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Jurassic Forum » JURASSIC references & paper reviews » Jurassic around the world » Radwanska U., Poirot E. (2010) (Copepod-infested Bathonian (Middle Jurassic) echinoids)
Radwanska U., Poirot E. (2010)
mhornДата: Thursday, 06.01.2011, 20:04 | Сообщение # 1
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Radwanska U., Poirot E. (2010) Copepod-infested Bathonian (Middle Jurassic) echinoids from northern France // Acta geologica Polonica. Vol.60. no.4. P.549-555

http://www.geo.uw.edu.pl/agp/table/pdf/60-4/radwanska.pdf

New examples of Bathonian (Middle Jurassic) parasitic exocysts on acrosaleniid echinoid tests are recorded from northern France. These exocysts can be attributed to the life activity of copepod crustaceans and are considered to have been formed as a result of copepod larval settlement in these echinoids by way of the gonopores. Sexual dimorphism is recognised in copepod-infested Acrosalenia spinosa L. Agassiz, 1840, on the basis of size and position of gonopores, those in females being larger and wider apart, those in males smaller and situated subcentrally. The previous stratigraphic range of copepod cysts of this type (i.e., Middle Oxfordian to Middle Kimmeridgian) can now be extended down to the base of the Bathonian (convergens Subzone).


Middle Jurassic - Lower Cretaceous ammonites & aptychi
 
Jurassic Forum » JURASSIC references & paper reviews » Jurassic around the world » Radwanska U., Poirot E. (2010) (Copepod-infested Bathonian (Middle Jurassic) echinoids)
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