Hypoponera segnis

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

Hypoponera segnis P casent0226545.jpg

Hypoponera segnis D casent0226545.jpg

Specimen Label

Known only from a few collections, nothing is known about the biology of Hypoponera segnis.

Identification

Bolton and Fisher (2011) - Hypoponera segnis is very close to Hypoponera tristis, which is also from Rwanda and has the same type-locality. At present the two are separated only by the shape of the petiole, which is shorter in profile and distinctly broader in dorsal view in the former (compare indices). The differences in shape are consistent in the sparse material available.

A member of the abeillei group.

Keys including this Species

Distribution

Known from Democratic Republic of Congo, Kenya and Rwanda.

Distribution based on Regional Taxon Lists

Afrotropical Region: Democratic Republic of Congo, Kenya, Rwanda (type locality).

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

Queens and males have not been collected.

Nomenclature

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

  • segnis. Hypoponera segnis Bolton & Fisher, 2011: 99, figs. 109-111 (w.) RWANDA.

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

Hypoponera segnis is very close to Hypoponera tristis, which is also from Rwanda and has the same type-locality. At present the two are separated only by the shape of the petiole, which is shorter in profile and distinctly broader in dorsal view in the former (compare indices). The differences in shape are consistent in the sparse material available. The relationship of these two nominal species should be reassessed when more material is available. See also Hypoponera dema.

Description

Worker

(holotype in parentheses). Measurements: HL 0.65–0.77 (0.70), HW 0.50–0.60 (0.55), HS 0.605–0.680 (0.625), SL 0.46–0.58 (0.50), PrW 0.38–0.48 (0.44), WL 0.88–1.08 (0.95), HFL 0.47–0.60 (0.52), PeNL 0.17–0.20 (0.18), PeH 0.45–0.57 (0.47), PeNW 0.32–0.40 (0.35), PeS 0.320–0.380 (0.333) (20 measured). Indices: CI 76–81 (79), SI 86–98 (91), PeNI 77–86 (80), LPeI 32–43 (38), DPeI 180–220 (194).

Eyes absent or at most a single, poorly defined and very small ommatidium. Apex of scape, when laid straight back from its insertion, just fails to touch the midpoint of the posterior margin in full-face view; SL/HL 0.68–0.77. Pronotal dorsum almost smooth, obviously much less strongly and densely sculptured than the densely reticulate-punctate cephalic dorsum. Metanotal groove absent from dorsum of mesosoma or at most with a vestigial faint remnant. Propodeum marginate between declivity and side. Petiole in profile tall and slender, the node short from front to back and with a shallowly rounded dorsum. Posterior surface of petiole node without cuticular ridges that radiate upward from the peduncle. Subpetiolar process with an obtuse ventral angle. In dorsal view petiole node short and broad, with posterior face transverse and anterior face convex; node not thickly D-shaped. Maximum width of first gastral tergite in dorsal view slightly greater than width of second gastral tergite at its midlength. Cross-ribs at base of cinctus of second gastral tergite short but distinct. Midline length of second gastral posttergite, from posterior margin of cinctus to apex, slightly less than the width of the segment at its midlength. Disc of second gastral tergite with sharply incised small punctures that are separated by areas of glossy cuticle; the diameters of the punctures are equal to, or slightly less than, the distances that separate the punctures. First gastral tergite dorsally pubescent, without conspicuous standing setae that are clearly more erect and strongly project above the level of the pubescence; the few setae that are present are only fractionally longer than the pubescence and are indistinct.

Paratype Specimen Labels

Type Material

Holotype worker (top specimen of three on pin), Rwanda: Kayove, 2100 m., 23.iv.1973 (P. Werner) (Musee d'Histoire Naturelle Genève). Paratypes. 11 workers with same data as holotype; 12 workers with same data but 15.v.1973; 15 workers with same data but 12.viii.1973 (MHNG, The Natural History Museum, California Academy of Sciences).

References

  • Bolton, B. & Fisher, B.L. 2011. Taxonomy of Afrotropical and West Palaearctic ants of the ponerine genus Hypoponera Santschi. Zootaxa 2843: 1-118. PDF