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Polychaeta source details

Tokioka, Takasi. (1970). Droplets from the plankton net XXV. Record of a Rostraria from Seto. Publications of the Seto Marine Biological Laboratory. 18(4): 275-278.
10.5134/175636 [view]
Tokioka, Takasi
Droplets from the plankton net XXV. Record of a <i>Rostraria</i> from Seto.
Publications of the Seto Marine Biological Laboratory
18(4): 275-278
World Polychaeta Database (WPolyDb)
Available for editors  PDF available [request]
[None. Begins as:]
This short note is to record a specimen of Rostraria, which was found in the catch of the Dragonet II, an opening-closing quantitative trawl, trawled on the 50 m deep sand bottom about 1.2 km off Cape Setozaki on June 13, 1966. The specimen was found by Dr. R. Bieri in the upper-net sample which was, however, much contaminated with the upper water during the drawing up of the Dragonet. Thus, the exact level at which the present Rostraria was caught is quite uncertain. At the first sight, the outline of the specimen fixed and preserved in 4% formaldehyde in sea water reminded me of something like Thliptodon, a gymnosomatous pteropod. Further examination under the microscope, however, revealed immediately that the specimen was a polychaete larva. The existence of a pair of stout tentacles showed a close resemblance to some larvae of the family Spionidae. But, in the larvae of Spionidae many segments and then parapodia are completed very early as noted for instance in Hannerz' paper (1956: Zoologiska Bidrag fr. Uppsala, 31, pp. 1-204), and the tentacles may be contracted but never in a coiled state. The very slow development of segments and parapodia and a strongly coiled state of contracted tentacles, caused by uneven distribution of muscles in them, together with a prominent forward stretch of the prostomium and the existence of a pair of bundles of filamentous setae on the first segment, which are all the important characters to define the larvae belonging to Rostraria, are applicable to the present specimen.
Larvae, Larval development, Metamorphosis
Systematics, Taxonomy
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2013-01-12 18:30:12Z
2020-01-08 22:52:49Z

Rostraria bierii Tokioka, 1970 (original description)
 Depth range

Planktonic in the water column over a 50 m deep sand bottom. "The specimen was found [...] in the upper-net sample ... [details]


Pacific Ocean: Japan (off Cape Setosaki [= Seto Saki]; gazetteer estimate 33.67°, 135.31°). [details]

 Editor's comment

The figures of Rostraria bierii Tokioka, 1970 seem to represent a young larval stage of a Magelonidae. [details]


From Tokioka (1970: 275): "[...] the present specimen is described and named provisionally for convenience' sake ... [details]


Planktonic in the water column over a 50 m deep sand bottom. [details]

 Type locality

About 1.2 km off Cape Setosaki [= Seto Saki], Japan (gazetteer estimate 33.67°, 135.31°). [details]