Parasabella yonowae, 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: 33

publication ID 10.5281/zenodo.828032

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Parasabella yonowae

sp. nov.

Parasabella yonowae  sp. nov.

( Figs 15View FIGURE 15, 16View FIGURE 16, 32View FIGURE 32 C)

Material examined. Type material: ARGENTINA, Holotype ( UANL 8069View Materials), 3 paratypes ( UANL 8070View Materials), Campaña Sanjo II, Golfo de San José, off El Riacho, 42°24’S, 64°35’W, subtidal, May 1976, coll. J.M. Orensanz. Additional materialGoogleMaps  : ARGENTINA, UANL 8071View Materials: Campaña Sanjo II, Golfo de San José, off San Roman , 42°16’S, 64°14’W, 60.35 m depth, dredge haul 3, on cerianthid tubes, coll. J.M. Orensanz, 11 May 1976, 1 female with abdominal oocytesGoogleMaps  . UANL 8072–8073View Materials: Puerto Deseado , Provincia de Santa Cruz, encrusting community, 6.5 m depth, 18 October 2005, coll. E. Schwindt, 5 specimens, and St. 1E, fouling communities on succession panels, 22 May 2007, coll. E. Schwindt, 2 specimens, respectively  . URUGUAY, UANL 8074View Materials: Campaña Akademik Knipovich , St. 1055, 36°16’S, 54°01.5’W, 92–96 m depth, 1967, 1 specimenGoogleMaps  .

Description. Trunk length 58 mm (16–20 mm), width 5 mm (2–3.5 mm). Branchial crown 17 mm length (9 – 10 mm), with 27 pairs of radioles (13 – 16 pairs). Eight thoracic and 112 abdominal segments (44 – 64). Palmate membrane and radiolar eyes absent ( Fig. 16View FIGURE 16 A). Radioles with narrow flanges basally ( Fig. 16View FIGURE 16 B), then very broad including radiolar tips ( Fig. 16View FIGURE 16 C, D). Longest pinnules at mid-radiole length. Radioles with very long, digitiform tips, flattened, as long as equivalent space of 30 pinnules ( Fig. 16View FIGURE 16 C). Dorsal lips triangular ( Fig. 15View FIGURE 15 F), as long as chaetiger 1 in ventral side, erect, with distinct radiolar appendages and adjacent lateral lamellae and one dorsal pinnular appendage. Ventral lips broadly rounded with two ventral pinnular appendages. Parallel lamellae present, sometimes exposed, in between ventral lappets on ventral incision of collar ( Fig. 15View FIGURE 15 D, F). Mid-dorsal collar margins not fused to faecal groove, exposing anterior peristomial ring ( Fig. 15View FIGURE 15 A, B). Faecal groove wide and depth in thorax ( Fig. 15View FIGURE 15 A, B). Ventral lappets of collar short with rounded distal margins ( Figure 15View FIGURE 15 D, E), not overlapping ( Fig. 15View FIGURE 15 D), or slightly overlapping ( Fig. 15View FIGURE 15 E). Lateral collar margins even, covering basal union of radioles ( Fig. 15View FIGURE 15 C). Ventral shield of chaetiger 1 swollen, rectangular, with concave anterior margin and convex lateral margins, 1.5 times longer than length of chaetiger 2 shield ( Fig. 15View FIGURE 15 D, E), sometimes with shallow longitudinal and transverse divisions. Chaetiger 1 with elongate narrowly hooded chaetae. Thoracic ventral shields trapezoidal ( Fig. 15View FIGURE 15 D, E). Chaetiger 2 slightly shorter than others, not contacting ventral shield, 3–8 thoracic neuropodial tori in contact with shields ( Fig. 15View FIGURE 15 E). Superior thoracic notochaetae narrowly hooded, two times longer than inferior group, hood 1/8 width of shaft. Inferior thoracic notochaetae narrowly hooded (Type B), hood 1/4 width of shaft ( Fig. 16View FIGURE 16 E, F). Thoracic uncini with nine rows of teeth of equal size above main fang, occupying one-half length of main fang, hood absent, breast well developed, handles two times longer than main fang (medium size) ( Fig. 16View FIGURE 16 H). Companion chaetae with denticulate bulbous head with one longer tooth, and elongate membranous tip ( Fig. 16View FIGURE 16 I). Abdominal chaetae with two rows of elongate, with very narrow hoods, all chaetae equal in size ( Fig. 16View FIGURE 16 G). Abdominal uncini dentition similar to thorax but with short handles, two times as long as main fang and 7 – 8 rows of teeth. Pygidium rounded; two groups of reddish-brownish pygidial eyes of unequal size. Tubes unknown.

Type locality. Golfo de San José, off El Riacho, 42°24’S, 64°35’W, subtidal.

Etymology. The species is named after Dr. Nathalie Yonow, an expert on nudibranchs, in recognition of her kind support for the shipment of Phyllis Knight-Jones and Jose María ‘Lobo’ Orensanz’s sabellid collections to Mexico. Through her kind support, these collections have been very useful for the study of South American sabellids.

Remarks. Parasabella columbi  and P. yonowae  sp. nov., were found in the Golfo de San José. The major differences between P. yonowae  sp. nov., and P. columbi  are the following: 1) In P. yonowae  sp. nov., the ventral shield of chaetiger 1 is 1.5 times longer than the length of chaetiger 2 shield (twice as long as the length of the shield in P. columbi  ); 2) the ventral lappets of collar are triangular and long in P. columbi  (distally rounded, short in P. yonowae  sp. nov.); 3) the radiolar tips are very long in P. yonowae  sp. nov., as long as equivalent space of 30 pinnules (short in P. columbi  , equivalent to 8–9 pinnules); 4) flanges are narrow along radioles in P. columbi  (narrow at the radiolar bases, then broad towards radiolar tips in P. yonowae  sp. nov.); 5) P. yonowae  sp. nov., has pygidial eyes (absent in P. columbi  ) ( Table 2).

Parasabella yonowae  sp. nov., have very long radiolar tips versus short tips in P. columbi  and P. leucaspis  complex. Radiolar tips have wide flanges in P. yonowae  sp. nov., and P. fernandezensis  , however in the latter species the tips are lanceolate, leaf-like, whereas in P. yonowae  sp. nov., flanges are even. The ventral lappets are short in P. yonowae  sp. nov., and P. leucaspis  complex whereas in P. columbi  these are long ( Table 2).


Universidad Autonoma de Nuevo Leon