Eunice annulicirrata Miura, 1986

Hsueh, Pan-Wen & Li, Yan-Huei, 2014, New species and new records of eunicids (Polychaeta, Eunicidae) from Taiwan, Zootaxa 3802 (2), pp. 151-172 : 152-155

publication ID	https://doi.org/ 10.11646/zootaxa.3802.2.1
publication LSID	lsid:zoobank.org:pub:20400951-A62C-49FD-9D70-3FE54557E5D8
DOI	https://doi.org/10.5281/zenodo.6141554
persistent identifier	https://treatment.plazi.org/id/AF67D207-FFC3-FFAA-FF14-FB32FF23A7D8
treatment provided by	Plazi
scientific name	Eunice annulicirrata Miura, 1986
status

Treatment

Eunice annulicirrata Miura, 1986 View in CoL

Fig. 2 View FIGURE 2

Eunice annulicirrata Miura, 1986: 295 View in CoL –297, figs 22–23.— Imajima 2007: 316, fig. 90a–p.

Material examined. Taiwan: One specimen ( NMNS 2572-112), Wunzihkeng (25°02´31˝N, 121°55´47˝E), New Taipei, rocky intertidal, March 12, 1989; one specimen ( NMNS 2572-117), Houbihu Fish Port (21°57´26˝N, 120°45´32˝E), Pingtung County, subtidal hard-bottom, 4 m deep, July 25, 1989; one specimen ( NMNS 6990-2), Bali (25°10´17˝N, 121°24´02˝E), New Taipei city, subtidal hard-bottom, 31 m deep, August 8, 2011.

Description. Incomplete specimen (NMNS2572-112), sex unknown, total body length 51 mm, with 82 chaetigers; maximum width at chaetiger 23, about 2.9 mm; length through chaetiger 10, about 5.6 mm; chaetiger 10 width, about 2.3 mm.

Prostomium distinctly shorter and narrower than peristomium, less than 1/2 as deep as peristomium, prostomial lobes anterior round, dorsally inflated separated by deep median and transverse sulcus, giving fourlobes appearance ( Fig. 2 View FIGURE 2 A–B). Eyes present, situated posteriorly to base of palps, rounded and black. Prostomial palps and antennae arranged in semicircle, almost evenly spaced, similar in thickness; palpophores and ceratophores ring-shaped, without articulations; palpostyles and ceratostyles tapering, with articulations; median antenna (A-II) 28 articulations, left antenna (A-I) 27 articulations, right antenna (A-III) 17 articulations, left palp 10 articulations, right palp 12 articulations; A-II to chaetiger 6, A-I and A-III to chaetiger 5, palps reaching middle posterior peristomium. Peristomial cirri long and tapering, reaching over middle peristomium, with articulations ( Fig. 2 View FIGURE 2 A–B).

Maxillary formula: 1+1, 5+7, 8+0, 4+10, 1+1; MxIII long, partially covered by MxII ( Fig. 2 View FIGURE 2 C); mandibles flat ( Fig. 2 View FIGURE 2 D).

Branchiae present, pectinate, distinctly longer than dorsal cirri ( Fig. 2 View FIGURE 2 E), first present on chaetiger 5 and finish on chaetiger 82; branchial filament bimodal distribution, chaetiger 5 with single filament, reaching maximum 13 filaments between chaetiger 10 to chaetiger 13, chaetiger 7 to 23 with over 10 filaments, median body reduced to 3 to 4 filaments, increases to 6 filaments at chaetiger 73 to chaetiger 82. Branchial filaments as long as dorsal cirri, tapering ( Fig. 2 View FIGURE 2 F).

Anterior neuropodial acicular lobes distally rounded; aciculae emerging above midline; prechaetal lobes low, transverse folds, postchaetal lobes truncate. First 6 to 7 ventral cirri bases without inflation, digitiform; median thick, swollen laterally, bases slightly inflated, posterior ventral cirri short, digitiform, without inflation. Dorsal cirri tapering, with articulations ( Fig. 2 View FIGURE 2 E–F).

Limbate chaetae elongate, longest of all chaetae, marginally serrated ( Fig. 2 View FIGURE 2 G). Pectinate chaetae furled, flaring, marginal teeth heterodont, 12 inner teeth ( Fig. 2 View FIGURE 2 H). Shafts of compound falcigers distally inflated, beaklike, marginally serrated; appendages tapering, bidentate, proximal tooth sharp triangle, about perpendicular to axis of appendage, smaller than distal tooth on anterior segments, about equal to distal tooth on posterior segments; distal tooth scimitar-shaped; both proximal and distal tooth directed laterally ( Fig. 2 View FIGURE 2 I); guards marginally serrated, without mucros; pseudo-compound falcigers and compound spinigers absent. Aciculae yellow, straight, distally tapering and rounded, cross-sections rounded, two per chaetiger ( Fig. 2 View FIGURE 2 J); separation between core and sheath indistinct in both aciculae and subacicular hooks. Subacicular hooks yellow, tridentate, present from chaetiger 25 to last chaetiger, single per chaetiger; shafts of hooks straight, subdistally tapering; proximal tooth triangle, distally blunt, directed laterally, distinctly larger than the other two teeth; distal tooth triangle, directed laterally; guards covering only proximal tooth, internal striations present ( Fig. 2 View FIGURE 2 K).

Remarks. Eunice annulicirrata is assigned to the C-2 group (sensu Fauchald 1970). It is characterized by having: 1) moniliform prostomial antennae and palps, 2) bimodal distribution of branchial filaments, 3) the presence of moniliform dorsal cirri, and 4) tapering and distally rounded aciculae ( Miura 1986: 294–297, figs 22–23). The present specimens agree well with the original description.

Eunice annulicirrata View in CoL was previously recorded from scattered locations at Tsuji-shima, Amakusa and Oki Island, Japan ( Miura 1986; Imajima 2007). The present study extends its known distribution southward to near 22°N.