Chone normani McIntosh, 1916, McIntosh, 1916

Tovar-Hernández, María Ana, 2007, On some species of Chone Krøyer, 1856 (Polychaeta: Sabellidae) from world-wide localities, Zootaxa 1518, pp. 31-68: 50-52

publication ID

http://doi.org/ 10.5281/zenodo.177378

publication LSID

lsid:zoobank.org:pub:B0C3B3D8-4806-4C6D-A6B9-4670C919EDDB

DOI

http://doi.org/10.5281/zenodo.5697320

persistent identifier

http://treatment.plazi.org/id/03CE472C-FFA7-FF84-FF7A-FDFDFCF99E78

treatment provided by

Plazi

scientific name

Chone normani McIntosh, 1916
status

 

Chone normani McIntosh, 1916  

Figure 11 View FIGURE 11

Chone normani McIntosh, 1916: 65   –67, Pl. 2, Figs 13–15 View FIGURE 13 View FIGURE 14 View FIGURE 15 , Pl. 3, Figs 14–15 View FIGURE 14 View FIGURE 15 .

Material examined. Non-type material. Scotland [ NMW.Z], Calback Ness and Little Roe, Sullom Voe, Shetland Isles: 1997.078 .0 0 62, Sta. B 49, D, medium to coarse sand, 20 m, Coll. IOE (2). North Sea [ ZMH], P– 13285, AD 723, Sta. 2 (9).

Additional material. Chone duneri Malmgren, 1867   [ ZMUC POL – 1755, Norway]. Chone infundibuliformis Kr ø   yer, 1856 [ ZMUC POL – 1749, lectotype].

Description. Colour, body shape, and size. Body cream coloured. Trunk cylindrical. Body length 3.5–10 mm, width 0.5–1.5 mm. Tubes unknown.

Branchial lobes and branchial crown. Insertion of the branchial lobes not exposed beyond collar ( Fig. 11 View FIGURE 11 C). Branchial crown length: 2.5 mm. Radioles: 6 pairs. Median pinnules three times longer than more proximal pinnules. Radiolar tips triangular, medium-sized. Palmate membrane extends three quarters the length of the branchial crown. Lateral flanges broad ( Fig. 11 View FIGURE 11 A). Dorsal lips rounded, without mid-rib. Ventral lips rounded, about one quarter of the dorsal lips length. Ventral radiolar appendages: one pair, about half the length of the branchial crown.

Peristomium   . Anterior peristomial ring lobe exposed beyond collar, distally bilobed. Posterior peristomial ring collar: ventral, dorsal and lateral margins entire, ventral slightly higher than dorsal ( Figs 11 View FIGURE 11 B–C); entire length of mid-dorsal collar margins forms a narrow gap. Dorsal pockets well developed. Ventral collar shield swollen, horseshoe-shaped, two times wider than long ( Fig. 11 View FIGURE 11 B). Ratio of posterior peristomial ring collar length versus chaetiger 2 length, in lateral view: 1.5: 1.

Thorax. Elongate, narrowly hooded chaetae; narrowly hooded bayonet chaetae, two posterior rows with symmetrical, paleate chaetae with long mucro ( Fig. 11 View FIGURE 11 F). Uncini with the main fang surmounted by three rows of equal sized teeth, occupying a half the length of the main fang ( Fig. 11 View FIGURE 11 G). Narrow glandular ridge on chaetiger 2.

Abdomen. Abdominal segments: 17. Elongate, narrowly hooded chaetae ( Fig. 11 View FIGURE 11 H), upper row chaetae half as long as lower row ones; uncini with the main fang surmounted by three rows of equal in size teeth, occupying one half of the main fang length, main fang not extending beyond breast, breast rectangular ( Fig. 11 View FIGURE 11 D). Posterior segments: 1–2 very elongate, narrowly hooded chaetae, 25 % longer than in anterior segments; uncini modified ( Fig. 11 View FIGURE 11 E). Pygidium with rounded posterior margin ( Fig. 11 View FIGURE 11 A).

Gametes. Oocytes in thorax and abdomen.

Methyl green staining. Only the basal half of the ventral shield of collar is coloured ( Figs 11 View FIGURE 11 A–B). Body coloured uniformly ventrally ( Fig. 11 View FIGURE 11 A), dorsally is not coloured ( Fig. 11 View FIGURE 11 C), pygidium is not stained.

Remarks. Chone normani   have broad flanges and triangular radiolar tips of medium-sized; and abdomen shorter than thorax. For comparison, C. infundibuliformis   has broad flanges but radiolar tips very short and rounded; and abdomen longer than thorax. Chone normani   differ of C. duneri   by having flanges very broad (narrow in C. duneri   ), radiolar tips medium-sized (extra long in C. duneri   ), base of the branchial lobes not exposed beyond collar (exposed in C. duneri   ) and posterior abdominal uncini modified (not modified in C. duneri   ). Both species have the anterior peristomial ring lobe exposed beyond collar, bilobed.

Chone normani   has not been recorded since their description; however, the species could be well represented in shallow waters. Probably, specimens of C. normani   are mixed in samples previously identified as C. infundibuliformis   , C. duneri   or C. fauveli   . In this study I propose to use the shape of the radiolar tip as first step to identify C. normani   (the McIntosh’s figure is useful: Pl. 3, Fig. 14 View FIGURE 14 ), followed by other features of the anterior and posterior peristomial ring collar and uncini.

NMW

Naturhistorisches Museum, Wien

ZMH

Zoologisches Museum Hamburg

ZMUC

Zoological Museum, University of Copenhagen

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Sabellidae

Genus

Chone

Loc

Chone normani McIntosh, 1916

Tovar-Hernández, María Ana 2007
2007
Loc

Chone normani

McIntosh 1916: 65
1916