Larval development of Myzostoma cirriferum (Myzostomida)

DC FieldValueLanguage
dc.contributor.authorEeckhaut, I
dc.contributor.authorFievez, L
dc.contributor.authorMuller, MCM
dc.date.accessioned2021-12-23T16:11:17Z-
dc.date.available2021-12-23T16:11:17Z-
dc.date.issued2003
dc.identifier.issn03622525
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/9621-
dc.description.abstractThe larval development of Myzostoma cirriferum is described by means of SEM, TEM, and cLSM. It is similar to that of other myzostomids and includes three stages: the protrochophore, the trochophore, and the metatrochophore. The protrochophore is a ball-shaped larva present in culture from 18-48 h after egg laying. It has no internal organs and its body is made of three cell types: covering cells and ciliated cells that are external and surrounded by a cuticle, and resting cells that fill the blastocoel. The trochophore is a pear-shaped larva that develops 20-72 h after egg laying; the body includes the same three cell types as the previous stage. The metatrochophore is a pear-shaped larva that develops between 40 h and 14 days and is characterized by the presence of two bundles of four chaetae. When fully developed, the metatrochophore has a digestive system (made of a pharynx, an esophagus, and a blind digestive pouch), two pairs of protonephridia, and a nervous system composed of a supraesophageal ganglion, circumesophageal connectives, and dorsal and ventral nerves. Metamorphosis generally occurs 7 days after egg laying. At that time, the metatrochophore loses its chaetae and becomes pleated ventrally. This ultrastructural analysis suggests that chaetae and the five ventral longitudinal nerve cords of M. cirriferum metatrochophores are homologous structures to those observed in some polychaete trochophores. Coupled with recent phylogenetic analyses, where the Myzostomida are placed outside the Annelida, homologies between myzostomid and polychaete larvae support the view that a trochophore appeared early during the spiralian evolution. J. Morphol. 258:269-283, 2003. (C) 2003 Wiley-Liss, Inc.
dc.language.isoen
dc.publisherWILEY
dc.relation.ispartofJOURNAL OF MORPHOLOGY
dc.subjectAnatomy & Morphology
dc.subjectANNELIDA
dc.subjectIMMUNOHISTOCHEMISTRY
dc.subjectNERVOUS-SYSTEM
dc.subjectORGANIZATION
dc.subjectPHYLOGENY
dc.subjectPOLYCHAETA
dc.subjectULTRASTRUCTURE
dc.titleLarval development of Myzostoma cirriferum (Myzostomida)
dc.typejournal article
dc.identifier.doi10.1002/jmor.10160
dc.identifier.isiISI:000186688400001
dc.description.volume258
dc.description.issue3
dc.description.startpage269
dc.description.endpage283
dc.identifier.eissn10974687
dc.publisher.place111 RIVER ST, HOBOKEN 07030-5774, NJ USA
dcterms.isPartOf.abbreviationJ. Morphol.
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