Polycirrus holthei Londoño-Mesa & Carrera-Parra, 2005

Londoño-Mesa, Mario H., 2009, Terebellidae (Polychaeta: Terebellida) from the Grand Caribbean region 2320, Zootaxa 2320 (1), pp. 1-93 : 22

Polycirrus holthei Londoño-Mesa & Carrera-Parra, 2005

Polycirrus holthei, Londoño-Mesa & Carrera-Parra, 2005:4–6 ; Figs 1 D-H.

Type material: Holotype ECOSUR 054 Nizuc Point, Cancun (21º02'11.7"N 86º46'44.2"W), 10.II.2001, 2m, in coralline rock . Paratypes: LACM-AHF Poly 2201 (2) Nizuc Point, Cancun (21º02'11.7"N 86º46'44.2"W), 10.II.2001, 2m, in coralline rock . NHM ANEA 2009.5 - 6 (2) Nizuc Point, Cancun (21º02'11.7"N 86º46'44.2"W), 10.II.2001, 2m, in coralline rock .

Additional material: Gulf of Mexico: Veracruz State: UANL (4) Sacrificios Island, 13.VII.2000; IS-03. UANL (1) Pajaros, 30.V.2003; Pl.2. Mexican Caribbean : Quintana Roo State: ECOSUR TERE-14 (5) Camping, Contoy Island (21º30'08.4"N 86º47'45.3"W), 1.III.2001, 1– 2m, in dead Strombus gigas conch. TERE-14 (1) Camping, Contoy Island (21º30'08.4"N 86º47'45.3"W), 28.II.2001, 1m, in coralline rock. TERE-14 (1) Corona Beach, Cozumel Island (20º22'18"N 86º01'27"W), 25.II.1999, 2m. UQROO E-6 (2) Chacmochuk, Blanca Island (21º20'16.8"N 86º47'40.4"W), 5.IV.2000. Antilles: ZMA V.Pol. 5290 (2) Boekoeti, NW seaside, Aruba, Sta. 1006B; 6.V.1955; Rhizophora . ZMA V.Pol. 5311 (2) SW coast, Tortuga, Sta. 1211; 1.VIII.1936; Rhizophora , eelgrass, muddy sand, tidal of lower zone. ZMA V.Pol. 5293 (1) Playa Lechi, North of Hotel, Bonaire, Sta. 1646; 25.IX.1968; tidal zone, beach rock. ZMA V.Pol. 5306 (2) Awa di Oospunt, Curaçao, Sta. 75-41; 14.IX.1975; 3– 4m. ZMA V.Pol. 5298 (3) Lac cas di Meenchi, Bonaire, Sta. 75-71; 24.IX.1975; 0.8– 1m.

Diagnosis: Tentacles short, arising from a swollen tentacular membrane. Tentacular membrane with free edge as thin, clover-like membrane; lower lip reduced but conspicuous. Seven pairs of nephridial papillae from segment 4, posterior to notopodia, first two pairs smaller. Five pairs of ventral shields from segment 3, then ventral groove along remainder body. Notopodia from segment 2; twelve segments with notochaetae. Notochaetae of two lengths, both pinnate. Neuropodia from segment 5, thoracic uncini smaller than abdominal, MF:1:3–4:5–6, Sr straight, SrA absent; AP rounded; AF absent; Bs slightly convex; PP square; PF absent; Oc straight, Cp convex, with three rows of teeth over MF. Abdominal uncini MF:1:1, Sr wide, large and concave; SrA absent, AP rounded, projected forwards; AF absent; Bs slightly convex; PP long, projected dawnwards, finishing rounded; PF absent; Oc long, straight; Cp slightly curved, with two rows of teeth over a long and thin MF. Pygidium rounded; 9 anal papillae.

Staining pattern: Only ventral shields and nephridial papillae stain deeply; remaining structures do not stain.

Variations: Complete specimens from the Antilles have 24–41 segments, 7–9mm long, with thorax 1– 5mm long and 0.3–1mm wide; some specimens have 7–8 nephridial papillae from segment 5, 6 or 7, and the pygidium is smooth.

Discussion: First record since original description. The distribution is expanded with additional specimens from the Lesser Antilles.

Type locality: Northern Mexican Caribbean .

Distribution: Mexican Caribbean and Lesser Antilles.

Figures

FIGURE 1. Uncini types: A. Avicular. B. Pecinate. MF: Main Fang. Sr: Subrostrum. USr: Upper Subrostrum. LSr: Lower Subrostrum. SrP: Subrostral Process. SrA: Subrostral Appendix. AP: Anterior Process. AF: Anterior Filament. Bs: Base. PP: Posterior Process. PF: Posterior Filament. Cp: Capitium. Oc: Occipitium. UOc: Upper Occipitium. LOc: Lower Occipitium.