Crematogaster

Lund, 1831

Acrobat Ants, Cocktail Ants, Saint Valentine Ants

Crematogaster is a large, ecologically diverse of with over 520 described distributed worldwide. The genus is characterized by a distinctive -shaped that can be raised forward over the and when alarmed, a that has earned them the "cocktail ants" and "acrobat ants." Most species are , though some are ground-nesting. They exhibit complex social behaviors including cooperative hunting, trail-based recruitment, and defensive spraying.

Crematogaster lineolata by (c) Connor Cashman, some rights reserved (CC BY), uploaded by Connor Cashman. Used under a CC-BY license.

Crematogaster torosa by (c) Jake Nitta, some rights reserved (CC BY), uploaded by Jake Nitta. Used under a CC-BY license.

Crematogaster pinicola by (c) Raven Dandridge, some rights reserved (CC BY), uploaded by Raven Dandridge. Used under a CC-BY license.

Pronunciation

How to pronounce Crematogaster: //krɛmətoʊˈɡæstər//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

The -shaped is the primary diagnostic feature, with the ability to raise it forward and over the when disturbed. This gaster posture is unique among and serves both defensive and alarm-signaling functions. possess a metapleural gland that produces used in defense and subduing. The can be distinguished from other ants by this gaster combined with the presence of —pad-like projections on the that assist in climbing surfaces.

Images

Habitat

Most are , nesting in trees, under bark, or within cavities. Some species nest in pre-existing cavities in wood, under rocks, or in soil. Indoor nests have been documented around electrical wires and structural elements. Arboreal species frequently associate with myrmecophytic plants such as Macaranga, where they inhabit specialized and feed on food bodies and extrafloral nectar.

Distribution

Worldwide distribution with found on every continent except Antarctica. Particular diversity in tropical and subtropical regions.

Diet

Predominantly predatory, hunting including , , , and . Some also consume and extrafloral nectar, with certain species specializing on these -derived resources. South species have been observed feeding on sacs and spiderlings from colonies of the social spider Anelosimus eximius.

Life Cycle

occurs through where winged mate with males. Queens subsequently land, shed their , and establish colonies. Some exhibit alternative reproductive strategies involving large female that can produce unfertilized developing into males in queenless colonies. production in some species is tied to seasonal rainfall patterns, occurring at the beginning of the rainy season, with male production preceding it.

Behavior

Foragers recruit nestmates to assist in capture through and trail-laying. When hunting, may "spread-eagle" large prey by outstretching its limbs and carrying it along their backsides using . Trail-laying involves lifting the sharply upward and bending it forward, depositing scents from the tibial gland without the touching the substrate. Defensive includes raising the gaster forward, spraying from the metapleural gland in a "paintbrush" manner to surround opponents, and releasing alarm pheromones. Venom composition includes phenols and carboxylic acids with properties. Some establish permanent foraging trails with stable chemical markings.

Ecological Role

Significant of other including such as and . Participate in myrmecophytism—mutualistic relationships with plants where provide protection from in exchange for shelter and food resources. Serve as for various vertebrates and including birds, , and other ants. Some function as ecological in ant .

Human Relevance

Occasional nuisance pest when nesting indoors around electrical wiring or structural elements. Some may protect -producing pests such as , indirectly affecting agriculture. Documented as of including pollinating .

Similar Taxa

Other FormicidaeCrematogaster is distinguished by the unique -shaped with flexible allowing forward raising—no other exhibits this combination of gaster shape and mobility.