Syllis magnipectinis Storch, 1967

Salcedo, Diana L. & Solís-Weiss, Guillermo San Martín And Vivianne, 2012, The genus Syllis (Polychaeta: Syllidae: Syllinae) in the southern Mexican Pacific, with the description of two new species and three new records, Zootaxa 3263, pp. 47-62 : 50-51

Syllis magnipectinis Storch, 1967

Syllis (Typosyllis) magnipectinis: Storch, 1967: 106 –107, Figs 4–5 .

Typosyllis magnipectans (sic): Hartman, 1974: 617.

Typosyllis magnipectinis: Licher et al., 1995: 107 –113, Figs 1–3 ; Licher, 1999: 185. abb. 83; Paxton & Chou, 2000: 215; Wehe & Fiege, 2002: 164.

Syllis (Typosyllis) sp. A: Uebelacker, 1984: 30 –134, Fig. 30–126.

Material examined. 11 specimens (CPICML PO-37-083). 3 specimens, Caleta E1B1, 16°49.797’N, 99°54.062’W, 25 May 2006, 12 m, coarse sand. 4 specimens, Palmitas E2B1, 16°49.420’N, 99°54.733’W, 25 May 2006, 10.5 m, coarse sand. 2 specimens, Palmitas E2B2, 16°49.420’N, 99°54.733’W, 25 May 2006, 10.5 m, coarse sand. 2 specimens, El Jardín E3B2, 16°49.436’N, 99°54.981’W, 26 May 2006, coarse sand.

Comparative material examined. Syllis ortizi , 2 specimens (CPICML PO-37-034). MEXICO: North of Paraiso, Tabasco, 18°28´2” N, 94°08´30” O, 45 m. Syllis ortizi , 1 specimen (CPICML PO-37-034). MEXICO: East of Anton Lizardo, Veracruz 19°10´58.62” N, 95°45´31.62 O, 85 m. Syllis ortizi , 8 specimens (CPICML PO-37- 034). MEXICO: North of Nanchital, Tabasco 18°29´N, 93°59´O, 63 m.

Remarks. Syllis magnipectinis ( Storch, 1967) belongs to a small group of species characterized by having falcigers with a considerably large subdistal tooth and large subdistal spines: Syllis cruzi Núñez & San Martín, 1991 , Syllis glarearia ( Westheide, 1974) , Syllis guidae Nogueira & Yunda-Guarín, 2008 , Syllis jorgei San Martín & López, 2000, Syllis lutea ( Hartmann-Schröder, 1960) and Syllis ortizi San Martín, 1992. Nonetheless, this species is characterized by having midbody and posterior enlarged falcigers with very thick blades and a prominent subtriangular subdistal tooth, more than five times larger than the distal one. Syllis magnipectinis most closely resembles S. ortizi . In fact, some specimens from the Gulf of Mexico have been confused, since they were originally assigned by Uebelacker (1984) to a single species named Syllis sp. A but later recognized by San Martín (1992) and Storch (1995) as the two species mentioned above. However, S. ortizi has falcigers with a smaller subdistal tooth, and distal spines extending beyond the distal tooth.

Most specimens from Acapulco differ slightly from those described by Licher et al. (1995). However, such variations could be size-related, as small specimens have wider and shorter palps, robust falcigers lacking small basal spines, and normal falcigers with shorter blades (a character that is also size-dependent in other species such as Syllis guidae ) and larger distal spinulation. Large specimens have larger and thinner palps, the blades of normal falcigers are larger and, in most cases, the spinulation becomes uniform, thus being more similar to the original description. The other examined characters agree well with the original diagnosis. Originally described from the Red Sea ( Storch, 1967) and later recorded in the Gulf of Mexico and in the South China Sea, the present record is the first for the eastern Pacific. Therefore, the species may be considered as circumtropical, being now known from the tropical zones of the three major oceans of the world.

Figures

FIGURE 1. Syllis antoniae n. sp. (A) Anterior end, dorsal view. (B) Anterior chaetae. (C) Anterior aciculae. Scale 40 µm.

FIGURE 2. SEM of Syllis antoniae n. sp. (A) Anterior end, dorsal view. (B) Detail of dorsum (pores). (C) Superior chaetae, anterior chaetiger. (D) Median and most inferior chaetae, anterior chaetiger. (E) Dorsal simple chaeta. (F) Ventral simple chaeta. Scale: (A) 50 µm. (B, D) 10 µm. (C, E – F) 5 µm.

FIGURE 3. Syllis antoniae n. sp. (A) Midbody chaetae. (B) Midbody aciculae. (C) Posterior chaetae. (D) Posterior aciculae. (E) Dorsal simple chaeta. (F) Ventral simple chaeta.

FIGURE 4. Syllis deleoni n. sp. (A) Anterior end, dorsal view. (B) Anterior chaetae. (C) Anterior aciculae. Scale 40 µm.

FIGURE 5. SEM of Syllis deleoni n. sp. (A) Anterior end, dorsal view. (B) Everted pharynx. (C) Dorsum, detail of pores. (D) Dorsal cirri. (E) Dorsal cirri articles, detail of pores and cilia. (E) Anterior chaetae. Scale: (A, D) 100 µm. (B) 20 µm. (C, E – F) 5 µm.