Royidris etiolata

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Royidris etiolata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Royidris
Species group: notorthotenes
Species: R. etiolata
Binomial name
Royidris etiolata
Bolton & Fisher, 2014

Royidris etiolata casent0002370 p 1 high.jpg

Royidris etiolata casent0002370 d 1 high.jpg

Specimen Labels

R. etiolata nests under stones in spiny forest.

Identification

A member of the notorthotenes species group. Bolton and Fisher (2014) - Workers of etiolata mostly conform to the description of Royidris notorthotenes. The two are closely related but separated by the comparative dimensions noted below, most striking of which is the extremely elongate scape. In addition, etiolata is a more gracile species. Its head in full-face view has the sides behind the eyes strongly convergent posteriorly, so that the transverse portion of the posterior margin always appears shorter and narrower than in notorthotenes. For comparison of measurements see Table 3, Bolton and Fisher 2014.

Keys including this Species

Distribution

Endemic to Madagascar.

Distribution based on Regional Taxon Lists

Malagasy Region: Madagascar (type locality).


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Known only from the worker caste.

Nomenclature

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

  • etiolata. Royidris etiolata Bolton & Fisher, 2014: 52, figs. 51-53, Map 139 (w.) MADAGASCAR.

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

Description

Worker

(holotype in parentheses). TL 3.5–4.2 (3.9), HL 0.88–1.00 (0.98), HW 0.66–0.77 (0.75), CI 75–78 (77), SL 1.04–1.20 (1.14), SI 148–158 (152), PW 0.42–0.50 (0.48), WL 1.14–1.36 (1.30) (11 measured). EL 0.21–0.24 (EL/HW 0.31–0.32). MfL 0.98–1.14 (MfL/HW 1.46–1.50, MfL/MfH 4.00–4.38).

Workers of etiolata mostly conform to the description of Royidris notorthotenes. The two are closely related but separated by the comparative dimensions noted below, most striking of which is the extremely elongate scape. In addition, etiolata is a more gracile species. Its head in full-face view has the sides behind the eyes strongly convergent posteriorly, so that the transverse portion of the posterior margin always appears shorter and narrower than in notorthotenes. For comparison of measurements see Table 3, Bolton and Fisher 2014.

Type Material

Holotype worker, Madagascar: Prov. Toliara, Mahafaly Plateau, 6.2 km. 74° ENE Itampolo, 24°39.2’S, 43°59.8’E, 80 m., 21–25.ii.2002, BLF 5796, CASENT0002370, under stone, spiny forest/thicket (Fisher et al.) (California Academy of Sciences). Paratypes. 9 workers with same data as holotype but 3 workers CASENT0002371, 1 worker CASENT0002372, 1 worker CASENT0002437, 3 workers CASENT0002438, 1 worker CASENT0009799 (CASC, The Natural History Museum).

References

  • Bolton, B. & Fisher, B.L. 2014. The Madagascan endemic myrmicine ants related to Eutetramorium (Hymenoptera: Formicidae): taxonomy of the genera Eutetramorium Emery, Malagidris nom. n., Myrmisaraka gen. n., Royidris gen. n., and Vitsika gen. n. Zootaxa 3791:1–99. doi:10.11646/zootaxa.3791.1.1

References based on Global Ant Biodiversity Informatics

  • Bolton B., and B. L. Fisher. 2014. The Madagascan endemic myrmicine ants related to Eutetramorium (Hymenoptera: Formicidae): taxonomy of the genera Eutetramorium Emery, Malagidris nom. n., Myrmisaraka gen. n., Royidris gen. n., and Vitsika gen. n. Zootaxa 3791(1): 1-99.