Camponotus gentingensis

Camponotus gentingensis
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Formicinae
Tribe:	Camponotini
Genus:	Camponotus
Species:	C. gentingensis
Binomial name
	Camponotus gentingensis; Dumpert, 1995 Specimen Labels

A Weaver Ant that uses silk in its nest construction.

Identification

A member of the subgenus Karavaievia. This group of Camponotus species is known for their monomorphic workers and their nest weaving behavior.

Dumpert (1995) - Camponotus gentingensis is one of the lightest Karavaievia species, together with Camponotus asli, Camponotus belumensis, and Camponotus micragyne. The worker ants of these species are predominantly yellowish brown. Typical for C. gentingensis is the distinctly lighter colour of the alitrunk compared with head and gaster. Different between C. asli and C. gentingensis is the significant larger and wider head of the worker ants. Corresponding differences are valid for the PW values. In contrast to C. belumensis and C. asli, the C. gentingensis-workers are not at all shining. The same holds for the females of these species which are shining in the case of C. asli and C. belumensis and opaque in the case of C. gentingensis.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Malaysia (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.

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.

Biology

General details about the biology of species in this subgenus can be found on the Karavaievia webpage.

Castes

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

gentingensis. Camponotus (Karavaievia) gentingensis Dumpert, in Dumpert, Maschwitz, et al., 1995: 94, Figs. 1, 2, 4, 5 (w.q.m.) WEST MALAYSIA.
- Status as species: Dumpert, Maschwitz & Weissflog, 2006: 78 (in key).

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

Description

Worker

Holotype: TL 5.9, HL 1.64, HW 1.68, CI 102, SL 1.8, SI 92, PW 1.0, OD 0.42.

Head trapezoidal with rounded occipital corners; occipital margin straight or slightly concave, head sides convex. Length of head reaches nearly HW (CI I 02). Eyes are situated behind the midlength of the sides of the head; their maximum diameter is 0.43 mm, or about 0.25 HW. Apart from a slight projection behind the scapal insertion, frontal carinae are straight, slightly divergent, and extended to about midlength of head. Anterior clypeal margin straight, neither protruded nor excised. Mandibles short, with lateral borders strongly curved and five subequal teeth on each masticatory border. Antennal scapes projecting beyond the occipital margin by about one third of their length. Pedicel longer than the following flagellar segments; apical flagellar segments slightly thickened.

Alitrunk with deep impression between promesonotum and propodeum, and two raised stigmata at the deepest point of the impression. Promesonotum, seen in profile, broadly rounded and higher than propodeum. Dorsal part of the propodeum slightly convex, descending part shorter and straight. Petiolar profile with broad base, which tapers to a transverse ridge. Petiolar ridge pointed while seen from front or behind.

Head, gaster, and legs uniformly brown, alitrunk yellowish, scapes and basal antennal segments dark brown. Surface of head, alitrunk and gaster opaque, covered with very dense punctures; cuticular structure under SEM strongly reticulated, stronger than in all other Karavaievia species except Camponotus orinus. Yellowish white decumbent pubescence scarce. Yellowish white, erect and suberect longer hairs occur mainly on forehead and vertex, less dense on alitrunk and gaster.

Paratype: TL 5.4 ± 0.2 (standard deviation), HL 1.4±0.15,HW 1.4±0.17,CI99.5±4.4,SL 1.81 ±0.12, SI 94.6 ± 3.4, PW 0.98 ± 0.09, OD 0.45 ± 0.03 (17 measured).

Queen

Gynetype: TL 11.3. HL 2.4, HW 2.5. CI 104. SL 2.38, SI 105, PW 2.0, OD 0.65 (alate female).

Head nearly as long as wide (CI 104); sides of the head convex, occipital corners rounded. occipital margin slightly concave. Eyes are situated behind the midlength of the sides of the head and relatively smaller than those of Camponotus striatipes (0.26 as against 0.4-+ x HW). Frontal carinae extend about to miJlength of the head. Apart from a lateral projection heyond the scapal insertion, they are almost straight and only slightly divergent. Anterior clypeal margin -as in all known Karavaievia- queens- with distinct semicircular excision. The edges of the excision indented. Frontal area weakly delimited and not at all shining. It is as dull or opaque as the surrounding head parts. Mandibles strong rounded on outside and with 5 subequal teeth on inside. Petiolar profile with broad base which tapers to a transvers ridge. Petiolar ridge rounded when seen from front or behind.

Head uniformly brown, alitrunk distinctly lighter, gaster and most parts of legs and antennae darker brown. Within the alitrunk, metanotum and borders of scutellum darker brown than the rest of alitrunk. Cuticular structure of head and alitrunk reticulated and not shining. Wings brownish, veins yellow brown. Body covered with short decumbent pubescence; longer erect and suberect hairs scarcely on the whole body, denser between the frontal carinae and on clypeus.

Paratypes: TL 11.5 ±0.2 (standard deviation), HL2.5 ± 0.05, HW 2.54 ± 0.04, CI 102 ± 0.001, SL 2.5 ± 0.06, PW 1.99 ± 0.03, 00 0.67 ± 0.01 (4 measured).

Male

Allotype: TL 6.5, HL 0.81, HW 0.85, CI 104.4, SL 0.95, SI 99.7, PW 1.57, OD 0.43.

Head trapezoidal and nearly as long as wide (CI 104.4 ). Eyes prominent and extending to the upper end of the head sides. Occipital margin strongly convex with protruding ocelli. Anterior clypeal margin straight. neither protruding nor excised. Short frontal carinae sinuate, reaching back to midlength of head. Eyes large; maximum diameter 0.43 mm or about 0.45 HW. Scapes long, projecting beyond occipital margin of the head by about half their length. Pedicel expanded at its distal end and thicker than following tlagellar segments. Propodeal profile rounded, with convex dorsal and weakly concave descending part. Petiolar scale triangular in profile, with broad base tapering to a ridge. Ridge with a deep median excision.

Colour uniformly reddish brown, with the exception of the yellow brown mandibles, clypeus and the adjacent parts of the cheeks and distal antennal flagellum. Cuticle of head, alitrunk, and gaster slightly shining with dense punctures, seen under the binocular, caused by a distinct reticulated cuticular structure. Decumbent pubescence on gaster, but nearly lacking on head and alitrunk (clear difference to Camponotus melanus); longer erect and suberect hairs scarce on head and even less dense on alitrunk and gaster.

Paratypes: TL 6.5 ± 0.01 (standard deviation); HL 0.85 ± 0.04; HW 0.8 ± 0.035; CI 105.0 ± 4.5; SL 1.0 ± 0.03; SI 89.8 ± 0.03; PW 1.12 ± 0.04; 00 0.43 ± 0.015 (6 measured).

Type Material

Holotype worker. Peninsular Malaysia, Selangor: Gombak Valley. ca. 25 km north of Kuala Lumpur, near Ulu Gombak Field Studies Centre of the University of Malaya, February/12/1992, U. Maschwitz leg. (Naturhistorisches Museum, Basel).

Paratypes: 17 workers with the same data as holotype (2 in Museum of Comparative Zoology at Harvard University; 2 Forest Research Institute of Malaysia (Forest Research Institute Malaysia, Kepong) in Kepong; 2 in Museo Civico di Storia Naturale. Genova; 11 in collection of the author).

Gynetype queen, Peninsular Malaysia, Selangor: Gombak Valley. ca 25 km north of Kuala Lumpur near Ulu Gombak Field Studies Centre of the University of Malaya, February/12/1992, U. Maschwitz leg. (Naturhistorisches Museum, Basel).

Paratypes: 4 queens with same data as gynetype (1 in Museum of Comparative Zoology at Harvard University; 1 in Naturhistorisches Museum, Basel; 1 in Forest Research Institute of Malaysia (FRIM) in Kepong, Malaysia; I in collection of the author).

Allotype male, Peninsular Malaysia, Gombak Valley, ca. 25 km north of Kuala Lumpur, near the U1u Gombak Field Studies Centre of the University of Malaya, February/12/1992, U. Maschwitz leg. (Naturhistorisches Museum, Basel).

Paratypes: 6 males with same data as allotype ( l Museum of Comparative Zoology at Harvard University; I Forest Research Institute of Malaysia (FRIM) in Kepong; 1 in Museo Civico di Storia Naturale, Genova; 3 in collection of the author).

Etymology

The name is derived from the fact that the first and hitherto only colony of this species was found near a street going to Genting Highlands.

References

Dumpert, K. 1995. Taxonomy. Pp. 88-102 in: Dumpert, K., U. Maschwitz, A. Weissflog, K. Rosciszewski, I. Hj. Azarae. Six new weaver ant species from Malaysia: Camponotus (Karavaievia) striatipes, C. (K.) melanus, C. (K.) nigripes, C. (K.) belumensis, C. (K.) gentingensis, and C. (K.) micragyne. Malaysian Journal of Science. Series A:Life Sciences 16:87-105. (page 94, figs. 1, 2, 4, 5 worker, queen, male described)