Biology:Legionaris
Legionaris is an extinct genus of ticks in the family Nuttalliellidae.[1] The genus is currently monotypic, being represented only by the fossil species Legionaris robustus.
Systematics
Legionaris was described alongside a growing number of basal tick fossil species. The genus name, Legionaris, refers to the "ever-expanding list of genera and species that belong to the larger Nuttalliellidae family". The description of the genus was a compelling factor in collapsing other similar fossil species, including the Deinocrotonidae,[2] into the Nuttalliellidae.[1][3] Legionaris is now one of three genera placed in the Nuttalliellidae, alongside Nuttalliella and Deinocroton. The shared characters circumscribing the family are:[1]
"a pseudo-scutum/pseudo-conscutum, convoluted structure of the integument, sub-terminal mouthparts with arising of segments II–IV from the anterior segment and leg joints that extend deep into the preceding cavity, either as ball-and-socket (Nuttalliella, Legionaris) or approximating a socket joint (Deinocroton)".
As such, the Nuttalliellidae are distinguished from the Khimairidae, which are most notably characterised by an integumented body together with a true scutum.[3]
Description
Legionaris robustus is most clearly characterised with reference to its legs, which are highly robust, with enlarged segmentation, hence the species name. Leg joints are condylar, with ovoid distal regions at articulation site. The basis capitulum is not visible dorsally, palpal article I is greatly enlarged, with palpal articles II-IV arising from the anterior segments. The genital aperture is laterally elongate and bipartite.[1]
References
- ↑ 1.0 1.1 1.2 1.3 Chitimia-Dobler, Lidia; Handschuh, Stephan; Dunlop, Jason A.; Pienaar, Ronel; Mans, Ben J. (2024). "Nuttalliellidae in Burmese amber: implications for tick evolution" (in en). Parasitology 151 (9): 891–907. doi:10.1017/S0031182024000477. ISSN 0031-1820. PMC 11770530. https://www.cambridge.org/core/journals/parasitology/article/nuttalliellidae-in-burmese-amber-implications-for-tick-evolution/0D40B9D36B4ED714DFAB803339271D1E.
- ↑ Peñalver, Enrique; Arillo, Antonio; Delclòs, Xavier; Peris, David; Grimaldi, David A.; Anderson, Scott R.; Nascimbene, Paul C.; Pérez-de la Fuente, Ricardo (2017-12-12). "Ticks parasitised feathered dinosaurs as revealed by Cretaceous amber assemblages" (in en). Nature Communications 8 (1): 1924. doi:10.1038/s41467-017-01550-z. ISSN 2041-1723. PMID 29233973.
- ↑ 3.0 3.1 Chitimia-Dobler, Lidia; Mans, Ben J.; Handschuh, Stephan; Dunlop, Jason A. (2022). "A remarkable assemblage of ticks from mid-Cretaceous Burmese amber" (in en). Parasitology 149 (6): 820–830. doi:10.1017/S0031182022000269. ISSN 0031-1820. PMID 35241194.
Wikidata ☰ Q136649563 entry
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