Chone australiensis Hartmann-Schröder, 1979, Hartmann-Schroder, 1979

Tovar-Hernández, María Ana, 2007, On some species of Chone Krøyer, 1856 (Polychaeta: Sabellidae) from world-wide localities, Zootaxa 1518, pp. 31-68: 38

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.5697308

persistent identifier

http://treatment.plazi.org/id/03CE472C-FFB3-FF99-FF7A-FFD2FB2B9CE0

treatment provided by

Plazi

scientific name

Chone australiensis Hartmann-Schröder, 1979
status

 

Chone australiensis Hartmann-Schröder, 1979  

Figure 4 View FIGURE 4

Chone australiensis Hartmann-Schröder, 1979: 151   , Figs 363–367.

Material examined. Type material. Australia [ ZMH P– 15534, holotype], Broome, 8.9. 75, Probe 5.

Description. Colour, body shape, and size. Body cream coloured. Holotype complete. Body length 4 mm, width 0.25 mm. Tube unknown.

Branchial lobes and branchial crown. Insertion of the branchial crown exposed beyond collar dorsally ( Fig. 4 View FIGURE 4 B). Branchial crown length 2 mm. Five radiolar pairs. Radioles with long pinnules. Radiolar tips extremely long ( Figs 4 View FIGURE 4 A–B). The palmate membrane extends a half the length of the branchial crown. Lateral flanges very narrow. Dorsal lips triangular, erect, without mid-rib. Ventral lips rounded, small.

Peristomium   . Anterior peristomial ring lobe not exposed beyond collar, distally entire, triangular. Posterior peristomial ring collar: antero-dorsal margins entire ( Fig. 4 View FIGURE 4 B), lateral margins folded (not incised), ventral margin sligthly higher than dorsal; entire length of mid-dorsal collar margin forms a narrow gap ( Fig. 4 View FIGURE 4 B). Dorsal pockets not developed. Ventral shield of collar horseshoe-shaped, three times wider than long, swollen ( Fig. 4 View FIGURE 4 A). Ratio of posterior peristomial ring collar length versus chaetiger 2 length, in lateral view: 1: 1.

Thorax. Chaetigers 2 to 8: notopodia– two irregular rows of elongate, narrowly hooded chaetae ( Figs 4 View FIGURE 4 C, E); one anterior row with bayonet chaetae; two posterior rows with symmetrical; paleate chaetae with a medium-sized mucro ( Fig. 4 View FIGURE 4 D); neuropodia– one row of acicular uncini per torus, main fang surmounted by four rows of teeth equal in size, occupying half of the main fang length. Glandular ridge on chaetiger 2 very narrow.

Abdomen. Abdominal segments: 32. Anterior segments: two transverse rows of elongate, narrowly hooded chaetae, chaetae from the upper row half as long as chaetae in lower row; uncini with the main fang surmounted by five regular rows of teeth in frontal view, equal in size, occupying one-half the length of main fang, main fang not extending beyond breast, breast rectangular. Posterior segments: 2–3 very elongate, narrowly hooded chaetae; modified uncini with the main fang surmounted by six to seven regular vertical rows of teeth equal in size, occupying three-quarters the length of main fang, main fang not extending beyond breast, breast rectangular. Pygidium with a triangular posterior margin ( Fig. 4 View FIGURE 4 A).

Gametes. Holotype inmature.

Methyl green staining. Ventral collar shield not stained ( Fig. 4 View FIGURE 4 A); thorax with epidermis completely glandular, stains uniformly, dorsal and ventrally ( Figs 4 View FIGURE 4 A–B); abdomen less coloured ( Fig. 4 View FIGURE 4 A).

Remarks. Chone australiensis   was described as having the lateral collar margin incised, as Hartmann- Schröder (1979) shows in her figure 364; however, re-examination of the holotype shows that the lateral margin of collar is entire. The drawings of Hartmann-Schröder were made with the holotype mounted in a slide, where the collar is folded, not incised.

Chone australiensis   and C. normani   have the anterior abdominal uncini with equal sized teeth above the main fang. In C. australiensis   , the ratio of posterior peristomial ring collar length versus chaetiger 2 length is 1: 1 (1.5: 1 in C. normani   ); the radiolar flanges are narrow (broad in C. normani   ); extra long radiolar tips (medium-sized in C. normani   ); the anterior peristomial ring lobe is triangular, not exposed beyond collar (bilobed, exposed beyond collar in C. normani   ) and short mucro (long in C. normani   ) ( Table 2 View TABLE 2 ).

ZMH

Zoologisches Museum Hamburg

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Sabellidae

Genus

Chone

Loc

Chone australiensis Hartmann-Schröder, 1979

Tovar-Hernández, María Ana 2007
2007
Loc

Chone australiensis Hartmann-Schröder, 1979 : 151

Hartmann-Schroder 1979: 151
1979