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Vetulicolidae; Temporal range: Cambrian Stage 3 PreꞒ Ꞓ O S D C P T J K Pg N
	Vetulicola gantoucunensis Ooedigera peeli Vetulicola rectangulata Beidazoon venustum Fossils and reconstructions of Vetulicolids
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade?:	†Vetulicolia
Class:	†Vetulicolida
Order:	†Vetulicolata
Family:	†Vetulicolidae; Hou and Bergström 1997
Type genus
	†Vetulicola; Hou 1987
Genera
	†Vetulicola Hou 1987 ; †Beidazoon Shu 2005 ; †Ooedigera Vinther et al. 2011 ;

Vetulicolidae is a vetulicolian family from the Cambrian Stage 3 Maotianshan Shale and Sirius Passet Lagerstätte that consists of Vetulicola, Beidazoon, and Ooedigera.^[1] It is distinguished from the Didazoonidae by a harder body wall and the lack of an oral disc.^[2]

Description

Members of the Vetulicolidae have relatively robust body coverings, with a subquadrate to elongate (in lateral view) anterior part and an elongate, segmented posterior part. The marginal zone of the anterior part may have short projections dorsally and postereodorsally.^[2] As diagnosed by Aldridge et al. in 2007, the anterior part is said to bear five annulations, and a lateral groove is not mentioned for the family. However, with and the addition of Ooedigera not all genera possess annulations in the anterior section,^[3] and with the re-classification of Yuyuannozoon^[1] each genus currently assigned to this family bears a lateral groove.^[4]^[5]^[6]^[3]

Vetulicolids range in size from Beidazoon (around 1 cm long) to Vetulicola (around 8 or 9 cm).^[1] Ooedigera is in-between at a little over 4cm.^[7] The anterior parts of Ooedigera and Beidazoon bear textural ornamentation.^[8]

Distribution

Ooedigera is known from the Sirius Passet Lagerstätte in far northern Greenland, while Beidazoon is known only from the Chengjiang fauna. Vetulicola is known from the Chengjiang fauna, the Guanshan biota (both of the Maotianshan Shales of China), as well as the Mural Formation of the Canadian Rockies. The Banffozoa have a similar distribution, while the Didazoonidae are limited to the Maotianshan Shales.^[1]^[2]

Taxonomy

The composition of the Vetulicolidae has seen several changes. Yuyuanozoon was at one point placed in the family,^[9] but has since been moved to the Didazoonidae.<name=Li2018 /> Beidazoon was initialy placed in its own family, Beidazoonidae,^[10] but its junior synonym Bullivetula was placed in the Vetulicolidae^[11] and later authors have followed that placement.^[1]

A 2024 study has found Vetulicolidae (as defined in a 2018 phylogeny)^[1] to be a monophyletic group within a paraphyletic Vetulicolia, crownwards of Banffozoa and Nesonektris but basal to Didazoonidae. It is the only vetulicolian family that was recovered as a monophyletic clade:^[12]

Chordata

Banffia†

Heteromorphus†

Skeemella†

Nesonektris†

Vetulicolidae†

Ooedigera†

Vetulicola cuneata†

Vetulicola gantoucunensis†

Vetulicola longbaoshanensis†

Vetulicola rectangulata†

	Vetulicola monile†

	Beidazoon†

Didazoon†

Pomatrum†

Yuyuanozoon†

Yunnanozoon†

	Cathaymyrus†

	Pikaia†

	Chordata (crown group)

(total group)

"Banffozoa"

"Didizaoonidae"

An earlier study in 2014 placed vetulicolians as the sister-group to tunicates, but was unable to resolve any relationships among vetulicolians as a group:^[13]

Vetulicolia†

	Vetulicola†	"Vetulicolidae"

	Beidazoon†

	Ooedigera†

	Pomatrum† / Xidazoon†

	Didazoon†

	Yuyuanozoon†

	Banffia†

	Heteromorphus†

	Nesonektris†

Tunicata

References

^ ^a ^b ^c ^d ^e ^f Li et al. 2018, pp. 1083–1084
^ ^a ^b ^c Aldridge et al. 2007, p. 133
^ ^a ^b Vinther, Smith & Harper 2011, p. 712
^ Aldridge et al. 2007, pp. 134, 138, 142
^ Yang et al. 2010, p. 61
^ Luo et al. 2005, p. 3
^ Vinther, Smith & Harper 2011, p. 713
^ Vinther, Smith & Harper 2011, p. 714
^ Aldridge et al. 2007, pp. 142–145
^ Shu 2005, pp. 2346–2349
^ Aldridge et al. 2007, pp. 140–142
^ Mussini et al. 2024, pp. 6–7
^ García-Bellido et al. 2014, p. 9

Works cited

Aldridge, Richard J.; Hou, Xian-guang; Siveter, David J.; Siveter, Derek J.; Sarah E., Gabbott (2007). "The systematics and phylogenetic relationships of vetulicolians". Palaeontology. 50: 131–168. doi:10.1111/j.1475-4983.2006.00606.x. S2CID 85722738.
García-Bellido, Diego C.; Lee, Michael S. Y.; Edgecombe, Gregory D.; Jago, James B.; Gehling, James G.; Paterson, John R. (2014). "A new vetulicolian from Australia and its bearing on the chordate affinities of an enigmatic Cambrian group". BMC Evolutionary Biology. 14: 214. doi:10.1186/s12862-014-0214-z. PMC 4203957. PMID 25273382.
Hou, Xian-guang; Siveter, David J.; Siveter, Derek J.; Aldridge, Richard J.; Cong, Pei-yun; Gabbott, Sarah; Ma, Xiao-ya; Purnell, Mark A.; Williams, Mark (2017). "Vetulicolians". The Cambrian Fossils of Chengjiang, China: The Flowering of Early Animal Life (2 ed.). pp. 272–281. doi:10.1002/9781118896372.ch25.
Li, Yujing; Williams, Mark; Gabbott, Sarah E.; Chen, Ailen; Cong, Peiyun; Hou, Xianguang (2018). "The enigmatic metazoan Yuyuanozoon magnificissimi from the early Cambrian Chengjiang Biota, Yunnan Province, South China". Journal of Paleontology. 92 (6): 1081–1091. doi:10.1017/jpa.2018.18.
Luo, Huilin; Fu, Xiaoping; Hu, Shixue; Li, Yong; Chen, Liangzhong; You, Ting; Liu, Qi (February 2005). "New Vetulicoliids from the Lower Cambrian Guanshan Fauna, Kunming". Acta Geologica Sinica. 79 (1). doi:10.1111/j.1755-6724.2005.tb00860.x.
Mussini, G.; Smith, M. P.; Vinther, J.; Rahman, I. A.; Murdock, D. J. E.; Harper, D. A. T.; Dunn, F. S. (2024). "A new interpretation of Pikaia reveals the origins of the chordate body plan". Current Biology. 34 (13): 2980–2989.e2. doi:10.1016/j.cub.2024.05.026. PMID 38866005.
Shu, Degan (October 2005). "On the Phylum Vetulicolia". Chinese Science Bulletin. 50: 2342–2354. doi:10.1007/BF03183746. Retrieved 1 October 2024.
Vinther, J.; Smith, M. P.; Harper, D. A. T. (2011). "Vetulicolians from the Lower Cambrian Sirius Passet Lagerstätte, North Greenland, and the polarity of morphological characters in basal deuterostomes". Palaeontology. 54 (3): 711–719. Bibcode:2011Palgy..54..711V. doi:10.1111/j.1475-4983.2011.01034.x. S2CID 85602402.
Yang, Jie; Hou, Xiang-guang; Cong, Pei-yun; Dong, Wei; Zhang, Yan-xia; Luo, Mao-bin (2010). "A new vetulicoliid from lower Cambrian, Kunming, Yunnan". Acta Palaeontologica Sinica. 49 (1): 54–63.