Discothyrea periyarensis

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Discothyrea periyarensis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Proceratiinae
Tribe: Proceratiini
Genus: Discothyrea
Species: D. periyarensis
Binomial name
Discothyrea periyarensis
Bharti, Akbar & Singh, 2015

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The type material was collected from a litter sample. The site had minimal sunlight exposure and very damp soil.

Identification

Bharti et al. (2015) - Among the known Oriental species Discothyrea periyarensis is close to Discothyrea bryanti but can be easily differentiated from it with following combination of characters: the frontal carinae extending posteriorly up to 1/2 length of head, anterior margin of clypeus not crenulate, cheeks without a prominent blunt tooth in front of the eyes, while in D. bryanti frontal carinae extending posteriorly to 2/3 length of head, anterior margin of clypeus crenulate, cheeks with a prominent blunt tooth in front of the eyes. The new species can also be easily separated from the Indian species (Discothyrea sringerensis and Discothyrea stumperi) on the basis of propodeal declivity more gradual, in lateral view, posterodorsal corner of propodeum rounded or very bluntly angled, forming an angle much greater than 90°, while in the latter species propodeal declivity abrupt, in lateral view, posterodorsal corner of propodeum narrowly to acutely toothed, forming an angle equal to or smaller than 90°. Some of the other additional characters by which the new species differs from Discothyrea sringerensis include: smaller size (TL 1.67, HL 0.73, HW 0.63) with smaller eyes consisting of 3–4 ommatidia, anterior margin of clypeus not crenulate, frontal carinae extending back about 1/2 the length of head and propodeum without distinct propodeal teeth, while the latter is larger in size (TL 3.05, HL 0.8, HW 0.54) with larger eyes consisting of 11–12 ommatidia, anterior margin of the clypeus crenulated, frontal carinae extending back about 2/3 the length of head and propodeum with distinct propodeal teeth. And Discothyrea periyarensis differs from D. stumperi Baroni Urbani, 1977 in having larger size (TL 1.67, HL 0.73, HW 0.63) and smaller eyes consisting of 3–4 ommatidia, posterodorsal corner of propodeum rounded to bluntly angled, forming an angle much greater than 90°, petiole scale like, much thicker with prominent subpetiolar process and mesosoma having humeral corners nearly rounded with lateral margins nearly straight, while the latter is smaller in size (TL 1.5, HL 0.53, HW 0.47) with larger eyes consisting of 10–12 ommatidia, posterodorsal corner of propodeum acutely toothed, forming an angle equal to or smaller than 90°, petiole compressed very thin, without any distinct subpetiolar process and mesosoma having distinct humeral angles with lateral margins strongly concave.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Oriental Region: India (type locality).

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.

  • periyarensis. Discothyrea periyarensis Bharti, Akbar & Singh, 2015: 122, figs. 1-6 (w.q.) INDIA.

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

Description

Worker

TL 1.67, HL 0.73, HW 0.63, CI 86.3, SL 0.44, SI 69.84, ED 0.04, PW 0.44, MSL 0. 81, PL 0.13, PH 0.31, DPW 0.29, LPI 238, DPI 223 (n = 1).

In full-face view, head longer than broad, roughly trapezoidal and narrowed anteriorly. Posterior margin nearly straight, posterolateral corners rounded. Sides evenly convex, notched in front of mandibular insertions. Mandibles triangular, masticatory margin edentate, apical tooth acute, small. Anterior margin of clypeus straight. Frontal lobes confused each other and formed a large roughly rhombic frontal area, distinctly longer than broad, anterolateral and posterolateral margins straight. Frontal carinae small and well separated, extending posteriorly to 1/2 of head-length. Antennae 10-segmented, apices of scapes reaching to 2/3 of distance from antennal sockets to posterolateral corners. Eyes small and convex, with 3–4 ommatidia on maximum diameter, located below the mid-length of sides. In posterior view, frontal area weakly elevated and roughly rhombic, with a broad base, anterior margin weakly convex, lateral corners acutely angled.

In lateral view, dorsum of mesosoma convex and sloping down posteriorly, promesonotal suture and metanotal groove absent. Posterodorsal corner of propodeum rounded or almost bluntly angled, forming an angle much greater than 90°, declivity weakly concave. Propodeal lobes large and rounded. Petiolar node short and low, scale like, dorsal face sloping down anteriorly and weakly concave, anterodorsal corner indistinct. Subpetiolar process prominent, bluntly angled ventrally. 1st gastral segment large, about 2/3 of the total length of gaster. Constriction between the two basal gastral segments broad and deep.

In dorsal view, mesosoma trapezoidal and narrowed posteriorly, humeral corners nearly rounded, lateral margins nearly straight, posterior margin concave medially. Petiolar node transverse and rectangular, anterior and posterior margins nearly straight, lateral and posterior margins also straight.

Mandibles finely punctured. Head, mesosoma, petiole, and 1st gastral segment densely and coarsely punctured, interface much smaller than puncture diameter.

Whole body covered with dense, suberect to subdecumbent short pubescence, without standing hairs; mandibles with few large hairs. Scapes and tibiae with dense decumbent short pubescence, without standing hairs.

Colour reddish brown. Apical antennal segments, legs, and gastral apex yellowish brown. Eyes black.

Queen

TL 2.01, HL 0.75, HW 0.67, CI 89.33, SL 0.5, SI 66.66, ED 0.13, PW 0.59, MSL 0.79, PL 0.16, PH 0.29, DPW 0.21, LPI 181, DPI 131 (n = 1).

Like workers with differences accepted for the caste including larger size; presence of 3 prominent ocelli; larger compound eye; large mesosoma and gaster.

Type Material

Holotype, worker: India, Kerala, Periyar Tiger Reserve, 9°46′N / 77°14′E, 1005 m a.s.l., 10.10.2011. Paratype: 1 gyne, same data as holotype, Winkler method (Coll. Shahid A. Akbar; det. H. Bharti and Shahid A. Akbar). Holotype and paratype in Punjabi University Ant Collection.

Etymology

The new species is named after its type locality.

References