Two new species of Owenia (Annelida: Polychaeta) in the northern part of the North Atlantic Ocean and remarks on previously erected species from the same area

Koh, Byoung–Seol; Bhaud, Michel; Jirkov, I. A.

doi:10.1080/00364820308472

Cited by 12 publications

(37 citation statements)

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“…Different numbers of glands could reflect the amount of the tube material required, which depends on the diameter and length of the bodies of different species: O. borealis is narrower and shorter than O. collaris (see fig. 5 in Koh et al, 2003; Hiebert, 2014).…”

Section: Discussionmentioning

confidence: 96%

“…About 30 adults of O. borealis Koh et al (2003) were collected in September 2018 near the Espegrend Marine Biological Station, University of Bergen, Norway. Live adults were extracted from their tubes and examined with an Olympus CX22 (Olympus America Inc., Tokyo, Japan) light microscope equipped with a Panasonic DMC‐TZ10 digital camera.…”

Section: Methodsmentioning

confidence: 99%

“…The objective of the current study was to describe the anatomy and ultrastructure of the PGOs in the first and second body segments of Owenia borealis (Koh, Bhaud, & Jirkov 2003). Although the latter authors suggested that these PGOs might be excretory organs and although these organs have been previously referred to as nephridia, the fact whether their anatomy and ultrastructure resemble those of nephridia is unknown.…”

Section: Introductionmentioning

confidence: 99%

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Parapodial glandular organs in Owenia borealis (Annelida: Oweniidae) and their possible relationship with nephridia

2020

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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.

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Section: Discussionmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Parapodial glandular organs in Owenia borealis (Annelida: Oweniidae) and their possible relationship with nephridia

2020

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“…This has been clear for some time from critical morphological studies (e.g. Williams, 1984;Mackie and Pleijel, 1995;Koh et al, 2003). Furthermore, recent studies have shown that even in more restricted areas, several morphologically similar but genetically different forms have been demonstrated among common species (e.g.…”

Section: Introductionmentioning

confidence: 95%

Original specimens and type localities of early described polychaete species (Annelida) from Norway, with particular attention to species described by O.F. Müller and M. Sars

Oug¹,

Bakken²,

Kongsrud³

2014

Mem. Mus. Vic.

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Oug, E., Bakken, T. and Kongsrud, J.A. 2014. Original specimens and type localities of early described polychaete species (Annelida) from Norway, with particular attention to species described by O.F. Müller and M. Sars. Memoirs of Museum Victoria 71: 217-236.Early descriptions of species from Norwegian waters are reviewed, with a focus on the basic requirements for reassessing their characteristics, in particular, by clarifying the status of the original material and locating sampling sites. A large number of polychaete species from the North Atlantic were described in the early period of zoological studies in the 18th and 19th centuries. The descriptions were often short or referred solely to general characteristics, which by today's standards are considered inadequate for species discrimination. As a result, a number of taxa among the so-called 'wellknown and widely distributed' species have later been confused with morphologically similar species. Close to 100 presently valid species were described from Norwegian waters before 1900. The most prolific contributions were made by O.F. Müller (with about 20 species from 1771-1776) and Michael Sars (with more than 50 species from 1829-1872). Other authors in the 19th century included Anders Ørsted, Heinrich Rathke and Gerhard Armauer Hansen. Descriptions were mostly in Latin (O.F. Müller) or in Norwegian or Danish with the diagnosis in Latin (M. Sars and contemporary naturalists). Original material from O.F. Müller is not known to exist. Original material from M. Sars and contemporary scientists does still exist, but is often not identified as original ('syntypes') and is occasionally spread over several museum collections. Locating original sampling localities ('type localities') has been achieved by combining information from various literature sources, labels of original material (when extant), and knowledge of historic place names.

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“…Even in the Barents Sea, the most thoroughly studied area, new species are still being found (e.g., Chambers & Woodham 2003, Koh et al 2003, Ramos et al 2010. Polychaetes of the family Serpulidae are obligate sedentary suspension-feeders that secrete calcareous tubes and use the anterior crown of branchial radioles for both feeding and respiration.…”

Section: Introductionmentioning

confidence: 99%

Two new species of serpulid polychaetes (Annelida) from the Barents Sea

Rzhavsky¹,

Kupriyanova²,

Sikorski³

2013

Fauna Norv.

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Rzhavsky AV, Kupriyanova EK and Sikorski AV. 2013. Two new species of serpulid polychaetes (Annelida) from the Barents Sea. Fauna norvegica 32: 27-38.Although Scandinavian Arctic polychaete fauna has been extensively investigated, new species are still being found in the Barents Sea. Polychaetes of the family Serpulidae are calcareous tubeworms that are most abundant at low latitudes and less common in Arctic and Antarctic waters. Because recent phylogenetic data indicate that the family Spirorbidae is a clade nested inside Serpulidae, spirorbins are treated here as subfamily Spirorbinae and their traditionally recognized subfamilies are thus lowered to the tribes Paralaeospirini, Spirorbini, Circeini, Romanchellini, Pileolariini and Januini. Here we report two new serpulid species, a filogranin Protis akvaplani sp. n. and a spirorbin Bushiella (Bushiella) barentsii sp. n. collected from off the northern Norwegian coast. Protis akvaplani differs from other species of within the genus by its tube with a high longitudinal keel, six thoracic chaetigerous segments, and short thoracic membranes ending after the 3rd segment. Generic diagnosis of the genus Protis has been emended. Bushiella (B.) barentsii differs from other species of the subgenus Bushiella by morphology of the opercular talon of operculum, incomplete fusing of primary operculum with brood chamber, and large tubes (up to 5 mm in coil diameter) with 1-2 distinct longitudinal ridges.

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Two new species of Owenia (Annelida: Polychaeta) in the northern part of the North Atlantic Ocean and remarks on previously erected species from the same area

Cited by 12 publications

References 0 publications

Parapodial glandular organs in Owenia borealis (Annelida: Oweniidae) and their possible relationship with nephridia

Parapodial glandular organs in Owenia borealis (Annelida: Oweniidae) and their possible relationship with nephridia

Original specimens and type localities of early described polychaete species (Annelida) from Norway, with particular attention to species described by O.F. Müller and M. Sars

Two new species of serpulid polychaetes (Annelida) from the Barents Sea

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