Specific features of the head region in euconodont animals

G.I. Guravskaya & A.P. Kassatkina

Abstract. New data on morphology of the head region of euconodonts are discussed based on a study of its imprint from the Lower Carboniferous deposits of the Polar Urals (Russia); on its external ventral surface, the animal had an oval expansion of the head region, supposedly, a mouth food sac. A similar structure is also described in one of the imprints from Granton (Great Britain) exposed from internal surfaces. A hypothesis is put forward on the mechanism of functioning of the feeding apparatus in euconodonts which consists of hard S, M, and P tooth elements and H attaching skeletal elements as well as soft connective structures. The food sac probably served for filtering food particles from the water which was removed through special openings and for formation of the food bolus and transferring the latter into the alimentary canal (gut). These data gave to reasons for a new interpretation of feeding behaviour of euconodonts. It is suggested that the euconodont animals were filter feeders adapted to the near-bottom dwelling over substrates, where there was greatest concentration of small food items available for filtration.
Key words: euconodonts, imprints, morphology, feeding, filtration, Euconodonta, Lower Carboniferous

Zoosystematica Rossica, 2015, 24(1): 122–127  ▪  Published in print 25 June 2015


Open full article  

References

Aldridge R.J, Briggs D.E.G, Clarkson E.N.K. & Smith M.P. 1986. The affinities of conodonts – new evidence from the Carboniferous of Edinburgh, Scotland. Lethaia, 19(4): 279–291.

Aldridge R.J., Briggs D.E.G., Smith M.P., Clarkson E.N.K. & Clark N.D.L. 1993. The anatomy of conodonts. Philosophical Transactions of the part Royal Society B: Biological Sciences, 340: 405–421.https://doi.org/10.1098/rstb.1993.0082

Aldridge R.J. & Purnell M.A. 1996. The conodont controversies. Elsevier Trends Journals, 11(11): 463–468. https://doi.org/10.1016/0169-5347(96)10048-3

Briggs D.E.G., Clarkson E.N.K. & Aldridge R.J. 1983. The conodont animal. Lethaia, 16(1): 1–14. https://doi.org/10.1111/j.1502-3931.1983.tb01993.x

Buryi G.I. & Kassatkina A.P. 2003. Possible new skeletal elements of euconodonts. Courier ForschungsinstitutSenckenberg, 245: 357–360.

Buryi G.I. & Kassatkina A.P. 2004 Rounded phosphatic structures (H elements) of euconodonts and their function (Euconodontophylea). Zoosystematica Rossica, 12(2): 157–161.

Buryi G.I., Kassatkina A.P., Zhuravlev A.V. & Safronov P.P. 2010. First finding of euconodont animals (Euconodontophylea) im­prints on the territory of Russia. Zoosystematica Rossica, 19(1): 147–153.

Buryi G.I., Kassatkina A.P., Zhuravlev A.V. & Safronov P.P. 2011. Unique finding of imprints of euconodont animals from the Nether-Polars. Bulletin of the Far Eastern Branch of the RussianAcademy of Sciences, 3: 122–126. [In Russian].

Kassatkina A.P. & Stolyarova M.V. 2010. Morfologiya, sistematika, ekologiya shche­tinkochelyustnykh Yaponskogo moray i sopre­del’nykh akvatoriy [Morphology, taxonomy, ecology of Chaetognatha of the Japan Sea and adjacent water areas]. Vladivostok: Dalnauka. 260 p. [In Russian].

Morris S.C. 1989. Conodont palaeobiology: recent progress and unsolved problems. Terra Nova, 1: 135–150. https://doi.org/10.1111/j.1365-3121.1989.tb00345.x

Volume, Year:
Vol. 28. 2019
Vol. 27. 2018
Vol. 26. 2017
Vol. 25. 2016
Vol. 24. 2015
Vol. 23. 2014
Vol. 22. 2013
Vol. 21. 2012
Vol. 20. 2011
Vol. 19. 2010
Vol. 18. 2009
Vol. 17. 2008
Vol. 16. 2007
Vol. 15. 2006
Vol. 14. 2005
Vol. 13. 2004
Vol. 12. 2003
Vol. 11. 2002
Vol. 10. 2001
Vol. 9. 2000
Vol. 8. 1999
Vol. 7. 1998
Vol. 6. 1997
Vol. 5. 1996
Vol. 4. 1995
Vol. 3. 1994
Vol. 2. 1993
Vol. 1. 1992
Supplementa:
Suppl. 2. 2018