Chone usticensis, Giangrande & Licciano & Castriota, 2006

Giangrande, Adriana, Licciano, Margherita & Castriota, Luca, 2006, Description of Chone usticensis sp. nov. (Polychaeta, Sabellidae) from the Mediterranean Sea, Zootaxa 1168, pp. 51-58 : 53-57

publication ID

https://doi.org/ 10.5281/zenodo.2645530

publication LSID

lsid:zoobank.org:pub:F03E0C12-21AA-4359-81CE-C8BDCC05AB5A

DOI

https://doi.org/10.5281/zenodo.6262070

persistent identifier

https://treatment.plazi.org/id/A95FD15E-6746-1E5C-F126-6371FCCBFE63

treatment provided by

Plazi

scientific name

Chone usticensis
status

sp. nov.

Chone usticensis View in CoL sp. nov.

Figures 2 View FIGURE 2 –4

Material examined

Type material: Holotype, MNCN 16.01/10325, collected by L. Castriota at station A, 38°41.50’ N 13°09.78’ E, in November 1997, at 50 m depth on a soft­bottom mainly composed of medium sand, biogenic and volcanic particles, together with a significant amount of red calcareous algae GoogleMaps . Paratypes, MNCN 16.01/10326, 3 specimens from the same station.

Non­type material from the same locality (held in the personal collection of A. Giangrande): station A, 20 specimens Nov 96, 11 specimens July 97, 25 specimens November 97; station B, 48 specimens November 96, 40 specimens July 97, 59 specimens November 97; station C, 35 specimens November 96, 8 specimens July 97, 522 specimens November 97.

Description

Holotype complete, with 8 thoracic and 30 abdominal chaetigers ( Fig. 2A View FIGURE 2 ). Branchial crown length 10 mm, total thorax­abdomen length 20 mm, maximum width 2.5 mm. Branchial lobes each with 10 fully developed radioles and one to two ventral radiolar appendages ( Fig. 3A View FIGURE 3 ); radioles with palmate membrane for less than half of their length; radiolar flanges present distally to palmate membrane, but with radioles terminating as very long filaments ( Fig. 2B View FIGURE 2 ). All pinnules of similar length. Radiolar skeleton axis composed of two rows of cells; outer surfaces of radioles flat. Dorsal lips pointed, longer than wide, radiolar appendages not visible, with one or two pinnular appendages. Ventral lips rounded, with radiolar appendage ( Fig. 3A, B View FIGURE 3 ). Collar high with a mid­dorsal narrow gap, and slightly higher ventrally ( Fig. 2C View FIGURE 2 ), ventral lobe of anterior peristomial ring pointed and extending slightly beyond ventral collar margin ( Fig. 2D View FIGURE 2 ).

Thoracic notopodia in chaetiger 1 with 4 narrowly hooded chaetae. Notopodial fascicle from chaetigers 2–8 with superior group of 3–4 elongate narrowly hooded chaetae (Fig. 4C) and inferior group with 4–5 paleate chaetae posteriorly and 4–5 bayonet type anteriorly. Paleate chaetae with long tip (Fig. 4D). Neuropodial acicular uncini in number of about 13 per torus, with a series of small teeth of similar size over the main fang, with hood present, and breast only developed as slight swelling; handles very long (Fig. 4E, F). Abdominal neuropodial fascicles with modified, elongate narrowly hooded chaetae, longer in the posterior segment (Fig. 4A, B). Abdominal notopodia with 12–13 avicular uncini, with main fang surmounted by 5–6 rows of small teeth, breast rectangular, not extending beyond distal end of proximal tooth, handles absent. Intertorus variation in morphology present, with uncini from anterior abdominal segments as in Fig. 4H, and uncini from posterior abdominal segments as in Fig 4I. Intratorus variation present as well (Fig. 4G). Pygidium triangular with long cirrus ( Fig. 2A, E View FIGURE 2 ). Thoracic ventral glandular shields visible in thoracic chaetigers. Body cream coloured. Tube not observed.

Remarks

Chone usticensis View in CoL together with another Mediterranean species, C. filicaudata Southern, 1914 View in CoL , and C. americana Day, 1973 View in CoL , have a pygidial cirrus filament. Chone usticensis View in CoL and C. filicaudata View in CoL differ in the radiolar flanges which in C. filicaudata View in CoL are developed until the end of radioles, in the length of palmate membrane, shorter in C. usticensis View in CoL , in the shape of the paleate chaetae, wider in C. usticensis View in CoL , and in the shape of the anterior peristomial ring lobe, entire and not incised in C. usticensis View in CoL . Concerning the latter feature, C. usticensis View in CoL is similar to C. americana View in CoL , but differs in the shape of the thoracic uncini, which in C. americana View in CoL are provided with teeth of unequal size above the main fang ( Tovar­Hernández 2005), in the shape of the collar, ventrally lower in C. americana View in CoL , in the shape of thoracic paleate chaetae, which has a longer tip in C. usticensis View in CoL , and in the shape of abdominal uncini, which in C. americana View in CoL have a smaller number of teeth over the main fang. Chone usticensis View in CoL also shows similarity to some Mediterranean specimens previously collected and reported as Chone View in CoL sp. ( Giangrande 1992). However, the features of the branchial crown, a lower palmate membrane and a shorter filiform tips of the radioles, distinguishes this taxon from C. usticensis View in CoL .

Most of the specimens of the examined population were small sized (around 10 mm in total length). The holotype was selected from the best­preserved larger specimens because we assume it to be an adult, although gametes were not detected. Oocytes in the abdomen have been observed in some non­type material of a similar size as the holotype. The number of dorsal pinnular appendages seems to vary according to the size of individuals, with only one in smaller ( Fig. 3A View FIGURE 3 ), and two in larger specimens ( Fig. 3B View FIGURE 3 ).

Type locality Offshore on South Coast of Ustica Island at 38°41.50’ N 13°09.78’ E.

Etymology The species is named after the type locality.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Sabellidae

Genus

Chone

Loc

Chone usticensis

Giangrande, Adriana, Licciano, Margherita & Castriota, Luca 2006
2006
Loc

Chone usticensis

Giangrande & Licciano & Castriota 2006
2006
Loc

Chone usticensis

Giangrande & Licciano & Castriota 2006
2006
Loc

C. usticensis

Giangrande & Licciano & Castriota 2006
2006
Loc

C. usticensis

Giangrande & Licciano & Castriota 2006
2006
Loc

C. usticensis

Giangrande & Licciano & Castriota 2006
2006
Loc

C. usticensis

Giangrande & Licciano & Castriota 2006
2006
Loc

C. usticensis

Giangrande & Licciano & Castriota 2006
2006
Loc

Chone usticensis

Giangrande & Licciano & Castriota 2006
2006
Loc

C. usticensis

Giangrande & Licciano & Castriota 2006
2006
Loc

Chone

Giangrande 1992
1992
Loc

C. americana

Day 1973
1973
Loc

C. americana

Day 1973
1973
Loc

C. americana

Day 1973
1973
Loc

C. americana

Day 1973
1973
Loc

C. americana

Day 1973
1973
Loc

C. filicaudata

Southern 1914
1914
Loc

C. filicaudata

Southern 1914
1914
Loc

C. filicaudata

Southern 1914
1914
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