Lanice viridis, Nogueira, João Miguel Matos, Hutchings, Pat & Carrerette, Orlemir, 2015

Nogueira, João Miguel Matos, Hutchings, Pat & Carrerette, Orlemir, 2015, Terebellidae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia, Zootaxa 4019 (1), pp. 484-576 : 568-571

Lanice viridis n. sp.

( Figs 3 G–I, 55–59)

Type material. Holotype: NTM W. 023148, 14°44'37"S, 145°30'43"E, 5 m, incomplete, 12 mm long, ~ 1.5 mm wide. Paratype: AM W.44967, MI QLD 2436, mounted on SEM pin; AM W.47714, mounted on 2 SEM pins, AM W.44611, MI QLD 2400 (photographed alive); AM W.47791, MI QLD 2436; AM W.44281, MI QLD 2367 (2); AM W.47738, CReefs, LI–10–062, MacGillivray Reef, deep reef slope, 14°39'25"S, 145°28'22"E; AM W.47739, CReefs, LI–10–009, MI QLD 2187, North Direction Island, 14°44'43"S, 145°30'18"E.

Comparative material examined. Holotype of Lanice bidewa Hutchings & Glasby, 1988 , AM W. 200764. Paratype of Lanice bidewa , AM W. 200687. Holotype of Lanice sinata Hutchings & Glasby, 1990 , AM W.203513. Paratype of Lanice sinata , AM W.203514. Non-types of Lanice sinata , AM W.21846, AM W.21847, AM W.21851, AM W.21862, AM W.21866.

Description. In life, bright green body, with buccal tentacles regularly striped with brown and white bands ( Fig. 3 G–I); brown spots on buccal tentacles frequently visible in preserved material. Transverse prostomium attached to dorsal surface of upper lip; basal part with few eyespots laterally; distal part shelf-like ( Figs 55 C, E–F, I–J, L; 56A, E, K). Buccal tentacles shorter than body, but longer than region with notopodia ( Fig. 3 G–I). Peristomium forming lips, hood-like upper lip, short, circular, densely ciliated; short and swollen lower lip, buttonlike ( Figs 55 A, G, K–L; 56A–B, E, G–I, K). Segment 1 dorsally narrow, with pair of large lobes directed anteriorly and reaching around 2/3 of upper lip length; lobes almost circular, with thinner membrane at tip ventrally, dorsal margins inserted at level of first pair of branchiae; lobes higher laterally to mouth, mid-ventrally indented to partially expose lower lip. Segment 2 reduced, dorsally conspicuous, covered by lobes of segment 3 laterally and fused to it ventrally. Segment 3 with pair of large, rectangular lobes, lateral and distal margins straight, rounded at corners, reaching around mid-length of lobes of segment 1 laterally; lobes with wide bases, ventral edges fused to upper corners of first mid-ventral shield, dorsal margins inserted at level between dorsal edges of neuropodia and line of notopodia; lobes absent from segment 4 ( Figs 3 I; 55A–G, I–L; 56A–B, D–E, G–H, J–K). Anterior segments slightly inflated dorsally. Paired dorso-lateral arborescent branchiae present on segments 2–4, dorsal to line of notopodia, with short branchial filaments branching dichotomously in several levels from secondary stems, and short basal stems; first pair slightly longer, about half body width at segment 2; branchiae inserted progressively more laterally ( Figs 3 G–I; 55B–C, E–G, I–J, L; 56A, C–F, J–L). Trapezoidal mid-ventral shields present from segments 2–14 or 15, those of segments 2–4 almost completely fused into single crenulated structure, following shields progressively smoother, slightly crenulate until last; blood red region on segments 12–15; first 2 shields, on segments 2–3 and 4, much wider than those of following segments, progressively narrowing until segment 10, then of uniform width, indented posteriorly by tori, last shield almost inconspicuous ( Figs 55 A–B, D, G, K; 56B, G–H). Notopodia beginning on segment 4, extending until segment 20; notopodia short, cylindrical to oblong, notopodia of segments 4–7 inserted progressively more laterally, then longitudinally aligned ( Figs 55 A–L; 56A–G, J–K, M; 57A–C). Narrowly-winged notochaetae in both rows throughout, under SEM wings with thin, smooth marginal blade, chaetae of posterior row with wings at distal half ( Figs 57 A–C, E–I; 59A–F). Neuropodia present from segment 5, as low, almost sessile ridges until termination of notopodia, as elongate and thin, rectangular pinnules from segment 21, inserted progressively more ventrally, lateral to mid-ventral groove on posterior segments ( Figs 55 A–E, G–K; 56A–B, D–E, G–H, J–K, M; 57D). Short-handled avicular uncini, arranged in partially intercalated to completely separate double rows, in back to back arrangement, from segment 11 until termination of notopodia, on segment 20; uncini with elongate base, almost inconspicuous dorsal button at mid-length of base, distally pointed prow curved downwards, and crest with 3 rows of secondary teeth, on segments of region with notopodia, 4 rows after notopodia terminate and 5 rows on posterior segments; stouter uncini on first 3 pairs of neuropodia, on segments 5–7, with more teeth per row, and typically 3 teeth on first row above main fang, middle tooth shorter, following segments with shorter and less teeth per row of secondary teeth ( Fig. 57 D); after notopodia terminate, uncini with more teeth per row of secondary teeth ( Figs 58 A–G; 59G–L). Nephridial papillae on segments 2 and 3, between dorsal margins of lobes and branchiae, on segment 3, minute genital papillae on segments 6–8, posterior to notopodia ( Figs 55 L; 56D–E, J–K, M). Pygidium unknown. Tube unknown.

Remarks. Lanice viridis n. sp. closely resembles L. bidewa Hutchings & Glasby, 1988 as both species lack lobes on segment 4, however members of L. bidewa have lobes of segment 3 with narrower bases, extending from the level of notopodia to mid-length of anterior neuropodial tori, while in L. viridis n. sp. the bases of lobes of segment 3 extend from near the level of notopodia to the mid-ventral shield. The tubes of the new species were not retained, so unknown if the opening to the tube is smooth as in L. bidewa , as often species in this genus have ornamented entrances to their tubes.

Etymology. We name this species after the bright green colour of living specimens ( Fig. 3 G–I), from the Latin word “ viridis ” = green .

Type locality. Off North Direction Island, near Lizard Island, GBR, Australia.

Distribution. Known only from the Lizard Island region.

Figures

FIGURE 3. Live specimens. A – C. Loimia pseudotriloba n. sp. AM W. 47810, MI QLD 2336; D – F. Loimia juani n. sp.; D. AM W. 44261, MI QLD 2335; E. AM W. 44518, MI QLD 2381; F. AM W. 44263, MI QLD 2336; G – I. Lanice viridis n. sp. AM W. 44611, MI QLD 2400. Photos: A – I—Alexander Semenov.

FIGURE 55. Lanice viridis n. sp. NTM W. 023148: A – C. Incomplete worm, ventral, left ventro-lateral and right dorso-lateral views, respectively; D – G. Anterior end, ventral, right dorso-lateral (2) and left ventro-lateral views, respectively; H. Transition between anterior and posterior body; I – L. Close ups of the anterior end, right dorso-lateral (2), ventral and dorsal views, respectively; arrows point to nephridial papillae. Numbers refer to segments. Abbreviations: ll = lower lip, ul = upper lip, * = distal part of prostomium. Scale bars: A – C = 1 mm, D – H = 0.5 mm, I, K – L = 0.3 mm, J = 0.4 mm.

FIGURE 57. Lanice viridis n. sp. AM W. 44967: A – C. Notochaetae, segments 6, 17, and 18, respectively; D. Close up of the neuropodia of segments 5 – 8; E – F. Notochaetae of segment 6, chaetae from anterior and posterior rows, respectively; G, I. Notochaetae of segment 18, chaetae from anterior and posterior rows, respectively; H. Notochaetae of posterior row, segment 17. Scale bars: A = 20 µm, B – C = 30 µm, D = 50 µm, E, G – H = 10 µm, F = 4 µm, I = 7 µm.

FIGURE 58. Lanice viridis n. sp. AM W. 44967: A – B. Uncini, segment 5; C – G. Uncini of the segments 7, 8, 11, 14, and 28, respectively. Scale bars: A, E – F = 7 µm, B – D = 5 µm, G = 4 µm.