Strumigenys kraepelini

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Strumigenys kraepelini
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. kraepelini
Binomial name
Strumigenys kraepelini
Forel, 1905

Strumigenys kraepelini casent0280749 p 1 high.jpg

Strumigenys kraepelini casent0280749 d 1 high.jpg

Specimen Labels

Known from wet forest and rainforest litter-samples.

Identification

Bolton (2000) - A member of the feae complex in the Strumigenys mayri-group. As currently understood this species shows considerable variation in size and relative dimensions of head and scape. This, coupled with variation in sculpture of the dorsal alitrunk, leads me to believe that more than one real species may be included here. The question cannot be resolved at present because material representing the varying forms is too sparse. It is certain that the original type-material of kraepelini has long ceased to exist. While I am convinced that Forel’s taxon resides in kraepelini as defined here, designation of a neotype should await the more detailed analysis of variation that is necessary. See notes under Strumigenys barylonga and Strumigenys exilirhina.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

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


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 Online Catalogue of the Ants of the World.

  • kraepelini. Strumigenys kraepelini Forel, 1905c: 8 (w.) INDONESIA (Java). See also: Bolton, 2000: 885.

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 2.7-3.0, HL 0.70-0.88, HW 0.38-0.50, CI 52-60, ML 0.32-0.40, MI 42-48, SL 0.45-0.60, SI 110-129, PW 0.27-0.28, AL 0.70-0.85 (18 measured).

Characters of the feae-complex. Preapical tooth short-triangular, its length half or less of the width of mandible at point where tooth arises, always shorter than maximum width of mandible. Outer margin of mandible in full-face view shallowly convex from close to base to level of preapical tooth. With head in full-face view anteriormost point of eye is located just posterior to 0.50 X HL (behind midlength of head). Upper scrobe margin with two freely laterally projecting long flagellate hairs, the posterior one in apicoscrobal position. Cephalic dorsum with 4-6 erect flagellate hairs along the occipital margin, a similar but usually shorter pair present at highest point of vertex. Preocular notch absent, ventrolateral margin of head extremely shallowly evenly concave immediately in front of eye and straight anteriorly. Maximum diameter of eye usually slightly greater than maximum width of scape, rarely less. Pronotal humeral hair flagellate. Pronotal dorsum varying from weakly reticulate-punctate to almost entirely smooth. Pronotal dorsum without standing hairs, mesonotum with 2 pairs of erect flagellate hairs. Dorsal surfaces of waist segments and first gastral tergite with long flagellate hairs. Pleurae and side of propodeum smooth; in profile the mesothorax long and constricted in its anterior half. One or two long fine erect flagellate hairs present on the dorsal (outer) surface of the hind basitarsus and another 1-2 on the hind tibia; similar pilosity present on the other legs. Petiole in profile long and low, node with a strongly differentiated anterior face. Dorsum of node long and low, shallowly convex, much longer than anterior face. In dorsal view petiole node at least as long as broad, usually longer than broad, reticulate-punctate; disc of postpetiole smooth. Basigastral costulae shorter than disc of postpetiole.

Type Material

Bolton (2000) - Holotype worker, INDONESIA: Java, Bogor ( = Buitenzorg), iii.1904 (K. Kraepelin) (holotype lost (probably destroyed in World War II), not in Zoologisches Institut und Zoologisches Museum der Universität Hamburg or Musee d'Histoire Naturelle Genève).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 885, 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 8, worker described)

References based on Global Ant Biodiversity Informatics

  • Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
  • Chapman, J. W., and Capco, S. R. 1951. Check list of the ants (Hymenoptera: Formicidae) of Asia. Monogr. Inst. Sci. Technol. Manila 1: 1-327
  • Forel A. 1905. Ameisen aus Java. Gesammelt von Prof. Karl Kraepelin 1904. Mitt. Naturhist. Mus. Hambg. 22: 1-26.
  • 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.0040762
  • 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.0040911
  • 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
  • Woodcock P., D. P. Edwards, R. J. Newton, C. Vun Khen, S. H. Bottrell, and K. C. Hamer. 2013. Impacts of Intensive Logging on the Trophic Organisation of Ant Communities in a Biodiversity Hotspot. PLoS ONE 8(4): e60756. doi:10.1371/journal.pone.0060756
  • Woodcock P., D. P. Edwards, T. M. Fayle, R. J. Newton, C. Vun Khen, S. H. Bottrell, and K. C. Hamer. 2011. The conservation value of South East Asia's highly degraded forests: evidence from leaf-litter ants. Phil. Trans. R. Soc. B. 366: 3256-3264.
  • Woodcock P., D.P. Edwards, T.M. Fayle, R.J. Newton, C. Vun Khen, S.H. Bottrell, and K.C. Hamer. 2011. The conservation value of South East Asia's highly degraded forests: evidence from leaf-litter ants. Phil. Trans. R. Soc. B 366: 3256-3264.