Revision of the taxonomy of Polycirrus Grube, 1850 (Annelida: Terebellida: Polycirridae) Author Glasby, Christopher J. chris.glasby@nt.gov.au Author Hutchings, Pat chris.glasby@nt.gov.au text Zootaxa 2014 2014-10-21 3877 1 1 117 journal article 5268 10.11646/zootaxa.3877.1.1 344cf70d-6a17-464b-9a35-40324bcef9d4 1175-5326 4948375 2695A2A6-2805-4FC6-B6B6-A8C68354B944 Polycirrus holthei Londoño-Mesa & Carerra-Parra, 2005 Fig. 31a–e , Table 1 Polycirrus holthei Londoño-Mesa & Carerra-Parra, 2005: 4–6 , fig. 1D–H. Type locality. Cancún , Mexico . Material examined. None. FIGURE 31. Polycirrus holthei Londoño-Mesa and Carerra-Parra. a. Entire body, dorsal view; b. Anterior, end, ventral view; c. Pinnate chaeta from segment 2. d. Uncini from segment 8. e. Uncini from segment 14. Scales e, c, d=0.02 mm, b, a=1 mm. (Modified after Londoño-Mesa and Carerra-Parra, 2005 and reproduced with permission from Zootaxa ). Type material. HOLOTYPE : ECOSUR 0054 , Mexico , Cancún , Punta Nizuc , 21°02′11.7′′ N , 86°46′44.2′′ W , coll. 10.ii.2001 , 2 m, in coralline rock. Description. Based on type description. Holotype complete with 42 segments, 6.5 mm long, 1.1 mm wide; paratypes with up to 46 segments. Body transparent when preserved. Dorsum anteriorly smooth ( Fig. 31a ). Venter anteriorly with mid-ventral groove and discrete ventro-lateral pads (visible only with stain); pads more-or-less smooth, extending from segment 2 to 6–7. Mid-ventral groove from segment 3 ( Fig. 31b ). Buccal tentacles two types : (1) cylindrical, thickened distally, distinctly grooved and (2) cylindrical, uniformly thin, weakly grooved. Prostomial ridge distinctly curved, extending laterally along anterodorsal base of upper lip. Upper lip trefoiled, small wing-like, clover-shaped lobes laterally, margin of medial lobe straight and narrow. Outer lower lip flat, shield-like, oblong, wider than long, ridged and grooved, extending posteriorly to segment 2. Achaetous segments visible dorsally but obscured ventrally ( Fig. 31a, b ). Notochaetigerous segments 10–13, extending to segments 12–15. Notopodia digitiform, pointed. Notochaetae within a chaetiger one type , two distinct lengths, pinnate, posteriorly same form as those anteriorly ( Fig. 31c ). Neurochaetae beginning on segment 6. Uncini with long neck and concave base ( Type 2), anterior ones with almost flat base and smaller, teeth above main fang arranged in double or triple transverse series (anteriorly MF:1:3-4:5-6, but see comments; posteriorly MF:1:1) enlarged median tooth above main fang present, subrostral process absent ( Fig. 31d,e ). Nephridial papillae present, spherical. Pre-gular membrane nephridial papillae absent. Post-gular membrane nephridial papillae present, extending from segment 5 to 11–13; situated at posteroventral base of notopodia ( Fig. 31a ). Pygidium papillated ring with nine short papillae. Comments. The dental formula for the thoracic neurochaetae provided by Londoño-Mesa & Carerra-Parra (2005) suggests three rows of teeth above the main fang, yet their figure ( Fig. 31e ) shows only two rows, at least in the way that we interpet a row (successive curved lines of teeth). Therefore using our definition, the dental formula would be MF:1:8–10. Another discrepancy between the description and the figures is in regard to the position of the nephridial papillae. Londoño-Mesa & Carerra-Parra (2005) state that they are posterior to the notopodia, but figure 31a, b clearly show them to be anterior to the notopodia.