Leitoscoloplos bilobatus Mackie, 1987

Zhadan, Anna, 2020, Review of Orbiniidae (Annelida, Sedentaria) from Australia, Zootaxa 4860 (4), pp. 451-502 : 468-469

Leitoscoloplos bilobatus Mackie, 1987

Figure 9

Leitoscoloplos bilobatus Mackie, 1987: 13 , fig.13a–d.

Material examined. New South Wales: North Head, Port Jackson, 33°49’ 30”S, 151°18’E, 25.05.1972, Australian Museum Shelf Benthic Survey , depth 30 m, Holotype, AM W.199516; east of Malabar , 33°58’34”S, 151°16’52”E, 17.04.1989, coll. Fisheries Research Institute ( NSW), sand, depth 60 m, AM W.20694; 2 specimens.

Type locality. Port Jackson, North Head , New South Wales .

Description. Holotype with thoracic width 1.6 mm, two other specimens 0.9 mm and 1.2 mm, body length about 23 mm, about 140 chaetigers ( Fig. 9A, D ). Prostomium sharply conical ( Fig. 9D ). Thorax flattened, abdomen cylindrical; 13–15 thoracic chaetigers ( Fig. 9A, B, D ). Branchiae from chaetigers 12–13 as small triangle papillae, then gradually increasing in size, in abdomen branchiae becoming digitate and triangular with round tips, shorter than notopodial lobes ( Fig. 9D, E, H ). Thoracic postchaetal lobes small papilliform on anterior segments, then gradually increasing in size, becoming triangular; notopodial lobes longer than on neuropodia; no subpodal or stomach papillae ( Fig. 9B, C, G ). Abdominal notopodial lobes narrow, foliaceous ( Fig. 9E, H, I ). Abdominal neuropodial postchaetal lobes bilobate, with both lobes well developed; inner lobe longer and wider than outer ( Fig. 9C, E, H, I ). No subpodal notch and flange. Pygidium with two anal cirri ( Fig. 9F ). All parapodia bearing crenulate capillaries, abdominal notopodia with forked chaetae ( Fig. 9G, H, I ).

Distribution. Australia, New South Wales.

Habitat. Subtidal, sand, sandy mud.

Remarks. The specimens described in the present study correspond with the description by Mackie (1987). Leitoscoloplos bilobatus differs from the other species of the genus by the absence of a subpodal notch and subpodal flange in the abdominal neuropodia.

Figures

FIGURE 9. Leitoscoloplos bilobatus, A–F: stereomicroscope, methylene blue staining; G–I: compound microscope. A. AM W.199516 (holotype), general view; B. AM W.20694, anterior end, lateral view; C. AM W.199516 (holotype), transition between thorax and abdomen, lateral view; D. AM W.20694, anterior part, dorsal view; E. AM W.199516 (holotype), abdominal parapodia, dorso-lateral view; F. AM W.20694, posterior end with regenerating pygidium, ventro-latero-posterior view; G. AM W.20694, parapodium of chaetiger 5; H. AM W.20694, abdominal parapodium; I. AM W.20694, close up view of abdominal parapodia. a, acicula; br, branchia; cc, crenulated capillaries; ne, neuropodium; no, notopodium.