Polacanthoides

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Polacanthoides
Temporal range:
Early Cretaceous, ~140–135  Ma
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Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Clade:† Ornithischia
Clade:† Thyreophora
Clade:† Ankylosauria
Family:† Nodosauridae
Subfamily:† Polacanthinae
Genus:† Polacanthoides
Nopcsa, 1928
Type species
†Polacanthoides ponderosus
Nopcsa, 1928

Polacanthoides (meaning like Polacanthus ) is a dubious genus of nodosaurid dinosaur from the Wessex Formation of England. The type species is P. ponderosus. [1]

Contents

Discovery and naming

The holotype is NHMUK 2584 and it is a left scapula and left tibia discovered at the quarry near Bolney, West Sussex sometime between the 1820s and 1833; [2] the whereabouts of the holotype scapula could not be located by Blows (1987). [3] NHMUK 2584 was initially assigned to Hylaeosaurus by Mantell (1833), [4] and the new species Polacanthoides ponderosus was created for it by Nopsca (1928). [1]

Two more specimens were referred to P. ponderosus by Blows (1987): BMNH 2620a, a fragmentary right scapula, and BMNH 2615, a left tibia and scapula. [3] Mantell (1833) initially believed BMNH 2615 was a humerus, [4] while Lydekker (1888) assumed it was a left tibia. [5]

Classification

Polacanthoides is a member of the Polacanthinae and it has been suggested it was a chimera of skeletal elements belonging to Hylaeosaurus and Polacanthus . [6] It has also been suggested that Polacanthoides belonged to Stegosauria. [2]

See also

References

  1. 1 2 Nopcsa, F. (1928). Palaeontological notes on reptiles. Geologica Hungarica, Series Palaeontologica Volume 1 Part 1. Institutum Regni Hungariae Geologicum. pp. 1–84.
  2. 1 2 "Genus: Polacanthoides NOPCSA, 1928". Paleofile. Retrieved 5 March 2026.
  3. 1 2 Blows W.T. (1987). The armoured dinosaur Polacanthus foxi, from the Lower Cretaceous of the Isle of Wight, Palaeontology. 30, 557–580
  4. 1 2 Mantell, Gideon Algernon (1833). "Observations on the remains of the Iguanodon, and other fossil reptiles, of the strata of Tilgate Forest in Sussex". Proceedings of the Geological Society of London. 1: 410–411.
  5. ↑ Lydekker, Richard (1888). Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ... By Richard Lydekker ... London: Printed by order of the Trustees.
  6. ↑ Raven, T.J.; Barrett, P.M.; Pond, S.B.; Maidment, S.C. (2020). "Osteology and Taxonomy of British Wealden Supergroup (Berriasian–Aptian) Ankylosaurs (Ornithischia, Ankylosauria)". Journal of Vertebrate Paleontology. 40 (4) e1826956. Bibcode:2020JVPal..40E6956R. doi:10.1080/02724634.2020.1826956.


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