Chone farringtonae, Tovar-Hernández, María Ana, 2005

Tovar-Hernández, María Ana, 2005, Redescription of Chone americana Day, 1973 (Polychaeta: Sabellidae) and description of five new species from the Grand Caribbean Region, Zootaxa 1070, pp. 1-30 : 13-18

Chone farringtonae sp. nov.

Figures 5 A–G, 6A – O, 7A–E

Material examined

Type material: Holotype [ FSBC I 66733], Paratypes [ FSBC I 66734] EJ76126 (18, 1 mounted in gold for SEM), [ECOSUR 0052] (2): West Coast of Florida, off shore Pinellas County, Boca Ciega Bay, June 17, 1976.

Non type material: Western Florida [ FSBC EJ64018] Cat. 15475, Pinellas County, Boca Ciega Bay, 27° 48’ 17’’ N, 82° 45’ 53’’ W, 2 m (1). [ FSBC EJ83225] Cat. 33694, Pinellas County, Channel marker 2, Hurricane Pass, 28° 04’ N, 82° 50’ W, 6.09 m (1). [ FSBC EJ66817] West coast of Florida (2). [ FSBC] West of Egmont Key, Transect 2, 6.09 m, March 7, 1979, sand and shell, Coll. Jack L. Taylor (1). Eastern Florida [ UMML] Lake Worth, Sta. 28, May 30, 1974, Sta. 20, August 22, 1974, Sta. 28, January 30, 1975 (15, 1 mounted in gold for SEM).

Additional material: Chone aurantiaca ( Johnson, 1901) , holotype [ MCZ 1933] Port Orchard, Puget Sound, Washington, Coll. A. Robertson, July 4, 1898. Chone magna ( Moore, 1923) , holotype [ USNM 17281] Off Harris, Pt. San Miguel, California, Albatross R/V, Sta. 4436, April 15, 1904.

Description (inside parentheses variation observed in paratypes)

Color, body shape and size: Body pale in preserved material; depressed in all their length, a ventral compression along last 13 abdominal segments ( Figure 5 G); BoL= 18 mm (3–35), W= 0.5 mm (0.25–1.25).

Branchial crown: BrCL= 8 mm (1.5–8), RML/BrCL= 0.75/1. Radioles: 9 (6–12) pairs, narrow flanges, pinnules long, of similar length throughout radiole, RT= medium­sized [9 pinnules] ( Figure 5 F). BrL= small, insertion not exposed beyond collar ( Figures 5 A–D, 7A–B). DL= 3 times longer than wide, without a discernable longitudinal ridge. VL= rounded, as long as wide, about one half of the DL length. VRA= 2 pairs, about one half of the BrCL.

Peristomium : APRL= not exposed beyond collar, ventral margin distally entire, short, triangular. PPRC= antero­dorsal, lateral and ventral collar margins entire ( Figures 5 C–D, 7A–B), ventral higher than dorsal ( Figures 5 A, C, 7A), longitudinal grooves in ventral and lateral sides ( Figures 5 A, 7A–B). VSC= swollen, horseshoe­shaped, 3 times longer than wide ( Figures 5 C–D, 7A). PPRCL/ Ch 1L= 2/1.

Thorax: Chaetiger 1= Notopodia: two groups of 6 elongate, narrowly hooded chaetae ( Figures 6 A, 7B). Chaetigers 2 to 8= Notopodia: SG= 2 rows of 6 elongate, narrowly hooded chaetae ( Figures 6 B–C, 7D); IG= 1 anterior row with 6 short bayonet chaetae ( Figures 6 D, 7D), 2 posterior rows with 6–7 symmetrical, paleate chaetae with short mucro ( Figures 6 E, 7D). Neuropodia: 1 row of 10­16 acicular uncini per torus, MF= 3, covering three quarters of the MF length, teeth above MF unequal in size, basal tooth bigger than teeth in distal row, hood present, handles long ( Figures 6 F–G). GR2= broad, of same width around the segment ( Figures 5 B–D).

Abdomen: AS = 52 (42–53). Anterior segments: 2 transverse rows of 8 elongate, narrowly hooded chaetae ( Figures 6 H–I), chaetae from the upper row 50% shorter than chaetae in lower row; 20–23 uncini per torus, MF= 6, covering one half of the MF length, teeth above MF equal in size, breast sub­rectangular, well developed, main fang not extending beyond breast, handles absent ( Figures 6 K–L). Posterior segments: 4–5 modified, elongate, narrowly hooded chaetae ( Figure 6 J), 25% longer than in anterior segments ( Figure 7 C); 15–17 modified uncini per torus, MF= 7–8, covering three quarters of the MF length ( Figure 7 E), teeth above MF equal in size, breast rectangular, poorly developed, main fang extending beyond breast, handles absent ( Figures 6 M– O). Pygidium digitiform, without cirrus ( Figures 5 G, 7C).

Gametes: Not observed in type material, mature females from Lake Worth (UMML) with oocytes of similar size in abdomen.

MGS: Ventral shield of collar with uniform pattern, except for the distal end. Dorsally, each segment is divided by 2 dark rectangles, except for the faecal groove. Solid­colored ventrally, uniform, except for intersegmental lines and pre and post­chaetal lobes. Pygidium remains darker for several days.

Remarks: Chone farringtonae sp. nov. as well as the other species herein described, has modified, posterior abdominal Amphicorina ­ type uncini; however, C. farringtonae is unique in having posterior abdominal uncini with the main fang extending beyond breast, in comparison with all other species in which the main fang does not extend beyond breast ( Table 1).

Chone aurantiaca ( Johnson, 1901) described from Port Orchard, Puget Sound (MCZ 1933, holotype), Chone magna ( Moore, 1923) from San Miguel, California (USNM 17281, holotype) and C. farringtonae sp. nov. have the posterior peristomial ring collar length twice as long as the first chaetiger. However, Chone farringtonae can be distinguished by having ventral shield of collar two times longer than wide (as long as wide in C. aurantiaca and C. magna ), medium­sized radiolar tips (short in C. aurantiaca , long in C. magna ), and posterior abdominal chaetiger with Amphicorina ­ type uncini (absent in C. aurantiaca and C. magna ).

Etymology: This species is named in honor of Sandra Farrington in recognition of her work and dedication in the Invertebrate Collection of the Fish and Wildlife Research Institute, St. Petersburg, Florida.

Figures

FIGURE 5. Chone farringtonae sp. nov. A) Whole worm, ventro­lateral view, B) anterior end, dorsal view, C) anterior end, lateral view, D) anterior end, ventral view, E) thoracic segment, F) radiolar tip, lateral radiole, G) posterior end of the body, lateral view. A – G) Holotype FSBC I 66733. vsc = ventral shield of collar.

FIGURE 6. Chone farringtonae sp. nov. A) Elongate, narrowly hooded chaeta, collar, B – C) thoracic, elongate, narrowly hooded chaetae, D) bayonet chaeta, E) paleate chaetae, F – G) thoracic acicular uncinus, H – I) abdominal, elongate, narrowly hooded chaetae, J) abdominal, modified, elongate, narrowly hooded chaeta, last chaetiger, K – L) uncini, anterior abdominal segment, M – O) uncini, last abdominal tori. A – O) Holotype FSBC I 66733. h: hood.

FIGURE 7. Chone farringtonae sp. nov. A) Anterior end, lateral view, B) anterior end, dorsal view, C) posterior end, ventral view, D) thoracic chaetiger, E) uncini, posterior abdominal segment. A – E) FSBC I 66734. Scale bars (A) 200 µm, (B – C) 100 µm, (D) 10 µm, (E) 5 µm.