Strumigenys kapryx

Strumigenys kapryx
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Myrmicinae
Tribe:	Attini
Genus:	Strumigenys
Species:	S. kapryx
Binomial name
	Strumigenys kapryx; Bolton, 2000 Specimen Labels

Known from wet forest and rainforest litter-samples.

Identification

Bolton (2000) - A member of the ebbae complex in the Strumigenys koningsbergeri-group. The non-paratypic material shows some variation. The mandible lamella is always present but is variable in width; preocular impression in ventrolateral margin of head varies from almost absent to quite distinct; sculpture of the metapleuron and side of propodeum may be superficial or faint, in some these areas may appear mostly smooth; erect hairs on the first gastral tergite are decidedly more expanded at their apices in some samples than in others. There is insufficient material available to decide if these variations have significance at species rank, so for the present all are retained under kapryx.

Of the species in the complex that possess a strongly developed lamella on the mandible only kapryx has it straight-edged throughout its length. The species lacks sinuate outer margins to the mandibles and has its preapical mandibular tooth relatively small.

Keys including this Species

Key to Strumigenys of East Asia

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 4.95° to 4°.


North Temperate	North Subtropical	Tropical	South Subtropical	South Temperate

Source: AntMaps

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo (type locality), Indonesia, Malaysia.

Distribution based on AntMaps

Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.

Biology

Explore Overview of Strumigenys 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.

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Castes

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

kapryx. Strumigenys kapryx Bolton, 2000: 846, fig. 453 (w.) BORNEO.

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 2.3, HL 0.69, HW 0.54, CI 78, ML 0.26, MI 38, SL 0.34, SI 63, PW 0.30, AL 0.66. With characters of ebbae-complex. Preapical tooth short-conical and weakly recurved, close to the apicodorsal tooth, its length about half or somewhat less of width of mandible at point where it arises. Inner margin of mandible with a prominent straight-edged lamella. Lamella narrow near base of mandible, increasing in width distally and terminating just proximal of the preapical tooth; broadest point of lamella just proximal of its apex. Outer margin of mandible straight to very shallowly convex from base to level of preapical tooth. Upper scrobe margins evenly divergent and almost straight from frontal lobes posteriorly; only extreme tip of eye visible in full-face view or eye not visible. Dorsum of head in profile with short erect hairs along occipital margin, 1-2 on dorsum of occipital lobe and a single pair at highest point of vertex; without erect hairs anterior to this. Pronotum with a single pair of short standing hairs, close to anterodorsal margin. Mesonotum with a single pair of short erect hairs. Katepisternum partially to mostly smooth, metapleuron and side of propodeum reticulate to finely reticulate-punctate. Bullae of femoral glands small and inconspicuous on middle and hind legs. Lamella on propodeal declivity well developed, its posterior (free) margin shallowly convex at least in its lower half. Dorsum of petiole node reticulate-punctate, much more densely sculptured than smooth disc of postpetiole. Standing hairs on first gastral tergite simple or very slightly flattened and expanded apically.

Paratypes. TL 2.3-2.4, HL 0.66-0.72, HW 0.51-0.55, CI 76-78, ML 0.25-0.29, MI 38-40, SL 0.32-0.36, SI 62-65, PW 0.28-0.31, AL 0.60-0.70 (5 measured).

Dimensions of non-paratypic workers. HL 0.68-0.72, HW 0.53-0.57, CI 75-82, ML 0.27-0.30, MI 39-43, SL 0.34-0.37, SI 62-68 (7 measured).

Type Material

Holotype worker, Malaysia: Sarawak, 4th Division, Gn. Mulu N. P., camp 5, v.-viii.1978, B. M. 1978-49 (P. M. Hammorui & J. E. Marshall) (The Natural History Museum). Paratypes. 5 workers with same data as holotype (BMNH, Museum of Comparative Zoology).

References

Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 846, fig. 453 worker described)

References based on Global Ant Biodiversity Informatics

Mezger D., and M. Pfeiffer. 2011. Partitioning the impact of abiotic factors and spatial patterns on species richness and community structure of ground ant assemblages in four Bornean rainforests. Ecography 34: 39-48.
Mezger D., and M. Pfeiffer. 2011. Partitioning the impact of abiotic factors and spatial patterns on species richness and community structure of ground assemblages in four Bornean rainforest. Ecography 34: 39-48.
Pfeiffer M., and D. Mezger. 2012. Biodiversity Assessment in Incomplete Inventories: Leaf Litter Ant Communities in Several Types of Bornean Rain Forest. PLoS ONE 7(7): e40729. doi:10.1371/journal.pone.0040819
Pfeiffer M.; Mezger, D.; Hosoishi, S.; Bakhtiar, E. Y.; Kohout, R. J. 2011. The Formicidae of Borneo (Insecta: Hymenoptera): a preliminary species list. Asian Myrmecology 4:9-58