole concave and convex posteriorly, sides of petiole and postpetiole strongly convex.

Dorsal surface of mandibles, clypeus, supraclypeal area, and head smooth and shiny, with scattered piligerous punctae on head and mandibles. Head with transverse rugae near the posterior margin of head, gena and frontal lobes with longitudinal rugae. Mesosoma smooth and shiny, except for propleuron and mesopleuron (areolate), and metapleuron (finely areolate-rugose). Lateral margins of petiole finely areolate-rugose, except for petiolar node and ventral face of postpetiole which are areolate. In dorsal view mesosoma, petiole, postpetiole and gaster smooth and shiny, except for declivity of propodeum, anterior and posterior face of petiole which are finely areolate.

Lateral margins of head and scape with subdecumbent to decumbent hairs. Posterior margin of head with short suberect hairs. Outer margin of mandibles with decum bent hairs. Mesosoma with short and long suberect hairs. Petiole and postpetiole with short decumbent hairs and long subdecumbent hairs. Tibia with decumbent hairs. Gaster with longer suberect to decumbent hairs. Color yellowish ferruginous.

Type Material

Azorsa and Fisher (2018) - Holotype queen (1 queen, CASENT0101999), (Musee d'Histoire Naturelle Genève) [examined]: Madagascar, Antananarivo (Camboué).

References

  • Azorsa, F., Fisher, B.L. 2018. Taxonomy of the ant genus Carebara Westwood (Formicidae, Myrmicinae) in the Malagasy Region. ZooKeys 767: 1–149 (doi: 10.3897/zookeys.767.21105).
  • Fernández, F. 2004a. The American species of the myrmicine ant genus Carebara Westwood (Hymentoptera: Formicidae). Caldasia 26(1): 191-238 (page 235, Combination in Carebara)
  • Forel, A. 1891c. Les Formicides. [part]. In: Grandidier, A. Histoire physique, naturelle, et politique de Madagascar. Volume XX. Histoire naturelle des Hyménoptères. Deuxième partie (28e fascicule). Paris: Hachette et Cie, v + 237 pp. (page 201, queen described)
  • Forel, A. 1895d. Nouvelles fourmis de l'Imerina oriental (Moramanga etc.). Ann. Soc. Entomol. Belg. 39: 243-251 (page 250, male described)
  • Wheeler, W. M. 1922k. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. IX. A synonymic list of the ants of the Malagasy region. Bull. Am. Mus. Nat. Hist. 4 45: 1005-1055 (see also)