Xandarella

Xandarella; Temporal range: Cambrian stage 3–Cambrian Stage 5 PreꞒ Ꞓ O S D C P T J K Pg N
	Drawing of X. spectaculum
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
(unranked):	†Artiopoda
(unranked):	†Xandarellida
Genus:	†Xandarella; Hou et al. 1991
Type species
	Xandarella spectaculum; Hou et al. 1991
Other species
	Xandarella mauretanica Ortega-Hernández et al, 2017

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

X. mauretanica type specimen, showing biaramous appendages

Drawing of the ventral morphology of X. mauretanica

References

Hou, Xianguang. (1997). Arthropods of the Lower Cambrian Chengjiang fauna, southwest China. Univ.-Forl. ISBN 82-00-37693-1. OCLC 614008940.
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. doi:10.1038/srep42616. ISSN 2045-2322. PMC 5314411. PMID 28211461.
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.

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[1] Hou, Xianguang. (1997). Arthropods of the Lower Cambrian Chengjiang fauna, southwest China. Univ.-Forl. ISBN 82-00-37693-1. OCLC 614008940.

[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. doi:10.1038/srep42616. ISSN 2045-2322. PMC 5314411. PMID 28211461.

[3] 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.