Chone rosea Hartmann-Schroder 1965
Creators: name: Tovar-Hernández, María Ana
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Sabellida
Sabellidae
Chone
Chone rosea

description: Chone rosea Hartmann-Schröder, 1965
Figure 14
Chone rosea Hartmann-Schröder, 1965: 276 –278, Figs 279–280.
Material examined. Type material. off South Chile [ZMH P–15202, holotype], Exp. Mar Chile I, March 1960.
Additional material. Chone bimaculata Banse and Nichols, 1968 [USNM 36280, paratypes]. Chone duneri Malmgren, 1867 [ZMUC POL –1755, topotypes]. Chone dunerificta Tovar-Hernández et al. (2007) [MNCN 16.01/7369, holotype].
Description. Colour, body shape, and size. Holotype complete. Body cream-coloured. Trunk cylindrical. Body length 17 mm, width 2 mm. Tube unknown.
Branchial lobes and branchial crown. Insertion of the branchial crown not exposed beyond collar (Figs 14 A–C). Branchial crown length: 19 mm. Radioles: 9 pairs. Median pinnules longer than more proximal pinnules. Radiolar tips extra long (7 mm) (Figs 14 A, G). Palmate membrane extends about half the length of the branchial crown. Lateral flanges broad (Fig. 14 G). Dorsal lips broadly rounded, as long as wide, without midrib. Dorsal pinnular appendages: two short pairs united by a membrane. Ventral lips rounded, as long as wide, about half of the dorsal lips length. Ventral radiolar appendages: three pairs, the first about one quarter the length of the branchial crown, the rest about a half of the branchial crown.
Peristomium. Anterior peristomial ring lobe not exposed beyond collar (Fig. 14 B), distally entire, triangular. Posterior peristomial ring collar: antero-dorsal, ventral and lateral margins entire, ventral margin slightly higher than dorsal (Figs 14 A–C); the entire length of mid-dorsal collar margins is overlapped (Fig. 14 C). Dorsal pockets not developed. Ventral shield of collar sunglasses-shaped, swollen (Fig. 14 B). Ratio of posterior peristomial ring collar length versus chaetiger 2 length, in lateral view: 2:1.
Thorax. Chaetiger 1: two groups of elongate, narrowly hooded chaetae. Chaetigers 2 to 8: Notopodia: superior group with two irregular rows of elongate narrowly hooded chaetae; inferior group with one anterior row of bayonet chaetae; two posterior rows with paleate chaetae with short mucro (Fig. 14 D). Neuropodia: acicular uncini distributed as a regular row, second tooth enlarged (not illustrated), located in the midline, dentition covering one quarter the length of the main fang (Fig. 14 E). Glandular ridge on chaetiger 2 narrow.
Abdomen. Abdominal segments: 35. Anterior segments: two transverse rows of elongate, narrowly hooded chaetae, upper row chaetae half as long as lower row ones; uncini with the main fang surmounted by four rows of teeth in frontal view, occupying less than half of the main fang length, main fang not extending beyond breast (Fig. 14 H). Posterior segments: very elongate, narrowly hooded chaetae, 25% longer than those of anterior segments; uncini similar to those in anterior abdomen, but smaller (Fig. 14 I). Pygidium with rounded posterior margin (Fig. 14 A).
Gametes. Spermatozoa with barrel-shaped nucleus, mushroom-shaped acrosome and two rounded mitochondria (Fig. 14 F).
Methyl green staining. Ventrally body stains uniformly, except for the basal half of the collar that is less coloured (Figs 14 B); dorsally body stains uniformly, except for the faecal groove (Fig. 14 C).
Remarks. Chone rosea is unique by having a long collar; the ventral shield of collar is remarkable because it is sun glasses-shaped (Table 2); the mid-dorsal collar margins overlap and extremely long radiolar tips. Other species with extra long radiolar tips (but shorter than C. rosea) are C. duneri, C. dunerificta and C. bimaculata; but the anterior peristomial ring lobe is triangular, not exposed beyond collar in C. rosea (bilobed, exposed in all others).
description: Published as part of Tovar-Hernández, María Ana, 2007, On some species of Chone Krøyer, 1856 (Polychaeta: Sabellidae) from world-wide localities, pp. 31-68 in Zootaxa 1518 on pages 55-56, DOI: 10.5281/zenodo.177378