Hypoponera tristis

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Hypoponera tristis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ponerinae
Tribe: Ponerini
Genus: Hypoponera
Species: H. tristis
Binomial name
Hypoponera tristis
Bolton & Fisher, 2011

Hypoponera tristis P casent0226554.jpg

Hypoponera tristis D casent0226554.jpg

Specimen Label

Only known from a few collections, nothing is known about the biology of Hypoponera tristis.

Identification

A member of the abeillei group. Very similar to Hypoponera segnis. See the nomenclature sections of segnis and Hypoponera dema for diagnostic characters.

Keys including this Species

Distribution

Known from Rwanda and Uganda.

Distribution based on Regional Taxon Lists

Afrotropical Region: Rwanda (type locality), Uganda.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Hypoponera inhabit and nest in leaf litter, the surface layer of soil, downed rotten wood, and soil around plant roots. Nests are typically found by turning objects on the ground, like downed wood and rocks, or through the ripping away of bark found on rotting downed wood or at the base of dead trees. Litter samples in tropical areas, especially in moist forested sites, often contain individuals of this genus. All Hypoponera are thought to be predators of small arthropods but published details about their diet are sparse. A lack of information about other aspects of their biology is also typical for most species.

The genus is most diverse in the tropics. Species found in higher latitudes tend to be more widespread, common and abundant than their tropical and subtropical congeners.

Castes

Nomenclature

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

  • tristis. Hypoponera tristis Bolton & Fisher, 2011: 110, figs. 124-126 (w.) RWANDA.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

(holotype in parentheses). Measurements: HL 0.67–0.79 (0.79), HW 0.54–0.60 (0.59), HS 0.615–0.695 (0.690), SL 0.46–0.56 (0.55), PrW 0.42–0.46 (0.46), WL 0.95–1.08 (1.03), HFL 0.48–0.58 (0.58), PeNL 0.21–0.24 (0.22), PeH 0.44–0.49 (0.48), PeNW 0.34–0.38 (0.36), PeS 0.340–0.367 (0.353) (10 measured). Indices: CI 75–80 (75), SI 88–93 (93), PeNI 77–85 (78), LPeI 46–50 (46), DPeI 152–170 (164).

Answers the description of Hypoponera segnis in all respects except for relative size of petiole. In segnis the petiole node is absolutely and relatively shorter in profile, PeNL 0.17–0.20 and LPeI 35–43, and is distinctly broader in dorsal view, with DPeI 180–211.

Paratype Specimen Labels

Type Material

Holotype worker (top specimen of three on pin), Rwanda: Kayove, 2100 m., 15.v.1973 (P. Werner) (Musee d'Histoire Naturelle Genève).

Paratypes. 8 workers with same data as holotype (MHNG, The Natural History Museum, California Academy of Sciences).

References