Strumigenys juliae
| Strumigenys juliae | |
|---|---|
| |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Hymenoptera |
| Family: | Formicidae |
| Subfamily: | Myrmicinae |
| Tribe: | Attini |
| Genus: | Strumigenys |
| Species: | S. juliae |
| Binomial name | |
| Strumigenys juliae Forel, 1905
| |
Known from a few litter samples in wet forest and rainforest.
Contents
Identification
Bolton (2000) – A member of the godeffroyi complex in the Strumigenys godeffroyi-group. See notes under Strumigenys godeffroyi.
Keys including this Species
Distribution
Distribution based on Regional Taxon Lists
Indo-Australian Region: Borneo, Indonesia (type locality), Malaysia, Philippines, Singapore.
Distribution based on AntMaps
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
Worker
- Images provided by Harvard University, Museum of Comparative Zoology
Nomenclature
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- juliae. Strumigenys juliae Forel, 1905c: 12 (w.) INDONESIA (Java). See also: Bolton, 2000: 793.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Description
Worker
Bolton (2000) - TL 2.0-2.2, HL 0.55-0.59, HW 0.38-0.42, CI 67-73, ML 0.24-0.27, MI 43-48, SL 0.32-0.34, SI 79-87, PW 0.24-0.27, AL 0.58-0.62 (16 measured).
Characters of godeffroyi-complex. Cephalic dorsum with pair of erect hairs closest to midline on occipital margin short stiff and erect, straight to shallowly evenly curved but the apical half not abruptly curved anteriorly nor looped. With head in full-face view the dorsolateral margin posterior to the flagellate apicoscrobal hair has a row of 3-4 stiffly projecting hairs. These hairs contrast with the marginal hairs anterior to the flagellate hair as they are more cylindrical (i.e. not spatulate), more elevated and less strongly curved anteriorly. Ground-pilosity on pronotal dorsum sparse and dilute, not appearing as a pelt. Dorsum and side of pronotum smooth and shining (when clean), frequently completely without punctate sculpture. Dorsum of pronotum with a pair of erect flagellate hairs in addition to the humeral pair. Pleurae and side of propodeum mostly to entirely smooth, any reticulate-punctate sculpture present is confined to periphery. Propodeal declivity with a broad and very conspicuous lamella. Propodeal teeth at most only weakly expressed (may be vestigial), entirely confluent with the lamella and surmounted by a narrow convex crest of spongiform tissue. Disc of postpetiole unsculptured. Basigastral costulae conspicuous but not extending half the length of the tergite.
Type Material
Bolton (2000) - Syntype workers, INDONESIA: Java, Depok and Bogor ( = Buitenzorg), iii.1904 (K. Kraepelin) (Musee d'Histoire Naturelle Genève) [examined].
References
- Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 793, redescription of worker)
- Emery, C. 1924f [1922]. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [concl.]. Genera Insectorum 174C: 207-397 (page 321, catalogue)
- Forel, A. 1905f. Ameisen aus Java. Gesammelt von Prof. Karl Kraepelin 1904. Mitt. Naturhist. Mus. Hambg. 22: 1-26 (page 12, worker described)
