Pistella papillosa ( Tourtellotte & Kritzler, 1988 ) Londoño-Mesa, 2009

Londoño-Mesa, Mario H., 2009, Terebellidae (Polychaeta: Terebellida) from the Grand Caribbean region 2320, Zootaxa 2320 (1), pp. 1-93 : 53-54

publication ID	https://doi.org/ 10.11646/zootaxa.2320.1.1
DOI	https://doi.org/10.5281/zenodo.5324780
persistent identifier	https://treatment.plazi.org/id/03F75303-AE6A-FF8B-FF7E-FAE53CF9811D
treatment provided by	Felipe
scientific name	Pistella papillosa ( Tourtellotte & Kritzler, 1988 )
status	comb. nov.

Treatment

Pistella papillosa ( Tourtellotte & Kritzler, 1988) View in CoL comb. nov.

Figures 15 View FIGURE 15 A-H

Scionella papillosa, Tourtellotte & Kritzler, 1988:79–81 View in CoL , Fig. 1 View FIGURE 1 .

Pista papillosa, Saphronova, 1991:246 View in CoL .

Type material: Paratypes USNM 99377 About USNM (1) Sanibel Island , Florida (26°17′24″N 82°19′57″W), 6.XII.1983; 16m. (Holotype USNM 99376 About USNM (1) not examined) GoogleMaps .

Additional material: Gulf of Mexico : Veracruz State: UANL 6501 View Materials (1) Pajaros, 30.V.2003 ; Pl.1. Antilles: ZMA V.Pol. 7541D (1) Awa di Oospunt , Hylech, Curaçao, 14.IX.1975; 3–4m.

Description: Paratype complete, in two fragments, anterior fragment with 30 segments, 12.5mm long; thorax 7mm long, 0.7mm wide ( Fig. 15A View FIGURE 15 ). Posterior fragment with 82 segments, 15.1mm long. Tentacular membrane reduced; eyespots absent; tentacles long and thin. Upper lip long, folded dorsally. Lower lip small. First pair of lateral lappets elongate laterally ( Fig. 15B View FIGURE 15 ); second pair smaller than first, laterally covering segment 2. Third pair of lateral lappets more dorsal than first pair ( Fig. 15C View FIGURE 15 ). One pair of branchiae on segment 2, pompom-like (branching filaments in a spiralled arrangement), usually one of the branchiae longer, as long as about 7 thoracic segments. Nephridial papillae on segments 6–7, almost inconspicuous. Fifteen ventral shields, equal-sized, from segment 3; first two shields shorter, rectangular, then, shields trapezoidal, all of same size. Notochaetae smooth and symmetrically bilimbate, distally pointed, in two lengths with similar shape alternating long and short in the same fascicle ( Figs 15 View FIGURE 15 D-F). Anterior thoracic neuropodia with 10–12 uncini per tori, and posterior thoracic uncini with 8–10 uncini per tori. Thoracic uncini ( Fig. 15G View FIGURE 15 ) MF:5–6:5– 6:4–5 PP and PF absent; Oc concave; Cp with 3 series of teeth over a curved MF; USr short, flat; SrP short, poorly developed; SrA not seen; LSr convex; AP long, rounded; AF absent; Bs strongly convex. Abdomal neuropodia with 5–7 uncini per tori or less in posterior abdomen; MF:4–5:4–5:3–4, PP and PF absent, Oc curved; Cp with 3 series of teeth over curved MF; USr flat; SrP absent, LSr convex; AP and AF absent; Bs strongly convex. Abdominal neuropodia flat, with long tori, until segment 35; then, tori shorter through posterior end. Last neuropodia closer to each other. Pygidium smooth, without papillae ( Fig. 15H View FIGURE 15 ).

Staining pattern: Lateral lappets on segments 1 and 3, dorsum on segments 2–4 and anterior margin of the ventral shields stain deeply ( Figs 15 View FIGURE 15 A-C). All ventral shields stain deeply, with a lighter line on the posterior edge ( Fig. 15A View FIGURE 15 ); gap between shields papillate; papillae in two groups laterally to a ventral middle line. The remaining thoracic and abdominal structures exempt from staining.

Variations: Additional specimen has 80 segments, 8mm long, thorax 3mm long, 0.5mm wide, with abdomen damaged by segments 25–30.

Discussion: Saphronova (1991) considered that Scionella papillosa belonged to Pista , because of the presence of one pair of pompom-like (bottle-brush) branchiae on segment 2, and notochaetae with smooth tips. But Scionella has one pair of branchiae on segment 4 and notochaetae distally serrated. On the other hand, Pista is characterized by uncini with long posterior process and filament in all thoracic uncinigers. Thus, since this species has one pair of bottle brush-like branchiae in segment 2, and all thoracic uncini without a posterior process and posterior filament but with the base strongly curved and convex, this species belongs to Pistella Hartmann-Schröder, 1996 .

Type locality: Sanibel Island , Florida, USA .

Distribution: Florida, Curaçao. From shallow water to 16m.