Strumigenys doryceps

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

Strumigenys doryceps casent0900198 p 1 high.jpg

Strumigenys doryceps casent0900198 d 1 high.jpg

Specimen Labels

The two known specimens of this species, both workers, were collected in rainforest.

Identification

Bolton (2000) - A member of the Strumigenys probatrix-group. The two known species of the group are differentiated as follows.

S. doryceps: Fully closed mandibles in full-face view with outer margins bulging outwards basally. Anterior clypeal margin narrowly rounded. Hairs on clypeal margins fine and simple, strongly curved. Preapical (fourth) funicular segment same width as apical. Metapleuron and side of propodeum smooth. Disc of postpetiole smooth. Propodeum with a pair of thin spines, subtended by narrow carinae down declivity.

Strumigenys probatrix: Fully closed mandibles in full-face view with outer margins not bulging outwards basally. Anterior clypeal margin terminating in a blunt point. Hairs on clypeal margins short and spatulate, very weakly curved. Preapical (fourth) funicular segment b roader than apical. Metapleuron and side of propodeum reticulate-punctate. Disc of postpetiole reticulate-punctate. Propodeum with a pair of triangular teeth, subtended by laminae down declivity.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Colombia, Ecuador (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.

  • doryceps. Pyramica doryceps Bolton, 2000: 211 (w.) ECUADOR. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 119

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 2.2, HL 0.59, HW 0.35, CI 59, ML 0.13, MI 22, SL 0.34, SI 97, PW 0.24, AL 0.66. With head in full-face view outer margins of mandibles bulge outwards basally beyond the line of the clypeal margin. Anterior clypeal margin narrowly rounded, the dorsum mostly smooth. Clypeus laterally and dorsally with simple short hairs that are curved or flexuous; similar but longer hairs present all over cephalic dorsum and dorsal alitrunk. Mesonotum with a single pair of long flagellate hairs; such hairs also present on waist segments and gaster. Combined lengths of funiculus segments 4 plus 5 slightly greater than SL but thickness of segment 4 no greater than that of 5 and only slightly broader than scape. Dorsal surfaces of head behind clypeus, alitrunk and petiole sculptured, but disc of postpetiole, pleurae and side of propodeum smooth and shining. Basigastral costulae quite sharply developed but very short. Petiole in profile with peduncle grading into node, the latter without a sharply differentiated anterior face. Propodeal spines elongate and thin , each subtended by a narrow carina on the declivity rather than an obvious lamella.

Paratype. TL 2.1, HL 0.58, HW 0.36, CI 62, ML 0.13, MI 22, SL 0.35, SI 97, PW 0.24, AL 0. 66.

Type Material

Holotype worker, Ecuador: Provo Pichincha, 4 krn. E Santo Domingo de los Colorados, 520 m., 22.vi.1975, rainforest, B-304 (S. & J. Peck) (Museum of Comparative Zoology). Paratype, 1 worker from same locality as holotype but 8.vii.1976 (S. & J. Peck) (The Natural History Museum).

References