Strumigenys perissognatha

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Strumigenys perissognatha
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. perissognatha
Binomial name
Strumigenys perissognatha
(Bolton, 2000)

Strumigenys perissognatha casent0900213 p 1 high.jpg

Strumigenys perissognatha casent0900213 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Strumigenys perissognatha.

Identification

Bolton (2000) - A member of the Strumigenys substricta-group. A spectacularly specialised and unmistakable species. Its only known close relative is Strumigenys substricta. Differences separating the two are tabulated under the latter name (see the description section).

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Brazil (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Strumigenys were once thought to be rare. The development and increased use of litter sampling methods has led to the discovery of a tremendous diversity of species. Many species are specialized predators (e.g. see Strumigenys membranifera and Strumigenys louisianae). Collembola (springtails) and other tiny soil arthropods are typically favored prey. Species with long linear mandibles employ trap-jaws to sieze their stalked prey (see Dacetine trap-jaws). Larvae feed directly on insect prey brought to them by workers. Trophallaxis is rarely practiced. Most species live in the soil, leaf litter, decaying wood or opportunistically move into inhabitable cavities on or under the soil. Colonies are small, typically less than 100 individuals but in some species many hundreds. Moist warm habitats and micro-habitats are preferred. A few better known tramp and otherwise widely ranging species tolerate drier conditions. Foraging is often in the leaf litter and humus. Workers of many species rarely venture above ground or into exposed, open areas. Individuals are typically small, slow moving and cryptic in coloration. When disturbed individuals freeze and remain motionless. Males are not known for a large majority of species.

Castes

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • perissognatha. Pyramica perissognatha Bolton, 2000: 238, figs. 160, 181 (w.) BRAZIL. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 126

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 3.1, HL 0.94, HW 0.84, CI 91, ML 0.12, MI 13, SL 0.34, SI 40, PW 0.31, AL 0.82. In full-face view the closed mandibles together diamond-shaped in outline; outer margins diverging from apex toward clypeus and passing through an abrupt inflected angle just prior to their point of intersection with the anterior clypeal margin. Conical teeth on mandible gradually increase in size from 1 (basal) to 5; teeth 5-7 are about the same size but tooth 8 is distinctly smaller and is followed by a cluster of 3 denticles apically. Extremely broad frontal carinae translucent, the scapes visible through them. Semitranslucent lamella present posteromedially between inner margins of occipital lobes, covering the occipital foramen. Minute hairs on clypeus directed toward midpoint of anterior margin. Head in profile very narrow dorsoventrally, its maximum depth 0.34 X HW (head about three times wider than deep) . Dorsal outline of head undulating in profile; convex at about the midlength, concave behind this and then sloping upwards again to the mid-occipital margin. Eye with 4 ommatidia in the longest row, even in profile almost completely overlapped and concealed by the frontal carinae. Ventrolateral margin of head with a narrow row of appressed spatulate hairs. Mesonotum with a pair of appressed spatulate hairs and a few similar present on lateral marginations of propodeum. Base of first gastral tergite with a transverse row of longer closely applied spatulate hairs that arise just behind the apices of the basigastral costulae and arch forward across the limbus to the posterior spongiform collar of the postpetiole. Legs with numerous decumbent to appressed spatulate hairs. Maximum depth of ventral spongiform curtain of petiole in profile greater that height of node. Lateral spongiform lobe of petiole extends along entire length of side of node and laps around its anterior margin, so that in dorsal view the node is completely surrounded by spongiform tissue. Disc of petiole in dorsal view longer than broad, of postpetiole broader than long, the latter also completely surrounded by spongiform tissue.

Paratypes. TL 2.9-3.1, HL 0.94-0.96, HW 0.82-0.84, CI 87-88, ML 0.11, MI 11-12, SL 0.34-0.36, SI 41-43, PW 0.30-0.32, AL 0.78-0.80 (3 measured).

Type Material

Holotype worker, Brazil: Amazonas, Manaus, Colosso, 2.iii.1994, #297 (R. Didham) (Instituto Nacional de Pesquisas da Amazonia). Paratypes, 3 workers with same data as holotype (INPA, The Natural History Museum).

References