Sabellid worms from the Patagonian Shelf and Humboldt Current System (Annelida, Sabellidae): Phyllis Knight-Jones’ and José María Orensanz’s collections Tovar-Hernández, María Ana León-González, Jesús Ángel De Bybee, David R. Zootaxa 2017 4283 1 1 64 5YBHV [151,355,1367,1393] Polychaeta Sabellidae Chone Animalia Sabellida 7 8 Annelida species orensanzi sp. nov.   Material examined. Type material: Holotype, UANL 8007; 38 paratypes,   UANL8008, ARGENTINA, Campaña SAOI,  Golfo de San Matías, St. 23, 40°57’S, 65°05’W, 12.5 m depth,  17 February 1971, coll. J.M. Orensanz. Additional material:  ARGENTINA, Campaña SANJOII,   UANL8009: Golfo de San José, off  El Riacho, subtidal, 42°24’S, 64°35’W,  May 1976, coll. J.M. Orensanz, 2 specimensin symbiosis with copepods; Campaña SAOI,   UANL8010, 40°48’S (number station and longitude coordinates lost), 4 kmoff Las Grutas,  10 mdepth, sand,  9 February 1971, 30 specimens; UANL 8011: St. 22, 40°54’S, 65°01’W, 16 mdepth, gravel, 11 February 1971, coll. J.M. Orensanz, 50 specimens; UANL 8012: St. 24, 41°02’S, 65°08’30”W, 15 mdepth, 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;   UANL8014:  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 specimen; UANL 8015: St. 5, 40°54’S, 64°31’W, 20–24 mdepth, sand, 14 February 1971, coll. J.M. Orensanz, 4 specimens; UANL 8016: St. 15, 41°01’S, 64°15’W, 33–36 mdepth sand & mud, 15 February 1971, coll. J.M. Orensanz, 1 specimen; UANL 8017: St. 53, 41°00’S, 65°06’W, 38 mdepth, 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 SAOII,   UANL8019:  Golfo de San Matías, St. 54, 40°57’S, 65°03’W, 41.5 m depth,  17 February 1971, 2 specimens.  Campaña SAOV,   UANL8020:  Golfo de San Matías, St. 226, 40°53’S(longitude coordinates lost), 1 kmoff beach S of Bajo Oliveira,  20 mdepth,  5 March 1973, coll. J.M. Orensanz, 1 specimen;   UANL8021: St. 228, 40°53’S(longitude coordinates lost), slightly S of Bajo Oliveira,  21 mdepth, coarse sand & gravel,  5 March 1973, coll. J.M. Orensanz, 1 specimen;   UANL8022: St. 236, 40°53’S(longitude coordinates lost), off  El Buque,  20 mdepth, shell,  6 March 1973, coll. J.M. Orensanz, 1 specimen;   UANL8023: St. 240, 40°53’S, 64°55’W, between Bancos Palizaand Lobos,  18 mdepth,  6 March 1973, coll. J.M. Orensanz, 6 specimens; 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 COMPII,   UANL8025: Santa Claradel Mar, St. 7, 37°50’S, 57°24’W,  2 August 1963, 72.19 m depth, medium-fine sand, 108 specimens.  Campaña COMPV, UANL 8026: St. 72, 38°18’S, 57°45’W, 25 mdepth, medium sand, 27 May 1964, 3 specimens;   UANL8027: inner shelf off Mardel Plata, St. 81, 37°42’S, 57°17’W,  28 May 1964, 19 m depth, fine, medium & coarse sand, 2 specimens. Campaña Almirante Saldanha, UANL 8028: St. 2262a, 36°24’S, 55°00’W, 47 mdepth, 9 November 1969, 1 specimen; UANL 8029: St. 2287a, 38°05’S, 56°43.5’W, 67 mdepth, 16 November 1969, 2 specimens;   UANL8030: IslaJabalí, BahíaSan Blas, 40°34’ 50”S, 62°10’ 35”W, intertidal,  April 1970, coll. J.M. Orensanz, A. Escofet& M.C. Estivariz, 3 specimens;   UANL8031, BahíaSan Blas, 40°33’S, 62°14’W,  March 1970, intertidal, 5 specimens.  Campaña MEJILLONI,   UANL8032: Provincia de Buenos Aires, St. 11, 37°30’S, 56°33’W,  47 mdepth, mud,  10 November 1971, 1 specimen; UANL 8033: St. 13, 37°20’S, 56°22’W, 47 mdepth, mud, 10 November 1971, 1 specimen; UANL 8034: St. 15 bis, 37°10’S, 56°15’W, 28 mdepth, sand, 10 November 1971, 2 specimens; UANL 8035: St. 18, 37°16’S, 56°06’W, 48 mdepth, mud, 11 November 1971, 1 specimen;   UANL8036: Golfo San Matías, Las Grutas, 40°48’S, 65°05’W, intertidal, sheltered sandy beach,  February 1972, 1specimen. URUGUAY, Campaña Akademik Knipovich, UANL 8037: St. 250, 34°51’S, 52°35’W, 83 mdepth, 1965, coll. V.N. Semenova & V. Scarabino, 20 specimens; UANL 8038: St. 1059, 35°25.9’S, 53°27.9’W, 80– 72 mdepth, 1967, coll. V.N. Semenova & V. Scarabino, 1 specimen; UANL 8039: St. 1068, 34°15’S, 52°12’W, 55–62 mdepth, 1967, coll. V.N. Semenova & V. Scarabino, 1 specimen; UANL 8040: St. 1071, 34°22.9’S, 52°37.2’W, 36– 42 mdepth, 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. 2B). 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. 3A). Lateral flanges broad ( Fig. 3A). Radiolar tips long, filiform (space of 20 pinnules) ( Fig. 3B). Dorsal lips broadly rounded basally with a straight, radiolar appendage ( Fig. 3D). Ventral lips rounded, small. Three to four pairs of ventral radiolar appendages of different lengths, all shorter than branchial crown length ( Fig. 3D); 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. 2C). Entire lengths of mid-dorsal collar margins form narrow gap ( Fig. 2D). Dorsal pockets well developed. Ventral shield of chaetiger 1 horseshoe-shaped, swollen ( Fig. 2E). Ratio of posterior peristomial ring collar length versuschaetiger 2 length, in lateral view: 1.5:1 ( Fig. 2C). Trunk cylindrical ( Fig. 2A). 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. 3E). Neuropodia: acicular uncini handles as long as 10 times length of main fang ( Fig. 3F), distributed as regular row, dentition covering half length of main fang ( Fig. 3G), hood present. Glandular ridge on chaetiger 2 narrow all around ( Fig. 2C–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. 3H). Pygidium triangular ( Fig. 2F), 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. 2C–E). Anterior end of first ventral glandular shield does not take up stain, lateral sides of collar ventral shield dark ( Fig. 2C).     Typelocality. Golfo de San Matías, Argentina, 40°57’S, 65°05’W.   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 Sabellidaefrom South America.   Remarks.As stated above only three species of  Chonehave been described from South America:  C. insularisfrom IlhaGrande, Brazil, by Nonato (1981), and  C. roseaand  C. striata, which were both described from off South Chileby Hartmann-Schröder (1965).  Chone orensanzi  sp. nov., differs from  C. insularisand  C. striataby having a collar segment as long as 1.5 thoracic segments whereas in  C. insularisand  C. striatait 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. roseaand  C. striatait is covered by the collar.  Chone roseahas 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 inMoore, 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. mollispaleate 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) versus7 times the length of the main fang in  C. mollis.  Augener (1931)reported  C. infundibuliformis Krøyer, 1856, from between the Rio Grandeand 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. infundibuliformisby 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  Chonesp. cf.  C. dunerifrom 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  Chonespecies 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 UANL 8009 were found infested with copepods ( Fig. 3C) but the identity of these parasites remains unknown. Members of three families of copepods are typically external parasites of sabellids: Gastrodelphyidae, Sabelliphilidaeand Rhynchomolgidae. Many species of these copepod families have been reported on sabellids of the genera  Eudistylia,  Acromegalomma,  Parasabella,  Pseudopotamilla,  Bispira,  Myxicola,  Potamilla, Perkinsianaand  Sabella( Capa et al.2014and references therein), but none on members of  Chone.   TABLE 1.Selected features of species of  Chonedescribed from South America.    Species Type locality Radiolar tips Radiolar flanges Ventral shield of collar Anterior peristomial ring lobe Ratio of collar length vschaetiger 2 length (in lateral view)    Chone insularisNonato, 1981[ nomen nudum] Ihla Grande, Long Brazil ? ? ? 3:1    Chone orensanzi sp. nov. Golfo de San Long, filiform Matías, Argentina Broad Horseshoe- shaped Exposed beyond collar margin 1.5:1    Chone roseaHartmann-Schröder, 1965 off South Chile Extra long, filiform Broad Sunglasses- shaped Not exposed beyond collar margin 2:1    Chone striataHartmann-Schröder, 1965 Bahía Inglés, Short, Chile digitiform ? Horseshoe- shaped Not exposed beyond collar margin 3:1  Genus  Jasmineira Langerhans, 1880  Remarks.  Jasmineirais 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. crumeniferaHartmann- Schröder, 1986, from South Shetlands, 488 mdepth;  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 mdepth. In this study, we report  J. crumeniferafrom the Uruguayan shelf. 1572324662 1971-02-17 UANL, SAO Golfo de San Matias & J. M. Orensanz. Argentina -40.95 Golfo de San Matias 1159 -65.083336 Campana 7 8 UANL 8008 1 1572324651 [386,791,1547,1571] SANJO Argentina Campana 7 8 1 1572324658 1976-05 UANL, SAO El Riacho & J. M. Orensanz & Campana Argentina -42.4 El Riacho 1150 -64.583336 7 8 UANL 8009 2 Golfo de San Jose 1572324678 1971-02-09 UANL Argentina 10 Las Grutas 7 8 UANL 8010, 40 30 Golfo de San Jose 1572324670 1971-02-14 UANL Golfo de San Matias & J. M. Orensanz Argentina -40.883335 Golfo de San Matias 1159 -64.71667 7 8 UANL 8014 1 Golfo de San Jose 1572324650 [1009,1204,1943,1967] SAO Argentina Campana 7 8 1 Golfo de San Jose 1572324674 1971-02-17 UANL Golfo de San Matias Argentina -40.95 Golfo de San Matias 1159 -65.05 7 8 UANL 8019 2 Golfo de San Jose 1572324686 [1152,1348,1979,2003] SAO Argentina Campana 7 8 1 Golfo de San Jose 1572324668 1973-03-05 UANL Golfo de San Matias & J. M. Orensanz Argentina 20 8 9 -40.883335 Bajo Oliveira Golfo de San Matias 7 8 UANL 8020 1 Golfo de San Jose 1572324673 1973-03-05 UANL J. M. Orensanz Argentina 21 -40.883335 Bajo Oliveira 8 9 UANL 8021 1 Golfo de San Jose 1572324656 1973-03-06 UANL El Buque & J. M. Orensanz Argentina 20 -40.883335 El Buque 8 9 UANL 8022 1 Golfo de San Jose 1572324669 1973-03-06 UANL J. M. Orensanz Argentina 18 -40.883335 Bancos Paliza 1159 -64.916664 8 9 UANL 8023 6 Golfo de San Jose 1572324684 [983,1205,368,392] COMP Argentina Campana 8 9 1 Golfo de San Jose 1572324689 1963-08-02 UANL Argentina -37.833332 Mar 1179 -57.4 Santa Clara 8 9 UANL 8025 108 Golfo de San Jose 1572324688 [151,369,440,464] COMP Argentina Campana 8 9 1 Golfo de San Jose 1572324683 1964-05-28 UANL Campana Almirante Saldanha Argentina -37.7 Plata 1180 -57.283333 Mar 8 9 UANL 8027 2 Golfo de San Jose 1572324685 1970-04 UANL J. M. Orensanz & A. Escofet & M. C. Estivariz Iceland -40.580555 Bahia 19 -62.17639 8 9 UANL 8030 3 Bahia 1572324681 1970-03 UANL Iceland -40.55 Bahia 1162 -62.233334 8 9 UANL 8031 5 Bahia 1572324691 [493,764,656,680] MEJILLON Iceland Campana 8 9 1 Bahia 1572324687 1971-11-10 UANL Iceland 47 -37.5 Provincia de Buenos Aires 1181 -56.55 8 9 UANL 8032 1 Provincia de Buenos Aires 1572324696 1972-02-01 UANL Iceland -40.8 Las Grutas 1160 -65.083336 Golfo San Matias 8 9 UANL 8036 1 Provincia de Buenos Aires 1572324697 [199,948,1879,1904] Golfo de San Matias Argentina -40.95 Argentina 1159 -65.083336 8 9 1 holotype