Biology:Legrandella
| Legrandella | |
|---|---|
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| Reconstruction of Legrandella lombardii | |
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| Fossils of L. lombardii, holotype (A–C, E, F) and plastoparatype (D) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Clade: | Euchelicerata |
| Clade: | Prosomapoda |
| Genus: | †Legrandella Eldredge, 1974 |
| Type species | |
| †Legrandella lombardii Eldredge, 1974
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Legrandella is a genus of synziphosurine,[1] a paraphyletic group of fossil chelicerate arthropods.[2][3] Legrandella was regarded as part of the clade Prosomapoda.[2][4][5][6][3][7] Fossils of the single and type species, L. lombardii, have been discovered in deposits of the Devonian period in Cochabamba, Bolivia.[7][2]
The prosoma of Legrandella covered by a vaulted carapace with anterior projection, blunt genal cornua (posterolateral corners), humped cardiac lobe and pairs of radiated grooves.[1] Alongside Pseudoniscus roosevelti, Legrandella lombardii is one of the few synziphosurine species that confirmed to have lateral compound eyes.[8] The eyes are slit-like, located just below the ophthalmic ridges on each side of the carapace.[1] The opisthosoma is externally 11-segmented, subdivided into a 8-segmented preabdomen and 3-segmented postabdomen.[1] Tergite of the 1st preabdomimal segment is a reduced microtergite while the remaining 7 tergite possess axial nodes and spine-like tergopleurae (lateral extension).[1] each of the postabdominal segment is cylindrical and bore reduced tergopleurae.[1] The telson is triangular in cross section, but the distal region is yet to be discovered.[1]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Eldredge, Niles; Smith, LeGrande (1974) (in en-US). Revision of the suborder Synziphosurina (Chelicerata, Merostomata) : with remarks on merostome phylogeny. American Museum novitates ; no. 2543. http://digitallibrary.amnh.org/handle/2246/2745.
- ↑ 2.0 2.1 2.2 Lamsdell, James C. (2013). "Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura". Zoological Journal of the Linnean Society 167 (1): 1–27. doi:10.1111/j.1096-3642.2012.00874.x. ISSN 0024-4082.
- ↑ 3.0 3.1 Bicknell, Russell D. C.; Pates, Stephen (2020). "Pictorial Atlas of Fossil and Extant Horseshoe Crabs, With Focus on Xiphosurida" (in en). Frontiers in Earth Science 8: 98. doi:10.3389/feart.2020.00098. ISSN 2296-6463. Bibcode: 2020FrEaS...8...98B.
- ↑ Selden, Paul A.; Lamsdell, James C.; Qi, Liu (2015). "An unusual euchelicerate linking horseshoe crabs and eurypterids, from the Lower Devonian (Lochkovian) of Yunnan, China" (in en). Zoologica Scripta 44 (6): 645–652. doi:10.1111/zsc.12124. ISSN 0300-3256. https://www.academia.edu/14633144.
- ↑ Lamsdell, James C.; Briggs, Derek E. G.; Liu, Huaibao P.; Witzke, Brian J.; McKay, Robert M. (2015). "A new Ordovician arthropod from the Winneshiek Lagerstätte of Iowa (USA) reveals the ground plan of eurypterids and chasmataspidids" (in en). The Science of Nature 102 (9–10): 63. doi:10.1007/s00114-015-1312-5. ISSN 0028-1042. PMID 26391849. Bibcode: 2015SciNa.102...63L. https://www.researchgate.net/publication/282127302.
- ↑ Bicknell, Russell D. C.; Lustri, Lorenzo; Brougham, Tom (2019-12-01). "Revision of "Bellinurus" carteri (Chelicerata: Xiphosura) from the Late Devonian of Pennsylvania, USA" (in en). Comptes Rendus Palevol 18 (8): 967–976. doi:10.1016/j.crpv.2019.08.002. ISSN 1631-0683.
- ↑ 7.0 7.1 Dunlop, J. A.; Penney, D.; Jekel, D. (2020). "A summary list of fossil spiders and their relatives". World Spider Catalog. Natural History Museum Bern. pp. 1–296. http://www.wsc.nmbe.ch/resources/fossils/Fossils20.5.pdf.
- ↑ Bicknell, Russell D. C.; Amati, Lisa; Ortega-Hernández, Javier (2019-11-14). "New insights into the evolution of lateral compound eyes in Palaeozoic horseshoe crabs" (in en). Zoological Journal of the Linnean Society 187 (4): 1061–1077. doi:10.1093/zoolinnean/zlz065. ISSN 0024-4082. https://www.researchgate.net/publication/335016132.
Wikidata ☰ Q48968007 entry
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