Crematogaster sisa

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Crematogaster sisa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Crematogaster
Species: C. sisa
Binomial name
Crematogaster sisa
Blaimer, 2010

Crematogaster sisa casent0193245 p 1 high.jpg

Crematogaster sisa casent0193245 d 1 high.jpg

Specimen Labels

Rarely collected but appears to be an endemic high elevation Madagascar species.

Identification

This species is easily distinguished morphologically by its uniquely shaped subpetiolar process in form of an acute tooth.

Keys including this Species

Distribution

Madagascar: Only known from two localities in the rugged and isolated Manongarivo massif (Blaimer 2010).

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

Collections of foraging workers were made while sifting litter and beating vegetation in montane rainforest habitats at 1580 and 1860 m. No nest collections have yet been recorded for this species, thus reproductives and natural history are entirely unknown. (Blaimer 2010)

Castes

Nomenclature

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

  • sisa. Crematogaster sisa Blaimer, 2010: 29, figs. 33, 39 (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

Measurements (n=10). HW 0.89–1.14; HL 0.81–1.08; EL 0.21–0.27; SL 0.73–0.84; WL 0.91–1.12; SPL 0.16–0.24; PTH 0.16–0.23; PTL 0.24–0.31; PTW 0.26–0.35; PPL 0.17–0.22; PPW 0.24–0.33; LHT 0.71–0.90; CI 1.05–1.17; OI 0.22–0.28; SI 0.78–0.90; SPI 0.17–0.21; PTHI 0.65–0.83; PTWI 0.91–1.24; PPI 1.33–1.53; LBI 1.23–1.30.

Medium to large species (HW 0.89–1.14, WL 0.91–1.12).

Masticatory margin of mandibles with 5 teeth; posterior margin of head straight or medially depressed, laterally forming gentle round corners; 1–3 ocelli sometimes present on large workers; antennal scapes just surpassing posterior margin of head; midline of eyes situated at midline of head in full face view.

Pronotum laterally angular; promesonotal suture usually complete, and distinctly and broadly impressed, continuing laterally to mesopleural spiracle and thereby constricting mesonotum in relation to pronotum; dorsum of promesonotum more or less flat in lateral view; antero-medial portion of mesonotum slightly raised with respect to pronotum, but not tuberculate; dorsum of mesonotum flat, lateral portion broadly angular; mesonotum postero-laterally angular or tuberculate, and with a distinct to indistinct posterior face; propodeal spines small to medium sized (SPI 0.17–0.21), half as long to as long as width between their bases, evenly tapering, straight or weakly down-curved, in dorsal view weakly diverging; petiole in dorsal view trapezoidal or suboval, weakly lobed or rounded, laterally weakly carinate, with weak postero-lateral tubercle; dorsum of petiole weakly concave; subpetiolar process articulated as acute and distinct antero-ventral tooth, but rarely may be present as only a minute tooth.

Type Material

Holotype worker. Madagascar: R.S. Manongarivo, -14.02167, 48.41833, 1580m, 27.x.1998, sifted litter (leaf mold, rotten wood), montane rainforest, B.L.Fisher#1970(49)-2 (CASENT0193556) (deposited in California Academy of Sciences).

Paratypes. 4w, same locality and collection data as holotype (B.L.Fisher#1970(49)-2, CASENT0193557, CASENT0193542 and CASENT0193543; #1972(11)-1, CASENT0193009) (deposited in Museum of Comparative Zoology, South African Museum, Musee d'Histoire Naturelle Genève, University of California, Davis).

Etymology

“Sisa” is Malagasy for “remnant” and this species is named in allusion to its isolated distribution. “Sisa” is used in this combination as a noun in apposition.

References