| Odontomachus malignus|
Smith, F., 1859
A coastal species with an affinity for the intertidal zone.
Sorger & Zettel (2011) - This is a unique species, morphologically defined by group characters, and ecologically defined by living in intertidal zones.
Keys including this Species
Sorger & Zettel (2011) - Widely distributed in the Western Pacific area, with records from Borneo, Philippines, Sulawesi, Palau, New Guinea, New Britain, and Solomon Islands (Wilson 1959, Brown 1976, Olsen 2009). Brown (1976) presents the first records from the Philippines: Tawi-Tawi and Jolo Island in the country's extreme south. Here we present more northern records from the central Philippines, i.e., Bantayan and Bohol.
Distribution based on Regional Taxon Lists
Distribution based on specimens
Wilson (1959), Brown (1976), and Olsen (2009) describe the unusual habitat preference of O. malignus in intertidal zones. On Bantayan Island, the second author observed foraging workers in the intertidal zone of coral reef flats during low tide. On Bohol Island, one nest entrance was found in a mangrove close to the open sea. (Sorger & Zettel 2011)
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- malignus. Odontomachus malignus Smith, F. 1859a: 144 (w.) NEW GUINEA. Senior synonym of retrolatior: Brown, 1976a: 104; of tuberculatus: Emery, 1887b: 429; Wilson, 1959a: 495. See also: Brown, 1976a: 159; Sorger & Zettel, 2011: 155.
- tuberculatus. Odontomachus tuberculatus Roger, 1861a: 28 (w.) ASIA (no locality given). Subspecies of malignus: Mann, 1919: 305. Junior synonym of malignus: Emery, 1887b: 429; Emery, 1911d: 113; Wilson, 1959a: 495.
- retrolatior. Odontomachus retrolatior Viehmeyer, 1914a: 113 (w.) NEW GUINEA. Junior synonym of malignus: Brown, 1976a: 104.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Sorger & Zettel (2011) - Worker with smallest HW: CI 81, HL 2.25, HW 1.82, MdI 64, MdL 1.43, MsL 3.57, PnW 1.03, PtH 0.87, PtL 0.83, PtW 0.56, SI 128, SL 2.33, TL 10.00; worker with largest HW: CI 82, HL 2.82, HW 2.32, MdI 63, MdL 1.78, MsL 4.57, SI 123, SL 2.85, PnW 1.33, PtH 1.12, PtL 1.12, PtW 0.66, TL 11.13.
Structures: Mandibles long, reaching beyond midpoint of head, similar to O. infandus group. Head roughly rectangular, longer than wide, broadest at level of eyes. Conspicuous tubercles on both sides of median furrow dorso-posteriorly. Eyes located in first third of head. Dorsum of head striate, not reaching nuchal carina. Mesosoma elongate, broadest at level of pronotum. Pronotum rounded, metanotal groove in lateral view present. Very fine longitudinally oriented sculpture on pronotum; metanotum and propodeum with coarse transverse sculpture. Petiole short, truncated; short petiolar spine, anterior and posterior face flat; smooth and shiny, some fine striation may occur laterally. Gaster rounded to oval. Microsculpture on mesosoma and head finely granulate; ant appears matte.
Pilosity: Fine, loose semi-appressed white pubescence on head, mesosoma and petiole; gaster void of pubescence (some isolated hairs may occur), legs and antennae with dense white pubescence. Head with two standing setae, pronotum with some standing setae (2 - 3), setae on gaster increasing in number and length towards apex of abdomen.
Colour: Almost uniformly reddish brown, only head slightly lighter than rest.
Holotype worker in Oxford University Museum of Natural History. Labelled “Aru 55,” and bearing a Donisthorpe type-label. Two other workers, similarly mounted, are in Oxford University Museum of Natural History; one is from “M” (= Mysol I.), the other is from “Mat” (= Martabello I.).
- Brown, W. L., Jr. 1976c. Contributions toward a reclassification of the Formicidae. Part VI. Ponerinae, tribe Ponerini, subtribe Odontomachiti. Section A. Introduction, subtribal characters. Genus Odontomachus. Stud. Entomol. 19:67-171. (page 104, Senior synonym of retrolatior, also see page 159)
- Emery, C. 1887e. Catalogo delle formiche esistenti nelle collezioni del Museo Civico di Genova. Parte terza. Formiche della regione Indo-Malese e dell'Australia (continuazione e fine). [part]. Ann. Mus. Civ. Stor. Nat. 25[=(2)(5):427-432/ (page 429, Senior synonym of tuberculatus)
- Olsen, A. 2009. New record of the marine littoral ant, Odontomachus malignus Smith, F. 1859, in Palau. The Pan-Pacific Entomologist. 85(1):11-12. PDF
- Smith, F. 1859a. Catalogue of hymenopterous insects collected by Mr. A. R. Wallace at the islands of Aru and Key. [part]. J. Proc. Linn. Soc. Lond. Zool. 3:132-158. (page 144, worker described)
- Sorger, D.M. and H. Zettel. 2011. On the ants (Hymenoptera: Formicidae) of the Philippine Islands: V. The genus Odontomachus LATREILLE, 1804. Myrmecological News. 14:141-163. PDF
- Wilson, E. O. 1959c. Studies on the ant fauna of Melanesia V. The tribe Odontomachini. Bull. Mus. Comp. Zool. 120:483-510. (page 495, Senior synonym of tuberculatus)