Strumigenys mazu

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Strumigenys mazu
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. mazu
Binomial name
Strumigenys mazu
(Terayama, Lin & Wu, W.-J., 1996)

Pyramica mazu side (www.niaes.affrc.go.jp).jpg

Pyramica mazu top (www.niaes.affrc.go.jp).jpg

Specimen labels

Very little is known about this species. In Hong Kong it is an uncommon species and is known only from a few locations. It occurs in secondary forests at elevations ranging from 262 to 291 m (Tang et al., 2019). It apparently forms small monogynous colonies of about 20 individuals (Masuko 2009b).

Identification

Bolton (2000) - A member of the Strumigenys mnemosyne-group. Known from very little material, mazu is nevertheless the most confidently identified species of this group. Its reticulate-punctate cephalic dorsum that contrasts strongly with the smooth pronotum, sharply defined upper scrobe margin and lack of basigastral costulae quickly separates it from the four remaining species of the group. In these (Strumigenys daspleta, Strumigenys mnemosyne, Strumigenys runa, Strumigenys taphra) the cephalic dorsum is as smooth as the pronotum, the upper scrobe margin is rounded and poorly defined, and basigastral costulae are present on the first gastral tergite on each side of a mid-dorsal clear area.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Oriental Region: Taiwan (type locality).
Palaearctic Region: China, Japan.


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 New General Catalogue, a catalogue of the world's ants.

  • mazu. Smithistruma mazu Terayama, Lin & Wu, 1996: 337, figs. 26, 27, 30, 31 (w.) TAIWAN. Combination in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 123. See also: Bolton, 2000: 446.

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 1.3-1.5, HL 0.41-0.43, HW 0.30-0.31, CI 70-76, ML 0.07-0.08, MI 17-18, SL 0.16-0.18, SI 52, PW 0.20, AL 0.40-0.43 (2 measured). Dorsolateral margin of head with numerous freely laterally projecting fine sub flagellate hairs. Clypeus mostly smooth, with extremely faint vestiges of superficial sculpture; anterior clypeal margin transverse. Cephalic dorsum reticulate-punctate behind clypeus and with numerous fine simple standing hairs; the sculpture of the dorsum contrasts strongly with the smooth cuticle within the well defined scrobe. Leading edge of scape shallowly convex, with minute elevated fine hairs that curve toward the apex of the scape and also with a series of 3-4 straight, freely projecting elongate simple hairs that are directed an terodorsally. Dorsal surfaces of alitrunk, petiole, postpetiole and first gastral tergite smooth and shining. Sides of alitrunk entirely smooth and shining. Dorsum of promesonotum, waist segments and first gastral tergite with numerous fine standing hairs. Dorsal (outer) surfaces of middle and hind tibiae with quite long decumbent hairs that curve toward the apex and also with a number of freely projecting more or less straight hairs present; the latter also occur on the basitarsi. Lamella on propodeal declivity short, translucent, almost as broad as high and reaching up to the level of the dorsal margin of the spiracle. Ventral spongiform strip of petiole deeper in profile than depth of peduncle. Petiole node in dorsal view conspicuously broader than long, with prominent lateral spongiform lobes and an extremely narrow posterior collar. Disc of postpetiole broader than long, the sides entirely margined with spongiform tissue. Anterior margin of disc in dorsal view approximately transverse, the sides convex and converging posteriorly. Basigastral costulae absent.

Type Material

Bolton (2000) - Holotype worker, TAIWAN: Chilan, Yilan Hsien, 28.vii.1988 (no collector' s name given). Paratype workers, JAPAN: Okinawa Pref., Okinawa Is, Henza-jima I., ix.1959 (H. Takamine) (National Institute of Agro-Environmental Sciences, Museum of Nature and Human Activities) [MNHA paratypes examined].

References