Chone KrØyer, 1856

Tovar-Hernández, María Ana, 2007, Revision of Chone Krøyer, 1856 (Polychaeta: Sabellidae) from North America and descriptions of four new species, Journal of Natural History 41 (9 - 12), pp. 511-566 : 513-516

publication ID	https://doi.org/ 10.1080/00222930701250912
persistent identifier	https://treatment.plazi.org/id/03B1879F-3023-5C4F-FDD9-E059C733FC0B
treatment provided by	Felipe
scientific name	Chone KrØyer, 1856
status

Treatment

Chone KrØyer, 1856 View in CoL

Chone albocincta Banse, 1972 View in CoL

( Figure 1 View Figure 1 )

Chone albocincta Banse 1972, p 479 View in CoL –481, Figure 8a–j View Figure 8 .

Material examined

Type material. California [ LACM-AHF POLY 0455 , 11 paratypes], Velero, Sta. 6104, 33 ° 399450N, 118 ° 069400W, 26 m, dark grey silty fine sand, 19 February 1959 .

Non-type material. Oregon [ LACM-AHF], Columbia River, Vessel Cayuse, Cruise 74128, OSU 3009 View Materials , Sta. 97, coll. MDR, 5 December 1974, 77 m (1). Cruise 7601A, Sta. 1796, coll. MDR, 5 January 1976, 82 m (1). California [ LACM-AHF], Tomales Bay, 003248, 5745 (1). [ LACM-AHF], Goleta , NPDES , Sta. 5, Rep. 1, N 959, 29 October 1985 (2). [ CSD-MBL], Point Loma, Sta. A 1, 32 ° 39.569N, 117 ° 15.729W, 14 January 1986, 18 m (1); Sta. A 11, 32 ° 39.989N, 117 ° 16.279W, 28 January 1986, 49 m (6); Sta. A 12, 32 ° 40.479N, 117 ° 16.429W, 30 January 1986, 47 m (1); Sta. A 14-4, 32 ° 41.439N, 117 ° 16.639W, 16 April 16 1986, 47 m (2). [ LACSD-MBL], San Diego, Sta. 0700-10D, 30 m (2); Sta. 0191-00, 30 m (1); Sta. 0794-7D, 30 m (1); Sta. 0701-0D, 30 m (1); Sta. 0100-7D, 30 m (1). [PC- RR], City of San Diego , PLOO GoogleMaps Survey, B-1, 1.08 m, 153 (1). MMS Phase II [ LACM- AHF], S. Williams CAMP 1-3 , Sta. R-8, Rep. 2, Fr 0.5, Sec 0-10 (1); CAMP 2-3 , Sta. R-8, Rep. 1, Fr 0.5, Sec 0-10 (1); CAMP 2-3 , Sta. R-8, Rep. 2, Fr 0.5, Sec 0-10 (2); CAMP 2-4 , Sta. R-8, Rep. 1. Fr 0.5, Sec 0-10 (1); CAMP 2-4 , Sta. R-8, Rep. 2, Fr 0.5, Sec 0-10 (1); CAMP 2-5 , Sta. R-8, Rep. 3, Fr 0.5, Sec 0-10 (2); CAMP 3-1 , Sta. R-8, Rep. 3, Fr 0.5, Sec 0-10 (1). BLM, BFI [ LACM-AHF], 22912 (1); 22962 (1); 22979 (1); 2303a (1); 23040 (1); 23045 (1); 23189 (1); 23192 (1); 23192 (2); 23195 (1); 23201 (1); 23202 (1); 23205 (1); 23205 (1); 2912 (1); 80150 (1); 80503 (1); 80504 (1); 80632 (1); 81901 (1); 81905 (1); 81919 (1); 81921 (1); 81922 (1); 81923 (1); 81924 (2); 8272 (1); 83002 (1); 84703 (1). Western Mexico [ LACM-AHF], F3310 , 6179-59 (1).

Additional material. Chone veleronis Banse, 1972 [ LACM-AHF POLY 0460 , paratypes] .

Description (based on paratypes, in parentheses variation of specimens from Phase II)

Colour, body shape, and size. Body cream coloured; each thoracic and anterior abdominal segment has two yellow-whitish glandular ridges; glandular ridge in chaetiger 2 brownorange. Body red-brown in life with whitish glandular rings ( Banse 1972). Trunk cylindrical, posterior abdomen depressed dorso-ventrally ( Figure 1D View Figure 1 ). Body length 5– 14 mm (2.5–21), width 0.3–1.5 mm (0.25–1.5). Tubes unknown.

Branchial lobes and branchial crown. Insertion of the branchial crown not exposed beyond collar ( Figure 1A View Figure 1 ). Branchial crown length 5–7.5 mm (2–10). Radioles: seven to eight pairs (five to ten). Radioles with median pinnules two times longer than more proximal pinnules. Radiolar tips long. The palmate membrane extends three-quarters the length of the branchial crown (it almost reaches the radiolar tips). Lateral flanges broad ( Figure 1G View Figure 1 ). Dorsal lips triangular, erect, without mid-rib. Ventral lips rounded, about three-quarters the length of the dorsal lips. Ventral radiolar appendages: one pair, as long as branchial crown.

Peristomium . Anterior peristomial ring lobe not exposed beyond collar, distally entire, triangular. Posterior peristomial ring collar: dorsal, ventral and lateral margins entire ( Figure 1A–C View Figure 1 ), ventral margin higher than dorsal ( Figure 1C View Figure 1 ), entire length of mid-dorsal collar margins forms a narrow gap ( Figure 1A View Figure 1 ). Ventral shield of collar rounded, with an anterior, small whitish triangle, and two postero-lateral grooves ( Figure 1B, C View Figure 1 ). Ratio of posterior peristomial ring collar length versus chaetiger 2 length, in lateral view: 2.5:1.

Thorax. Chaetiger 1: two groups of elongate, narrowly hooded chaetae. Chaetigers 2–8: notopodia—two irregular rows of elongate, narrowly hooded chaetae; one anterior row with bayonet chaetae; two posterior rows with symmetrical; paleate chaetae with medium-sized mucro ( Figure 1I, J View Figure 1 ); 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 ( Figure 1H View Figure 1 ). Pre- and post-chaetal lobes well developed. Glandular ridge on chaetiger 2 (gr2): narrow dorsally ( Figure 1A View Figure 1 ), broad ventrally ( Figure 1B View Figure 1 ); in dorsal view it almost reaches the anterior margin of the intra-notochaetal groove ( Figure 1A View Figure 1 ).

Abdomen. Abdominal segments: 31–48 (26–47). Anterior segments: two transverse rows of elongate, narrowly hooded chaetae, chaetae from 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 ( Figure 1E View Figure 1 ). Posterior segments: 1–2 very elongate, narrowly hooded chaetae, 25% longer than in anterior segments; 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 ( Figure 1F View Figure 1 ). Pygidium with triangular posterior margin ( Figure 1D View Figure 1 ).

Methyl green staining. The anterior margin of the collar is not coloured; the posterior half of the collar is darker than anterior half; anterior half with grooves and dark spots, the triangle above the ventral shield is not coloured. Thorax and anterior abdomen with epidermis completely glandular, stains uniformly, dorsally ( Figure 1A View Figure 1 ), ventrally ( Figure 1B View Figure 1 ), and laterally ( Figure 1C View Figure 1 ). Posterior end with dark glands ( Figure 1D View Figure 1 ). After 1 day, body stays stained, except the posterior abdomen.

Gametes. Paratypes immature.

Remarks

Chone albocincta , C. veleronis , and C. eiffelturris n. sp. (see below) are distinguished from other species of the genus by the whitish segmental rings in the thorax and anterior abdomen (Table II). Chone albocincta can be distinguished from C. veleronis and C. eiffelturris n. sp. by the following: the glandular ridge on the second chaetiger is broad ventrally, dorsally it extends to the anterior margin of the intra-notochaetal groove (ventrally greatly broadened extending into the third chaetiger, dorsally narrow in C. veleronis ; narrow, same width in C. eiffelturris n. sp.); the ventral shield of collar is rounded with an anterior whitish triangle and two postero-lateral grooves (ventral shield of collar horseshoe-shaped, three times longer than wide in C. veleronis ; 2.5 times longer than wide in C. eiffelturris n. sp.); short branchial lobes in C. albocincta and C. eiffelturris n. sp. (long in C. veleronis ).