Description of a New Sedentary Polychaete, Thoracophelia ezoensis n. sp

Okuda, Shiro

doi:10.2183/pjab1912.12.201

Cited by 3 publications

(8 citation statements)

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“…The subtidal habitats for E. japonicus sp. nov. and E. flabelliferus are in contrast with the intertidal habitats mainly restricted within upper to midtidal zones for most Euzonus species (Okuda, 1934;McConnaughey and Fox, 1949;Dales, 1952;Probert, 1976;Kemp, 1988;Buzhinskaja, 1991;Jaramillo et al, 1993;Jaramillo, 1994;Hartmann-Schröder and Parker, 1995;Souza and Gianuca, 1995;our unpublished data).…”

Section: Systematicsmentioning

confidence: 73%

“…At present, 11 current species are known in this genus: E. arcticus Grube, 1866, E. furciferus (Ehlers, 1897, E. mucronatus (Treadwell, 1914), E. ezoensis (Okuda, 1936), E. dillonensis (Hartman, 1938), E. williamsi (Hartman, 1938), E. flabelliferus (Ziegelmeier, 1955), E. profundus Hartman, 1967, E. heterocirrus Rozbaczylo and Zamorano, 1970, E. otagoensis Probert, 1976, and E. zeidleri Hartmann-Schröder and Parker, 1995 Most Euzonus species inhabit intertidal sandy beaches consisting of well-sorted, medium to fine sands (Okuda, 1934;McConnaughey and Fox, 1949;Dales, 1952;Probert, 1976;Kemp, 1988;Buzhinskaja, 1991;Jaramillo et al , 1993;Jaramillo, 1994;Hartmann-Schröder and Parker, 1995;Souza and Gianuca, 1995). However, E. flabelliferus was collected from subtidal zones in the North Sea and the White Sea (Ziegelmeier, 1955;HartmannSchröder, 1996), and E. profundus was collected from an abyssal depth of 4008 m, southeast off the Cape Horn (Hartman, 1967).…”

Section: Introductionmentioning

confidence: 99%

“…In East Asia including the Far East Region of Russia (Annenkova, 1935;Uschakov, 1955), northern Japan (Okuda, 1934(Okuda, , 1936Imajima and Hartman, 1964), and the Chinese coast of the Yellow Sea (Dejian and Ruping, 1988), three intertidal species of the genus Euzonus , E. arcticus , E. ezoensis and E. dillonensis have been recorded, but no subtidal species has been recorded. Thoracophelia yasudai described by Okuda (1934) from Japanese coast of the Sea of Japan was regarded as a junior synonym of E. arcticus by Imajima and Hartman (1964).…”

Section: Introductionmentioning

confidence: 99%

“…Thoracophelia yasudai described by Okuda (1934) from Japanese coast of the Sea of Japan was regarded as a junior synonym of E. arcticus by Imajima and Hartman (1964).…”

Section: Introductionmentioning

confidence: 99%

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A New Species of Euzonus (Polychaeta: Opheliidae) from Subtidal Zones in Japan

Misaka

Sato

2003

Zoological Science

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A new opheliid polychaete, Euzonus japonicus sp. nov., is described. This species was collected from subtidal zones in Japanese coasts, while most Euzonus species inhabit intertidal sandy beaches. E. japonicus sp. nov. is morphologically most similar to another subtidal species, E. flabelliferus (Ziegelmeier, 1955) collected from northern Europe, but different from that in the form of branchiae. They share a unique characteristic on setiger 10, i. e., a pair of lateral transverse rows of conical cirri, instead of a pair of lateral smooth ridges that are common to all intertidal Euzonus species.

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Section: Systematicsmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Thoracophelia yasudai described by Okuda (1934) from Japanese coast of the Sea of Japan was regarded as a junior synonym of E. arcticus by Imajima and Hartman (1964).…”

Section: Introductionmentioning

confidence: 99%

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A New Species of Euzonus (Polychaeta: Opheliidae) from Subtidal Zones in Japan

Misaka

Sato

2003

Zoological Science

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“…In the molecular tree, the new species forms a clade with T . ezoensis , a species described from the same area (Hokkaido, Japan) as the new species 34 . The other Thoracophelia clade consists of T .…”

Section: Discussionmentioning

confidence: 99%

Black spicules from a new interstitial opheliid polychaete Thoracophelia minuta sp. nov. (Annelida: Opheliidae)

Jimi

Fujimoto

Takehara

et al. 2021

Sci Rep

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The phylum Annelida exhibits high morphological diversity coupled with its extensive ecological diversity, and the process of its evolution has been an attractive research subject for many researchers. Its representatives are also extensively studied in fields of ecology and developmental biology and important in many other biology related disciplines. The study of biomineralisation is one of them. Some annelid groups are well known to form calcified tubes but other forms of biomineralisation are also known. Herein, we report a new interstitial annelid species with black spicules, Thoracophelia minuta sp. nov., from Yoichi, Hokkaido, Japan. Spicules are minute calcium carbonate inclusions found across the body and in this new species, numerous black rod-like inclusions of calcium-rich composition are distributed in the coelomic cavity. The new species can be distinguished from other known species of the genus by these conspicuous spicules, shape of branchiae and body formula. Further, the new species’ body size is apparently smaller than its congeners. Based on our molecular phylogenetic analysis using 18S and 28S sequences, we discuss the evolutionary significance of the new species’ spicules and also the species' progenetic origin.

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Relating divergence in polychaete musculature to different burrowing behaviors: A study using opheliidae (Annelida)

Law

Dorgan

Rouse

2014

Journal of Morphology

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Divergent morphologies among related species are often correlated with distinct behaviors and habitat uses. Considerable morphological and behavioral differences are found between two major clades within the polychaete family Opheliidae. For instance, Thoracophelia mucronata burrows by peristalsis, whereas Armandia brevis exhibits undulatory burrowing. We investigate the anatomical differences that allow for these distinct burrowing behaviors, then interpret these differences in an evolutionary context using broader phylogenetic (DNA-based) and morphological analyses of Opheliidae and taxa, such as Scalibregmatidae and Polygordiidae. Histological three-dimensional-reconstruction of A. brevis reveals bilateral longitudinal muscle bands as the prominent musculature of the body. Circular muscles are absent; instead oblique muscles act with unilateral contraction of longitudinal muscles to bend the body during undulation. The angle of helical fibers in the cuticle is consistent with the fibers supporting turgidity of the body rather than resisting radial expansion from longitudinal muscle contraction. Circular muscles are present in the anterior of T. mucronata, and they branch away from the body wall to form oblique muscles. Helical fibers in the cuticle are more axially oriented than those in undulatory burrowers, facilitating radial expansion during peristalsis. A transition in musculature accompanies the change in external morphology from the thorax to the abdomen, which has oblique muscles similar to A. brevis. Muscles in the muscular septum, which extends posteriorly to form the injector organ, act in synchrony with the body wall musculature during peristalsis: they contract to push fluid anteriorly and expand the head region following a direct peristaltic wave of the body wall muscles. The septum of A. brevis is much thinner and is presumably used for eversion of a nonmuscular pharynx. Mapping of morphological characters onto the molecular-based phylogeny shows close links between musculature and behavior, but less correlation with habitat.

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Description of a New Sedentary Polychaete, Thoracophelia ezoensis n. sp

Cited by 3 publications

References 0 publications

A New Species of Euzonus (Polychaeta: Opheliidae) from Subtidal Zones in Japan

A New Species of Euzonus (Polychaeta: Opheliidae) from Subtidal Zones in Japan

Black spicules from a new interstitial opheliid polychaete Thoracophelia minuta sp. nov. (Annelida: Opheliidae)

Relating divergence in polychaete musculature to different burrowing behaviors: A study using opheliidae (Annelida)

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