Vetulicola Explained

Vetulicola is an extinct genus of marine animal discovered from the Cambrian of China. It is the eponymous member of the enigmatic phylum Vetulicolia, which is of uncertain affinities but may belong to the deuterostomes. The name was derived from Vetulicola cuneata, the first species described by Hou Xian-guang in 1987 from the Lower Cambrian Chiungchussu Formation in Chengjiang, China.[1] [2]

Description

The type species, Vetulicola cuneata, as originally described by Hou Xian-guang in 1987, has a body plan similar to those of arthropods and composed of two distinct parts of approximately equal length.[3] The anterior part is rectangular with a carapace-like structure of four rigid cuticular plates, with a large mouth at the front end.[4] The posterior section is slender, strongly cuticularised and placed dorsally. Paired openings connecting the pharynx to the outside run down the sides. These features are interpreted as possible primitive gill slits. Vetulicola cuneata could be up to 9 cm long. The Vetulicola are thought to have been swimmers that were possible filter feeders.[5]

Other Vetulicola species described are Vetulicola rectangulata (Luo and Hu, 1999), V. gantoucunensis (Luo et al., 2005), V. monile (Aldridge et al., 2007), and V. longbaoshanensis (Yang et al., 2010). The mouth openings of all the other species are smaller, and do not protrude as in V. cuneata. All other species, with the stark exception of V. gantoucunensis, are smaller than the type species.

Taxonomy

Vetulicolas taxonomic position is controversial. V. cuneata was originally assigned to the phylum Arthropoda on the assumption that it was a bivalved arthropod like Canadaspis and Waptia, but the lack of legs, the presence of gill slits, and the four plates in the "carapace" were unlike any known arthropod.[6] In 2001, Degan Shu and his team reinterpreted the animals as deuterostomes placing Vetulicola in the new family Vetulicolidae, order Vetulicolida, and created a new phylum Vetulicolia.[7]

Shu later in 2003 argued that the vetulicolians were an early, specialized side-branch of deuterostomes.[8] Patricio Dominguez and Richard Jefferies classify Vetulicola as an urochordate, and probably a stem-group appendicularian.[9] In contrast, Nicholas J. Butterfield places Vetulicola among the arthropods.[10] The discovery of the related Australian vetulicolian Nesonektris, from the Lower Cambrian Emu Bay Shale of Kangaroo Island, and the reidentification of the "coiled gut" of vetulicolians as being a notochord affirms the identification as an urochordate.[11]

Etymology

Vetulicola is a compound Latin word composed of vetuli, meaning "old," or "ancient," and cola, meaning "inhabitant."[12]

Paleobiology

Vetulicola was the host of the symbiotic organism Vermilituus gregarius, which appears to have lived inside Vetulicolas anterior body. Only around 2% of Vetulicola individuals had Vermilituus infestations, but Vermilituus could be very numerous: one Vetulicola specimen had 88 individuals of Vermilituus infesting it. Such large numbers of symbiotic organisms were probably harmful to the host Vetulicola.

External links

Notes and References

  1. McMenamin . Mark A. S. . 2019 . Cambrian Chordates and Vetulicolians . Geosciences . en . 9 . 8 . 354 . 2019Geosc...9..354M . 10.3390/geosciences9080354 . 2076-3263 . free.
  2. Briggs . Derek E. G. . Fortey . Richard A. . 2005 . Wonderful strife: systematics, stem groups, and the phylogenetic signal of the Cambrian radiation . Paleobiology . en . 31 . 2_Suppl . 94–112 . 10.1666/0094-8373(2005)031[0094:WSSSGA]2.0.CO;2 . 44066226 . 0094-8373.
  3. Hou . Xian-guang . 1987 . Early Cambrian large bivalved arthropods from Chengjiang, Eastern Yunnan . Acta Palaeontologica Sinica . 26 . 3 . 272–285 . subscription . China Knowledge Network.
  4. Shu . D. G. . Conway Morris . S. . Han . J. . Chen . L. . Zhang . X. L. . Zhang . Z. F. . Liu . H. Q. . Li . Y. . Liu . J. N. . 2001-11-22 . Primitive deuterostomes from the Chengjiang Lagerstätte (Lower Cambrian, China) . Nature . 414 . 6862 . 419–424 . 2001Natur.414..419S . 10.1038/35106514 . 0028-0836 . 11719797 . 4345484.
  5. Li . Yujing . Williams . Mark . Harvey . Thomas H. P. . Wei . Fan . Zhao . Yang . Guo . Jin . Gabbott . Sarah . Fletcher . Tom . Hou . Xianguang . Cong . Peiyun . 2020-09-18 . Symbiotic fouling of Vetulicola, an early Cambrian nektonic animal . Communications Biology . 3 . 1 . 517 . 10.1038/s42003-020-01244-1 . 7501249 . 32948820.
  6. Shu . Degan . 2005 . On the Phylum Vetulicolia . Chinese Science Bulletin . en . 50 . 20 . 2342–2354 . 10.1007/BF03183746 . 2005ChSBu..50.2342S . 86827605 . 1001-6538.
  7. Shu . D. G. . Conway Morris . S. . Han . J. . Chen . L. . Zhang . X. L. . Zhang . Z. F. . Liu . H. Q. . Li . Y. . Liu . J. N. . 2001-11-22 . Primitive deuterostomes from the Chengjiang Lagerstätte (Lower Cambrian, China) . Nature . 414 . 6862 . 419–424 . 2001Natur.414..419S . 10.1038/35106514 . 0028-0836 . 11719797 . 4345484.
  8. Shu . Degan . 2003 . A paleontological perspective of vertebrate origin . Chinese Science Bulletin . 48 . 8 . 725–735 . 2003ChSBu..48..725S . 10.1007/BF03187041 . 85163902.
  9. Web site: Dominguez . P. . Jefferies . R. . 2006-08-13 . Fossil evidence on the origin of appendicularians. In: International Urochordate Meeting 2003, Carry le Rouet, France, October 11-15th . https://web.archive.org/web/20060813074439/http://nsm.fullerton.edu/~lamberts/ascidian/UromeetingAbstracts.html. 2023-03-02 . 2006-08-13 .
  10. Butterfield . Nicholas J. . 2003 . Exceptional fossil preservation and the Cambrian explosion . Integrative and Comparative Biology . 43 . 1 . 166–177 . 10.1093/icb/43.1.166 . 1540-7063 . 21680421. free .
  11. García-Bellido . Diego C. . Lee . Michael S. Y. . Edgecombe . Gregory D. . Jago . James B. . Gehling . James G. . Paterson . John R. . 2014-10-21 . A new vetulicolian from Australia and its bearing on the chordate affinities of an enigmatic Cambrian group . BMC Evolutionary Biology . 14 . 214 . 10.1186/s12862-014-0214-z . 1471-2148 . 4203957 . 25273382 . free .
  12. Lacalli . Thurston C. . 2002 . Vetulicolians—are they deuterostomes? chordates? . BioEssays . 24 . 3 . 208–211 . 10.1002/bies.10064 . 11891757.

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