Chone orensanzi , Tovar-Hernández, María Ana, León-González, Jesús Ángel De & Bybee, David R., 2017

Tovar-Hernández, María Ana, León-González, Jesús Ángel De & Bybee, David R., 2017, Sabellid worms from the Patagonian Shelf and Humboldt Current System (Annelida, Sabellidae): Phyllis Knight-Jones’ and José María Orensanz’s collections, Zootaxa 4283 (1), pp. 1-64: 8-12

publication ID

10.5281/zenodo.828032

publication LSID

lsid:zoobank.org:pub:E62F2AD9-112F-40F0-B8E4-6FF79D27C8B2

persistent identifier

http://treatment.plazi.org/id/EE3E87C6-FFAC-A340-FF7F-DA39FC385ED3

treatment provided by

Plazi

scientific name

Chone orensanzi
status

sp. nov.

Chone orensanzi  sp. nov.

( Figs 2View FIGURE 2, 3View FIGURE 3, 31View FIGURE 31 A)

Material examined. Type material: Holotype, UANL 8007; 38 paratypes, UANLAbout UANL 8008View Materials, ARGENTINA, Campaña SAOAbout SAO I, Golfo de San Matías , St. 23, 40°57’S, 65°05’W, 12.5 m depth, 17 February 1971, coll. J.M. Orensanz. Additional materialGoogleMaps  : ARGENTINA, Campaña SANJO II  , UANLAbout UANL 8009View Materials: Golfo de San José, off El Riacho , subtidal, 42°24’S, 64°35’W, May 1976, coll. J.M. Orensanz, 2 specimens in symbiosis with copepods; Campaña SAOAbout SAO IGoogleMaps  , UANLAbout UANL 8010, 40 °48’S (number station and longitude coordinates lost), 4 km off Las Grutas , 10 m depth, sand, 9 February 1971, 30 specimens  ; UANL 8011: St. 22, 40°54’S, 65°01’W, 16 m depth, gravel, 11 February 1971, coll. J.M. Orensanz, 50 specimens; UANL 8012: St. 24, 41°02’S, 65°08’30”W, 15 m depth, shell, 11 February 1971, coll. J.M. Orensanz, 4 specimens; UANL 8013: St. 26, 41°05’30”S, 65°08’30”W, 16.5 m depth, sand, 11 February 1971, coll. J.M. Orensanz, 10 specimens; UANLAbout UANL 8014View Materials: Golfo de San Matías , St. 3, 40°53’S, 64°43’W, 17.5 m depth, sand, 14 February 1971, coll. J.M. Orensanz, 1 specimenGoogleMaps  ; UANL 8015: St. 5, 40°54’S, 64°31’W, 20–24 m depth, sand, 14 February 1971, coll. J.M. Orensanz, 4 specimens; UANL 8016: St. 15, 41°01’S, 64°15’W, 33–36 m depth sand & mud, 15 February 1971, coll. J.M. Orensanz, 1 specimen; UANL 8017: St. 53, 41°00’S, 65°06’W, 38 m depth, gravel & shell, 17 February 1971, coll. J.M. Orensanz, 2 specimens; UANL 8018: St. 54, 40°57’S, 65°03’W, 41.5 m depth, 17 February 1971, coll. J.M. Orensanz, 1 specimen. Campaña SAOAbout SAO II  , UANLAbout UANL 8019View Materials: Golfo de San Matías , St. 54, 40°57’S, 65°03’W, 41.5 m depth, 17 February 1971, 2 specimensGoogleMaps  . Campaña SAOAbout SAO V  , UANLAbout UANL 8020View Materials: Golfo de San Matías, St. 226, 40°53’S (longitude coordinates lost), 1 km off beach S of Bajo Oliveira , 20 m depth, 5 March 1973, coll. J.M. Orensanz, 1 specimen  ; UANLAbout UANL 8021View Materials: St. 228, 40°53’S (longitude coordinates lost), slightly S of Bajo Oliveira , 21 m depth, coarse sand & gravel, 5 March 1973, coll. J.M. Orensanz, 1 specimen  ; UANLAbout UANL 8022View Materials: St. 236, 40°53’S (longitude coordinates lost), off El Buque , 20 m depth, shell, 6 March 1973, coll. J.M. Orensanz, 1 specimen  ; UANLAbout UANL 8023View Materials: St. 240, 40°53’S, 64°55’W, between Bancos Paliza and Lobos, 18 m depth, 6 March 1973, coll. J.M. Orensanz, 6 specimensGoogleMaps  ; UANL 8024: St. B, 40°47’S, 64°53’W, depth missing, N of Punta Villarino, at anchor (no date), coll. J.M. Orensanz, 5 specimens. Campaña COMP II  , UANLAbout UANL 8025View Materials: Santa Clara del Mar , St. 7, 37°50’S, 57°24’W, 2 August 1963, 72.19 m depth, medium-fine sand, 108 specimensGoogleMaps  . Campaña COMP V  , UANL 8026: St. 72, 38°18’S, 57°45’W, 25 m depth, medium sand, 27 May 1964, 3 specimens; UANLAbout UANL 8027View Materials: inner shelf off Mar del Plata , St. 81, 37°42’S, 57°17’W, 28 May 1964, 19 m depth, fine, medium & coarse sand, 2 specimens. Campaña Almirante SaldanhaGoogleMaps  , UANL 8028: St. 2262a, 36°24’S, 55°00’W, 47 m depth, 9 November 1969, 1 specimen; UANL 8029: St. 2287a, 38°05’S, 56°43.5’W, 67 m depth, 16 November 1969, 2 specimens; UANLAbout UANL 8030View Materials: Isla Jabalí, Bahía San Blas, 40°34’ 50”S, 62°10’ 35”W, intertidal, April 1970, coll. J.M. Orensanz, A. Escofet & M.C. Estivariz, 3 specimensGoogleMaps  ; UANLAbout UANL 8031View Materials, Bahía San Blas, 40°33’S, 62°14’W, March 1970, intertidal, 5 specimensGoogleMaps  . Campaña MEJILLON I  , UANLAbout UANL 8032View Materials: Provincia de Buenos Aires, St. 11, 37°30’S, 56°33’W, 47 m depth, mud, 10 November 1971, 1 specimenGoogleMaps  ; UANL 8033: St. 13, 37°20’S, 56°22’W, 47 m depth, mud, 10 November 1971, 1 specimen; UANL 8034: St. 15 bis, 37°10’S, 56°15’W, 28 m depth, sand, 10 November 1971, 2 specimens; UANL 8035: St. 18, 37°16’S, 56°06’W, 48 m depth, mud, 11 November 1971, 1 specimen; UANLAbout UANL 8036View Materials: Golfo San Matías, Las Grutas , 40°48’S, 65°05’W, intertidal, sheltered sandy beach, February 1972, 1 specimenGoogleMaps  . URUGUAY, Campaña Akademik Knipovich, UANL 8037: St. 250, 34°51’S, 52°35’W, 83 m depth, 1965, coll. V.N. Semenova & V. Scarabino, 20 specimens; UANL 8038: St. 1059, 35°25.9’S, 53°27.9’W, 80– 72 m depth, 1967, coll. V.N. Semenova & V. Scarabino, 1 specimen; UANL 8039: St. 1068, 34°15’S, 52°12’W, 55–62 m depth, 1967, coll. V.N. Semenova & V. Scarabino, 1 specimen; UANL 8040: St. 1071, 34°22.9’S, 52°37.2’W, 36– 42 m depth, 1967, coll. V.N. Semenova & V. Scarabino, 2 specimens.

Description. Trunk length 23 mm (4.7– 17 mm), width 2.3 mm (0.5– 2 mm). Branchial crown length 9 mm (2– 8 mm), with 15 pairs of radioles (8–16 pairs) ( Fig. 2View FIGURE 2 B). Eight thoracic and 42 (36–39) abdominal segments. Attachment of branchial crown not exposed beyond collar. Palmate membrane extending for about 3/4 length of branchial crown ( Fig. 3View FIGURE 3 A). Lateral flanges broad ( Fig. 3View FIGURE 3 A). Radiolar tips long, filiform (space of 20 pinnules) ( Fig. 3View FIGURE 3 B). Dorsal lips broadly rounded basally with a straight, radiolar appendage ( Fig. 3View FIGURE 3 D). Ventral lips rounded, small. Three to four pairs of ventral radiolar appendages of different lengths, all shorter than branchial crown length ( Fig. 3View FIGURE 3 D); 3 basal pinnules from dorsal most radioles long and fused by membrane. Ventral anterior peristomial ring lobe exposed beyond collar, distally entire, triangular. Antero-dorsal, ventral and lateral collar margins entire, ventral margin higher than dorsal ( Fig. 2View FIGURE 2 C). Entire lengths of mid-dorsal collar margins form narrow gap ( Fig. 2View FIGURE 2 D). Dorsal pockets well developed. Ventral shield of chaetiger 1 horseshoe-shaped, swollen ( Fig. 2View FIGURE 2 E). Ratio of posterior peristomial ring collar length versus chaetiger 2 length, in lateral view: 1.5:1 ( Fig. 2View FIGURE 2 C). Trunk cylindrical ( Fig. 2View FIGURE 2 A). Thoracic chaetigers 2 to 8: Notopodia: superior group with two irregular rows of elongate narrowly hooded chaetae; inferior group with one anterior row of bayonet chaetae; two posterior rows with paleate chaetae with short mucros ( Fig. 3View FIGURE 3 E). Neuropodia: acicular uncini handles as long as 10 times length of main fang ( Fig. 3View FIGURE 3 F), distributed as regular row, dentition covering half length of main fang ( Fig. 3View FIGURE 3 G), hood present. Glandular ridge on chaetiger 2 narrow all around ( Fig. 2View FIGURE 2 C–E). Anterior abdominal segments: two transverse rows of elongate, narrowly hooded neurochaetae, upper row chaetae half as long as lower row ones; uncini (notochaeta) with dentition occupying half of main fang length, main fang not extending beyond breast. Posterior segments slightly depressed dorsoventrally containing: very elongate, narrowly hooded neurochaetae, 25% longer than those of anterior segments; uncini (notochaeta) rasp-shaped plates with square breast ( Fig. 3View FIGURE 3 H). Pygidium triangular ( Fig. 2View FIGURE 2 F), without cirrus.

Methyl green staining. Epidermis is completely glandular and stains uniformly in thorax and abdomen, dorsally and ventrally, except for anterior collar margin ( Fig. 2View FIGURE 2 C–E). Anterior end of first ventral glandular shield does not take up stain, lateral sides of collar ventral shield dark ( Fig. 2View FIGURE 2 C).

Type locality. Golfo de San Matías, Argentina, 40°57’S, 65°05’W.GoogleMaps 

Etymology. This species is dedicated to José María ‘Lobo’ Orensanz in recognition of his many publications on polychaetes, his remarkable contribution to fisheries, and for his interest and encouragement of those studying the Sabellidae  from South America.

Remarks. As stated above only three species of Chone  have been described from South America: C. insularis  from Ilha Grande, Brazil, by Nonato (1981), and C. rosea  and C. striata  , which were both described from off South Chile by Hartmann-Schröder (1965). Chone orensanzi  sp. nov., differs from C. insularis  and C. striata  by having a collar segment as long as 1.5 thoracic segments whereas in C. insularis  and C. striata  it is as long as three thoracic segments. In C. orensanzi  sp. nov., the anterior margin of the peristomial ring lobe is exposed beyond the collar margin whereas in C. rosea  and C. striata  it is covered by the collar. Chone rosea  has the ventral shield of chaetiger 1 sun glasses-shaped (horseshoe-shaped in C. orensanzi  sp. nov., and C. striata  ) and extra-long radiolar tips (as opposed to long in C. orensanzi  sp. nov., and short in C. striata  ) ( Table 1).

Chone mollis (Bush in Moore, 1904)  , a species distributed from California, Western Mexico and Panama, has the anterior peristomial ring lobe exposed beyond the collar, distally entire, and triangular, similar to C. orensanzi  sp. nov. However, in C. mollis  paleate chaetae have a minute mucro (hair-like), not easily discernible, whereas in C. orensanzi  sp. nov., it is well developed and easily seen. In addition, the handles of thoracic uncini in C. orensanzi  sp. nov., are extremely long (more than 10 times length of main fang) versus 7 times the length of the main fang in C. mollis  .

Augener (1931) reported C. infundibuliformis Krøyer, 1856  , from between the Rio Grande and the mouth of La Plata River, but figures and diagnostic features were not included to confirm that his specimens belong in fact to C. infundibuliformis  , which is an Arctic-Boreal species. Based on the redescription of C. infundibuliformis  by Tovar-Hernández & Sosa-Rodríguez (2006), it is different from C. orensanzi  sp. nov., by having short radiolar tips (long in C. orensanzi  sp. nov.) and an anterior peristomial ring lobe that is not exposed beyond the collar (exposed in C. orensanzi  sp. nov.).

Elías et al. (2001) reported Chone  sp. cf. C. duneri  from Mar del Plata, on shore, subtidal (ecological survey). Chone duneri Malmgren, 1867  , is restricted to the Arctic Seas and North Atlantic Ocean (Tovar-Hernández et al. 2007), and it is easily distinguished from C. orensanzi  sp. nov., by the presence of a bifid anterior peristomial ring lobe (entire in C. orensanzi  sp. nov.).

Chone orensanzi  sp. nov., is unique among Chone  species in having a set of distinguishable features: 1) the anterior peristomial ring lobe is triangular, exposed beyond the collar, 2) a short collar (as long as 1.5 times the length of chaetiger 2), 3) ventral shield of chaetiger 1 horse-shoe shaped, 4) radiolar flanges broad, 5) radiolar tips long, filiform and 6) thoracic uncini as long as 10 times the lengths of main fangs. In addition, branchial crowns of two large specimens (body lengths 12–17 mm; branchial crown lengths 4.5– 8 mm) from lot UANLAbout UANL 8009 were found infested with copepods ( Fig. 3View FIGURE 3 C) but the identity of these parasites remains unknown. Members of three families of copepods are typically external parasites of sabellids: Gastrodelphyidae  , Sabelliphilidae  and Rhynchomolgidae  . Many species of these copepod families have been reported on sabellids of the genera Eudistylia  , Acromegalomma  , Parasabella  , Pseudopotamilla  , Bispira  , Myxicola  , Potamilla  , Perkinsiana  and Sabella  ( Capa et al. 2014 and references therein), but none on members of Chone  .

Remarks. Jasmineira  is composed of 17 species ( Fitzhugh 2002; Capa & Murray 2015). None of these was described from South America but four species have been described from Antarctica  : J. crumenifera  Hartmann- Schröder, 1986, from South Shetlands, 488 m depth; J. caeca Ehlers, 1913  , and J. macrophthalma Ehlers, 1913  , both from Kerguelen Islands (Observatory Bai), and J. regularis Hartman, 1978  , from the Weddell Sea, 512–2936 m depth. In this study, we report J. crumenifera  from the Uruguayan shelf.

UANL

Universidad Autonoma de Nuevo Leon

SAO

Sammlung Oberli

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Sabellidae

Genus

Chone