Parapodial glandular organs in Owenia borealis (Annelida: Oweniidae) and their possible relationship with nephridia. Issue 2 (30th January 2020)

• Record Type: Journal Article
• Authors: Rimskaya‐Korsakova, Nadezda; Dyachuk, Vyacheslav; Temereva, Elena
• Is Part Of: Journal of experimental zoology. Volume 334:Issue 2(2020)
• Page Start: 88
• Page End: 99
• Publication Date: 2020-01-30
• Subjects: goblet cells -- nail‐shaped microvilli -- Oweniidae -- tube -- tube‐dwelling annelids; Developmental biology -- Periodicals; Evolution (Biology) -- Periodicals; Molecular evolution -- Periodicals; Zoology -- Periodicals; Evolution, Molecular -- Periodicals; Developmental Biology -- Periodicals; Zoology -- Periodicals; 591
• DOI: 10.1002/jez.b.22928
• Languages: English
• ISSNs: 1552-5007

Abstract

Abstract: Oweniidae is a basal group of recent annelids and nowadays it attracts the attention of researchers of many biological fields. Surprisingly, details of their anatomy, like the adult excretory system, remain obscure. Researchers recently suggested that the paired organs of tubeworms in the family Oweniidae are related to nephridia. In the current study of Owenia borealis adults, we determined that these structures are parapodial glandular organs (PGOs) and are located in the first two segments of adults. The PGOs are complex subepidermal multicellular glands that contain secretory cells, that is, goblet cells, which are differentiated by the type of the producing tube matter. The goblet cells are surrounded by muscles that are used to extrude material stored in the PGO's lumen into the external environment. The anterior pair of PGOs have very well‐developed rough endoplasmatic reticulum in the proximal cells, spacious Golgi complexes, numerous nail‐shaped microvilli, and apocrine secretory processes in the goblet cells of the distal parts. The posterior pair of PGOs only consists of cells, which probably produce proteinaceous fibrils. We discuss the homology of goblet cells with specific nail‐shaped microvilli that produce β‐chitin within annelids. We also discuss the possibility that PGOs and nephridia have a common origin. This study provides new information on the ultrastructure of cells that secrete the organic material used to form the tubes inhabited by tube‐dwelling annelids. Abstract : Do parapodial glandular organs of Owenia borealis originate from metanephridia? Research Highlights: On the basis of their morphology and ultrastructure, the parapodial glandular organs of Owenia borealis appear to be evolutionarily related to nephridia and are specialized for the secretion of material used to produce tubes.