Chone mollis, : Hartman, 1942

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 : 539-542

publication ID

https://doi.org/ 10.1080/00222930701250912

persistent identifier

https://treatment.plazi.org/id/03B1879F-303D-5C69-FE6E-E254C5F0FB65

treatment provided by

Felipe

scientific name

Chone mollis
status

 

Chone mollis View in CoL (Bush in Moore, 1904)

( Figures 10 View Figure 10 , 19B View Figure 19 )

Metachone mollis Bush in Moore 1904, p 216, Plate 35, Figures 19 View Figure 19 , 20, 28.

Chone mollis: Hartman 1942b, p 87 View in CoL , Figures 141–143; 1944, p 279; 1969, p 673; Banse 1972, p 469, Figure 3 View Figure 3 .

Material examined

Type material. California [ YPM 2793 View Materials , holotype], Pacific Grove, Harriman Alaska Expedition , 12, p. 216 W, R. Coe, 1901 .

Non-type material. California [ LACM-AHF], Tomales Bay , 003258, 8 June 1941 (24) . 003240, Sta. 6, coll. G. Jones, August 1958 (78) . 003244, 1610-48 (8). 003245, 211352 (1). 003246, 4938-57 (14). 003247, 5028-57 (9). 003250 (24). 003251, 1958 (15). 003254 (4). [ LACM-AHF], Pitelka, Pelican Point, Sta. 5, 25 June 1941 , sand mud, low tide (3). AB pre 372 P (1). [ LACM-AHF], Monterey Bay , 003256, coll. G. E. MacGinitie, 2 January 1931 (1) . [ LACM-AHF], Central California , 003253 (1). 003255 (5). 003257 (8). [ LACM-AHF], Marina del Rey, MDR 3A, 29 December 1977 (3) . MDR 3A, 16 June 1978 (4). MMS Phase I, Help Collections, MDR 3A, 21 September 1978 (1) . [ LACM- AHF], Newport, 003242, Sta. 11, January 1951 (1) . 003243, Sta. 21, January 1954 (1) . [ LACSD-MBL], Sta. 0194-2D, 30 m (3). Western Mexico [ LACM-AHF], F 3298 , 964-39 (2); M15170-F3311 V-2 (1); N 15184 View Materials -F3336, K-116 (1); N 15174 View Materials -F3326 K-112 (1); F3345, 1260-41(1); F3330, K-133, M15178 (4). [ ECOSUR], Bahía de Todos Santos, coll. SISV, 18 February 1982 (1) . Panama Pacific [ LACM-AHF], coll. H. Lee: CON-D, Sample A, 28 January 1976 (1) ; 5-F, Sample C, 21 March 1976 (2) ; P-E-2, Sample C, 27 March 1976 (1) ; 5-D, Sample A, 5 April 1976 (3) ; 5-D, Sample B, 5 April 1976 (2) ; T-D, Sample C, 6 April 1976 (2) ; CON-F, Sample B, 14 April 1976 (6) ; CON-D, Sample B, 26 April 1977 (3) ; PE2 Sample B, 16 May 1976 (2) ; 5-F, PF1 Sample B, 23 May 1976 (4) ; PF2 Sample B, 24 May 1976 (1) ; P-E-2, Sample C, 24 May 1976 (2) ; Sample A, 25 May 1975 (3) ; 5-F, Sample C, 26 May 1976 (1) ; P-E-2, Sample C, 27 May 1976 (1) ; 5-F, Sample B, 30 May 1976 (3) ; T-D, Sample A, 1 June 1976 (1) ; CON-D, Sample B, 28 July

1976 (1); Freeser 0/1, 6 July 1977 (1); Freeser 0/2, 6 July 1977 (5); Freeser 0/3, 6 July 1977 (4); Freeser 0/5, 6 July 1977 (10); Freeser 0/6, 6 July 1977 (8); Freeser 0/7, 6 July 1977 (1); Freeser 0/8, 6 July 1977 (6); Freeser 0/9, 6 July 1977 (15); P-E-2, Sample C, 3 September 1976 (2).

Description (in parentheses variation of specimens LACM-AHF 003259)

Colour in preserved material, body shape, and size. Body brown coloured with an iridescent layer of epicuticle (separated from the body wall). Trunk cylindrical. Holotype incomplete (no posterior end, and only the left half of the branchial crown), with histolysis. Body length 25 mm (34–39), width 2 mm (2.5–4).

Colour in life. Body cream coloured, collar yellow, ventral shield of collar and ventral thoracic segments whitish, glandular ridge on chaetiger 2 white, iridescent epicuticle; ventral and dorsal lips red; radioles with six to eight irregular red-brown coloured, narrow bands [ LACM-AHF, Tomales Bay, June 2004, LH 04-286-001].

Branchial lobes and branchial crown. Insertion of the branchial lobes not exposed beyond collar. Branchial crown length 8 mm (8–10). Radioles: 17 pairs (13–16). Pinnules from middle region twice as long as more proximal pinnules. Radiolar tips long, elongate ( Figure 10G View Figure 10 ). The palmate membrane extends to three-quarters the length of branchial crown. Lateral flanges broad. Dorsal lips broadly rounded in frontal view, as long as wide, without a mid-rib, resembling the ventral lips. Dorsal pinnular appendages: (five to eight) short pairs united by a palmate membrane. Ventral lips rounded, as long as wide, about one-half of the dorsal lips length. Ventral radiolar appendages (vra): one to five pairs, onequarter to one-half the length of branchial crown ( Figure 19B View Figure 19 ).

Peristomium . Base of the peristomium composed of two lateral horns of basal central skeleton (bcs) surrounding the mouth (mo); anterior peristomial ring lobe (lo) exposed beyond collar, distally triangular, elongate ( Figure 10B–D, F View Figure 10 ). The base of the posterior peristomial ring collar is supported by basal lateral skeleton (bls). Antero-dorsal, lateral, and ventral margins of the posterior peristomial ring collar entire ( Figure 10A–D View Figure 10 ); ventral margin slightly higher than dorsal ( Figure 10C View Figure 10 ); entire length of mid-dorsal margins forms a narrow gap; dorsal pockets well developed. Ventral shield of collar swollen, inside and outside of the collar wall ( Figure 10B View Figure 10 ), horseshoe-shaped, two times wider than long ( Figure 10B, D View Figure 10 ), divided by a median-longitudinal line in large specimens ( Figure 10B View Figure 10 ). Ratio of posterior peristomial ring collar length versus chaetiger 2 length, in lateral view: 2:1.

Thorax. Chaetiger 1: elongate, narrowly hooded chaetae. Chaetigers 2–8: notopodia—two rows of elongate, narrowly hooded chaetae; one anterior row with bayonet chaetae ( Figure 10M View Figure 10 ), two posterior rows with paleate chaetae with minute mucro, not easily discernible ( Figure 10H–K View Figure 10 ); neuropodia—one row of acicular uncini, main fang surmounted by five rows of teeth equal in size, second tooth enlarged, located in the midline, dentition occupying a quarter the length of main fang ( Figure 10L View Figure 10 ). Pre- and postchaetal lobes well developed. Broad glandular, columnar epithelium (gce), swollen in first two ventral thoracic segments, narrow in following thoracic segments ( Figure 19B View Figure 19 ). Narrow glandular ridge on chaetiger 2, it occupies a quarter of the epithelium in longitudinal section ( Figure 19B View Figure 19 ).

Abdomen. Abdominal segments: 42 (41–43), two transverse rows of five to six elongate, narrowly hooded chaetae, chaetae from upper row half as long as chaetae in lower one; uncini with the main fang surmounted by four regular vertical rows of teeth equal in size, occupying one-half the length of main fang, older (dorsalmost) uncini smaller than younger uncini (ventralmost), main fang not extending beyond breast ( Figure 10N View Figure 10 ), breast rectangular. Posterior segments: one or two very elongate, narrowly hooded chaetae; uncini similar to those in anterior abdomen ( Figure 10O View Figure 10 ). Pygidium with rounded posterior margin ( Figure 10E View Figure 10 ).

Gametes. Holotype and specimens from Pacific Panama females with oocytes (oo) in thorax ( Figure 19B View Figure 19 ).

Methyl green staining. The epidermis is completely glandular and stains uniformly in thorax and abdomen, dorsally and ventrally ( Figure 10A–C View Figure 10 ). The ventral shield of collar is not coloured in the anterior margin ( Figure 10B, D View Figure 10 ). Posterior end with granular pattern ( Figure 10E View Figure 10 ).

Remarks

Metachone mollis was established as having thoracic paleate chaetae lacking a mucro; however, Fauvel (1927) transferred this species to Chone , arguing that because the size and length of the mucro varies greatly between species it cannot have generic significance. Reexamination of type material confirmed the presence of a very short hair-like mucro in complete chaetae in holotype. Chone aurantiaca , C. magna , C. picta , and C. mollis have paleated chaetae with mucro minute or absent (Table III). In C. mollis , the ratio of posterior peristomial ring collar length versus chaetiger 2 length is 2:1 (2.5: 1 in C. aurantiaca , 3: 1 in C. magna and C. picta ); the ventral margin of the posterior peristomial ring collar is slightly higher than dorsal (very much higher in C. aurantiaca , C. magna , and C. picta ); the radiolar flanges are narrow (broad in C. aurantiaca ); and the entire length of mid-dorsal margins forms a narrow gap (broad C. magna and C. picta ). Like Chone eiffelturris n. sp., C. mollis is distributed in California, Western Mexico, and Pacific coast of Panama.

R

Departamento de Geologia, Universidad de Chile

MMS

Montshire Museum of Science

AHF

Allan Hancock Foundation, University of Southern California

ECOSUR

El Colegio de la Frontera Sur (Mexico)

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Sabellidae

Genus

Chone

Loc

Chone mollis

Tovar-Hernández, María Ana 2007
2007
Loc

Chone mollis: Hartman 1942b , p 87

Banse K 1972: 469
Hartman O 1942: 87
1942
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