161 Works

Description of the male genitalia of Pristomyrmex punctatus (Smith, 1860) (Hymenoptera, Formicidae, Myrmicinae)

Aiki Yamada &
Pristomyrmex punctatus (Smith, 1860) is a parthenogenetic ant species. Colonies are usually composed of workers only, or rarely of workers and a few ergatoid queens. Workers and ergatoids reproduce thelytokously, however colonies containing alate males are often found. The habitus of the body of P. punctatus has already been observed and described by previous authors. In the present study, a detailed description of the male genitalia is provided.

Review of the Crematogaster popohana-group with the description of a new species from the Indochinese Peninsula (Hymenoptera: Formicidae)

Shingo Hosoishi & Kazuo Ogata
The Crematogaster popohana-group is reviewed and two species and one subspecies, including one new species, C. fumikoae sp. nov. are recognized. The C. popohana-group is distinguished from other Asian Crematogaster- species by the slender petiole with weakly convex sides. A key to the species based on the worker caste is also provided. Morphological features of the unique slender petiole are discussed.

Diversity and richness of ant species in a lowland wet forest reserve in Sri Lanka

, Jonathan D. Majer & Jayanthi P. Edirisinghe
Sinharaja Forest Reserve (SFR) represents one of the largest remaining stands of mixed dipterocarp forest in southwestern Sri Lanka. It is characterised by high floral and faunal endemicity and is gazetted as a World Heritage Site. Research was undertaken to study the ground-dwelling ants in the SFR using pitfall traps and leaf litter extraction. The collection was carried out in disturbed and undisturbed primary forest, old selectively-logged forest (30 years old) and periphery forest (agricultural...

An analysis of declining ant species richness with increasing elevation at Mount Kinabalu, Sabah, Borneo

Annette K.F. Malsch, Brigitte Fiala, Ulrich Maschwitz, , &
his study investigated factors responsible for the decline of ant species richness with increasing elevation in an evergreen tropical rain forest on Mount Kinabalu. From 580 m to 1520 m a.s.l. we studied the ant community as well as biotic and abiotic factors in parallel on the ground and in the lower vegetation with various methods. We collected a total of 376 ant morphospecies, belonging to 65 genera and 8 subfamilies. The decline of ant...

On the identity of Crematogaster schimmeri Forel, 1912 and the distribution of subgenus Decacrema in Asia (Hymenoptera: Formicidae)

Shingo Hosoishi & Kazuo Ogata
Taxonomy of Crematogaster species is confounded by intra- and inter-specific variation. Although most recent taxonomic works on ants avoid subgenus classification, for Crematogaster we follow the traditional subgenus framework as a working hypothesis, a recognised approach to solving taxonomic problems in such a huge group.

A new species of the ant genus Aphaenogaster Mayr (Hymenoptera: Formicidae) from Iran

Kadri Kiran, Helen Alipanah & Omid Paknia
A new species, Aphaenogaster iranica Kiran et Alipanah, sp. nov., is described from Iran. This species, belonging to the rothneyi group, is measured, illustrated and compared with other species of the group. Additionally, a key to workers of Aphaenogaster species from Iran is prepared.

Ant species richness, endemicity and functional groups, along an elevational gradient in the Himalayas

, , Meenakshi Bharti & Martin Pfeiffer
In this study we investigate variation in species density, species richness, abundance and functional-groups composition along an elevational gradient in Jammu-Kashmir Himalaya. We tested the hypotheses that (1) species richness and abundance decrease with increase in elevation with respect to temperature change, and (2) assemblage composition changes with an increase in elevation with respect to functional-group composition. We employed different sampling methods like pitfall traps, leaf-litter sifting, stick beating, soil cores, honey baits and hand...

Ant community variation in urban and agricultural ecosystems in Vadodara District (Gujarat State), western India

Dolly Kumar & Archana Mishra
Studies on ant communities of India are sparse and needed. This is the first comprehensive survey of ant communities from the Vadodara district located in the central part of Gujarat, India (west coast of the Indian Peninsula). The present study was undertaken to (i) assess ant diversity and density changes along a habitat gradient and (ii) establish the species composition of ant communities in urban and agricultural ecosystems. Study sites comprised (a) agricultural ecosystems, which...

Diversity and biogeography of ants in Mongolia (Hymenoptera: Formicidae)

, , Seiki Yamane & Martin Pfeiffer
Information on the biogeographical composition and spatial distribution patterns of ant assemblages in Mongolia is relatively scarce. In this study we investigated species richness, spatial distribution and biogeographical composition of the Mongolian ant fauna and recorded a total of 71 species belonging to 17 genera and three subfamilies. Genus and species richness of ants is lower in Mongolia than in most surrounding geopolitical regions. Using published literature as well as our own data we examined...

The effectiveness of weaver ant (Oecophylla smaragdina) biocontrol in Southeast Asian citrus and mango

Joachim Offenberg, &
Oecophylla ants may protect tropical plantation crops against pests. Cost-benefit studies comparing ant-based protection with conventional methods are needed to assess whether it is economically viable. Here we contrast profits in ant- and chemically-protected plots in a Thai and a Vietnamese citrus plantation and in a Thai mango plantation. In Thai pomelo and Vietnamese mixed pomelo/orange, ants and chemical pesticides lead to equal fruit yields. Lower costs in ant treatments, though, generated profit gains of...

Lasius elevatus, a new ant species of the subgenus Cautolasius (Hymenoptera: Formicidae) from the Indian Himalayas

& Irfan Gul
A new species of the formicine ant genus Lasius, viz Lasius elevatus sp. nov., is described from the Indian Himalayas. This is the third species of the subgenus Cautolasius known from the Himalayas, with L. alienoflavus Bingham, 1903 and L. talpa Wilson, 1955 reported earlier. A key is provided for the 13 species reported from this region.

Impacts of forest fragmentation on the genetic diversity and population structure of Pachycondyla obscurans in Sabah, Malaysian Borneo

Noel Tawatao, Neil E. Harper, , , Jeremy B. Searle & Jane K. Hill
The impact of forest fragmentation on genetic diversity of Pachycondyla obscurans, a predatory forest-specialist ant species, was investigated in six forest locations using Amplified Fragment Length Polymorphism (AFLP) fingerprinting. There was little difference in genetic diversity between three large forest locations (two locations in continuous forest, plus one 120,000 ha fragment) and three small forest fragments (151–320 ha). Populations from two locations approximately 60 km apart in continuous forest showed little genetic differentiation, but genetic...

Worker ant community observed by repeated sampling and information on endemic Aneuretus simoni Emery in the Gilimale Forest Reserve in Sri Lanka

The ant community of Gilimale Forest Reserve in Sri Lanka is of special interest as a habitat of the island-endemic Aneuretus simoni. Ant community composition and aspects of A. simoni ecology in this forest were investigated using multiple sampling methods simultaneously, on six visits to Gilimale from February to December 2004. Daytime sampling of ants was carried out along ten 100 m transects by honey and canned-fish baiting, leaf litter and soil sifting, hand collection,...

Frequency of nest occurrence and nest density of Aneuretus simoni Emery (Sri Lankan Relict Ant) and other ant fauna in an abandoned rubber plantation (Kirikanda Forest) in southwest Sri Lanka

, , &
Aneuretus simoni Emery, a critically endangered ant species endemic to Sri Lanka, was studied in Kirikanda Forest in Kalutara District. The nest occurrence and nest density of ant species was investigated using 240 quadrats (0.5 m x 0.5 m), in six 100 m2 plots, on 15 January, 5 May and 24 July 2010, and recording the number of ground nests belonging to any ant species within each quadrat. Fallen twigs and decaying wood pieces within...

The ant genus Crematogaster Lund, subgenus Physocrema Forel, in the Indochinese Peninsula (Hymenoptera: Formicidae)

Shingo Hosoishi & Kazuo Ogata
Indochinese species of the genus Crematogaster Lund, 1831 subgenus Physocrema Forel, 1912 are reviewed. Four species are recognised in the region. Two taxa formerly treated as subspecies of difformis, C. (P.) physothorax Emery, 1889 and C. (P.) sewardi Forel, 1901, are raised to species level. An identification key to species in the region is presented.

The northern-most record of Leptanillinae in China with description of Protanilla beijingensis sp. nov. (Hymenoptera: Formicidae)

Pei Man, Hao Ran, &
Protanilla beijingensis sp. nov. from Beijing, China, is described. The distribution of the new Protanilla species is further north than that of any other species in the genus. This also represents the first record of a Leptanillinae species from Palaearctic China. By means of a subterranean pitfall trap (between 30 and 55 cm below ground), we made a collection of three workers and one queen of P. beijingensis sp. nov. and 106 individuals of Leptanilla...

New synonymy and redescription of Anochetus mixtus Radchenko, 1993, and distinction from the other members of the Anochetus rugosus group (Hymenoptera: Formicidae: Ponerinae)

, & Katsuyuki Eguchi
Anochetus yunnanensis Wang, 1993 is recognized as a junior synonym of Anochetus mixtus Radchenko, 1993, and the queen and male of Anochetus mixtus are described for the first time. In addition, male genitalia of A. princeps, A. rugosus and A. mixtus are described. The present study suggests the morphology of the male genitalia and associated sclerites may be useful for discriminating among Anochetus species in which the workers are largely indistinguishable.

Evidence of predation in two species of the Colobopsis cylindrica group (Hymenoptera: Formicidae: Camponotini)

Herbert Zettel, Alice Laciny, , , Alexey Kopchinskiy & Irina S. Druzhinina
The complex ecology and nutrition of “exploding” ants of the Colobopsis cylindrica group (COCY) is still poorly understood. Hitherto, this group of ants was thought to feed mainly on phylloplane biofilms with only scarce observations of carnivorous behaviour. This study focusses on observations and behavioural experiments conducted on Colobopsis badia and Colobopsis leonardi, two species native to Thailand. In experiments with C. leonardi, we investigated recognition and acceptance of diverse arthropod prey, as well as...

Taxonomy of the Leptogenys chalybaea species group (Hymenoptera, Formicidae, Ponerinae) from Southeast Asia

& Seiki Yamane
Leptogenys atra sp. n., L. chalybaea, and L. cyanicatena sp. n. are described from Southeast Asia. These three species are distinguished from other congeners by their eye position and the shapes of the clypeal median lobe and petiolar node. The L. chalybaea species group is proposed based on the similarity of these three species. A key to the species in this group is provided. Colonies of this group contain many ergatoid queens, of which virgin...

Colony composition, brood production and caste dimorphism in two species of the doryline genus Lioponera in the Oriental tropics (Formicidae: Dorylinae)

, , &
Recent phylogenetic research indicates that the true army ants (e.g. Aenictus, Dorylus, Eciton, Neivamyrmex) belong to the subfamily Dorylinae, together with several non-army ant genera such as Cerapachys, Yunodorylus, Lioponera and Ooceraea. Thus, comparative studies among doryline genera are very important for understanding the biological characteristics of true army ants. We investigated colony composition of two species of the Lioponera suscitata group in the field and in the laboratory in Indonesia, Malaysia, and Thailand. In...

Redescription of Aphaenogaster muschtaidica Emery, 1908 with a key to gibbosa species group

Sebastian Salata & Lech Borowiec
Aphaenogaster muschtaidica Emery, 1908 n. st. is redescribed based on new material collected from Georgia. A neotype of this species is designated. Its sexual forms are described for the first time. Features defining members of A. gibbosa group are redefined and a status of Aphaenogaster subterranea fiorii Emery, 1915 n. comb. is recombined. A key to worker caste of species belonging to gibbosa group is given.

Flight muscle histolysis in Lasius niger queens

Arthur Matte & Johan Billen
T. The foundation of new ant colonies often involves a solitary phase for the newly mated queens. These queens are subject to high food stress during this period that can last several weeks or months until the appearance of the first workers. The food stress is mainly associated with egg laying, larval feeding, and the queens’ own metabolism. The flight muscles of ant queens are histolyzed during early colony foundation, a process that was first...

Morphology and ultrastructure of Pavan’s gland of Aneuretus simoni (Formicidae, Aneuretinae)

Johan Billen & Sebastiaan Verbesselt
Workers of Aneuretus simoni have a well-developed Pavan’s gland, which is the exocrine character that makes the Aneuretinae and Dolichoderinae sister groups. The secretory epithelium of the gland consists in both minor and major workers of an anterior and a posterior part, which makes them different from the Dolichoderinae where the gland is formed by a single part only. At the ultrastructural level, the secretory cells are characterized by a very prominent smooth endoplasmic reticulum,...

A review of the nesting habits and socioecology of the ant genus Polyrhachis Fr. Smith

Simon K.A. Robson & Rudolf J. Kohout
We provide a summary of the nesting and socioecological habits of 197 species of Polyrhachis ants. Nesting habits range from subterranean to terrestrial, lignicolous, lithocolous and arboreal with varying levels of consistency at the subgeneric level. Species are predominantly either subterranean or terrestrial nesting within the subgenera Campomyrma, Chariomyrma and Hagiomyrma; mainly arboreal nesting within Aulacomyrma, Cyrtomyrma, Hedomyrma, Hemioptica, Myrmatopa and Myrmothrinax; lignicolous within Hedomyrma, and variable within Myrma, Myrmhopla and Polyrhachis. The majority of...

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