Chone johnstonae, 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: 18-21

publication ID

http://doi.org/ 10.5281/zenodo.170270

publication LSID

lsid:zoobank.org:pub:03DFC50B-6138-48C0-A587-89A9C1071436

DOI

http://doi.org/10.5281/zenodo.3508379

persistent identifier

http://treatment.plazi.org/id/B33D879C-6676-7B6E-FEBB-F6E8B08EFC8F

treatment provided by

Plazi

scientific name

Chone johnstonae
status

sp. nov.

Chone johnstonae   sp. nov.

Figures 8 View FIGURE 8 A –I, 9 A –N

Material examined

Type material: Holotype [ FSBC I 66736 View Materials ], Paratype [ FSBC I 66737 View Materials ] (1): Turpialito, Cumaná, Venezuela, Coll. M. Liñero, February 22, 2002, 4 m.

Non­type material: Venezuela: [ECOSUR] Los Testigos, Isla Margarita, 20 m, June 10, 1961 (1). Golfo de Santa Fe, Coll. O. Díaz, June 19, 2004 (2). Ensenada de José, Coll. O. Díaz, July 20, 1997 (1).

Additional material: Chone letterstedti ( Kinberg, 1867)   . Holotype [ SMNH 576] Cape of Good Hope, South Africa.

Description (inside parentheses variation observed in paratype and non­type material, respectively)

Color, body shape and size: Body pale in preserved material; cylindrical in thorax and anterior part of abdomen ( Figure 9 View FIGURE 9 A); depressed in posterior part of abdomen; BoL= 10 mm (8.5– 20), W= 1.5 mm (2).

Branchial crown: BrCL= 3.7 mm (8), RML/BrCL= 0.75/ 1. Radioles: 11 (13) pairs, narrow flanges ( Figures 8 View FIGURE 8 E, I), pinnules long, of similar length throughout radiole, RT= medium­sized [9 pinnules] ( Figures 8 View FIGURE 8 E, I). Radiolar skeleton composed of 2 rows of cells ( Figure 8 View FIGURE 8 H), continued into pinnules. BrL= small, insertion not exposed beyond collar ( Figures 8 View FIGURE 8 A –C). DL= 3 times longer than wide, without a discernable longitudinal ridge ( Figures 8 View FIGURE 8 F –G). VL= rounded, as long as wide, about one half of the DL length. VRA= 4 pairs, the inner one about one quarter of the BrCL, medium about one half of the BrCL, the distal one about the same length of the BrCL, the remainder about one half of the BrCL ( Figure 8 View FIGURE 8 F). Lateral radioles are parasitised by an unidentified copepod ( Figure 8 View FIGURE 8 H).

Peristomium   : APRL = not exposed beyond collar, ventral margin distally entire, triangular. PPRC = antero­dorsal, lateral and ventral collar margins entire, slightly high ventrally ( Figures 8 View FIGURE 8 A –C). VSC= swollen, horseshoe­shaped, 2 times wider than long ( Figure 8 View FIGURE 8 A). PPRCL / Ch 1 L= 1 / 1.

Thorax: Chaetiger 1 = Notopodia: two groups of 5 elongate, narrowly hooded chaetae. Chaetigers 2 to 8 = Notopodia: SG= 5 elongate, narrowly hooded chaetae ( Figure 9 View FIGURE 9 A), IG= 1 anterior row with 6 short bayonet chaetae ( Figures 9 View FIGURE 9 A, F), 2 posterior rows with 6–7 symmetrical, paleate chaetae with short mucro ( Figures 9 View FIGURE 9 A, B –E). Neuropodia: 1 row of 10­14 acicular uncini per torus, MF= 4, covering three quarters of the MF length, teeth above MF unequal in size, basal tooth bigger than teeth in distal rows, hood present, handles long ( Figures 9 View FIGURE 9 G –H). GR 2 = narrow, of same width around the segment.

Abdomen: AS = 29. Anterior segments: 2 transverse rows of 8–9 elongate, narrowly hooded chaetae ( Figures 9 View FIGURE 9 I –J), chaetae from the upper row 50 % shorter than chaetae in lower row; 13–16 uncini per torus ( Figure 9 View FIGURE 9 L), MF= 2–3, 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 9 View FIGURE 9 M). Posterior segments: 5 modified, elongate, narrowly hooded chaetae ( Figure 9 View FIGURE 9 K); 4–6 modified uncini per torus, MF= 7–8, covering three quarters of the MF length, teeth above MF equal in size, breast rectangular, poorly developed, main fang not extending beyond breast, handles absent ( Figure 9 View FIGURE 9 N). Pygidium subtriangular, without cirrus ( Figure 8 View FIGURE 8 D).

Gametes: Paratype female with oocytes in segment 5 ( Figure 9 View FIGURE 9 A). Specimen from Isla Margarita with sperm in abdomen having rectangular nucleus, heads trapezium­shaped, and two rounded mitochondria.

MGS: Ventral shield of collar in solid­color, except for the distal end. Segments divided by 2 dark rectangles dorsally, except for the faecal groove. Color uniform ventrally, except for intersegmental lines and pre and post­chaetal lobes.

Remarks: Chone johnstonae   sp. nov. and C. diazi   sp. nov. are described from Venezuelan waters. The two species have medium­sized radiolar tips, but in C. johnstonae   radioles bear narrow flanges (broad in C. diazi   ), and the anterior peristomial ring lobe and branchial lobes are not exposed beyond the collar (exposed in C. diazi   ). Chone letterstedti ( Kinberg, 1867)   described from Cape of Good Hope, South Africa ( SMNH 576, holotype) and Chone reayi McIntosh, 1916   from Ireland are similar to C. johnstonae   in that the entire length of the mid­dorsal collar margins forms a broad gap; however, C. letterstedti   and C. reayi   have the posterior peristomial ring collar length 1.5 times longer than the first chaetiger (as long as first chaetiger in C. johnstonae   ); C. johnstonae   has paleate chaetae with short­sized mucro (medium­sized mucro in C. letterstedti   and C. reayi   ); C. letterstedti   have short radiolar tips (medium­sized in C. johnstonae   and C. reayi   ); and broad radiolar flanges (narrow in C. johnstonae   and C. reayi   ).

Etymology: This species is named after Ardis Johnston in recognition of her work and efforts in the collection of the Museum of Comparative Zoology ( MCZ), Harvard University, and for the warm support and assistance during my stay in that institution.

SMNH

Saskatchewan Museum of Natural History

MCZ

Museum of Comparative Zoology

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Sabellidae

Genus

Chone