Neoamphitrite glasbyi 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 : 42

Neoamphitrite glasbyi Londoño-Mesa & Carrera-Parra, 2005

Neoamphitrite glasbyi Londoño-Mesa & Carrera-Parra, 2005:22–23 ; Figs 6 A-E.

Type material: Holotype ECOSUR 056 Off Majahual, Mexican Caribbean (18°41'51"N 87°41'34.8"W), R/V “Edwin Link” Sta. 2783, 24.VIII.1990; 59m.

Additional material: Antilles: UMML 22.983 (1) Trinidad (11°25'N 62°40'W), R/V “Pillsbury” Sta. 709; 19.VII.1978; 71m. UMML 22.388 (2) Southeastern Dominican Republic (18°19'N 70°46'W), R/V “Pillsbury” Sta. 1298; 30.VII.1970; 23m. (as Terebella rubra ). UMML 22.998 (5) North Dominican Republic (20°00'N 71°41'W), R/V “ Pillsbury ” Sta. 1148; 1.I.1970; 38m.

Diagnosis: Holotype complete, with 82 segments, 21mm long; thorax 13mm long, 2.5mm wide. Small swellings on segment 4, between notopodial base and nephridial papillae. Branchiae branched. Fourteen ventral shields. Eight pairs of rounded nephridial papillae. Thirty-nine segments with notopodia; notochaetae of two lengths sub-distally bilimbate and distally serrated. Uncini in double rows in segments 11–41; uncini avicular MF:4–5:5–6:8–10. Pygidium rounded, with about 10 short papillae.

Staining pattern: Only ventral shields stain deeply. Rest of structures remain pale.

Variation: Complete specimens have 79–82 segments, with 37 pairs of notopodia, and are 51.5–65.0mm long. Thus, the ratio segments/chaetigers for the additional specimens is 2:1 (79/37), the same found in the holotype (82/39), which means that this species has segments with notopodia present until mid body. Width is 4.5–5.5mm in all specimens. Nephridial papillae present in segments 2–10, which indicates that the species could be considered having papillae from segment 2, and that in the holotype the first pair of papillae are not well developed. Ventral shields appear to extend up to segment 18.

Discussion: A complete description of the species was provided by Londoño-Mesa & Carrera-Parra (2005). The original distribution of the species has been expanded to include records from the Dominican Republic and Trinidad. Nevertheless, as for other species in this revision, there were insufficient additional specimens to confirm whether this species occurs also in coasts of the Gulf of Mexico and Central America. The report by Kritzler (1984) of Neoamphitrite edwardsi ( de Quatrefages, 1865) differs from this species in having lateral lappets on segments 2–4, nephridial papillae absent, ventral shields from segment 6, and uncini with more rows of teeth.

Type locality: Majahual, Mexican Caribbean .

Distribution: Majahual (Mexican Caribbean ), Dominican Republic and Trinidad, in 23– 71m.

Figures

FIGURE 6. Polycirrus purpureus. Type specimens of P. luminosus (Hypotype YPM 1311): A. General view. B. Thoracic region in lateral view. C-D. Thoracic region in ventral view. E. Fascicle of notochaetae from anterior thoracic region. F. Notochaeta from anterior thoracic region. G-H. Uncini from anterior thoracic region. Scale bars: A: 1.85mm; B,C,D: 1mm; E: 0.5mm; F: 0.05mm; G: 0.02mm.