Skip to main content
×
×
Home

Morphology of the radiodontan Lyrarapax from the early Cambrian Chengjiang biota

  • Peiyun Cong (a1), Allison C. Daley (a2) (a3), Gregory D. Edgecombe (a4), Xianguang Hou (a1) and Ailin Chen (a1) (a5)...
Abstract

The recently described radiodontan Lyrarapax unguispinus Cong et al., 2014 from the Chengjiang biota (Cambrian Series 2, Stage 3) highlighted a new morphological type of frontal appendage and unique mouth structures, a functional combination reinforcing the diversification of feeding strategies of radiodontans during the early Cambrian. Here we describe Lyrarapax trilobus n. sp. from the same fossil Konservat-Lagerstätte. The new species differs from L. unguispinus in the morphology and distribution of endites on the frontal appendage and the strengthening structure of the body flaps. The two species resemble each other in body shape (pattern of flap size), neck segment number, cephalic plates, and most importantly a mouth characterized by concentric wrinkled furrows. The latter confirms that a soft mouth without sclerotized plates is a real feature of Lyrarapax and supports the idea that oral structures provide valid diagnostic characters within Radiodonta.

Copyright
References
Hide All
Aria, C., Caron, J., and Gaines, R., 2015, A large new leanchoiliid from the Burgess Shale and the influence of inapplicable states on stem arthropod phylogeny: Palaeontology, v. 58, p. 629660.
Bergström, J., 1986, Opabinia and Anomalocaris, unique Cambrian ‘arthropods’: Lethaia, v. 19, p. 241246.
Bergström, J., 1987, The Cambrian Opabinia and Anomalocaris : Lethaia, v. 20, p. 187188.
Budd, G.E., 1993, A Cambrian gilled lobopodian from Greenland: Nature, v. 364, p. 709711.
Budd, G.E., 1998, Arthropod body-plan evolution in the Cambrian with an example from anomalocaridid muscle: Lethaia, v. 31, p. 197210.
Chen, J., Ramsköld, L., and Zhou, G., 1994, Evidence for monophyly and arthropod affinity of Cambrian giant predators: Science, v. 264, p. 13041308.
Chen, J., Zhou, G., Zhu, M., and Yeh, K., 1997, The Chengjiang Biota, A Unique Window of the Cambrian Explosion, Taichung, National Museum of Natural Science, 222 p. [in Chinese].
Collins, D., 1996, The “evolution” of Anomalocaris and its classification in the arthropod class Dinocarida (nov.) and order Radiodonta (nov.): Journal of Paleontology, v. 70, p. 280293.
Cong, P., Ma, X., Hou, X., Edgecombe, G.D., and Strausfeld, N.J., 2014, Brain structure resolves the segmental affinity of anomalocaridid appendages: Nature, v. 513, p. 538542.
Daley, A.C., and Bergström, J., 2012, The oral cone of Anomalocaris is not a classic “peytoia”: Naturwissenschaften, v. 99, p. 501504.
Daley, A.C., and Budd, G.E., 2010, New anomalocaridid appendages from the Burgess Shale, Canada: Palaeontology, v. 53, p. 721738.
Daley, A.C., and Edgecombe, G.D., 2014, Morphology of Anomalocaris canadensis from the Burgess Shale: Palaeontology, v. 88, p. 6891.
Daley, A.C., and Peel, J.S., 2010, A possible anomalocaridid from the Cambrian Sirius Passet Lagerstätte, North Greenland: Journal of Paleontology, v. 84, p. 352355.
Daley, A.C., Budd, G.E., Caron, J.-B., Edgecombe, G.D., and Collins, D., 2009, The Burgess Shale anomalocaridid Hurdia and its significance for early euarthropod evolution: Science, v. 323, p. 15971600.
Daley, A.C., Budd, G.E., and Caron, J.-B., 2013a, The morphology and systematics of the anomalocaridid Hurdia from the Middle Cambrian of British Columbia and Utah: Journal of Systematic Palaeontology, v. 11, p. 743787.
Daley, A.C., Paterson, J.R., Edgecombe, G.D., García-Bellido, D.C., and Jago, J.B., 2013b, New anatomical information on Anomalocaris from the Cambrian Emu Bay Shale of South Australia and a reassessment of its inferred predatory habits: Palaeontology, v. 56, p. 971990.
Edgecombe, G.D., García-Bellido, D.C., and Paterson, J.R., 2011, A new leanchoiliid megacheiran arthropod from the Lower Cambrian Emu Bay Shale, South Australia: Acta Palaeontologica Polonica, v. 56, p. 385400.
Hou, X., and Bergström, J., 1997, Arthropods of the Lower Cambrian Chengjiang fauna, southwest China, Fossils and Strata, No. 45 116 p.
Hou, X., Bergström, J., and Ahlberg, P., 1995, Anomalocaris and other large animals in the Lower Cambrian Chengjiang Fauna of southwest China: GFF, v. 117, p. 163183.
Hou, X., Aldridge, R.J., Bergström, J., Siveter, D.J., Siveter, D.J., and Feng, X., 2004, The Cambrian fossils of Chengjiang, China - the flowering of early animal life, Oxford, Blackwell Science, xii + 233p.
Hu, S., 2005, Taphonomy and palaeoecology of the Early Cambrian Chengjiang biota from Eastern Yunnan, China: Berliner Paläobiologische Abhandlungen, band, v. 7, 197 p.
Huang, D., Wang, Y., Gao, J., and Wang, Y., 2012, A new anomalocaridid frontal appendage from the Middle Cambrian Mantou Formation of the Tangshan Area: Acta Palaeontologica Sinica, v. 51, p. 411415 [in Chinese with English abstract].
Kühl, G., Briggs, D.E.G., and Rust, J., 2009, A great-appendage arthropod with a radial mouth from the Lower Devonian Hunsruck Slate, Germany: Science, v. 323, p. 771.
Lankester, E.R., 1904, The structure and classification of Arthropoda: Quarterly Journal of Microscopical Science, v. 47, p. 523582.
Legg, D.A., Sutton, M.D., and Edgecombe, G.D., 2013, Arthropod fossil data increase congruence of morphological and molecular phylogenies: Nature Communications, v. 4, n. 2485 doi: 10.1038/ncomms3485.
Lerosey-Aubril, R., Hegna, T.A., Babcock, L.E., Bonino, E., and Kier, C., 2014, Arthropod appendages from the Weeks Formation Konservat-Lagerstätte: new occurrences of anomalocaridids in the Cambrian of Utah, USA: Bulletin of Geoscience, v. 89, p. 269282.
Liu, Q., 2013, The first discovery of anomalocaridid appendages from the Balang Formation (Cambrian Series 2) in Hunan, China: Alcheringa, v. 37, p. 338343.
Lu, Y., 1941, Lower Cambrian stratigraphy and trilobite faunas of Kunming, Yunnan: Bulletin of the Geological Society of China, v. 21, p. 7190.
Luo, H., Jiang, Z., Wu, X., Song, X., Lin., O., Xing, Y., Liu, G., Zhang, S., and Tao, Y., 1984, Sinian-Cambrian Boundary Stratotype Section at Meishucun, Jinning, Yunnan, China, Kunming, People’s Publishing House of Yunnan, 154 p. [In Chinese with English summary].
Luo, H., Jiang, Z., and Tang, L., 1994, Stratotype Section for Lower Cambrian Stages in China, Kunming, Yunnan Science and Technology Press, 183 p. [In Chinese with English summary].
National Commission on Stratigraphy of China (NCSC), ed., 2012, Stratigraphic Chart of China (English version), Beijing, Geological Publishing House.
National Commission on Stratigraphy of China (NCSC), ed., 2014, Stratigraphic Chart of China, Beijing, Geological publishing House [In Chinese].
Nedin, C., 1995, The Emu Bay Shale, a Lower Cambrian fossil Lagerstätten, Kangaroo Island, South Australia: Memoirs of the Association of Australian Palaeontologists, v. 18, p. 3140.
Ortega-Hernández, J., 2015, Homology of head sclerites in Burges Shale euarthropods: Current Biology, v. 25, p. 16251633.
Paterson, J.R., García-Bellido, D.C, Lee, M.S.Y., Brock, G.A., Jago, J.D., and Edgecombe, G.D., 2011, Acute vision in the giant Cambrian predator Anomalocaris and the origin of compound eyes: Nature, v. 480, p. 237240.
Smith, M.R., and Ortega-Hernández, J., 2014, Hallucigenia’s onychophoran-like claws and the case for Tactopoda: Nature, v. 514, p. 363366.
Van Roy, P., and Briggs, D.E.G., 2011, A giant Ordovician anomalocaridid: Nature, v. 473, p. 510513.
Van Roy, P., Daley, A.C., and Briggs, D.E.G., 2015, Anomalocaridid trunk limb homology revealed by a giant filter feeder with paired flaps: Nature, v. 522, p. 7780.
Vinther, J., Stein, M., Longrich, N.R., and Harper, D.A.T., 2014, A suspension-feeding anomalocarid from the Early Cambrian: Nature, v. 507, p. 496499.
Walcott, C.D., 1911, Middle Cambrian Holothurians and Medusae: Smithsonian Miscellaneous Collections, v. 57, p. 4168.
Walcott, C.D., 1912, Middle Cambrian Branchiopoda, Malacostraca, Trilobita and Merostomata: Smithsonian Miscellaneous Collections, v. 57, p. 145228.
Wang, Y., Huang, D., and Hu, S., 2013, New anomalocaridid frontal appendages from the Guanshan biota, eastern Yunnan: Chinese Science Bulletin, v. 58, p. 39373942.
Wang, Z., Huang, Z., Yao, J., and Ma, X., 2014, Characteristics and main progress of the Stratigraphic Chart of China and Directions: Acta Geoscientica Sinica, v. 35, p. 271276 [In Chinese with English abstract].
Whiteaves, J.F., 1892, Description of a new genus and species of phyllocarid Crustacea from the Middle Cambrian of Mount Stephen, B.C.: Canadian Record of Science, v. 5, p. 205208.
Whittington, H.B., and Briggs, D.E.G., 1985, The largest Cambrian animal, Anomalocaris, Burgess Shale, British Columbia: Philosophical Transactions of the Royal Society of London, Series B, v. 309, p. 569609.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Altmetric attention score