Glycera onomichiensis Izuka, 1912

Böggemann, Markus, 2015, Glyceriformia Fauchald, 1977 (Annelida: “ Polychaeta ”) from Lizard Island, Great Barrier Reef, Australia, Zootaxa 4019 (1) : -

Glycera onomichiensis Izuka, 1912

( Figs 4 , 10 C)

Glycera onomichiensis Izuka, 1912: 244 ; pl. 24, figs 10–12. Synonyms see Böggemann 2002

Material Examined. AM W.46213, Lizard Island, 600 m south-west of Research Point, coarse to medium sand, 4.5 m, 10 Oct 1978, cs/5.5/52/1.0/0.7; AM W.46142 (3), Lizard Island Group, Blue Lagoon, 3 m, 24 Jul 1979, cs/ 10/72/1.4/1.0, af/12/81/1.5/1.0, af/7.5/52/1.4/1.0; AM W.47219, cs/16/106/2.0/1.3, part of proboscis on SEM stub; AM W.46144, Blue Lagoon, 6 m, 24 Jul 1979, cs/15/85/1.7/1.0, cs/14/87/1.3/0.7, cs/13/78/1.7/1.1, cs/13/76/1.3/ 0.8, af/16/74/1.9/1.1, af/15/71/2.0/1.2, af/12/65/1.9/1.1, af/5/32/1.4/0.8; AM W.47220, Lizard Island lagoon, 24 Jul 1979, cs/14/85/2.0/1.2, part of proboscis on SEM stub; AM W.46222 (2), Lizard Island Group, fringing reef between Bird Islet and South Island, mixed algae and sediment from seagrass beds at reef base, 24.4–37.6 m, 9 Oct 1978, cs/32/126/4.0/2.9, cs/20/108/2.0/1.3.

Diagnosis. Proboscidial papillae mainly with terminal fingernail structure with long stalk and some longitudinal ridges on nail; ailerons with pointed triangular bases; parapodia of mid-body with two slender triangular postchaetal lobes of about same length; branchiae absent.

Description. Body up to 32 mm long with up to 126 chaetigers. Mid-body segments bi-annulate.

Conical prostomium consisting of about 10–13 rings; terminal ring with four appendages and basal one with pair of nuchal organs ( Fig. 4 A).

Proboscis with three types of papillae: 1. numerous papillae with terminal fingernail structure on posterior surface, with long stalk and some longitudinal ridges on nail; 2. less numerous and slightly shorter digitiform papillae; 3. isolated, broader, more conical papillae without ridges ( Figs 4 B, 10C). Terminal part of proboscis with four hook-shaped jaws arranged in a cross and accessory ailerons with pointed triangular base ( Fig. 4 C).

First two pairs of parapodia uniramous; following parapodia biramous ( Fig. 4 D–K). Two slender triangular to digitiform prechaetal lobes of about same length; both lobes becoming slightly thinner in posterior parapodia; in last parapodia notopodial lobe shorter than neuropodial one. Two shorter postchaetal lobes; anteriorly both lobes rounded, neuropodial lobe slightly longer than notopodial lobe; in following parapodia both lobes elongated and slender triangular, of about same length; in posteriormost parapodia both lobes generally shorter and more rounded. Dorsal cirri from 3rd parapodium, conical to oval; inserted on body wall slightly above parapodial base. Ventral cirri slender triangular to digitiform, about as long as postchaetal lobes; in posterior parapodia slender and elongated; in last parapodia about as long as neuropodial prechaetal lobe; situated medio-ventrally on parapodia. Branchiae absent.

Noto- and neuropodia each with a single acicula ( Fig. 4 D–K). Notochaetae capillaries. Neurochaetae compound spinigers with blades of different lengths.

Pygidium with dorsal anus and terminal pair of slender, elongated cirri.

Distribution. Lizard Island Group; 3–37.6 m.

Figures

FIGURE 4. Glycera onomichiensis Izuka, 1912, AM W. 46222. A; Anterior end with partly everted proboscis, dorsal view; B. Proboscidial papillae; C. Aileron; D – K. Anterior to posterior parapodia, posterior view, aciculae suggested, chaetae omitted.

FIGURE 10. Proboscidial papillae of Glycera spp. A. Glycera brevicirris, AM W. 44482; B. Glycera cf. lapidum, AM W. 46201; C. Glycera onomichiensis, AM W. 47220; D. Glycera sagittariae, AM W. 47221; E. Glycera tesselata, AM W. 45499; F. Glycera tridactyla, AM W. 47222.