Biology:Hurdiidae

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Hurdiidae (synonymous with the previously named Peytoiidae[1]) is an extinct cosmopolitan family of radiodonts, a group of stem-group marine arthropods, which lived during the Paleozoic Era. It is the most long-lived radiodont clade, lasting from the Cambrian period to the Devonian period.

Description

  • Anatomy of the frontal appendage of a hurdiid
    Anatomy of the frontal appendage of a hurdiid
  • Frontal appendages of various species of hurdiid
    Frontal appendages of various species of hurdiid
  • Dorsal carapaces of various species of hurdiid
    Dorsal carapaces of various species of hurdiid

Hurdiidae is characterized by frontal appendages with distal region composed of 5 subequal blade-like endites, alongside the enlarged head carapaces and tetraradial mouthpart (oral cone).[2]

The frontal appendages of hurdiids have a distinctive morphology, with the appendage of most species bearing five equally-sized elongate blade-like ventral spines known as endites.[3] Subsequent podomeres were reduced in size and with only small endites or none. Each podomere bore only a single endite, unlike other radiodonts, in which the endites were paired.[3] In most species, the endites were curved medially, so that the appendages formed a basket-like structure.[2] Some hurdiids had greater numbers of endites, with Cordaticaris bearing seven endites of equal length.[4]

Hurdiids exhibited a wide range of body size. The smallest known hurdiid specimen, of an unnamed species, is estimated to have had a body length of 6–15 millimetres (0.24–0.59 in), but it is not known whether this specimen was a juvenile or an adult.[5] Aegirocassis, the largest known hurdiid, was over 2 metres (6.6 ft) long, comparable in size to the largest known arthropods.[6]

Paleobiology

The majority of hurdiids appear to have been predators that fed by sifting sediment with their frontal appendages, but some members, like Aegirocassis, Pseudoangustidontus, and possibly Cambroraster, were suspension feeders.[2][7][8]

Distribution

Hurdiids had a global distribution.[4] The earliest known hurdiid in the fossil record is Peytoia infercambriensis, which lived during the third age of the Cambrian in what is now the country of Poland.[9] The group increased in diversity during the Miaolingian epoch.[4] Post-Cambrian records of the group are rare, but the group lasted into the Devonian period, with the last known taxon being the Emsian Schinderhannes bartelsi from what is now Germany.[9][5]

Classification

Hurdiidae is classified within Radiodonta, a clade of stem-group arthropods. Hurdiidae is defined phylogenetically as the most inclusive clade containing Hurdia victoria but not Amplectobelua symbrachiata, Anomalocaris canadensis, or Tamisiocaris borealis.[10] Some authors have argued that Peytoiidae, which was named by Conway Morris and Robison, 1982, has priority over Hurdiidae, and that Hurdiidae has "yet to be properly established following ICZN standards", due to its first definition not having a character-based diagnosis, and the second being published in an online-only journal without being registered in the ZooBank database.[1][11]

Cladogram of Hurdiidae after Moysiuk & Caron, 2025:[12]

Hurdiidae
 

Mosura fentoni 80px

 
 
 

Schinderhannes bartelsi 70px

 
 
 
 

Stanleycaris hirpex 80px

 
 

Peytoia nathorsti 80px

 
 
 
 

Aegirocassis benmoulai 100px

 
Hurdiinae
 
 

Hurdia victoria 80px

 
 

Hurdia triangulata 80px

 
 
 
 

Pahvantia hastata 70px

 
 
 

Cordaticaris striatus 70px

 
 
 

Titanokorys gainesi 70px

 
 

Cambroraster falcatus 80px

 
 
 
 
 
 
 
 
 

Species include:

Tauricornicaris was previously considered as a member of Hurdiidae, but fossils of it were later reinterpreted to be euarthropod tergites.[17][18]

Zhenghecaris was originally described as a thylacocephalan, but it was later considered a hurdiid dorsal carapace.[19][2] However, its placement is questioned by some researchers, since its classification as a radiodont is largely based on the characters of Tauricornicaris.[16]

While Schinderhannes was originally described as a stem-arthropod with characters of both euarthropods and radiodonts, this interpretation was denied and most researchers now agree that it is a hurdiid radiodont.[20][21][22][23][2][24][25][26][27] A few researchers have raised questions about its classification as a hurdiid.[28][29]

Huangshandongia yichangensis, Liantuoia inflata[30] and Proboscicaris hospes[31] may represent species of Hurdia.[32][33]

References

  1. ↑ 1.0 1.1 McCall, Christian R.A. (2023-12-13). "A large pelagic lobopodian from the Cambrian Pioche Shale of Nevada" (in en). Journal of Paleontology 97 (5): 1009–1024. doi:10.1017/jpa.2023.63. ISSN 0022-3360. Bibcode: 2023JPal...97.1009M. https://www.cambridge.org/core/product/identifier/S002233602300063X/type/journal_article. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Moysiuk, J.; Caron, J.-B. (2019-08-14). "A new hurdiid radiodont from the Burgess Shale evinces the exploitation of Cambrian infaunal food sources" (in en). Proceedings of the Royal Society B: Biological Sciences 286 (1908). doi:10.1098/rspb.2019.1079. ISSN 0962-8452. PMID 31362637. 
  3. ↑ 3.0 3.1 3.2 3.3 Pates, Stephen; Daley, Allison C.; Butterfield, Nicholas J. (2019). "First report of paired ventral endites in a hurdiid radiodont". Zoological Letters 5 (1): 18. doi:10.1186/s40851-019-0132-4. ISSN 2056-306X. PMID 31210962. 
  4. ↑ 4.0 4.1 4.2 Sun, Zhixin; Zeng, Han; Zhao, Fangchen (2020). "A new middle Cambrian radiodont from North China: Implications for morphological disparity and spatial distribution of hurdiids". Palaeogeography, Palaeoclimatology, Palaeoecology 558. doi:10.1016/j.palaeo.2020.109947. ISSN 0031-0182. Bibcode: 2020PPP...55809947S. 
  5. ↑ 5.0 5.1 Pates, Stephen; Botting, Joseph P.; McCobb, Lucy M. E.; Muir, Lucy A. (2020). "A miniature Ordovician hurdiid from Wales demonstrates the adaptability of Radiodonta". Royal Society Open Science 7 (6). doi:10.1098/rsos.200459. PMID 32742697. Bibcode: 2020RSOS....700459P. 
  6. ↑ Van Roy, Peter; Daley, Allison C.; Briggs, Derek E. G. (2015). "Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps". Nature 522 (7554): 77–80. doi:10.1038/nature14256. PMID 25762145. Bibcode: 2015Natur.522...77V. 
  7. ↑ De Vivo, Giacinto; Lautenschlager, Stephan; Vinther, Jakob (2021-07-28). "Three-dimensional modelling, disparity and ecology of the first Cambrian apex predators" (in en). Proceedings of the Royal Society B: Biological Sciences 288 (1955). doi:10.1098/rspb.2021.1176. ISSN 0962-8452. PMID 34284622. 
  8. ↑ 8.0 8.1 Potin, G. J.-M.; Gueriau, P.; Daley, A. C. (2023). "Radiodont frontal appendages from the Fezouata Biota (Morocco) reveal high diversity and ecological adaptations to suspension-feeding during the Early Ordovician". Frontiers in Ecology and Evolution 11. doi:10.3389/fevo.2023.1214109. Bibcode: 2023FrEEv..1114109P. 
  9. ↑ 9.0 9.1 Daley, Allison C.; Legg, David A. (2015). "A morphological and taxonomic appraisal of the oldest anomalocaridid from the Lower Cambrian of Poland". Geological Magazine 152 (5): 949–955. doi:10.1017/S0016756815000412. Bibcode: 2015GeoM..152..949D. 
  10. ↑ Vinther, Jakob; Stein, Martin; Longrich, Nicholas R.; Harper, David A. T. (2014). "A suspension-feeding anomalocarid from the Early Cambrian". Nature 507 (7493): 496–499. doi:10.1038/nature13010. PMID 24670770. Bibcode: 2014Natur.507..496V. http://dro.dur.ac.uk/21270/1/21270.pdf. 
  11. ↑ Greenfield, Tyler (17 January 2023). ""Hurdiidae" versus Peytoiidae" (in en). https://incertaesedisblog.wordpress.com/2023/01/17/hurdiidae-versus-peytoiidae/. 
  12. ↑ 12.0 12.1 Moysiuk, Joseph; Caron, Jean-Bernard (May 2025). "Early evolvability in arthropod tagmosis exemplified by a new radiodont from the Burgess Shale". Royal Society Open Science 12 (5). doi:10.1098/rsos.242122. PMID 40370603. Bibcode: 2025RSOS...1242122M. 
  13. ↑ Gaëtan J.-M., Potin; Claisse, Pénélope (2 December 2025). "A new giant nektobenthic radiodont benthivore from the Early Ordovician Fezouata Biota in Morocco". Acta Palaeontologica Polonica 70 (4): 709–722. doi:10.4202/app.01278.2025. 
  14. ↑ 14.00 14.01 14.02 14.03 14.04 14.05 14.06 14.07 14.08 14.09 14.10 Caron, Jean-Bernard; Moysiuk, Joe (2021). "A giant nektobenthic radiodont from the Burgess Shale and the significance of hurdiid carapace diversity". R. Soc. Open Sci. 8. doi:10.1098/rsos.210664. PMID 34527273. Bibcode: 2021RSOS....810664C. 
  15. ↑ Wu, Yu; Pates, Stephen; Zhang, Mingjing; Lin, Weiliang; Ma, Jiaxin; Liu, Cong; Wu, Yuheng; Zhang, Xingliang et al. (2024). "Exceptionally preserved radiodont arthropods from the lower Cambrian (Stage 3) Qingjiang Lagerstätte of Hubei, South China and the biogeographic and diversification patterns of radiodonts" (in en). Papers in Palaeontology 10 (4). doi:10.1002/spp2.1583. ISSN 2056-2802. https://onlinelibrary.wiley.com/doi/abs/10.1002/spp2.1583. 
  16. ↑ 16.0 16.1 Pates S, Lerosey-Aubril R, Daley AC, Kier C, Bonino E, Ortega-Hernández J. 2021. The diverse radiodont fauna from the Marjum Formation of Utah, USA (Cambrian: Drumian) PeerJ 9:e10509 https://doi.org/10.7717/peerj.10509
  17. ↑ Guo, J.; Pates, S.; Cong, P.; Daley, A.; Edgecombe, G.; Chen, T.; Hou, X. (2018). "A new radiodont (stem Euarthropoda) frontal appendage with a mosaic of characters from the Cambrian (Series 2 Stage 3) Chengjiang biota" (in en). Papers in Palaeontology 5 (1): 99. doi:10.1002/spp2.1231. ISSN 2056-2799. Bibcode: 2019PPal....5...99G. https://ora.ox.ac.uk/objects/uuid:a2d090f6-c0cb-4603-8d89-a4894fe55f02. 
  18. ↑ Cong, Pei-Yun; Edgecombe, Gregory D.; Daley, Allison C.; Guo, Jin; Pates, Stephen; Hou, Xian-Guang (2018). Zhang, Xi-Guang. ed. "New radiodonts with gnathobase-like structures from the Cambrian Chengjiang biota and implications for the systematics of Radiodonta" (in en). Papers in Palaeontology 4 (4): 605–621. doi:10.1002/spp2.1219. ISSN 2056-2799. Bibcode: 2018PPal....4..605C. https://onlinelibrary.wiley.com/doi/10.1002/spp2.1219. 
  19. ↑ Pates, Stephen; Daley, Allison C.; Butterfield, Nicholas J. (2019-06-11). "First report of paired ventral endites in a hurdiid radiodont". Zoological Letters 5 (1): 18. doi:10.1186/s40851-019-0132-4. ISSN 2056-306X. PMID 31210962. 
  20. ↑ Vinther, Jakob; Stein, Martin; Longrich, Nicholas R.; Harper, David A. T. (2014). "A suspension-feeding anomalocarid from the Early Cambrian" (in en). Nature 507 (7493): 496–499. doi:10.1038/nature13010. ISSN 1476-4687. PMID 24670770. Bibcode: 2014Natur.507..496V. https://www.nature.com/articles/nature13010. 
  21. ↑ Cong, Peiyun; Ma, Xiaoya; Hou, Xianguang; Edgecombe, Gregory D.; Strausfeld, Nicholas J. (2014). "Brain structure resolves the segmental affinity of anomalocaridid appendages" (in en). Nature 513 (7519): 538–542. doi:10.1038/nature13486. ISSN 1476-4687. PMID 25043032. Bibcode: 2014Natur.513..538C. https://www.nature.com/articles/nature13486. 
  22. ↑ Van Roy, Peter; Daley, Allison C.; Briggs, Derek E. G. (2015). "Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps" (in en). Nature 522 (7554): 77–80. doi:10.1038/nature14256. ISSN 1476-4687. PMID 25762145. Bibcode: 2015Natur.522...77V. https://www.nature.com/articles/nature14256. 
  23. ↑ Lerosey-Aubril, Rudy; Pates, Stephen (2018-09-14). "New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton" (in en). Nature Communications 9 (1): 3774. doi:10.1038/s41467-018-06229-7. ISSN 2041-1723. PMID 30218075. Bibcode: 2018NatCo...9.3774L.  Dryad Data
  24. ↑ Liu, Jianni; Lerosey-Aubril, Rudy; Steiner, Michael; Dunlop, Jason A; Shu, Degan; Paterson, John R (2018-06-01). "Origin of raptorial feeding in juvenile euarthropods revealed by a Cambrian radiodontan". National Science Review 5 (6): 863–869. doi:10.1093/nsr/nwy057. ISSN 2095-5138. 
  25. ↑ Moysiuk, Joseph; Caron, Jean-Bernard (2021). "Exceptional multifunctionality in the feeding apparatus of a mid-Cambrian radiodont" (in en). Paleobiology 47 (4): 704–724. doi:10.1017/pab.2021.19. ISSN 0094-8373. Bibcode: 2021Pbio...47..704M. 
  26. ↑ Moysiuk, Joseph; Caron, Jean-Bernard (2022). "A three-eyed radiodont with fossilized neuroanatomy informs the origin of the arthropod head and segmentation". Current Biology 32 (15): 3302–3316.e2. doi:10.1016/j.cub.2022.06.027. ISSN 0960-9822. PMID 35809569. Bibcode: 2022CBio...32E3302M. 
  27. ↑ Zeng, Han; Zhao, Fangchen; Zhu, Maoyan (2023-01-06). "Innovatiocaris, a complete radiodont from the early Cambrian Chengjiang Lagerstätte and its implications for the phylogeny of Radiodonta" (in en). Journal of the Geological Society 180 (1). doi:10.1144/jgs2021-164. ISSN 0016-7649. Bibcode: 2023JGSoc.180..164Z. https://www.lyellcollection.org/doi/10.1144/jgs2021-164. 
  28. ↑ Zhu, X.; Lerosey-Aubril, R.; Ortega-Hernández, J. (2021). "Furongian (Jiangshanian) occurrences of radiodonts in Poland and South China and the fossil record of the Hurdiidae" (in en). PeerJ 9. doi:10.7717/peerj.11800. PMID 34386302. PMC 8312493. https://www.researchgate.net/publication/352983445. 
  29. ↑ Potin, Gaëtan J.-M.; Daley, Allison C. (2023). "The significance of Anomalocaris and other Radiodonta for understanding paleoecology and evolution during the Cambrian explosion". Frontiers in Earth Science 11. doi:10.3389/feart.2023.1160285. ISSN 2296-6463. Bibcode: 2023FrEaS..1160285P. 
  30. ↑ Zhilin, Cui; Shicheng, Huo (1990). "鄂西下寒武统甲壳类化石新发现". Acta Palaeontologica Sinica 29 (3). 
  31. ↑ Chlupač, Ivo; Kordule, Vratislav (2002). "Arthropods of Burgess Shale type from the Middle Cambrian of Bohemia (Czech Republic)". Bulletin of the Czech Geological Survey 77 (3): 167–182. http://www.geology.cz/bulletin/fulltext/3-02-chlupac. 
  32. ↑ Daley, Allison C.; Budd, Graham E.; Caron, Jean-Bernard (2013). "Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah" (in en). Journal of Systematic Palaeontology 11 (7): 743–787. doi:10.1080/14772019.2012.732723. ISSN 1477-2019. Bibcode: 2013JSPal..11..743D. http://www.tandfonline.com/doi/full/10.1080/14772019.2012.732723. 
  33. ↑ Sun, Zhixin; Zeng, Han; Zhao, Fangchen (2020). "A new middle Cambrian radiodont from North China: Implications for morphological disparity and spatial distribution of hurdiids". Palaeogeography, Palaeoclimatology, Palaeoecology 558. doi:10.1016/j.palaeo.2020.109947. ISSN 0031-0182. Bibcode: 2020PPP...55809947S. 

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