Rhabdotubus
RegnumAnimalia
PhylumHemichordata
ClassisPterobranchia
GenusRhabdotubus
Subdivision ranksSpecies
Subdivision
  • R. robustus
  • R. johanssoni (type)

The Lower-Middle Cambrian animal Rhabdotubus is the earliest known pterobranch.[1] It bears strong similarity to the graptolites - indeed for some time it was misclassified as a dendroid graptolite.[2][3][4]

References

  1. ^ Bengtson, S. & Urbanek, A. (1986), "Rhabdotubus, a Middle Cambrian rhabdopleurid hemichordate", Lethaia. 19 (4): 293–308, Bibcode:1986Letha..19..293B. doi:10.1111/j.1502-3931.1986.tb00743.x, archived from the original on 2012-12-16, retrieved 2009-06-06
  2. ^ Maletz, J.; Steiner, M.; Fatka, O. (2005), "Middle Cambrian pterobranchs and the Question: What is a graptolite?", Lethaia. 38 (1): 73–85, Bibcode:2005Letha..38...73M. doi:10.1080/00241160510013204, retrieved 2009-06-06
  3. ^ Durman, P.N. & Sennikov, N.V. (1993), "A new rhabdopleurid hemichordate from the Middle Cambrian of Siberia", Palaeontology. 36: 283, archived from the original on July 16, 2011, retrieved 2009-06-06
  4. ^ Urbanek, A. (1994), "When is a pterobranch a graptolite?", Lethaia. 27 (4): 324, Bibcode:1994Letha..27..324U. doi:10.1111/j.1502-3931.1994.tb01582.x