Camponotus ramulorum

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Camponotus ramulorum
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Camponotus
Species: C. ramulorum
Binomial name
Camponotus ramulorum
Wheeler, W.M., 1905

Camponotus ramulorum casent0249347 p 1 high.jpg

Camponotus ramulorum casent0249347 d 1 high.jpg

Specimen Labels

Subspecies

Far and away the most abundant species of the genus on Andros and New Providence Islands. It is nocturnal and forms small colonies like those of C. marginatus, in the hollow twigs of trees or bushes and between the leaves of Tillandsias along the 'swashes' and “coppets.” Specimens from many colonies were collected in the following localities: Blue Hills, Fort Charlotte, and Hog Key near Nassau, N. P., and on all the keys that were visited along the Southern Bight and about Crawl Creek in western Andros. Some specimens collected by Prof. C. H. Eigenmann near Havana, Cuba, in a dried bean-pod, belong to this same variety. (Wheeler 1905)

Identification

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Bahamas (type locality), Cuba.

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.

  • ramulorum. Camponotus inaequalis var. ramulorum Wheeler, W.M. 1905b: 114, figs. S-U (s.w.q.m.) BAHAMAS. Combination in C. (Myrmoturba): Forel, 1914a: 267; in C. (Tanaemyrmex): Emery, 1925b: 82. Raised to species: Wheeler, W.M. 1913b: 503 (in text). Current subspecies: nominal plus marcidus, mestrei, vernulus.

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

Description

Worker

Major Length 6-7.5 mm.

Belonging to the maculatus group. Head about as long as broad, subtriangular, much narrower in front than behind, sides rounded, posterior border straight. Mandibles with seven teeth, which gradually increase in length towards the apex. Clypeus sharply carinate, produced into a broad lobe in front which is rounded on the sides and very faintly sinuate in the middle. Eyes large, flat, broadly elliptical, behind the middle of the head. Vertex with three small impressions simulating ocelli. Antennae rather robust, scape not compressed at the base, enlarging towards the tip, which surpasses by a little more than its transverse diameter the posterior corner of the head. Thorax rather robust, prothorax three fifths as broad as the head, meso- and meta-thorax laterally compressed; in profile the thorax is rather high, evenly arched as far back as the beginning of the epinotal declivity, which forms a very blunt angle with the basal epinotal surface and is of about the same length. Petiole convex in front and flattened behind, with a rather sharp border which is hardly excised in the middle. Gaster and legs of the usual shape.

Body shining, very finely shagreened. Mandibles, clypeus, and anterior two thirds of the head sparsely punctate.

Hairs yellow, very sparse, erect, absent on the legs and antennae, except at the tips of the scapes and femora. Each gastric segment has a single row of hairs along its posterior edge.

Yellow; mandibles reddish brown with black teeth. Head dark brown or black, especially on its upper surface, posterior corners yellow; the black portion extending back beyond the vertex in the form of a blunt point. Pronotum in the middle with a large dark brown or black triangular spot, broadest behind, sides with dark brown clouds; meso- and epinotum and pleurae spotted with black or brown. Gaster with a broad dark brown band across each segment; on the second and third segments this band suddenly narrows on either side. Petiole and legs yellow; tarsi and antennae reddish.

Minor Length 5-6 mm.

Head, excluding the mandibles, 1 1/2 times as long as broad, with slightly rounded sides, not narrower in front than behind; posterior margin straight. Mandibles 6-toothed. Clypeus and eyes like those of the worker major. Antennal scape projecting about 1/3 its length beyond the posterior corner of the head. Thorax very similar to that of the worker major; in front somewhat narrower than the head. Petiole narrower, more obtuse, and seen from behind with a more convex border than in the worker major.

Sculpture and pilosity as in the worker major. The head and thorax in some specimens are uniformly yellow or have only a few pale brown clouds on their dorsal surfaces. The brown bands on the gaster are paler and narrower than in the worker major.

Queen

Length 12-13 mm.

Resembling the worker major. The head is narrower and the antennal scapes project somewhat further beyond the posterior corners. Epinotum rounded, with short basal and abrupt and longer declivity. Node of petiole broad, rather blunt, with a transverse, faintly sinuate upper border.

Sculpture and pilosity as in the worker major. Mesonotum with a few piligerous punctures. Hairs on the thorax somewhat more abundant.

Sides of head more yellow than in the worker major. The mesonotum has a median, triangular, dark brown patch, broadest in front, and a dark cloud on either side. Scutellum and basal surface of epinotum dark brown; mesopleurae clouded with brown. Bands on the gastric segments very broad, especially in the middle. Wings yellowish hyaline, with yellow veins and brown stigma.

Male

Length 5-6 mm.

Head, including eyes and excluding mandibles, as long as broad, evenly rounded behind, narrower through the cheeks which are long and distinctly concave. Mandibles with a feeble tooth behind the apical tooth. Clypeus evenly rounded in front, convex and bluntly carinate in the middle. Antennae very long, slender. Thorax robust, mesonotum projecting upward and forward; epinotum convex, faintly angular in profile. Petiole low and thick, with a very blunt node. Genitalia small and very slender. Legs long.

Smooth and rather shining, very finely shagreened, the head somewhat more distinctly than the thorax.

Dark brown; edges of sclerites, intersegmental constrictions of gaster, mandibles, funiculi, and genitalia yellow or sordid. Wings as in the female.

References

  • Emery, C. 1925d. Hymenoptera. Fam. Formicidae. Subfam. Formicinae. Genera Insectorum 183: 1-302 (page 82, Combination in C. (Tanaemyrmex))
  • Forel, A. 1914a. Le genre Camponotus Mayr et les genres voisins. Rev. Suisse Zool. 22: 257-276 (page 267, Combination in C. (Myrmoturba))
  • Wheeler, W. M. 1905c. The ants of the Bahamas, with a list of the known West Indian species. Bull. Am. Mus. Nat. Hist. 21: 79-135 (page 114, figs. S-U soldier, worker, queen, male described)
  • Wheeler, W. M. 1913b. The ants of Cuba. Bull. Mus. Comp. Zool. 54: 477-505 (page 503, Raised to species (in text))