Chone johnstonae Tovar-Hernández, 2005, sp. nov.
Creators
Description
Chone johnstonae sp. nov.
Figures 8 A–I, 9A–N
Material examined
Type material: Holotype [FSBC I 66736], Paratype [FSBC I 66737] (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 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 E, I), pinnules long, of similar length throughout radiole, RT= mediumsized [9 pinnules] (Figures 8 E, I). Radiolar skeleton composed of 2 rows of cells (Figure 8 H), continued into pinnules. BrL= small, insertion not exposed beyond collar (Figures 8 A–C). DL= 3 times longer than wide, without a discernable longitudinal ridge (Figures 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 F). Lateral radioles are parasitised by an unidentified copepod (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 A–C). VSC= swollen, horseshoeshaped, 2 times wider than long (Figure 8 A). PPRCL/ Ch 1L= 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 A), IG= 1 anterior row with 6 short bayonet chaetae (Figures 9 A, F), 2 posterior rows with 6–7 symmetrical, paleate chaetae with short mucro (Figures 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 G–H). GR2= narrow, of same width around the segment.
Abdomen: AS = 29. Anterior segments: 2 transverse rows of 8–9 elongate, narrowly hooded chaetae (Figures 9 I–J), chaetae from the upper row 50% shorter than chaetae in lower row; 13–16 uncini per torus (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 M). Posterior segments: 5 modified, elongate, narrowly hooded chaetae (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 N). Pygidium subtriangular, without cirrus (Figure 8 D).
Gametes: Paratype female with oocytes in segment 5 (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.
Other
Published as part of Tovar-Hernández, María Ana, 2005, Redescription of Chone americana Day, 1973 (Polychaeta: Sabellidae) and description of five new species from the Grand Caribbean Region, pp. 1-30 in Zootaxa 1070 on pages 18-21, DOI: 10.5281/zenodo.170270Files
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Linked records
Additional details
Identifiers
Related works
- Cites
- Figure: 10.5281/zenodo.170276 (DOI)
- Figure: 10.5281/zenodo.170277 (DOI)
- Is part of
- Journal article: 10.5281/zenodo.170270 (DOI)
- Journal article: http://publication.plazi.org/id/4F04FFE466677B7AFFB3F70CB47DFFE9 (URL)
- Is source of
- https://sibils.text-analytics.ch/search/collections/plazi/B33D879C66767B6EFEBBF6E8B08EFC8F (URL)
Biodiversity
- Family
- Sabellidae
- Genus
- Chone
- Kingdom
- Animalia
- Order
- Sabellida
- Phylum
- Annelida
- Species
- johnstonae
- Taxonomic status
- sp. nov.
- Taxon rank
- species
- Taxonomic concept label
- Chone johnstonae Tovar-Hernández, 2005
References
- Kinberg, J. G. H. (1867) Annulata nova. Ofversigt af Koniglich Vetenskapsakademiens forhandlingar, Stockholm, 23, 9, 337 - 357.
- McIntosh, W. C. (1916) Notes from the Gatty Marine Laboratory, St. Andrews, 38. 1. On the British Sabellidae. 2. On the Sabellidae dredged by H. M. S. ' Porcupine' in 1869 and 1870, and by H. M. S. ' Knight Errant' in 1882. 3. On the Terebellidae and Sabellidae dredged in the Gulf of St. Lawrence, Canada by Dr. Whiteaves in 1871 - 73. 4. On the Sabellidae dredged by Canon A. M. Norman in Norway and Finmark. Annals and Magazine of Natural History, 17, 1 - 66.