Amaeana apheles ( Hutchings, 1974 )

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 : 20-24

publication ID

https://doi.org/ 10.11646/zootaxa.3994.1.1

publication LSID

lsid:zoobank.org:pub:093B124E-58AE-4303-8C07-2D7B27E6AC38

DOI

https://doi.org/10.5281/zenodo.6094904

persistent identifier

https://treatment.plazi.org/id/DD7687BB-FFAC-FF8F-FF66-FF62D9C6FE71

treatment provided by

Plazi

scientific name

Amaeana apheles ( Hutchings, 1974 )
status

 

Amaeana apheles ( Hutchings, 1974) View in CoL

Figures 9 View FIGURE 9 , 10 View FIGURE 10 and 11 View FIGURE 11

Lysilla apheles Hutchings 1974: 190 View in CoL –191, Fig. 5 View FIGURE 5 A;— Hutchings 1977: 10 –11;— Hutchings & Murray 1984: 90. Amaeana apheles View in CoL .— Hutchings & Glasby 1986: 321, Figs 1 View FIGURE 1 C–E; 12A.

Material examined. Holotype: AM W.5239: incomplete specimen, with 11 abdominal segments, in excellent state of preservation, 12 mm long, ~ 2.5 mm wide at posterior thorax. Paratypes: AM W.5237: incomplete specimen, in good state of preservation, ~ 14 mm long, ~ 1.8 mm wide. AM W.5238: incomplete specimen in good state of preservation, ~ 15 mm long, ~ 2 mm wide. All type material collected from—Australia, New South Wales, Wallis Lake, 32°17'S, 152°29'E, Dec.1970, coll. by P. Dixon & K. O’Gower, in seagrass beds in shallow water.

Additional material examined. AM W.5384 (Queensland, Mary River, Kangaroo Island, Hervey Bay, 25°25'S, 152°56'E, Dec.1971): 2 specimens, 1 of which complete. AM W.29203 (Queensland, Mary River, Kangaroo Island, Hervey Bay, 25°25'S, 152°56'E, Dec.1971): complete, in excellent state of preservation; slides: notopodium, segment 9; anterior and posterior neuropodia. AM W.10864 ( Australia, Queensland, Nerang River, Gold Coast, 28°6'S, 153°18'E, 1975): mounted on SEM pin. AM W.19333 ( Australia, New South Wales, Hawkesbury River, near Juno Head, 33°34'S, 151°15' E, 12.Jan.1977): mounted on SEM pin.

Type locality. Australia, New South Wales, Wallis Lake, 32°17'S, 152°29'E, shallow water.

Description: Holotype incomplete specimen, 12 mm long, ~ 2.5 mm wide at posterior thorax, maximum width of body; longest specimen examined ~ 15 mm long, ~ 2 mm wide.

Prostomium at base of upper lip, both basal and distal parts developed, basal part as thickened crest, distal part with large, flaring lobes and also short, rounded to squared mid-dorsal process; prostomium covering segment 1 laterally and terminating laterally to lower lip, near mouth ( Figs 9 View FIGURE 9 A–H; 10A–H). Three types of buccal tentacles, short ones thin, uniformly cylindrical; intermediate tentacles distally spatulate, with convolute margins; long buccal tentacles progressively widening towards subdistal cylindrical inflation, collar-like, with relatively long pointed to distally blunt tip, as wide as tentacle basally to collar-like inflation ( Fig. 9 View FIGURE 9 A–H).

Peristomium restricted to lips, upper lip almost circular, usually folded into three lobes; lower lip short, buttonlike, rectangular to crescent-shaped ( Figs 9 View FIGURE 9 A–H; 10A–H).

Body anteriorly swollen, progressively broader until segments 10–11, then of uniform width until segments 19–20, tapering on segments 20–23, and again of relatively uniform width through posterior body, distinctly narrower than anterior segments ( Figs 9 View FIGURE 9 A–H; 10A–F; 11G); achaetous gap between termination of notopodia and beginning of neuropodia, corresponding to segments 12–13 to 21–22 (9–10 segments), twice as long as region with notopodia, with poorly marked segmentation and fragile, with thin body wall dorsally ( Figs 9 View FIGURE 9 B; 10A–C).

Segments biannulated, segment 1 short, visible dorsally and ventrally, laterally covered by expanded prostomium; segment 2 narrower and shorter than following segments, with small, pentagonal mid-ventral shield at beginning of mid-ventral groove, extending anteriorly through segment 1 until near ventral edge of lower lip ( Figs 9 View FIGURE 9 A–H; 10A–H). Ventrum highly glandular, covered on small papillae, arranged on paired ventro-lateral pads on segments 2–12; papillae larger and more numerous on anterior segments, progressively less numerous on segments 11–12, still conspicuous on both parts of each segment ( Figs 9 View FIGURE 9 A–F, H; 10A–B, D–E, H).

Notopodia starting from segment 3 and extending through 10 segments, until segment 12, in holotype, some specimens with 9 pairs of notopodia only; elongate, cylindrical notopodia, with equal sized lobes and elongate, distally blunt tip ( Figs 9 View FIGURE 9 A–I; 10A–G; 11A–B). Notochaetae as nearly alimbate capillaries in both rows, wings not visible under higher magnifications of light microscopy ( Fig. 9 View FIGURE 9 I–J), as short and fine hairs under SEM, closely resembling pinnate chaetae, but with finer hairs in oblique tiers ( Fig. 11 View FIGURE 11 A–E).

Neuropodia present from segments 23–24, laterally to mid-ventral groove, on outer margins of longitudinal crests; neurochaetae as 1–2 thick, distally sharp spines, tips somewhat narrower and slightly hooked ( Figs 9 View FIGURE 9 K; 11F–I).

Nephridial and genital papillae at anterior bases of all notopodia, larger on segments 5–10 ( Figs 9 View FIGURE 9 B, D–E; 10A–B, D–E). Pygidium with rounded ventral papilla.

Remarks. This taxon was originally described as a species of Lysilla , due to the holotype being posteriorly incomplete, with few segments after termination of notopodia, not presenting neuropodia ( Hutchings 1974). Subsequently, complete specimens were found and the species was correctly transferred to Amaeana ( Hutchings & Glasby 1986) .

Members of A. apheles are characterised by having 1–2 stout, distally sharp spines per neuropodium. In contrast to the other species in this genus, members of A. apheles present slight variation on the number of pairs of notopodia present, 9–10 pairs.

Members of A. yirrarn also have 1–2 spines per neuropodium, but these species are distinguished by the latter having 12 pairs of notopodia, instead of 9–10, as in A. apheles . There is also a difference on the extension of the achaetous gap between termination of notopodia and beginning of neuropodia between these species, although with some overlapping, as this gap extends for 7–9 segments in A. yirrarn , and 9–10 in A. apheles .

Besides A. yirrarn , three other species have a number of spines per neuropodium similar to that of A. apheles , A. crassispinulata sp. nov., A. hsiehae sp. nov., and A. brasiliensis sp. nov., all these species described herein. However, those spines are basally wider and distally truncate in A. crassispinulata sp. nov. (see below), tapered, but not as sharp in A. hsiehae sp. nov., described above, and distally blunt or with oblique tip in A. brasiliensis sp. nov.; in addition, this latter. In addition, this latter species also has a different number of pairs of notopodia (see below).

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Terebellida

Family

Terebellidae

Genus

Amaeana

Loc

Amaeana apheles ( Hutchings, 1974 )

Nogueira, João Miguel De Matos, Carrerette, Orlemir & Hutchings, Pat 2015
2015
Loc

Lysilla apheles

Hutchings 1986: 321
Hutchings 1984: 90
Hutchings 1977: 10
Hutchings 1974: 190
1974
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