Anterior sense organs in Sabellaria alveolata (Annelida, Sedentaria, Spionida) with special reference to ultrastructure of photoreceptor elements presumably involved in shadow reflex

DC FieldValueLanguage
dc.contributor.authorMeyer, Christian
dc.contributor.authorFaroni-Perez, Larisse
dc.contributor.authorPurschke, Guenter
dc.date.accessioned2021-12-23T16:16:24Z-
dc.date.available2021-12-23T16:16:24Z-
dc.date.issued2019
dc.identifier.issn0720213X
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/11854-
dc.description.abstractThe reef-building sedentary polychaete, Sabellaria alveolata, is well known for its specialized anterior end, the operculum, which is exposed to the environment during vital activities, such as feeding or as it seals its tube when the animal withdraws. This region represents the most important sensory structure in Sabellariidae. It comprises two lobes, tentacular filaments, protective chaetae (paleae), a median organ, and a median ridge, and bears various pigmented spots. Worms swiftly withdraw into tubes triggered by abrupt light change (shadow reflex). We suspected that the pigmented spots were photoreceptive and responsible for the shadow response. To test this hypothesis, the median organ and median ridge of S. alveolata were investigated by applying light microscopy, confocal laser scanning microscopy, scanning, and transmission electron microscopy. Besides unciliated supportive cells, these organs consist of numerous multiciliated and glandular cells on their ventral surfaces. The multiciliated cells are of two types: epidermal supportive and receptor cells. The median organ is innervated directly from the brain by two longitudinal basiepithelial nerves. The presence of multiciliated cells and mucocytes suggests that the organ is sensory, involved in both feeding and tube-building behavior. Furthermore, we found two pairs of eyespots on the lateral posterior part of the median ridge, situated close to the neurite bundles anterior to the brain. These eyes are simple in structure and resemble larval-type eyes. They are composed of only two cells each, one rhabdomeric photoreceptor cell and one pigmented supportive cell. The pigmented eyes on the median ridge are clearly involved in photoreception and very likely involved in shadow reflex.
dc.description.sponsorshipNational Council for Scientific and Technological Development, BrazilConselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) [CNPq - SWE 201233/2015-0]; Museum National d'Histoire Naturelle; We are grateful to the head of our department, Professor Dr. A. Paululat, Osnabruck, for various kinds of support. Professor Dr. T. Bartolomaeus and Dr. E. Tilic, Bonn, Germany, kindly helped fixing specimens from Mont St. Michel. Thanks are also due to K. Etzold and W. Mangerich, Osnabruck, for various kinds of technical assistance, particularly for introducing CM to electron microscopy techniques. Funding was provided by National Council for Scientific and Technological Development, Brazil (CNPq - SWE 201233/2015-0) and Museum National d'Histoire Naturelle.
dc.language.isoen
dc.publisherSPRINGER
dc.relation.ispartofZOOMORPHOLOGY
dc.subjectAnatomy & Morphology
dc.subjectEVOLUTION
dc.subjectEYES
dc.subjectFAN WORMS
dc.subjectFINE-STRUCTURE
dc.subjectLARVAL DEVELOPMENT
dc.subjectMedian organ (dorsal hump)
dc.subjectMedian ridge
dc.subjectMETAMORPHOSIS
dc.subjectOperculum
dc.subjectPhotoreceptor cells
dc.subjectPHRAGMATOPOMA-CALIFORNICA
dc.subjectPOLYCHAETA-SABELLARIIDAE
dc.subjectPolychaetes
dc.subjectREEF
dc.subjectSensory cells
dc.subjectSETTLEMENT
dc.subjectZoology
dc.titleAnterior sense organs in Sabellaria alveolata (Annelida, Sedentaria, Spionida) with special reference to ultrastructure of photoreceptor elements presumably involved in shadow reflex
dc.typejournal article
dc.identifier.doi10.1007/s00435-018-0422-y
dc.identifier.isiISI:000459514600004
dc.description.volume138
dc.description.issue1
dc.description.startpage39
dc.description.endpage54
dc.contributor.orcid0000-0002-2572-3390
dc.contributor.orcid0000-0001-8303-5636
dc.contributor.researcheridAAU-9660-2021
dc.contributor.researcheridI-4870-2013
dc.identifier.eissn1432234X
dc.publisher.place233 SPRING ST, NEW YORK, NY 10013 USA
dcterms.isPartOf.abbreviationZoomorphology
crisitem.author.deptFB 05 - Biologie/Chemie-
crisitem.author.deptidfb05-
crisitem.author.orcid0000-0002-2572-3390-
crisitem.author.parentorgUniversität Osnabrück-
crisitem.author.netidPuGu978-
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