Difference between revisions of "Monomorium trake"

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==Identification==
 
==Identification==
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Bolton (1987) - One of only 6 species to combine 12-segmented antennae with the reduced form of eye described above, ''trake'' is isolated from the other five species sharing these characters by its very short antennal scapes, SI 73. In the remaining species (''[[Monomorium shilohense]]'', ''[[Monomorium rotundatum]]'', ''[[Monomorium sryetum]]'', ''[[Monomorium floricola]]'' and ''[[Monomorium inquietum]]'') SI is >75, usually >80. Other differentiating characters are noted under the names of the other five species.
  
 
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==Castes==
 
==Castes==
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===Worker===
 
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{{Nomenclature}}
 
{{Nomenclature}}
 
*''<span style='color:red;font-weight:bold;'>trake.</span> Monomorium trake'' Bolton, 1987: 417 (w.) GHANA.
 
*''<span style='color:red;font-weight:bold;'>trake.</span> Monomorium trake'' Bolton, 1987: 417 (w.) GHANA.
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===Description===
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====Worker====
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Holotype. TL 1.6, HL 0.39, HW 0.30, CI 77, SL 0.22, SI 73, PW 0.19, AL 0.40.
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Mandible equipped with three strong teeth and a minute offset basal denticle. Anterior clypeal margin more or less evenly convex between the inner borders of the mandibles, without a strongly differentiated prominent median section. Clypeal carinae feebly developed, widely divergent anteriorly. Eye in profile small, its length only slightly greater than its height and the maximum diameter of the eye 0.18 x HW. Ommatidia of eye arranged as an outer ring which surrounds a single longitudinal row, the encircled row consisting of only two ommatidia. In full-face view the eyes distinctly in front of the midlength of the sides. Antennal scapes relatively very short, SI < 75; when laid straight back from their insertions the scapes conspicuously failing to reach the occipital margin. Promesonotal dorsum evenly shallowly convex in profile, sloping posteriorly to the extremely feebly impressed metanotal groove. Propodeal spiracle small, pinhole-like. Node of petiole low and bluntly rounded dorsally, the anterior peduncle short and subtended by a strip-like ventral process which runs from close to the insertion to the strong posteroventral bulge of the petiole. Postpetiole smaller than petiole and only slightly more broadly rounded dorsally. Standing hairs present on all dorsal surfaces but everywhere sparse ; the promesonotum with 5 pairs, the propodeum with a single pair. Sculpture absent except for short cross-ribs at the metanotal groove. Colour uniform yellow except for apex of first gastral tergite which is traversed by a band of brown.
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Paratypes. TL 1.6, HL 0.38-0.39, HW 0.30, CI 77-79, SL 0.22, SI 73, PW 0.18-0.19, AL
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0.38-0.40 (3 measured). As holotype but maximum diameter of eye 0.17-0.18 x HW. Only one of the paratypes shows its full complement of alitrunk pilosity, the other two both show signs of abrasion.
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===Type Material===
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Holotype worker, Ghana: Aburi, 22.iii . 1969 (P. Room) ({{BMNH}}). Paratypes. 3 workers with same data as holotype (BMNH; {{MCZ}}).
 
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===Description===
 
  
 
==References==
 
==References==

Revision as of 20:18, 13 September 2019

Monomorium trake
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Monomorium
Species: M. trake
Binomial name
Monomorium trake
Bolton, 1987

Monomorium trake casent0235531 p 1 high.jpg

Monomorium trake casent0235531 d 1 high.jpg

Specimen Labels

Identification

Bolton (1987) - One of only 6 species to combine 12-segmented antennae with the reduced form of eye described above, trake is isolated from the other five species sharing these characters by its very short antennal scapes, SI 73. In the remaining species (Monomorium shilohense, Monomorium rotundatum, Monomorium sryetum, Monomorium floricola and Monomorium inquietum) SI is >75, usually >80. Other differentiating characters are noted under the names of the other five species.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: Central African Republic, Ghana (type locality), Uganda, United Republic of Tanzania.


Distribution based on AntMaps

AntMapLegend.png

Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Nomenclature

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

  • trake. Monomorium trake Bolton, 1987: 417 (w.) GHANA.

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

Description

Worker

Holotype. TL 1.6, HL 0.39, HW 0.30, CI 77, SL 0.22, SI 73, PW 0.19, AL 0.40.

Mandible equipped with three strong teeth and a minute offset basal denticle. Anterior clypeal margin more or less evenly convex between the inner borders of the mandibles, without a strongly differentiated prominent median section. Clypeal carinae feebly developed, widely divergent anteriorly. Eye in profile small, its length only slightly greater than its height and the maximum diameter of the eye 0.18 x HW. Ommatidia of eye arranged as an outer ring which surrounds a single longitudinal row, the encircled row consisting of only two ommatidia. In full-face view the eyes distinctly in front of the midlength of the sides. Antennal scapes relatively very short, SI < 75; when laid straight back from their insertions the scapes conspicuously failing to reach the occipital margin. Promesonotal dorsum evenly shallowly convex in profile, sloping posteriorly to the extremely feebly impressed metanotal groove. Propodeal spiracle small, pinhole-like. Node of petiole low and bluntly rounded dorsally, the anterior peduncle short and subtended by a strip-like ventral process which runs from close to the insertion to the strong posteroventral bulge of the petiole. Postpetiole smaller than petiole and only slightly more broadly rounded dorsally. Standing hairs present on all dorsal surfaces but everywhere sparse ; the promesonotum with 5 pairs, the propodeum with a single pair. Sculpture absent except for short cross-ribs at the metanotal groove. Colour uniform yellow except for apex of first gastral tergite which is traversed by a band of brown.

Paratypes. TL 1.6, HL 0.38-0.39, HW 0.30, CI 77-79, SL 0.22, SI 73, PW 0.18-0.19, AL 0.38-0.40 (3 measured). As holotype but maximum diameter of eye 0.17-0.18 x HW. Only one of the paratypes shows its full complement of alitrunk pilosity, the other two both show signs of abrasion.

Type Material

Holotype worker, Ghana: Aburi, 22.iii . 1969 (P. Room) (The Natural History Museum). Paratypes. 3 workers with same data as holotype (BMNH; Museum of Comparative Zoology).

References

  • Bolton, B. 1987. A review of the Solenopsis genus-group and revision of Afrotropical Monomorium Mayr (Hymenoptera: Formicidae). Bull. Br. Mus. (Nat. Hist.) Entomol. 54: 263-452 (page 417, worker described)