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The ant genus Tetramorium Mayr in the Afrotropical region (Hymenoptera, Formicidae, Myrmicinae): synonymisation of Decamorium Forel under Tetramorium, and taxonomic revision of the T. decem species group.

Hita Garcia F, Fisher BL - Zookeys (2014)

Bottom Line: In this study we synonymise the genus Decamorium Forel under Tetramorium Mayr, revise the new T. decem species group by providing a diagnosis of the group, an illustrated identification key to species level, and worker-based species descriptions for all five species, which include diagnoses, discussions, images, and distribution maps.The following species are revised in this study: T. decem Forel, comb. r., T. raptor sp. n., T. uelense Santschi, comb. r., T. ultor Forel, comb. r., stat. r. & stat. n., and T. venator sp. n.In addition, we also designate lectotypes for T. decem, T. uelense, and T. ultor.

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Affiliation: Entomology Department, California Academy of Sciences, 55 Music Concourse Drive, San Francisco, CA 94118, U.S.A.

ABSTRACT
In this study we synonymise the genus Decamorium Forel under Tetramorium Mayr, revise the new T. decem species group by providing a diagnosis of the group, an illustrated identification key to species level, and worker-based species descriptions for all five species, which include diagnoses, discussions, images, and distribution maps. The following species are revised in this study: T. decem Forel, comb. r., T. raptor sp. n., T. uelense Santschi, comb. r., T. ultor Forel, comb. r., stat. r. & stat. n., and T. venator sp. n. In addition, we also designate lectotypes for T. decem, T. uelense, and T. ultor.

No MeSH data available.


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Head in full-face view and body in profile. A, BTetramorium decem (CASENT0914087) C, DTetramorium simulator (CASENT0914089).
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Figure 2: Head in full-face view and body in profile. A, BTetramorium decem (CASENT0914087) C, DTetramorium simulator (CASENT0914089).

Mentions: If one considers the whole tribe Tetramoriini, then it becomes apparent that the specialised habitus of Decamorium is not unique. Several authors have stated that Decamorium are specialised termite hunters, and that their specialised morphology could be an adaptation to such a dangerous lifestyle (Arnold 1917; Bolton 1976; Longhurst et al. 1979). Interestingly, both Arnold (1917) in the original description and later Bolton (1980) noted the similarities in general body shape and diet between members of Decamorium and the species Tetramorium simulator from South Africa. We agree that the similarities in morphology are indeed obvious, especially in profile view (Fig. 2). However, at present it is not clear whether the shared morphology is based on a close phylogenetic relationship between Decamorium and Tetramorium simulator or a result of convergent evolution due to a similar lifestyle hunting termites. We believe the latter more likely since the twelve-segmented antennae, the much broader head, and sculptured clypeus of Tetramorium simulator suggest a closer relationship to another group with twelve-segmented antennae than to Decamorium. Therefore, we hypothesise that both have evolved from different Tetramorium lineages and acquired the specialised habitus independently from each other. Another remarkable aspect is the lack of a strong and sharp clypeal shield in Tetramorium simulator, which seems to have been reduced in a manner almost similar, though less pronounced, to Decamorium.


The ant genus Tetramorium Mayr in the Afrotropical region (Hymenoptera, Formicidae, Myrmicinae): synonymisation of Decamorium Forel under Tetramorium, and taxonomic revision of the T. decem species group.

Hita Garcia F, Fisher BL - Zookeys (2014)

Head in full-face view and body in profile. A, BTetramorium decem (CASENT0914087) C, DTetramorium simulator (CASENT0914089).
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4042819&req=5

Figure 2: Head in full-face view and body in profile. A, BTetramorium decem (CASENT0914087) C, DTetramorium simulator (CASENT0914089).
Mentions: If one considers the whole tribe Tetramoriini, then it becomes apparent that the specialised habitus of Decamorium is not unique. Several authors have stated that Decamorium are specialised termite hunters, and that their specialised morphology could be an adaptation to such a dangerous lifestyle (Arnold 1917; Bolton 1976; Longhurst et al. 1979). Interestingly, both Arnold (1917) in the original description and later Bolton (1980) noted the similarities in general body shape and diet between members of Decamorium and the species Tetramorium simulator from South Africa. We agree that the similarities in morphology are indeed obvious, especially in profile view (Fig. 2). However, at present it is not clear whether the shared morphology is based on a close phylogenetic relationship between Decamorium and Tetramorium simulator or a result of convergent evolution due to a similar lifestyle hunting termites. We believe the latter more likely since the twelve-segmented antennae, the much broader head, and sculptured clypeus of Tetramorium simulator suggest a closer relationship to another group with twelve-segmented antennae than to Decamorium. Therefore, we hypothesise that both have evolved from different Tetramorium lineages and acquired the specialised habitus independently from each other. Another remarkable aspect is the lack of a strong and sharp clypeal shield in Tetramorium simulator, which seems to have been reduced in a manner almost similar, though less pronounced, to Decamorium.

Bottom Line: In this study we synonymise the genus Decamorium Forel under Tetramorium Mayr, revise the new T. decem species group by providing a diagnosis of the group, an illustrated identification key to species level, and worker-based species descriptions for all five species, which include diagnoses, discussions, images, and distribution maps.The following species are revised in this study: T. decem Forel, comb. r., T. raptor sp. n., T. uelense Santschi, comb. r., T. ultor Forel, comb. r., stat. r. & stat. n., and T. venator sp. n.In addition, we also designate lectotypes for T. decem, T. uelense, and T. ultor.

View Article: PubMed Central - HTML - PubMed

Affiliation: Entomology Department, California Academy of Sciences, 55 Music Concourse Drive, San Francisco, CA 94118, U.S.A.

ABSTRACT
In this study we synonymise the genus Decamorium Forel under Tetramorium Mayr, revise the new T. decem species group by providing a diagnosis of the group, an illustrated identification key to species level, and worker-based species descriptions for all five species, which include diagnoses, discussions, images, and distribution maps. The following species are revised in this study: T. decem Forel, comb. r., T. raptor sp. n., T. uelense Santschi, comb. r., T. ultor Forel, comb. r., stat. r. & stat. n., and T. venator sp. n. In addition, we also designate lectotypes for T. decem, T. uelense, and T. ultor.

No MeSH data available.


Related in: MedlinePlus