Sericomyrmex radioheadi

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Sericomyrmex radioheadi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Sericomyrmex
Species: S. radioheadi
Binomial name
Sericomyrmex radioheadi
Ješovnik & Schultz, 2017

Sericomyrmex radioheadi F51c.jpg

Sericomyrmex radioheadi F51b.jpg

Known only from the type collection. No biological details of the species are known. General details about the biology of the genus are given here.

Identification

Ješovnik & Schultz (2017) - Medium-sized species; mandible dorsally smooth; frontal lobe triangular, narrow, directed anterad; antenna long, antennal scape reaching posterior cephalic corner; posterior cephalic emargination deep; lateral mesonotal tubercles sharp and long; first gastral tergite with lateral carinae distinct, dorsal carinae faint or absent.

The body color of S. radioheadi is evenly light yellow, lighter than in other Sericomyrmex species. Only dried, pinned specimens were available for this species, however, so the pale color may be due to age. Morphology indicates that S. radioheadi is the sister species to Sericomyrmex bondari, with which it shares a similar head shape, smooth mandibles, and sharp mesonotal tubercles. S. bondari can be separated from radioheadi by its larger body size, shorter scape, and shorter and blunter lateral mesonotal tubercles, and by the presence of at least some thick black hairs.

Keys including this Species

Distribution

Known from an Amazonian Venezuela type collection.

Distribution based on Regional Taxon Lists

Neotropical Region: Venezuela (type locality).


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Worker

Figure 52.

Jesovnik and Schultz 2017. Figure 52. S. radioheadi worker (USNMENT00924061), SEM images. a Head, full-face view b mandibles c eye d mesosoma and metasoma, lateral view e mesosoma(detail), lateral view f propodeum and metasoma, anterolateral view.

Castes

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • radioheadi. Sericomyrmex radioheadi Ješovnik & Schultz, 2017a: 86, figs. 51, 52 (w.) VENEZUELA.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

(holotype): HWe 1–1.08 (1.02) HW 1–1.08 (1.04) HW1 0.93–1 (1) HW2 1.08–1.15 (1.1) HW3 0.64–0.73 (0.72) IFW1 0.61–0.66 (0.62) IFW2 0.24–0.27 (0.24) HL1 1–1.08 (1) HL2 0.84–0.9 (0.88) SL 0.75–0.84 (0.8) EL 0.15–0.18 (0.15) Om 9–12 (9) WL 1.35–1.43 (1.36) PL 0.24–0.34 (0.29) PPL 0.2–0.25 (0.25) GL 0.92–1.02 (0.93) HFL 1.18–1.3 (1.25) PW 0.64–0.75 (0.65) CI 98–103 (102) FLI 59–62 (61) SI 75–82 (78) OI 15–18 (15) CEI 12–17 (12) [N=9]

Pilosity. Pubescence dense, appressed to decumbent, light yellow. Hairs curved, darker in color at base, yellow to gray, appressed to suberect, mostly decumbent.

Head. In full-face view evenly broad and long (CI=101 ± 2), posterior corner acute, posterior cephalic emargination deep (CEI=14 ± 2), gradually impressed. Vertexal impression distinct, frontal tumuli barely visible. Mandible with 7–8 teeth, dorsally smooth and glossy, finely transversely striate only along masticatory margin, striation sometimes faint. Eye medium-sized (OI =16 ± 1), mildly convex, without white layer, 9–12 ommatidia across largest diameter. Frontal lobe triangular, narrow (FLI=61 ± 1), posterior margin shorter than medial, lateral margin long, sometimes mildly convex. Frontal carina straight to slightly curved laterally, complete, reaching posterior cephalic corner. Antennal scape long (SI=77 ± 2), reaching posterior cephalic corners.

Mesosoma. Lateral pronotal tubercles short, lateral mesonotal tubercles sharp and long (Figure 51d, 52e); posterior mesonotal tubercles low and obtuse. Propodeal carinae faint, with distinct posterodorsal denticles.

Metasoma. Petiole with two low dorsal denticles; postpetiole with four low, short carina, two dorsal and two lateral, lateral pair faint. First gastral tergite with lateral carinae distinct, dorsal carinae absent or faint.

Type Material

Holotype worker: Venezuela, Amazonas, 10 km N of San Carlos de Río Negro, [2.0164, -67.0599] Jul-Aug 1978, K. Clark (Museum of Comparative Zoology: 1w, USNMENT00924059). Paratypes: same data as holotype (National Museum of Natural History: 2 w: USNMENT00924060; 2w, USNMENT00924063) (California Academy of Sciences: 2w, USNMENT00924061) (Museu de Zoologia da Universidade de Sao Paulo: 2w, USNMENT00924062).

Etymology

This species is named after the English rock band Radiohead as an acknowledgement of their longstanding efforts in environmental activism, especially in raising climate-change awareness, and in honor of their music, which is an excellent companion during long hours at the microscope while conducting taxonomic revisions of ants. The species name is a masculine noun in the genitive case.

References

  • Ješovnik, A., Schultz, T.R. 2017. Revision of the fungus-farming ant genus Sericomyrmex Mayr (Hymenoptera, Formicidae, Myrmicinae). ZooKeys, 670, 1–109 (DOI 10.3897/zookeys.670.11839).