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+[[!meta title="Alimentary tract of kowalevskiidae (appendicularia, tunicata) and evolutionary implications"]]
+[[!tag Oikopleura]]
+
+Carlo Brena, Francesca Cima, Paolo Burighel
+
+Volume 258, Issue 2, November 2003, Pages 225-238, doi:10.1002/jmor.10145
+
+Alimentary tract of kowalevskiidae (appendicularia, tunicata) and evolutionary implications
+
+[[!doi 10.1002/jmor.10145 desc="No heart was found."]]
secreting the Reissner's fiber (reviewed in [[Olsson, 1993|biblio/10.1007_978-3-642-78013-4_5]]).
Electron microscopy shows a large perikaryon, cisternas and a cilium which is inserted
in the central canal ([[Holmberg and Olsson, 1984|biblio/reissner_oik]]).
-
+ - In contrary to Kowalevskiidae, ([[Brena, Cima and Burighel, 2003|biblio/10.1002_jmor.10145]]),
+ _Oikopleura_ do have a heart.
Physiology
----------