|Monomorium decamerum, now Anillomyrma decamera|
|Based on Ward et al., 2014|
Eguchi et al. (2009) - K. Eguchi and V.T. Bui collected workers of Anillomyrma decamera in a well-developed dry forest in the southern coastal part of Vietnam, by underground bait-trapping; baits (pork sausage) were buried in sandy soil. On the other hand, J. Caceres, a colleague of D.M. General, collected A. decamera in abandoned agricultural land that had isolated stands of abaca plants (Musaceae: Musa textilis NÉE) and jackfruit trees (Moraceae: Artocarpus heterophyllus LAM.), and was overgrown with tall grasses, upright and creeping bamboos and tree ferns. Ant samples were obtained by sifting a soil core sample taken from a deep sandy loam of volcanic origin. Bolton (1987) collected A. tridens on sandy ground in a lowland rain forest. These facts suggest that the distribution of this species may be affected by soil type. Emery (1901) mentioned that the type material of A. decamera was collected from termite nest(s). Anillomyrma may actively hunt soil invertebrates, including termites, using its well-developed sting to envenomate prey, and it may also scavenge animal matter under the ground. Bolton (1987) tentatively suggested that A. tridens is nomadic. These scattered observations may help us to develop collecting and observing methods for these mysterious ant species.
The eyes are absent. The body is small and thin (less than 2.8 mm long) and uniform pale yellow in color. Similar to Solenopsis but differs in having a three-segmented rather than two-segmented antennal club and in the complete lack of eyes. Solenopsis have small eyes. Also similar to Leptanilla because of their elongate body and lack of eyes. Differ by the presence of frontal lobes that partially cover the antennal sockets. Similar to Dolopomyrmex (United States) but Anillomyrma lacks the median clypeal seta. (Shattuck 1999 and Eguchi et al. 2009)
Workers of the genus are recognised by the following features: 10-segmented antennae; postpetiole attached to top of anterior face of first gastral segment (Bolton, 1994; Eguchi et al., 2010; Hosoishi et al., 2015).
Keys including this Genus
Distribution and Richness based on AntMaps
Known only from the worker caste.
• Antennal segment count 10 • Antennal club 3 • Palp formula 2,1 • Total dental count 3-4 • Spur formula 0, 0 • Eyes absent • Scrobes absent • Sting present
• Caste unknown
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- ANILLOMYRMA [Myrmicinae: Solenopsidini]
- Anillomyrma Emery, 1913b: 261 [as subgenus of Monomorium]. Type-species: Monomorium decamerum, by monotypy.
- Anillomyrma raised to genus: Ettershank, 1966: 97.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Eguchi et al. (2009) - By the combination of the characteristics marked by asterisks, Anillomyrma is distinguished from the other genera of the Solenopsis genus group (sensu Bolton 2003). Worker monomorphic. Body extensively depigmented, weakly sclerotized (easily shrunk when dry-mounted). Head longer than broad, without preoccipital carina; frontal lobe in full-face view only partially concealing torulus, not extending posteriorly as frontal carina; antennal scrobe absent; median portion of clypeus only weakly expanding anteriad and distinctly raised above the level of lateral portions, *not bicarinate laterally below antennal insertion, *narrowly inserted between frontal lobes; median clypeal seta well developed; 1st paracarinal seta well developed; lateral portions of clypeus not forming a raised rim or shield wall in front of antennal insertions; anterior tentorial pit located at the midpoint of antennal insertion and lateral margin of head in full-face view; mandible elongate-triangular, with 3 or 4 distinctly dark-colored teeth on masticatory margin but without any tooth / denticles on basal margin; a short diastema present between the preapical and 3rd teeth; trulleum small and closed; hypostoma without lateral tooth just mesal to each mandibular base; anterior margin of labrum broadly concave medially; *both maxillary and labial palps consisting of two completely separated segments (not consisting of two semi-fused segments, as previously reported ); praementum with a pair of long and simple setae; *antenna 10-segmented, *with |
3-segmented club; antennal segments III - VII each much shorter than broad; segment X much longer than segments VIII and IX combined; segments VIII, IX and X with several sensilla tricodea curvata (arrow in Fig. 7) which are long, thick, simple and appressed; segment X with several sensilla ampullacea (arrow in Fig. 8) [i.e., a peg contained in a bottle-shaped chamber (ampulla) which connects apically with a thin duct; the tube opening on the outer surface of the apex of segment X]; *eye completely absent. Mesosoma in dorsal view moderately constricted between promesonotum and propodeum; promesonotum in lateral view low, almost flat or very weakly convex, without conspicuous humerus; promesonotal suture completely absent dorsally; metanotal groove present dorsally as a weak transverse striation; propodeum neither armed posterodorsally nor carinate posterolaterally; propodeal lobe absent; both mesosternum and metasternum without conspicuous ventral tooth; *propodeal spiracle small, situated at or slightly behind midlength of sides of propodeum; metapleural gland relatively large. *Forecoxa robust, *and much longer than middle and hind coxa; meso- and metatibial spur absent. *Petiolar peduncle long, *without any anteroventral process; *petiolar node long, low and dorsally broadly convex in lateral view; postpetiole much shorter than petiole, in dorsal view almost as broad as or slightly broader than petiolar node, *in lateral view broadly attached to top of anterior face of first gastral segment. Gaster elongate; gastral shoulder absent; *sting strongly developed.
- Bolton, B. 1987. A review of the Solenopsis genus-group and revision of Afrotropical Monomorium Mayr (Hymenoptera: Formicidae). Bull. Br. Mus. (Nat. Hist.) Entomol. 54: 263-452 (page 271, 273, Annilomyrma as genus)
- Bolton, B. 1994. Identification guide to the ant genera of the world. Cambridge, Mass.: Harvard University Press, 222 pp. (page 106, Anillomyrma in Myrmicinae, Solenopsidini)
- Bolton, B. 2003. Synopsis and Classification of Formicidae. Mem. Am. Entomol. Inst. 71: 370pp (page 208, Anillomyrma as genus in Myrmicinae, in Solenopsis genus group; )
- Dlussky, G. M.; Fedoseeva, E. B. 1988. Origin and early stages of evolution in ants. Pp. 70-144 in: Ponomarenko, A. G. (ed.) Cretaceous biocenotic crisis and insect evolution. Moskva: Nauka, 232 pp. (page 80, Anillomyrma in Myrmicinae, Monomoriini)
- Eguchi, K., T. V. Bui, D. M. General and G. D. Alpert. 2009. Revision of the ant genus Anillomyrma Emery, 1913 (Hymenoptera: Formicidae: Myrmicinae: Solenopsidini). Myrmecological News 13: 31-36. PDF
- Emery, C. 1913c. Études sur les Myrmicinae. [V-VII.]. Ann. Soc. Entomol. Belg. 57: 250-262 (page 261, Anillomyrma as subgenus of Monomorium)
- Emery, C. 1915g. Noms de sous-genres et de genres proposés pour la sous-famille des Myrmicinae. Modifications à la classification de ce groupe (Hymenoptera Formicidae). Bull. Soc. Entomol. Fr. 1915: 189-192 (page 190, Anillomyrma as subgenus of Monomorium)
- Emery, C. 1922c. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [part]. Genera Insectorum 174B: 95-206 (page 184, Anillomyrma in Myrmicinae, Solenopsidini, Anillomyrma as subgenus of Monomorium)
- Ettershank, G. 1966. A generic revision of the world Myrmicinae related to Solenopsis and Pheidologeton (Hymenoptera: Formicidae). Aust. J. Zool. 14: 73-171 (page 97, Annilomyrma raised to genus; page 81, Anillomyrma in Myrmicinae, Monomorium genus group)
- Forel, A. 1917. Cadre synoptique actuel de la faune universelle des fourmis. Bull. Soc. Vaudoise Sci. Nat. 51: 229-253 (page 242, Anillomyrma in Myrmicinae, Solenopsidini [subtribe Monomoriini], Anillomyrma as subgenus of Monomorium)
- Hölldobler, B.; Wilson, E. O. 1990. The ants. Cambridge, Mass.: Harvard University Press, xii + 732 pp. (page 16, Anillomyrma in Myrmicinae, Solenopsidini)
- Wheeler, W. M. 1922i. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. VII. Keys to the genera and subgenera of ants. Bull. Am. Mus. Nat. Hist. 45: 631-710 (page 675, 686, Anillomyrma as subgenus of Monomorium)