Goniada echinulata Grube, 1870

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

Goniada echinulata Grube, 1870

( Figs 13 , 17 A–D)

Goniada echinulata Grube, 1870: 67 . Synonyms see Böggemann 2005

Material examined. AM W.47203, MI QLD 2441, af/8/45/0.9/0.5, part of proboscis on SEM stub; AM W.47207, MI QLD 2440, af/14,5/81/0.9/0.4; AM W.47216 (2), Watsons Bay, 400 m off Chinaman's Ridge, filamentous algae, 12 m, 13 Oct 1978, af/13/58/1.1/0.7, pf/12.5/62/1.0/0.6; AM W.46211, Watsons Bay, 1000 m off Chinaman's Ridge, seagrasses, 12 m, 13 Oct 1978, af/22/98/1.0/0.6, pf/2.5/18/0.6/0.3; AM W.46208, Lizard Island Group, 250 m east-south-east of Palfrey Island, south end of lagoon, very fine sticky sediment, 12 m, large hand-held corer from SCUBA, 12 Oct 1978, af/14/68/1.0/0.5; AM W. 46209, 250 m east-south-east of Palfrey Island, south end of lagoon, very fine sticky sediment, 12 m, large hand-held corer from SCUBA, 12 Oct 1978, af/22/113/1.0/0.5;

Diagnosis. Proboscis with different types of papillae, conical papillae with distal beaks and basally with two long stilts; 10–20 pairs of chevrons; 29–46 uniramous chaetigers, following biramous; notochaetae capillaries, neurochaetae compound spinigers.

Description. Body up to 25.5 mm long with up to 120 chaetigers. Segments uni-annulate, but median part of dorsum sometimes appears to be bi-annulate.

Conical prostomium consisting of about 8–9 rings; terminal annulus with four biarticulate appendages and basal one with pair of nuchal organs. Pair of basal subdermal eyes may be present ( Fig. 13 A).

Proboscis on distal part with longer conical papillae with distal beaks and basally with two long stilts ( Fig. 17 A–B); other papillae more heart-shaped. Macrognaths quadri- to hexadentate; 2–4 H+v/w-shaped dorsal and 2–3 (usually three) H+v/w-shaped ventral compound micrognaths, dorsal arc additionally always with four slightly larger, simple rod-like micrognaths in outer position and between other ones. 16–20 chevrons on each side of proboscis; basal chevrons distinctly smaller than distal ones ( Fig. 17 C–D).

First chaetigers with only one neuropodial pre- and one postchaetal lobe ( Fig. 13 B); second, lower prechaetal lobe developed from chaetiger 12–13; both prechaetal lobes digitiform, upper one slightly longer and broader than lower one; conical to triangular postchaetal lobe always distinctly shorter ( Fig. 13 C). 36–38 uniramous chaetigers, following parapodia biramous with conical notopodial prechaetal lobes and shorter, rounded to conical postchaetal lobes ( Fig. 13 D). From 38th to 41th chaetiger parapodia enlarged and with noto- and neuropodia clearly separated ( Fig. 13 E–G); lobes of about same shape as before; in posterior parapodia notopodial lobes, lower neuropodial prechaetal lobes and neuropodial postchaetal lobes shorter and upper neuropodial prechaetal lobes slightly more slender ( Fig. 13 H–I). Dorsal cirri on anterior chaetigers digitiform, about as long as neuropodial postchaetal lobes ( Fig. 13 B–C); in anterior biramous parapodia slightly longer than notopodial prechaetal lobes ( Fig. 13 D); in enlarged biramous parapodia more conical, about as long as notopodial prechaetal lobes ( Fig. 13 E–G); in posterior parapodia slender, elongated and more digitiform ( Fig. 13 H–I). Ventral cirri in anterior parapodia digitiform, about as long as lower neuropodial prechaetal lobes ( Fig. 13 B–D); in enlarged biramous parapodia more conical, about as long as neuropodial postchaetal lobes ( Fig. 13 E–G); in posterior parapodia slender, elongated and more digitiform, slightly longer than neuropodial postchaetal lobes ( Fig. 13 H–I).

Noto- and neuropodia each with a single acicula ( Fig. 13 B–I). Notochaetae capillaries. Neurochaetae compound spinigers with blades of different lengths.

Pygidium with dorsal anus; cirri not observed.

Distribution. Lizard Island Group; 12–21.2 m.

Figures

FIGURE 13. Goniada echinulata Grube, 1870, AM W. 47216, af (A – F), pf (G – I). A. Anterior end with partly everted proboscis, dorsal view; B – I. Anterior to posterior parapodia, posterior view, aciculae suggested, chaetae omitted.

FIGURE 17. Goniada echinulata, AM W. 47203. A – B. Micrograph (A) and SEM picture (B) of larger, elongated conical papillae with distal beak; C – D. Micrograph (C) and SEM picture (D) of chevrons. Goniada paucidens, AM W. 41212. E – F. Micrograph (E) and SEM picture (F) of heart-shaped papillae; G – H. Micrograph (G) and SEM picture (H) of chevrons.