The Ants of Africa
Genus Mystrium
Mystrium silvestrii Santschi

Mystrium silvestrii Santschi

return to key {link to the Hymenoptera Name Server} Type location Cameroun (Mystrium Silvestrii, n. sp., Santschi, 1914d: 310, illustrated, worker & queen) from Victoria, collector F. Silvestri, in 1913
worker and queen described (see Bolton, 1995) .

{Mystrium silvestrii}Santschi's description (1914d, 310, my translation) is at {original description}.
WORKER - TL 5.8 mm (without the mandibles). Colour dark rust brown. Anterior of head, mandibles, antennae, legs and gaster of a variable weak rust. Tarsi and gaster apex yellow. Matt. Head, thorax, petiole and basal gaster coarsely rugo-reticulate with large hair pits, with an underlying shiny surface, almost smooth, from which arises a single short, yellowish, squamose hair. On the base of the gaster the rugae become longitudinal without forming reticulations, effaced on the rest of the gaster segments which are finely and densely punctate with the basal area very finely transversely reticulate. Mandibles, antennae and femora more superficially rugo-reticulate, overall densely between the lines, save on the mandibles where the inter-reticulate spaces give rise to a short, simple hair. in large of gaster. The squamose hairs are much shorter than in M. voelztkowi Forel (from Madagascar) and notably more expanded on the body and femora; the hairs are ranged along the internal border of the mandibles. On the edges of the gaster the squamose hairs are rather longer and intermingled with long narrow hairs. The tarsae are spiny on the outer margins. Pubescence short, slender, sparse except on the funiculus.
Head wider than long, strongly scalloped posteriorly, sides convex behind and concave anteriorly, terminating anteriorly with two strong spines longer than in M. voelkztkowi. Vertex with a fairly deep depression. Eyes very small (smaller than in M. mysticum Roger, from Madagascar) and almost at the mid-point of the sides. Clypeus slightly longer and less abrupt than M. mysticum, anterior equally arcuate and denticulate. Scape just surpassing the midpoint of the sides of the head. Segments 9 and 10 of the funiculus narrower than long, segment 11 less than a quarter long than wide. Extremity of mandibles distinctly spatulate, more enlarged than in mysticum and voelztkowi. The teeth are smaller, with an upper range of about 11 reaching almost to the apex where the teeth are very low and very elongated. The thorax narrows about the mesonotum which is distinctly short from front to back. Pronotum as long as wide in its posterior third. Propodeum dorsum wider than long, angled at 115° to the declivity. Petiole node three times wider than long. Gaster slightly narrowed after the first segment, which is twice as wide as long. Legs short.
From Cameroun, Victoria, 3 workers and one female; collector F. Silvestri - the holotype can be seen at

Bolton (1973a) noted that this is the sole West African species, distributed throughout the forest zone, and nesting in soil.

{Mystrium silvestrii}The photomontage is collated from
Collection details - Central African Republic: Prefecture Sangha-Mbaéré; Parc National Dzanga-Ndoki, 37.9 km 169° S Lidjombo; 02°22'14"N 016°10'21"E 360m Collection Information: Collection codes: BLF4130. Date: 20-28 May 2001. Collected by: B.L.Fisher. Method: EC19 sifted litter. Habitat: rainforest. Transect Type: MW 50 sample transect, 5m Transect Sample No.: 30.

{Mystrium silvestrii}The photomontage is collated from
Collection Information: Specimen Code CASENT0102168; Locality Ghana: [Wiawso, W.R.; ant ecology sample w]; Collection codes: ANTC4445; Date: 26 Apr 1969; Collected by: D.Leston

© 2007, 2008, 2010, 2012 - Brian Taylor CBiol FSB FRES
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