Muscleman tree ants : Podomyrma ants

Morphology and Identification

Podomyrma ants boast distinctive features. Their antennae, consisting of 11 segments, set them apart. The petiole and postpetiole exhibit unique characteristics, appearing either low and rounded or barrel-shaped. Notably, the petiole may bear one to three small spines or teeth. The middle and hind legs showcase markedly swollen femora and often tibiae. These morphological traits serve as key identifiers within the Myrmicinae subfamily.

Habitat and Behavior

Podomyrma occupy solid dead wood, beetle burrows, cracks in trunks, twigs, vines, mangroves, large seeds, galls, and occasionally, the ground. Foraging primarily occurs on tree trunks, around tree bases, in litter, and on grasses, especially during evenings. Despite their potential abundance, these ants often elude detection due to their arboreal tendencies.

Research indicates that Podomyrma ants typically form medium-sized colonies, with over 200 individuals. Nesting both underground and arboreally, these ants exhibit omnivorous behavior and cooperative foraging.

Ant raiding ants : Lioponera ants raid other ants

 

Lioponera, a genus within the Hymenoptera order, Formicidae family, and Dorylinae subfamily, is characterized by its diverse range of 76 species. Established by Mayr in 1879, the genus's type species is Lioponera longitarsus.

Identification

Workers of Lioponera exhibit distinct features, including a unique cuticular flange on the hind coxa, dorsolateral margination on at least the anterior half of the petiole, and a specific development of the metatibial gland. Male characteristics include 13-segmented antennae and the absence of the costal vein (C) in the fore wing.

Biology

Lioponera species are predatory, often preying on other ants. In Australia, there's evidence of a preference for Pheidole, while in Japan, some species target Monomorium. Behavioral observations suggest a non-phasic reproductive cycle, with queens continuously laying eggs, and varied brood stages coexisting in a colony.

Distribution and Habitat:

With diverse habitats ranging from soil and under stones to rotting logs and hollow twigs, Lioponera nests are adaptable. The genus is found in different regions, and keys for species identification are available for the Afrotropical region, southwestern Australian Botanical Province, and New Caledonia.

While the mean colony size remains unknown, Lioponera colonies are not parasitic, with nesting sites both hypogaeic and arboreal. As predators, they forage on the ground.

Nasutitermes walkeri: The Tree Termite of Eastern Australia

Note an ant, but also an interesting social insect, Nasutitermes walkeri, commonly known as the cone-headed tree termite, is a fascinating species of arboreal termite native to eastern New South Wales and southeastern Queensland, Australia. The soldiers of Nasutitermes walkeri are easily recognizable by their syringe shaped heads and yellowish-brown bodies usually with a darker head. Measuring between 5 and 7 mm (0.20 and 0.28 in) in length, these termites play a crucial role in the ecology of their habitat.

Distribution and Habitat

Endemic to eastern Australia, Nasutitermes walkeri is primarily found in eastern New South Wales and southeastern Queensland. This species thrives in diverse environments, ranging from mountains to coastal regions, particularly in scrublands and wooded areas. The adaptability of Nasutitermes walkeri to various habitats is a testament to its resilience and ability to establish colonies in different ecological niches. Initially, colonies are established in the crowns of trees, taking advantage of sites with timber damage from fire or decay. As the colony matures, a more substantial nest is constructed higher up in the tree, sometimes reaching heights of 20 meters (66 feet) above the ground.

The nests exhibit a thin, papery surface on the outside, while the internal structure is fragile. This fragility is a unique feature that sets Nasutitermes walkeri apart from other termite species. The termites primarily feed at ground level, creating tubes down the tree trunk. Additionally, they construct surface tubes and subterranean passages through the soil to access wood for sustenance.

Ecological Relationships

Nasutitermes walkeri plays a vital role in its natural habitat, aiding in the decomposition of dead wood and contributing to nutrient cycling.

The nests of Nasutitermes walkeri, often found on ironbark, stringybark and gum trees, serve as nesting sites for other wildlife, including kingfishers. This unique ecological relationship highlights the interconnectedness of species in the ecosystem, with Nasutitermes walkeri contributing to the availability of nesting locations for other organisms.

Meranoplus - Shield Ants from Australia

Meranoplus is a diverse genus of over 80 species thriving in the Old World tropics. The African species of this genus exhibit a penchant for nesting in the ground, decaying wood, or beneath stones. Their foraging activities primarily occur on the ground or within leaf litter, although a select few may venture onto trees or shrubs.

Biology

Meranoplus ants can be either omnivorous, opportunistically consuming seeds, or specialized granivores. When disturbed, they fake death by retracting their antennae, tucking their legs under the promesonotal shield, and remaining perfectly motionless.

Identification

Meranoplus ants have a compact mesosoma that is dorsolaterally and often posterodorsally produced. Another defining trait is the nine-segmented antenna with a three-segmented club.

More detail on Myrmecofourmis.fr (fr),

The Maricopa Harvester Ant (Pogonomyrmex maricopa) - granivorous ants from Arizona

The Maricopa harvester ant, scientifically known as Pogonomyrmex maricopa, holds a significant presence in the United States, primarily in Arizona. However, its habitat extends beyond, encompassing regions in California, Colorado, New Mexico, Nevada, Texas, Utah, and various Mexican states like Baja California, Chihuahua, Sinaloa, and Sonora. These ants have the most potent insect venom globally.

Nest Construction and Adaptation

Maricopa harvester ants exhibit distinctive nesting behaviors. Their mounds incorporate rocks and gravel, particularly in fine sand dune areas. The nests feature cemented caps, composed of approximately 60% calcium carbonate transported from underlying layers. These caps serve a crucial role, protecting the nests from erosion during high-wind periods. Interestingly, the partial erosion of these caps contributes to the calcium carbonate content in the surrounding sand dune soils.

Identification

Workers within this population exhibit variations, with some having an unarmed epinotum and others featuring angles or short spines. The closest relative to Pogonomyrmex maricopa is believed to be Pogonomyrmex californicus. Differences in cephalic and thoracic sculptures, rugosity, and coloration aid in distinguishing the two species. While maricopa workers have closely spaced, fine cephalic rugae, californicus workers exhibit widely spaced, coarse rugae. The thoracic dorsum of maricopa is generally more uneven, and the sides of the epinotum bear distinct punctures, unlike the smooth and shining epinotum of californicus

More info on the taxonomy of this species is available on AntWiki.

Lasius fuliginosus: The Jet Ant that smells like lemon

Lasius fuliginosus, commonly known as the jet ant or jet black ant, is a species belonging to the subfamily Formicinae.

Distribution

This ant species is widespread across Europe and Asia, inhabiting regions from Portugal and Ireland to Finland in the north, Italy in the south, and extending eastwards to Korea and Japan. In the UK, it is primarily found south of The Wash, in East Anglia, Southern England, and occasionally in Ireland.

Morphology

Workers of Lasius fuliginosus boast a distinctive black shiny color, a relatively large head with rounded occipital lobes, and brownish-yellow legs. Queens, larger than workers, share the black shiny color but possess a heart-shaped head and more abundant body hairs. Males, with suberect hairs, are smaller in size.

Behavior of Lasius fuliginosus

To convey alarm, these ants dispense dendrolasin, a terpenoid compound, from their mandibular glands. They form a fascinating association with the nitidulid beetle Amphotis marginata, known as the "highwayman." These beetles exploit ants returning to the nest by tricking them into regurgitating food, engaging in a clever tactic known as trophallaxis.

Habitat

Lasius fuliginosus constructs unique "cardboard" nests in old hollow trees using a mixture of chewed wood and saliva, resembling the habits of termites. A single nest houses one queen, but larger colonies can include up to 15,000 workers. These ants tend aphids for honeydew and establish large scent trails for efficient foraging, clearing paths for months.

Reproduction and parasitic foundation

Unlike some black ant species, Lasius fuliginosus employs social parasitism for reproduction. The post-nuptial queen invades nests of another ant species, Lasius umbratus, kills or ousts the existing queen, lays eggs tended by the host workers, and gradually takes over the nest.

Acrobat Ants and their Stinger | Crematogaster from Australia

Crematogaster is a globally distributed genus of ants. Crematogaster species are arboreal ants dwelling in trees. These ants feed on a variety of insects, employing venom to subdue prey. Termed "acrobat ants" for their ability to raise abdomens forward and over their thoraces, these ants deploy defensive mechanisms when faced with conflict. Venom release from abdominal regions serves as a deterrent, with varying effectiveness against different antagonists. Additionally, the application of froths in a "paintbrush" manner represents a unique defensive adaptation, independent of similar behaviors observed in ants and grasshoppers.

Crematogaster engages in nuptial flights for reproduction. During these flights, queens mate with males, with the male's subsequent demise. Some colonies, however, exhibit variations, with large female workers capable of producing unfertilized eggs. This reproductive strategy contributes to the complexity of their social structure.