Xandarella is an extinct genus of xandarellid artiopodan known from the Cambrian of China, the type species Xandarella spectaculum was described in 1991 from the Cambrian Stage 3 aged Chengjiang Biota in China.[1] Although an additional species Xandarella mauretanica was described from the Cambrian Stage 5 Tatelt Formation in Morocco in 2017, which preserved only the ventral anatomy,[2] it is later found that is a species of trilobite Gigoutella instead.[3] Like other Xandarellids, the exoskeleton is unmineralised. The cephalon has pronounced eye slits, presumably derived from ancestral ventral stalked eyes.[4]

References

  1. ^ Xianguang, Hou; Ramsköld, Lars; Bergström, Jan (October 1991). "Composition and preservation of the Chengjiang fauna –a Lower Cambrian soft‐bodied biota". Zoologica Scripta. 20 (4): 395–411. doi:10.1111/j.1463-6409.1991.tb00303.x.
  2. ^ Ortega-Hernández, Javier; Azizi, Abdelfattah; Hearing, Thomas W.; Harvey, Thomas H. P.; Edgecombe, Gregory D.; Hafid, Ahmid; El Hariri, Khadija (March 2017). "A xandarellid artiopodan from Morocco – a middle Cambrian link between soft-bodied euarthropod communities in North Africa and South China". Scientific Reports. 7 (1): 42616. Bibcode:2017NatSR...742616O. doi:10.1038/srep42616. ISSN 2045-2322. PMC 5314411. PMID 28211461.
  3. ^ El Albani, Abderrazak; Mazurier, Arnaud; Edgecombe, Gregory D.; Azizi, Abdelfattah; El Bakhouch, Asmaa; Berks, Harry O.; Bouougri, El Hafid; Chraiki, Ibtissam; Donoghue, Philip C. J.; Fontaine, Claude; Gaines, Robert R.; Ghnahalla, Mohamed; Meunier, Alain; Trentesaux, Alain; Paterson, John R. (2024-06-28). "Rapid volcanic ash entombment reveals the 3D anatomy of Cambrian trilobites". Science. 384 (6703): 1429–1435. doi:10.1126/science.adl4540. ISSN 0036-8075.
  4. ^ Chen, Xiaohan; Ortega-Hernández, Javier; Wolfe, Joanna M.; Zhai, Dayou; Hou, Xianguang; Chen, Ailin; Mai, Huijuan; Liu, Yu (December 2019). "The appendicular morphology of Sinoburius lunaris and the evolution of the artiopodan clade Xandarellida (Euarthropoda, early Cambrian) from South China". BMC Evolutionary Biology. 19 (1): 165. doi:10.1186/s12862-019-1491-3. ISSN 1471-2148. PMC 6685191. PMID 31387545.


Allikas: https://en.wikipedia.org/wiki/Xandarella
No tags for this post.