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Comparative morphology of the feeding apparatus in the Terebellida (Annelida: Polychaeta)
Zhadan, A.E.; Tzetlin, A.B. (2002). Comparative morphology of the feeding apparatus in the Terebellida (Annelida: Polychaeta). Cah. Biol. Mar. 43(2): 149-164
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
Peer reviewed article  

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Keywords
    Animal morphology; Evolution; Ultrastructure; Terebellidae Johnston, 1846 [WoRMS]; Marine

Authors  Top 
  • Zhadan, A.E.
  • Tzetlin, A.B.

Abstract
    The morphology of buccal parts was studied in twenty representative species of Terebellida belonging to the families Terebellidae, Ampharetidae, Trichobranchidae and Pectinariidae. The ultrastructure of the ventral pharyngeal organ was studied in Ampharete lindstroemii and juveniles of Nicolea zostericola and Pectinaria hyperborea. The ventral pharyngeal organ consists of investing muscle fibres and a bulbous rnuscle including muscle and interstitial cells. A glandular ridge is found in the posterior part of the bulbous muscle. No such structures were observed in Pectinaria hyperborea. The upper lip in representatives of Terebellidae, Trichobranchidae, Ampharetidae, and Alvinellidae is similar in structure. It consists of an area of tentacle attachment and a free edge. In contrast, the upper lip in Pectinariidae has no free edge. A hypothesis on the evolution of the buccal apparatus in the Terebellida is proposed. A distinct prostomium and tentacles located on the upper lip outside the mouth (as in Ampharetidae with everted tentacles) are considered to be a plesiomorphic pattern. The ciliated surface of the dorsal part of the buccal cavity in the Terebellida is considered to be homologous to the dorso-lateral folds found in most polychaete taxa.

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