Xanthopygus
Kraatz, 1857
Species Guides
1Xanthopygus is a of rove beetles (Staphylinidae: Staphylininae) established by Kraatz in 1857. The genus belongs to the subtribe Xanthopygina and is distributed across Mexico, Central America, the West Indies, and South America. A 2022 taxonomic revision by Chatzimanolis updated distributional records, resolved nomenclatural issues including synonymies and type designations, and provided an illustrated identification key for all . The genus is characterized by distinctive morphological features typical of the Xanthopygina, though specific diagnostic traits vary among species.
Pronunciation
How to pronounce Xanthopygus: //zænˈθɒpɪɡəs//
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Identification
Members of Xanthopygus can be distinguished from related using the identification key provided in Chatzimanolis (2022), which includes illustrations of all . The genus is placed in the subtribe Xanthopygina based on morphological characters of the Staphylinini tribe. Species-level identification requires examination of specific morphological features detailed in the revision.
Images
Distribution
Mexico, Central America, West Indies, and South America. Specific locality records include Parque Nacional Natural Serranía de Chiribiquete (PNNSCh) in Colombia.
Similar Taxa
- LampropygusFormerly treated as a separate ; Lampropygus giganteus was synonymized with Staphylinus luctuosus and the subgenus Heteropygus was validated within Xanthopygus, indicating close taxonomic relationship and historical confusion between these groups.
- BelonuchusBelonuchus pexus required neotype designation in the revision, suggesting historical taxonomic overlap or confusion with Xanthopygus that necessitated clarification.
Misconceptions
The name 'Xanthopygus' has been used in compound form for unrelated organisms, leading to potential confusion: (1) Cervus elaphus xanthopygus is a of red deer/Manchurian wapiti, not a ; (2) Dictyocaulus xanthopygus is a parasitic named after that deer subspecies; (3) Pardalotus xanthopygus is a bird (spotted pardalote). These share only the specific epithet 'xanthopygus' (yellow rump) and are unrelated to the beetle Xanthopygus.
More Details
Taxonomic History
The has undergone significant taxonomic revision. Chatzimanolis (2022) designated neotypes for Belonuchus pexus Motschulsky and Xanthopygus oliveirae Lynch, and lectotypes for Lampropygus major Bernhauer, Staphylinus xanthopygus Nordmann, and Xanthopygus cacti Horn. The type designation for subgenus Heteropygus Bernhauer was validated due to an invalid previous designation by Blackwelder.
Etymology Note
The name Xanthopygus derives from Greek 'xanthos' (yellow) and 'pyge' (rump/buttocks), referring to a yellowish terminal abdominal segment characteristic of some . The same etymological root appears independently in the red deer Cervus elaphus xanthopygus and the Dictyocaulus xanthopygus, creating no taxonomic relationship.
Sources and further reading
- BugGuide
- GBIF taxonomy match
- iNaturalist taxon
- NCBI Taxonomy
- Catalogue of Life
- Morphological and molecular description of Dictyocaulus xanthopygus sp. nov. (Nematoda: Trichostrongyloidea) from the Manchurian wapiti Cervus elaphus xanthopygus
- A revision of the genus Xanthopygus Kraatz (Staphylinidae: Xanthopygina)
- Endoparasites of red deer (Cervus elaphus xanthopygus) in the Trans-Baikal Territory
- Habitat selection by wapiti (Cervus elaphus xanthopygus) in Wandashan Mountains, China, based on habitat availability
- Foraging Behaviour of Pardalotes in South-Eastern Australia: Comparison of the TaxaPardalotus punctatus, P. xanthopygusandP. striatus‘striatus’, ‘ornatus’ and ‘substriatus’