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Kollasmosoma sentum is a palearctic species. The first male of Kollasmosoma sentum was discovered in Orgiva in the province of Granada in Spain. The female holotype was discovered later in August 2010 in Madrid, at the site of the Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria followed by the collection of another seven females in September 2010.
K. sentum has a length of 1.8 to 2.1 millimetres (0.071 to 0.083 in) with forewing length from 1.1 to 1.4 millimetres (0.043 to 0.055 in). The antennae of all females have 12 segments. The face is convex and the head is bristly.
While the body of K. sentum is black in colour, the face, the face plate (clypeus), the labrum , the malar space (area between the compound eyes and the mandibles), the frons (antero-lateral and medial), the palps , the propleuron, the tegulae , the basal area of the wing and the front and center legs are coloured white.
The scape and pedicel of the antenna, and the tarsi of the hind legs are ivory coloured, the tarsi dorsally obscured. The sides of the pronotum have a brown spot laterally; in some individuals the pronotum may be colored brown also extended to the sides. The veins of the nearly transparent wings are brown, the remaining antenna segments, large parts of the humeral plate, the sides of the mesosoma , the parastigma and the pterostigma are colored extended dark brown. The mesosoma is about 10% longer than its height. The first tergite of the metasoma is 0.6 times as long as the width of the apex.
- The outer spine of the tibiae of the hind legs is normally built in females and apically pointed;
- the fifth sternite of the metasoma in females has an apical spine;
- the face is strongly convex;
- the compound eyes are about 3.6 times higher than the width of the temple;
- The dorsal side of the propodeum is shorter than the metanotum;
- the pedicel is distinctly pronounced in females &
- the tarsi of the front legs in the females are 1.9 times as long as the tarsi of the middle legs.
Females of Kollasmosoma sentum have been observed parasitising the ant Cataglyphis ibericus (Emery, 1906). Wasps act either singly or in a small group of two to three. They scout the nest entrances and areas nearby during the hottest hours of the day looking for worker ants on their way out to forage or while returning laden with food to the nest. The visits typically last from half an hour to 90 minutes. Cataglyphis ants move speedily along but have a characteristic pattern of brief halts which are used by the Kollasmosoma for attacking the ants.
- Cees van Achterberg & José-María Gómez Durán (2011). "Oviposition behaviour of four ant parasitoids (Hymenoptera, Braconidae, Euphorinae, Neoneurini and Ichneumonidae, Hybrizontinae), with the description of three new European species". ZooKeys 125: 59–106. doi:10.3897/zookeys.125.1754. PMC 3185369. PMID 21998538. Retrieved 10 October 2014.
- Colin Lecher (24 May 2012). "Gallery: The Top 10 New Species Of 2012". Popular Science. Retrieved 10 October 2014.
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