Structure of prostomial photoreceptor-like sense organs in Protodriloides species (Polychaeta, Protodrilida)

Autor(en): Purschke, G 
Muller, MC
Stichwörter: ANNELIDA; CENTRAL-NERVOUS-SYSTEM; FINE-STRUCTURE; Marine & Freshwater Biology; photoreceptor; phylogeny; Polychaeta; Protodriloides; SACCOCIRRIDAE; sense organs; STATOCYSTS; ULTRASTRUCTURE
Erscheinungsdatum: 1996
Volumen: 37
Ausgabe: 3
Startseite: 205
Seitenende: 219
Two different types of ciliary sensory structures have been found in the prostomium and palps of Protodriloides chaetifer and Protodriloides symbioticus. There are three serially arranged pairs in the prostomium close to the brain and up to six have been found along the length of the palps. The sensory structures in the palps and the anterior pair in the prostomium belong to the first type. It is a so-called basal ciliated cell not associated with a supporting cell. This sensory cell bears a bundle of a few cilia forming a loop around the cell body. Most likely they have a function other than photoreception. The type-2 sense organs are multicellular, comprise one to two sensory units each consisting of a multiciliated sensory cell and a glial supporting cell, and probably have a photoreceptive function. The cilia are unbranched, form a regularly coiled bundle, and the 9x2+0 axoneme is transformed distally into a 3x1 pattern. There is a degree of intra- and interspecific variation in number of organs and cytological features. Comparison with the sense organs in other invertebrates with special emphasis on polychaetes and the remaining genera of the Protodrilida reveals that neither type has yet been observed in other polychaetes. This finding clearly corroborates the supposed phylogenetic relationship of Protodriloides within the Protodrilida.
ISSN: 00079723

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