Euchone pseudolimnicola, Giangrande & Licciano, 2006
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publication ID |
https://doi.org/ 10.1080/00222930600901458 |
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persistent identifier |
https://treatment.plazi.org/id/03C2878E-1F3C-FFBA-FE49-F0E9FE5AFBCF |
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treatment provided by |
Felipe |
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scientific name |
Euchone pseudolimnicola |
| status |
sp. nov. |
Euchone pseudolimnicola View in CoL n. sp.
( Figure 3 View Figure 3 )
Holotype: South Coast of Ustica Island , 50 m depth, 38 ° 4195000N, 13 ° 0997800E, on softbottom mainly composed of medium sand, biogenic and volcanic particles together with a significant amount of red calcareous algae, MNCN 16.01 About MNCN /10327 . Paratypes: six specimens from the same locality of holotype ; one specimen from Gulf of Policastro , 1987, Tyrrhenian Sea, 40 m depth, PCZL ; two specimens from Brindisi , 1989, Adriatic Sea, 40 m depth, PCZL .
Description
Holotype complete with eight thoracic and 28 abdominal chaetigers ( Figure 3A, B View Figure 3 ), of which nine form the anal depression. Branchial crown length 2.3 mm; total thorax– abdomen length 4 mm; maximum width 0.3 mm. Branchial lobes each with six fully developed radioles with palmate membrane for about half of their length; radiolar flanges present distal to palmate membrane; radioles terminating as extra long filaments ( Figure 3F View Figure 3 ). Dorsal lips pointed with internal blood vessel, dorsal radiolar appendage as long as enlarged basal dorsal lip length ( Figure 3G View Figure 3 ). Ventral lips not detected, four pairs of ventral radiolar appendages about three-quarters length of the radioles ( Figure 3A View Figure 3 ). Collar high, slightly higher ventrally, irregularly crenulated except dorsally, with two very long ventral lappets and a mid-dorsal narrow gap ( Figure 3A, C View Figure 3 ); ventral lobe of anterior peristomial ring covered by collar margin. Ventral shield visible only after staining. Very uniform staining pattern degrading towards the end of the thorax ( Figure 3A View Figure 3 ) and reduced to only small spots in the abdomen ( Figure 3D View Figure 3 ). Glandular ridge present on chaetiger 2. Notopodia in chaetiger 1 with six narrowly hooded chaetae. Notopodial fascicle from chaetigers 2–8 with superior group of four elongated narrowly hooded chaetae ( Figure 3N View Figure 3 ) and inferior group with two paleate chaetae posteriorly and two bayonet-type anteriorly. Paleate chaetae with long tip ( Figure 3O View Figure 3 ). Neuropodial uncini eight per torus, with teeth of different sizes over the main fang, one of which very developed ( Figure 3M View Figure 3 ). Abdominal neuropodial fascicles with modified, elongate narrowly hooded chaetae. Notopodia with 9– 10 avicular uncini, with main fang surmounted by three or four rows of teeth of different size as in the thorax uncini ( Figure 3H, L View Figure 3 ). Intratorus variation absent. Uncini of the anal depression not highly modified, but with more teeth of similar size over the main fang ( Figure 3I View Figure 3 ). Anal depression formed by nine chaetigers, with a distinct ridge present only in the uppermost part. Pygidium rounded showing in most of the specimens a filiform appendix ( Figure 3E View Figure 3 ). Tube incrusted with detritus and sand.
Etymology
The species is named after the similarity to the very peculiar anal depression of E. limnicola .
Remarks
Euchone pseudolimnicola is similar to E. limnicola Reish, 1960 in having the anal depression without wings, but showing a distinct ridge marking the anterior edge. However, a lot of characters make the first species different from the latter: the crenulated margin of the collar; the less development of palmate membrane; the higher number of abdominal chaetigers; the shape of thoracic uncini with teeth of unequal size above the main fang; the lower number of abdominal uncini; the absence of ventral shields.
The holotype, which has been chosen for the best preservation of the branchial crown, lacks pygidial appendage, which, however, has been detected in most of the paratypes, underlining that this structure can be easily lost. Lastly, the dentition pattern of both thoracic and abdominal uncini appears very peculiar, with a second highly developed and asymmetric tooth over the main fang.
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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