Euchone sp.
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publication ID |
https://doi.org/ 10.1080/00222930600901458 |
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persistent identifier |
https://treatment.plazi.org/id/03C2878E-1F32-FFB8-FDC8-F675FE5AFDF5 |
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treatment provided by |
Felipe |
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scientific name |
Euchone sp. |
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( Figure 4 View Figure 4 )
as Euchone southerni in Giangrande (1989).
Examined material
Two specimens from Tyrrhenian Sea, 55 m, detritic substratum, 2000, PCZL.
Description
Small species with eight thoracic and 15 abdominal chaetigers ( Figure 4A View Figure 4 ) of which five form the anal depression. Total length 6 mm; maximum width 0.3 mm. Branchial lobes each with four fully developed radioles with palmate membrane for about half of their length; radiolar flanges present distally to palmate membrane; radioles with filiform tip. Dorsal lips and radiolar appendages not observed because of the poor preservation of the crown. Two ventral radiolar appendages. Ventral lips not observed. Collar high, slightly higher ventrally, with a very small ventral incision ( Figure 4B, C View Figure 4 ). Collar terminating at about the same level of the insertion of branchial lobes. Staining pattern showing a peculiar shape in the collar, with only two semicircular spots ( Figure 4B View Figure 4 ). Glandular ridge on chaetiger 2. Notopodial fascicle from chaetigers 2–8 with superior group of four elongated largely hooded chaetae and inferior group with two paleate chaetae posteriorly and two bayonet-type anteriorly. Paleate chaetae narrow and with long tip ( Figure 4E View Figure 4 ). Neuropodial uncini six per torus, with small teeth of similar size over the main fang. Abdominal neuropodial fascicles with modified, elongate narrowly hooded chaetae. Notopodia with eight avicular uncini, with main fang surmounted by four rows of small teeth ( Figure 4F View Figure 4 ). Intratorus variation absent. Uncini of the anal depression rasp-shaped ( Figure 4G View Figure 4 ). Anal depression formed by five chaetigers, with large and entire wings ( Figure 4D View Figure 4 ).
Remarks
This taxon was firstly identified as E. southerni , for the low number of chaetigers forming the anal depression. Giangrande (1989) recorded E. southerni in the Mediterranean (Adriatic Sea) from coralligenous habitat. Unfortunately, the bad preservation of this material does not allow a re-examination. However, the specimens examined here from the Tyrrhenian Sea differ from the descriptions of E. southerni by Southern (1914) and Banse (1970) in having the collar higher ventrally with a more evident incision, even though not so deep as in E. southerni incisa ( Banse 1970) and for the higher number of pre-depression abdominal chaetigers. Euchone sp. is a species larger than E. southerni and with more elongate abdominal chaetigers. Unfortunately the bad preservation of the crown does not allow the description of a new taxon.
Habitat
Deep detritic bottom.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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