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You are here: Home / Associated publications / Belgian Journal of Zoology / Bibliographic References / Degenerating epidermal cells in Xenoturbella bocki (phylum uncertain), Nemertodermatida and Acoela (Platyhelminthes)

K Lundin (2001)

Degenerating epidermal cells in Xenoturbella bocki (phylum uncertain), Nemertodermatida and Acoela (Platyhelminthes)


Species of the Nemertodermatida. and Acoela have a mode of withdrawing and resorbing worn ciliated epidermal cells, through the epidermis and into the gastrodermal tissue. The ultrastructure of these degenerating epidermal cells has been described from very few species, especially concerning the Nemertodermatida. New data are presented here from Nemertoderma bathycola. Studies of the body wall of the enigmatic Xenoturbella bocki revealed darkened, shrunken cells with epidermal-type cilia enclosed in a vacuole. These cells were found in basal parts of the epidermis and within gastrodermal cells. The cells, or remains of them, were more dissolved in structure the further into the body they were observed. The process of resorbing ciliated epidermal cells in X bocki is essentially similar to that found in the Acoela and Nemertodermatida, thus supporting the hypothesis of a close relationship.

ultrastructure; Metazoan phylogeny; Xenoturbella; Platyhelminthes; Acoela; Nemertodermatida; epidermis
9th International Symposium on the Biology of the Turbellaria (ISBT), BARCELONA, SPAIN, JUN, 2000
  • ISSN: 0777-6276

ISSN 2295-0451 (online version)
ISSN 0777-6279 (printed version)
impact factor 2015: 0,87.

Prof. Dr. Isa Schön
Royal Belgian Institute of Natural Sciences
Vautierstraat 29
1000 Brussels, Belgium


Annales de la Société malacologique de Belgique
​Annales de la Société royale malacologique et zoologique de Belgique
Annales de la Société Royale Zoologique de Belgique
Belgian Journal of Zoology