Glycera tridactyla Schmarda, 1861

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

Glycera tridactyla Schmarda, 1861

( Figs 7 , 10 F)

Glycera tridactyla Schmarda, 1861: 97 ; pl. 30, fig. 238; textfigs a–b, k. Synonyms see Böggemann 2002

Material examined. AM W.47198, MI QLD 2376 (3), cs/32/113/2.1/1.4, cs/25/121/2.4/1.6. cs/25/116/1.9/1.2; AM W.47199, MI QLD 2422 (12), cs/31.5/122/2.3/1.4, cs/29/117/2.2/1.6, cs/27.5/117/2.2/1.5, cs/22.5/121/1.9/1.3, af/23/ 105/2.2/1.7, af/15/60/2.3/1.7, af/13/51/1.8/1.2, af/11/50/2.0/1.2, mf/4/14/1.9/0.9, pf/15/50/1.7/0.9, pf/10.5/60/2.0/ 1.1, pf/10/36/1.3/0.7; AM W.47202, MI QLD 2429 (7), cs/27/120/2.0/1.3, cs/26/112/1.9/1.2, cs/21/113/2.0/1.4, cs/ 20/111/2.0/1.5, cs/20/108/1.7/1.0, af/25/112/2.0/1.3, af/17/82/1.9/1.2; AM W.44815, MI QLD 2429, af/10.5/48/2.0/ 1.3; AM W.44847, MI QLD 2422, cs/22/118/1.8/1.1; AM W.45847, MI QLD 2422 (6), cs/34/118/2.0/1.3, cs/25.5/ 102/1.5/1.0, cs/24/114/1.9/1.2, cs/23/106/1.3/0.9, af/17/70/1.7/1.2, af/16.5/77/1.6/1.1; AM W.47222, MI QLD 2422 (2), af/20.5/71/1.8/1.1, af/17/71/1.9/1.2; AM W.45848, MI QLD 2429 (few), cs/25.5/120/2.0/1.3, cs/23/117/2.0/1.5, cs/18/93/1.9/1.1; AM W.28585, Lizard Island, 100 m off eastern end of Mangrove Beach, medium sand, 3 m, small hand-held corer from SCUBA, 30 Sep 1978, cs/36/119/2.0/1.4; AM W. 46215, 100 m off eastern end of Mangrove Beach, undulating sand, filamentous algae, 3 m, 11 Sep 1978, cs/31/114/1.8/1.0; AM W. 46216, 100 m off eastern end of Mangrove Beach, undulating sand, filamentous algae, 3 m, 11 Sep 1978, cs/37/125/3.0/2.3, part of proboscis on SEM stub; AM W. 46217, 100 m off eastern end of Mangrove Beach, undulating sand, filamentous algae, 3 m, 11 Sep 1978, cs/35/113/2.2/1.5; AM W.28587, Lizard Island Group, lagoon entrance between Bird Islet and Trawler Beach, fine sand bottom with many mounds & hollows, 15.2 m, 5 Oct 1978, af/9/ca.34/ca.2.2/ca.1.4, mf/10/26/2.7/ 1.8, pf/19/50/2.1/1.6; AM W.46210 (several), Lizard Island Group, halfway between Mangrove Beach and South Island, fine sediment, 10 m, small hand-held corer from SCUBA, 30 Sep 1978, cs/26/101/1.7/1.1, af/29/92/1.8/1.2, af/10/38/1.5/1.0; AM W.47223, same, af/24/84/2.2/1.7, part of proboscis on SEM stub; AM W.47209, Lizard Island Group, Blue Lagoon, 3 m, 24 Jul 1979, cs/7/62/1.0/0.7; AM W.46212 (several), Lizard Island Group, 250 m eastsouth-east of Palfrey Island, south end of lagoon, very fine sticky sediment, 12 m, human dredge by hand from SCUBA, 12 Oct 1978, cs/45/121/2.4/1.5, cs/24/108/1.6/1.0, af/26/99/2.0/1.4, af/11/43/1.9/1.3.

Diagnosis. Proboscidial papillae mainly with terminal fingernail structure with short stalk and same longitudinal ridges on nail; ailerons with triangular bases; parapodia of mid-body with slender triangular notopodial and shorter, more or less rounded neuropodial postchaetal lobes; simple, digitiform branchiae, situated termino-dorsally on parapodia, from anterior to near posterior end.

Description. Body up to 45 mm long with up to 125 chaetigers. Mid-body segments bi-annulate.

Conical prostomium consisting of about 13–15 rings; terminal ring with four appendages and basal one with pair of nuchal organs ( Fig. 7 A).

Proboscis with three types of papillae: 1. numerous papillae with terminal fingernail structure on posterior surface, with short stalk and some longitudinal ridges on nail; 2. less numerous and slightly shorter conical papillae; 3. isolated, broader, oval to globular papillae without ridges ( Figs 7 B, 10F). Terminal part of proboscis with four hook-shaped jaws arranged in a cross and accessory ailerons with triangular base ( Fig. 7 C).

First two pairs of parapodia uniramous; following parapodia biramous ( Fig. 7 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 notopodial lobe elongated and slender triangular, distinctly longer than rounded, at first sometimes also slightly blunt triangular neuropodial lobe; notopodial lobe in posterior parapodia slender and elongated; in last parapodia notopodial lobe generally shorter. 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 neuropodial postchaetal lobe; in posterior parapodia slender and elongated; in last parapodia about as long as neuropodial prechaetal lobe; situated medio-ventrally on parapodia. Branchiae non-retractile, simple, digitiform ( Fig. 7 F–J); starting from about 21th to 32nd parapodium to near posterior end; situated termino-dorsally on parapodia; best developed in mid-body region, extending beyond prechaetal lobes.

Noto- and neuropodia each with a single acicula ( Fig. 7 D–K). Notochaetae capillaries. Neurochaetae compound spinigers with blades of different lengths.

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

Remarks. A few specimens with ectoparasitic nematodes on the body and on the parapodia (AM W.47199, AM W.47202).

Distribution. Lizard Island Group; intertidal to 15.2 m.

Figures

FIGURE 7. Glycera tridactyla Schmarda, 1861, AM W. 46216. 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.