Discothyrea remingtoni

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The species is endemic to New Caledonia and only a few specimens have been found to date.

Discothyrea remingtoni
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Proceratiinae
Tribe: Proceratiini
Genus: Discothyrea
Species: D. remingtoni
Binomial name
Discothyrea remingtoni
Brown, 1948

Discothyrea remingtoni casent0172102 profile 1.jpg

Discothyrea remingtoni casent0172102 dorsal 1.jpg

Specimen Label

Identification

The nearest species of the genus in size is D. antarctica, which measures 2 mm., but D. antarctica is yellow throughout and has a differently shaped petiole. D. globa and D. clavicornis are much smaller and are described as having opaque integument; D. globa is red-brown throughout and D. clavicornis "flava"; both have differently shaped petioles. Mann described specimens of D. clavicornis from the Solomons as "rich brownish red." Since Emery's type is a unique and possibly teneral, it would be best to wait for further collecting before formally differentiating Mann 's specimens as a color race. Forel's D. sauteri from Taiwan (as Formosa) should be accorded at least subspecific rank on the basis of the description.

Distribution

Distribution based on Regional Taxon Lists

Australasian Region: New Caledonia (type locality).

G. Monteith and D. Cook found a couple more specimens in 9 May 1984 from a Berlasate of rainforest litter on Mt. Rembai at 700 meters elevation. 21°21′0″S 165°30′36″E / 21.35°S 165.51°E / -21.35; 165.51

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Found in rainforest leaf litter.

Castes

Known only from a few workers.

Nomenclature

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

  • remingtoni. Discothyrea remingtoni Brown, 1948c: 38, fig. 1 (w.) NEW CALEDONIA. See also: Brown, 1958g: 342.

Type Material

Description

Worker. Total length measured from anterior clypeal border of the extended head to the posteriormost point on the curved surface of gastric segment 11, 2.6 mm. Length of head alone, 0.80 mm.; Weber's length of thorax 0.73 mm. ; length of petiole, 0.19 mm. ; of raster, measured around the curve of the vault to the anteriorly directed last segmental apex, 1.24 mm. Head from the front broadly oval, cephalic index 88; broadest at about the posterior third of its length, with the sides somewhat converging and only slightly convex anteriorly; the posterior corners broadly rounded and passing easily into the evenly convex posterior border. Seen from the side, the posterior corners are evenly rounded. The structure of the frontal region and carinal plate much as in other Discothyrea species, the median ridge continuing upward to beyond the midlength of the head. Clypeus moderately projecting, broadly rounded anteriorly. A slight area above each antenna1 insertion on each side of the carinal plate very weakly impressed. Mandibles short, strong, convex, with knife-edged inner (masticatory) borders and acute apices. Antenna1 scapes massively clavate, their respective funiculi eight-jointed, the last joint exceptionally large and heavy. Eyes a little larger than most Discothyrea, with more than 12 and less than 18 ommatidia in each, situated just above the anterior quarter of the sides and a little toward the front or dorsal side of the head. Fig. 1. Discothyrea remingtoni new species, worker. A, petiole and adjoining segments in profile; B, antenna. Thorax not radically different from the usual run of Discothyea, rather stout, with blunt, rounded humeral angles ; epinotal teeth low and blunt, their bases extended down the sides of the epinotal declivity as low vertical lamellae. The teeth are located somewhat farther down the epinotal declivity than in Emery's figures of clavicornis in the Genera Insectoruni and in the original description of that species (1). The petiole is in the form of a thickened disc divided, in at least the dorsal half, by a transverse sulcus into anterior and posterior low, rounded rims, the central planes of which are parallel to each other, the anterior being slightly the larger of the two. Seen from the rear, the profile gives the effect of a semicircle within a concentric semicircle, the anterior rim being the outer semicircle and the posterior the inner. The posterior rim is truncate at its highestpoint, thus providing a collar for the reception of the base of the first gastric segment. The sulcus which runs around the dorsum ends halfway down the sides of the node described ; the median ventral keel is moderately prominent and bears a blunt process anteriorly. The gaster long, its second segment vaulted in the manner of most proceratiine ants and the undercurved apical segments directed anteriorly. The integument in general clearly shining through the dense pilosity, very sparsely and finely punctulate. The impressed spaces on each side of the median facial ridge coarsely and closely punctate, scarcely shining. Clypeus, carinal fusion process and antennae finely reticulatepunctate, subopaque to opaque. The entire body clothed densely with short suberect to erect whitish hairs, which are slightly shorter on the head and antennae, slightly more sparse on the legs. Head ferrugineous yellow, the gaster, mandibles and antennae somewhat lighter ; thorax rich mahogany- red, the petiole lighter; legs and tip of gaster medium yellow. Holotype: One worker deposited in the Museum of Comparative Zoology, No. 27788. Labelled "7 mi. S.E. La Foa, New Caledonia, Rocky Humus. March 11,1945 (C. L. Remington).

References