Chone uebelackerae, 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 : 25-28

Chone uebelackerae sp. nov.

Figure 12 A– O, 13A–D

Chone sp. A Uebelacker, 1984: 54 –14, 54–17, Fig. 54–9, 10 a–m.

Material examined

Type material: Holotype [ FSBC I 34707] EJ73430: St. Lucie County, Hutchinson Island, East of F. P. & L. Electrical generating plant, 27° 22’ 08’’ N, 80° 13’ 46’’ W, 9.7 m. Paratypes: [ FSBC I 34709] EJ72125 (1), St. Lucie County, Hutchinson Island, East of F. P. & L. Electrical generating plant, 27° 22’ 08’’ N, 80° 13’ 46’’ W, 10.3 m. [ FSBC I 34699] EJ71417, 27 ° 21’ 23’’ N, 80° 13’ 24’’ W, 11.2 m (1). [ FSBC I 34694] EJ71428, 27 ° 22’ 08’’ N, 80° 13’ 46’’ W, 11.2 m (1 mounted in gold for SEM). [ FSBC I 34701] EJ71429, 27 ° 22’ 08’’ N, 80° 13’ 46’’ W, 11.2 m (1). [ FSBC I 3470] EJ71430 (1), 27° 22’ 08’’ N, 80° 13’ 46’’ W, 11.2 m (1). [ FSBC I 34702] EJ71450, 27 ° 22’ 08’’ N, 80° 13’ 06’’ W, 10.9 m (3). [ FSBC I 34697] EJ72154, 27 ° 22’ 08’’ N, 80° 13’ 46’’ W, 10.9 m (1). [ FSBC I 34695] EJ72164, 27 ° 21’ 23’’ N, 80° 13’ 24’’ W, 11.2 m (1). [ FSBC I 34705] EJ72167, 27 ° 21’ 23’’ N, 80° 13’ 24’’ W, 11.2 m (2). [ FSBC I 34698] EJ72177, 27 ° 20’ 24’’ N, 80° 13’ 04’’ W, 10.3 m (1). [ FSBC I 34700] EJ72178, 27 ° 20’ 24’’ N, 80° 13’ 04’’ W, 10.3 m (1). [ FSBC I 34711] EJ72182, 27 ° 22’ 08’’ N, 80° 13’ 46’’ W, 11.8 m (5). [ FSBC I 34703] EJ72184, 27 ° 22’ 08’’ N, 80° 13’ 46’’ W, 11.8 m (1). [ FSBC I 34696] EJ72193, 27 ° 21’ 23’’ N, 80° 13’ 24’’ W, 10.9 m (1). [ FSBC I 34710] EJ73412, 27 ° 21’ 23’’ N, 80° 13’ 24’’ W, 10 m (1). [ FSBC I 34708] EJ73432, 27 ° 22’ 08’’ N, 80° 13’ 46’’ W, 9.7 m (3, 1 mounted in gold for SEM).

Non­type materials: Western Florida [ USNM 90373] MAFLA, Sta. IV–2423, Apachicola River, 29° 37’ 01’’ N, 84° 17’ 00’’ W, Coll. BLM, August 1977, 19 m (1). [ USNM 90374] MAFLA, Sta. II–2211, Off St. Petersburg, 27° 56’ 30’’ N, 83° 53’ 00’’ W, Coll. BLM, August 1977, Sta. 112211, 43 m (2). Texas [ USNM 90370] Hospital Rock, STOCS, Sta. HR1, 27 ° 32’ 05’’ N, 96° 28’ 19’’ W, Coll. BLM, July 1976, Sta. HR 1, 75 m (2). [ USNM 90371] STOCS, Sta. HR1, 27 ° 32’ 05’’ N, 96° 28’ 19’’ W, Coll. BLM, March 1976, Sta. HR1, 75 M, Acc. 340739 (1). [ USNM 90378] STOCS, Sta. HR1, 27 ° 32’ 05’’ N, 96° 28’ 19’’ W, Coll. BLM, March 76, HR 1, 75 m, Acc. 370439 (1). [ USNM 90379] STOCS, Sta. HR1, 27 ° 32’ 05’’ N, 96° 28’ 19’’ W, Coll. BLM, March 1976, Sta. HR 1, 75 m, Acc. 340739 (3). [ USNM 90381] STOCS, Sta. HR1, 27 ° 32’ 05’’ N, 96° 28’ 19’’ W, Coll. BLM, November 1976, Sta. HR 1, 75 m (1). [ USNM 90382] STOCS, Sta. HR1, 27 ° 32’ 05’’ N, 96° 28’ 19’’ W, Coll. BLM, Nov. 1976, Sta. HR 1, 75 m (3). [ USNM 90376] STOCS, Sta. SB3, Southern Bank Texas, 27° 26’ 06’’ N, 96° 31’ 47’’ W, Coll. BLM, August 1976, Sta. S 133, 82 m (4).

Description (in parenthesis variation of paratypes)

Color, body shape and size: Body pale in preserved material; cylindrical in thorax and anterior part of abdomen, depressed in posterior part of abdomen ( Figures 12 A, 13A); BoL= 4.75 mm (6), W= 1 mm (1.25).

Branchial crown: BrCL= 3.5 mm, RML/BrCL= 0.75/1 ( Figure 13 B). Radioles: 9 (8–9) pairs, broad flanges, pinnules long with similar length throughout radiole, RT= longsized [14 pinnules] ( Figures 12 D–E, 13B). BrL= small, not exposed beyond collar ( Figure 13 B). DL= 3 times longer than wide, without a discernable longitudinal ridge ( Figure 12 G). DRA= 3 pairs, united by a membrane ( Figure 12 F). VL= rounded, as longer than wide, about three quarters of DL length ( Figure 12 G). VRA= 4 pairs, the inner one about one quarter of the BrCL, others about one half of the BrCL ( Figures 12 F, 13B).

Peristomium : APRL= not exposed beyond collar, ventral margin distally entire, long, triangular ( Figures 12 A–B, 13B). PPRC= antero­dorsal, lateral and ventral collar margins entire, ventral slightly higher than dorsal ( Figure 12 A–C), longitudinal grooves in lateral sides, dorso­lateral pockets well developed. VSC= swollen, horseshoe­shaped, 2 times wider than long ( Figure 12 A). PPRCL/ Ch 1L= 1.5/1.

Thorax: Chaetiger 1= Notopodia: two groups of 4–6 elongate, narrowly hooded chaetae. Chaetigers 2 to 8= Notopodia: SG= 2 rows of 5–6 elongate, narrowly hooded chaetae; IG= 1 anterior row with 5 short bayonet chaetae ( Figure 12 J), 2 posterior rows with 6 symmetrical, paleate chaetae with short mucro ( Figure 12 K–L). Neuropodia: 1 row of 8–20 acicular uncini per torus, MF= 4, covering one half of the MF length ( Figure 13 C), teeth above MF unequal in size, basal tooth bigger than teeth in distal rows, hood present ( Figure 12 M), handles long. GR2= narrow, of same width around the segment.

Abdomen: AS = 33 (29). Anterior segments: 2 transverse rows of 8 elongate, narrowly hooded chaetae, chaetae from the upper row 50% shorter than chaetae in lower row; 12 uncini per torus, MF= 4, covering one half of the MF length, teeth above MF equal in size, breast rectangular, well developed, main fang not extending beyond breast, handles absent ( Figure 12 I). Posterior segments: 2–3 modified, elongate, narrowly hooded chaetae, 25% longer than in anterior segments; 5–9 modified uncini per torus, MF= 7, covering three quarters of the MF length ( Figure 13 D), teeth above MF equal in size, breast rectangular, poorly developed, main fang not extending beyond breast, handles absent ( Figures 12 N– O). Pygidium triangular, depressed ( Figures 12 A, H).

Gametes: Females with oocytes of different size in abdomen.

MGS: Solid color on ventral shield of collar, except the distal end. Dorsal and ventrally, body stains uniformly, except intersegmental lines and pre and post­chaetal lobes.

Remarks: Chone uebelackerae sp. nov., C. americana and C. magna ( Moore, 1923) are similar in having long radiolar tips; however, they differ because C. uebelackerae sp.

nov. and C. magna lack pygidial cirri (present in C. americana ); radiolar membrane extends three quarters of the branchial crown length (one half in C. americana ); flanges are broad (narrow in C. americana and C. magna ); the posterior peristomial ring collar length is 1.5 times as long as the first chaetiger (2 times longer in C. magna ); and uncini from posterior abdominal segments are Amphicorina ­ type (absent in C. magna ).

Etymology: This species is named after Joan Uebelacker who first identified part of the materials herein included as a possible new species, and for her many contributions for the Taxonomic Atlas of the Gulf of Mexico polychaetes.

Figures

FIGURE 12. Chone uebelackerae sp. nov. A) Whole worm, ventro­lateral view, B) anterior end, dorsal view, C) anterior end, lateral view, D – E) radiolar tips, lateral radioles, F) ventral radiolar appendages, G) dorsal radiolar appendages, H) pygidium, ventral view, I) uncinus, anterior abdominal segment, J) bayonet chaeta, segment 5, K – L) paleate chaetae, M) thoracic acicular uncinus, N – O) uncini, last abdominal tori. A – E, H) Holotype FSBC I 34707, F – G) USNM 0 90379, I – O) Paratype FSBC I 34709. h: hood.

FIGURE 13. Chone uebelackerae sp. nov. A) Whole worm, ventro­lateral view, B) branchial crown, ventral view, C) thoracic uncini, D) uncini, posterior abdominal segment. FSBC I 34709. Scale bars (A) 500 µm, (B) 200 µm, (C – D) 5 µm.