Biology:Dasyleptus
Dasyleptus is an extinct genus of wingless insects, and the only member of the family Dasyleptidae and order or suborder Monura. They resembled juveniles of their modern relatives and had a single lengthy filament projecting from the end of the abdomen. They also had a pair of leg-like cerci and some non-ambulatory abdominal appendages. The largest specimens reached 30 millimetres (1.2 in) or more, not counting the length of the filament.[1] Dasyleptus species are mostly known only from the Late Carboniferous and Permian, but one species recorded from the Middle Triassic indicates that they survived the Permian–Triassic extinction event.[2] Dasyleptus and Monura are now typically treated as members of the living order Archaeognatha,[3][4] though this placement was questioned in a 2026 study, which found it to be a stem-group insect and the most primitive insect known.[5]
Taxonomy
The genus includes the following species:[3][6]
- Dasyleptus artinskianus Engel, 2009 – Early Permian (Artinskian), Wellington Formation, Kansas, United States
- Dasyleptus brongniarti Sharov, 1957 – Middle Permian (Roadian), Mitina Formation, Kuznetsk Basin, Russia
- Dasyleptus lucasi Brongniart, 1885 (type species) – Late Carboniferous (Gzhelian), Commentry Shales, France
- Dasyleptus noli Rasnitsyn, 2000 – Late Carboniferous (Gzhelian), Commentry Shales, France
- Dasyleptus rowlandi Rasnitsyn in Rasnitsyn et al., 2004 – Early Permian (Asselian), Bursum Formation, New Mexico, United States
- Dasyleptus sharovi (Durden, 1978) – Early Permian (Artinskian), Wellington Formation, United States
- Dasyleptus sinensis Liu et al., 2021[7] – Late Permian/Early Triassic, Kayitou Formation, China
- Dasyleptus triassicus Bechly & Stockar, 2011 – Middle Triassic (Ladinian), Meride Limestone, Monte San Giorgio, Switzerland
Phylogeny
Position of Dasyleptus after Tihelka et al. 2026, placing it outside of the Archaeognatha and crown insects as a whole.[5]
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See also
- Tonganoxichnus, a trace fossil attributed to Monura
References
- ↑ Hoell, H.V.; Doyen, J.T.; Purcell, A.H. (1998). Introduction to Insect Biology and Diversity (2nd ed.). Oxford University Press. p. 321. ISBN 0-19-510033-6.
- ↑ Prokop, Jakub; Nel, André; Engel, Michael S. (2023). "Diversity, Form, and Postembryonic Development of Paleozoic Insects". Annual Review of Entomology 68 (1): 401-429. doi:10.1146/annurev-ento-120220-022637.
- ↑ 3.0 3.1 Bechly, G.; Stockar, R. (2011). "The first Mesozoic record of the extinct apterygote insect genus Dasyleptus (Insecta: Archaeognatha: Monura: Dasyleptidae) from the Triassic of Monte San Giorgio (Switzerland)". Palaeodiversity 4: 23–37. https://bechly.lima-city.de/Palaeodiversity_4_BechlyStockar.pdf.
- ↑ "Suborder †Monura Sharov 1957". The Paleobiology Database. https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=193852&is_real_user=1.
- ↑ 5.0 5.1 Tihelka, Erik; Vásquez, Carlos; Engel, Michael S.; Schram, Frederick R.; Lozano-Fernandez, Jesus; Cai, Chenyang (2026-08-26). "Amphibious stem-insect sheds light on colonization of land" (in en). Nature. doi:10.1038/s41586-026-10961-2. ISSN 0028-0836. https://www.nature.com/articles/s41586-026-10961-2.
- ↑ Zhang, Weiting; Li, Hu; Shih, Chungkun; Zhang, Aibing; Ren, Dong (August 2018). "Phylogenetic analyses with four new Cretaceous bristletails reveal inter-relationships of Archaeognatha and Gondwana origin of Meinertellidae". Cladistics 34 (4): 384–406. doi:10.1111/cla.12212. PMID 34649368.
- ↑ Gui-Chun Liu; Hua Zhang; Chen-Yang Cai; Ai-Hua Yuan; Yu-Qing Zheng; Di-Ying Huang (2019). "The bristletail genus Dasyleptus (Insecta: Archaeognatha: Dasyleptidae) from the Upper Permian-Lower Triassic Kayitou Formation of SouthWestern China". Historical Biology: An International Journal of Paleobiology 33 (8): 1292–1296. doi:10.1080/08912963.2019.1692342.
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