Amaeana

Nogueira, João Miguel De Matos, Carrerette, Orlemir & Hutchings, Pat, 2015, Review of Amaeana Hartman, 1959 (Annelida, Terebelliformia, Polycirridae), with descriptions of seven new species, Zootaxa 3994 (1), pp. 1-52 : 8-9

Key for the identification of species of Amaeana

1. Up to 10 pairs of notopodia.............................................................................. 2

- More than 10 pairs of notopodia.......................................................................... 8

2. Short achaetous gap between termination of notopodia and beginning of neuropodia, less than 5 segments, much shorter than region with notopodia.................................................................................. 3

- Achaetous gap between termination of notopodia and beginning of neuropodia with at least 5 segments, about as long as region with notopodia or longer in most species................................................................... 4

3. Long buccal tentacles spatulate ( Fig. 2 E); 10 pairs of notopodia, on segments 3–12; neuropodia with 7–8 spines each............................................................................................. Amaeana trilobata

- Long buccal tentacles with blunt to pointed tips after subdistal swelling ( Fig. 4 A–B, D–F); 9 pairs of notopodia, on segments 3–11; neuropodia with 5–6 spines each............................................. Amaeana breviachaeta sp. nov.

4. Neuropodia with up to 3 spines each, at most................................................................ 5

- Neuropodia with at least 4–5 spines each................................................................... 7

5. Both rows of notochaetae with acicular chaetae ( Fig. 9 I–J)..................................................... 6

- Both rows of notochaetae with pinnate chaetae ( Fig. 6 A–B)................................ Amaeana hsiehae sp. nov.

6. Distally sharp neuropodial spines ( Fig. 9 K).................................................... Amaeana apheles

- Basally bulbous, distally truncate neuropodial spines ( Fig. 13 H–I)..................... Amaeana crassispinulata sp. nov.

7. Achaetous gap between termination of notopodia and beginning of neuropodia with 8 segments; neuropodia with 4–5 spines each............................................................................ Amaeana angulus sp. nov.

- Achaetous gap between termination of notopodia and beginning of neuropodia with 5 segments; neuropodia with ~8–11 spines each........................................................................ Amaeana ellobophora sp. nov.

8. Long buccal tentacles highly specialised, not spatulate........................................................ 9

- Highly specialised buccal tentacles absent, long tentacles spatulate or unknown (missing on type material).............. 11

9. Achaetous gap between termination of notopodia and beginning of neuropodia, with more than 20 segments; neuropodia each with numerous spines, ~13 on anterior abdominal segments, ~8 posteriorly....................... Amaeana occidentalis

- Achaetous gap between termination of notopodia and beginning of neuropodia with ~8–10 segments; neuropodia throughout with 1–3 spines each.................................................................................. 10

10. Twelve pairs of notopodia; neuropodia with 1–2 spines each...................................... Amaeana yirrarn

- Eleven pairs of notopodia; neuropodia with 2–3 spines each........................... Amaeana brasiliensis sp. nov.

11. Achaetous gap between termination of notopodia and beginning of neuropodia consisting of more than 10 segments; neuropo- dia with 4–5 spines each...................................................... Amaeana dampierensis sp. nov.

- Achaetous gap between termination of notopodia and beginning of neuropodia consisting of less than 10 segments; neuropodia with ~8 spines each................................................................... Amaeana accraensis

Figures

FIGURE 2. Amaeana trilobata, NMO C 3208: A – C, anterior end, dorsal, right lateral and ventral views, respectively; arrow in C points to first neuropodium. D, mid-abdominal segments, left lateral view. E, buccal tentacles. F, anterior end, right lateral view; arrows point to nephridial / genital papillae. G – I, close ups of the anterior end, ventral, right lateral and dorsal views, respectively. J, mid-abdominal segments, right lateral view; arrows point to neuropodia with protruding spines. Numbers refer to segments; ll = lower lip, P = basal part of prostomium; PP = mid-dorsal prostomial process; ul = upper lip; P * = distal part of prostomium. Scale bars: A = 0.8 mm; B, E – F = 0.5 mm; C = 0.7 mm; D, H, J = 0.4 mm; G = 0.3 mm; I = 0.2 mm.

FIGURE 4. Amaeana breviachaeta sp. nov., holotype AM W. 46526. A – B, incomplete worm, right ventro-lateral and left dorso-lateral views, respectively. C – D, anterior end, right ventro-lateral and left dorso-lateral views, respectively; arrows point to last notopodium. E – F, close ups of the anterior end, left dorso-lateral and ventral views, respectively. G, transition between thorax and abdomen; upper arrow points to last notopodium, lower arrow points to first neuropodium. Numbers refer to segments; ll = lower lip, P = basal part of prostomium; ul = upper lip; * = distal part of prostomium. Scale bars: A – B = 0.4 mm; C – D, G = 0.3 mm; E – F = 0.2 mm.

FIGURE 6. Amaeana hsiehae sp. nov., holotype ASIZW 0000935. A – B, progressively closer views of the notochaetae of segment 6; C – E, neurochaetae, segments 21 and two consecutive posterior ones, respectively. Scale bars: A = 30 µm; B = 15 µm; C – E = 7 µm.

FIGURE 9. Amaeana apheles, holotype AM W. 5239. A – C, anterior end, dorsal, right ventro-lateral, and ventral views, respectively. D – F, closer views of the anterior end, left and right ventro-lateral, and ventral views, respectively; arrows point to nephridial / genital papillae. G – H, close ups of the anterior end, dorsal and ventral views, respectively. Specimen AM W. 29203: I – J, notochaetae, segment 9. K, neurochaetae, posterior segment. Numbers refer to segments; ll = lower lip, P = basal part of prostomium; PP = mid-dorsal prostomial process; ul = upper lip; P * = distal part of prostomium. Scale bars: A = 0.7 mm; B – C = 1 mm; D – F = 0.5 mm; G – H = 0.3 mm; I – K = 20 µm.

FIGURE 13. Amaeana crassispinulata sp. nov., holotype AM W. 47365. A – D, anterior end, left and right lateral, ventral and dorsal views, respectively. E – F close ups of the anterior end, ventral and dorsal views, respectively. G, notochaetae, segment 6. H, anterior neuropodium. I, posterior neuropodia. Numbers refer to segments; ll = lower lip, P = basal part of prostomium; ul = upper lip; * = distal part of prostomium. Scale bars: A – D = 0.2 mm; E = 0.15 mm; F = 0.1 mm; G – H = 10 µm; I = 20 µm.