Vitsika acclivitas

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Vitsika acclivitas
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Vitsika
Species: V. acclivitas
Binomial name
Vitsika acclivitas
Bolton & Fisher, 2014

Vitsika acclivitas casent0042782 p 1 high.jpg

Vitsika acclivitas casent0042782 d 1 high.jpg

Specimen Labels

Almost all the specimens were from leaf litter samples in tropical dry forest. Only the two queens that constitute the NE Andapa sample were from rainforest.

Identification

Bolton and Fisher (2014) - Among the small, yellow species of Vitsika, acclivitas is distinguished by its much less erect petiole node. The node shape that seems most similar is that of Vitsika venustas, but in that species the anterior face of the petiole node is not as shallowly inclined, and the postpetiole in profile has a node that is visibly longer than the height of the segment.

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

Males have yet to be collected.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • acclivitas. Vitsika acclivitas Bolton & Fisher, 2014: 73, figs. 81-83, Map 149 (w.q.) 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 2.5–3.0 (2.7), HL 0.56–0.66 (0.61), HW 0.48–0.55 (0.53), CI 83–87 (87), SL 0.38–0.46 (0.42), SI 80–85 (80), PW 0.35–0.45 (0.40), WL 0.66–0.80 (0.77) (10 measured).

Eye with 6 rows of ommatidia, and with 7–8 ommatidia in the longest row; EL 0.13–0.16 (EL/HW 0.26–0.29). MfL 0.44–0.56 (MfL/HW 0.96–1.01). Propodeal spiracle relatively small, diameter of annulus of propodeal spiracle is usually slightly less than the thickness of the propodeal spine at its midlength. Petiole node large, tall and characteristically shaped: in profile the dorsal surface of the peduncle is continuous with the anterior face of the node, the two run together through a very obtuse angle, so that the anterior face of the node slopes upwards and posteriorly only shallowly relative to the dorsum of the peduncle. The anterior face of the petiole node rises to the short, narrowly rounded dorsum, and the posterior face has about the same degree of slope as the anterior. Height of petiole node in posterior view (from midpoint of the dorsal margin of the foramen to the apex) 0.82–0.89 × its maximum width. In dorsal view postpetiole 1.10–1.18 × broader than long; maximum width of postpetiole 1.15–1.36 × the length of a propodeal spine; maximum width of postpetiole 0.90–1.00 × the distance between the apices of the propodeal spines. Length of postpetiole node in profile about equal to the height of the segment. Disc of postpetiole usually with some weak punctulate sculpture, especially on the posterior half. Full adult colour yellow.

Queen

(gyne). Only alates known; may be polygynous as several queens appears in one series. HL 0.65–0.70, HW 0.56–0.60, CI 86–88, SL 0.44–0.47, SI 77–79, PW 0.52–0.56, WL 0.90–0.98, maximum width of mesoscutum 0.50–054, maximum length of mesoscutum 0.48–0.53, MfL 0.56–0.60 (MfL/HW 0.85–1.00) (3 measured). With three distinct ocelli, a full complement of flight sclerites and a conspicuous sulcus across the mesopleuron. The shape of the petiole node parallels that seen in the worker.

Type Material

Holotype worker, Madagascar: Prov. Antsiranana, Forêt Bekaraoka, 6.8 km. 60° ENE Daraina, 7–9.xii.2003, 13°10.0’S, 49°42.6’E, sifted litter, tropical dry forest, BLF 9872(22), CASENT0044902 (Fisher et al.) (California Academy of Sciences). Paratypes. 1 worker and 1 dealate queen, with same data as holotype and all BLF 9872: worker, (2) CASENT0044917; queen, (2) CASENT0044916 (CASC).

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.