Glycera sagittariae McIntosh, 1885

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

Glycera sagittariae McIntosh, 1885

( Figs 5 , 10 D)

Glycera sagittariae McIntosh, 1885: 346 ; pl. 42, fig. 8; pl. 22A, fig. 10.

Material examined. AM W.45468, MI QLD 2444 (2), cs/9/88/0.9/0.5, cs/7/66/0.9/0.5; AM W.47221, MI QLD 2444, af/13/92/2.5/1.5, part of proboscis on SEM stub; AM W.46214, Lizard Island, 100 m off eastern end of Mangrove Beach, undulating sand, filamentous algae, 3 m, 11 Oct 1978, cs/52/192/2.0/1.4, part of proboscis on SEM stub.

Diagnosis. Proboscidial papillae mainly conical with 3 ridges; ailerons with triangular bases; parapodia of mid-body with rounded, sometimes slightly blunt triangular postchaetal lobes, notopodial lobes usually slightly broader and longer than neuropodial lobes; simple, retractile, digitiform branchiae, situated medially on anterior side of parapodia.

Description. Body up to 52 mm long with up to 192 chaetigers. Mid-body segments bi-annulate.

Conical prostomium consisting of about 11–12 rings; terminal ring with four appendages and basal one with pair of nuchal organs ( Fig. 5 A).

Proboscis with two types of papillae: l. numerous conical papillae with 3 U-shaped ridges, sometimes with additional subterminal straight, median, longitudinal ridge; 2. isolated, broader, oval to globular papillae without ridges ( Figs 5 B, 10D). Terminal part of proboscis with four hook-shaped jaws arranged in a cross and accessory ailerons with triangular base ( Fig. 5 A, C).

First two pairs of parapodia uniramous; following parapodia biramous ( Fig. 5 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; in following parapodia both lobes slightly elongated and rounded, sometimes slightly blunt triangular; notopodial lobe usually slightly longer than neuropodial lobe; in posteriormost parapodia both lobes generally shorter and 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 medioventrally on parapodia. Branchiae retractile, simple, digitiform ( Fig. 5 F); starting in anterior region to near posterior end; situated medially on anterior side of parapodia.

Noto- and neuropodia each with a single acicula ( Fig. 5 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; 3– 24 m.

Figures

FIGURE 5. Glycera sagittariae McIntosh, 1885, AM W. 47221 (A), AM W. 46214 (B – K). A. Anterior end with everted proboscis, dorsal view; B. Proboscidial papillae; C. Aileron; D – K. Anterior to posterior parapodia; F: anterior view, D – E, G – K: 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.