Dorsolateral folds in the polychaete foregut: structure, prevalence and phylogenetic significanceстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Ciliary folds form the dorsolateral walls of the foregut in numerous polychaetes. These feeding
structures have not been recognized earlier. They are described here for 26 species in 16 families.
The folds consist of ciliated cells, usually associated with gland cells, and have no intrinsic muscular
system. Protraction of the dorsolateral folds to make contact with the substratum during uptake of
food is mainly achieved by contractions of the musculature of the body wall in the anterior part of
the body. These folds either occur alone or are associated with a ventral pharyngeal organ. Dorsolateral
ciliated folds are structures originally adapted to microphagy. From the present study and the
literature it is obvious that these structures are widespread among polychaetes of various taxa. This
distribution and their similar structure suggest that dorsolateral folds are phylogenetically old structures
which might already have been present in the stem species of polychaetes.