Leitoscoloplos bifurcatus (Hartman, 1957)

Zhadan, Anna, 2020, Review of Orbiniidae (Annelida, Sedentaria) from Australia, Zootaxa 4860 (4), pp. 451-502 : 466

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https://doi.org/ 10.11646/zootaxa.4860.4.1

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Leitoscoloplos bifurcatus (Hartman, 1957)


Leitoscoloplos bifurcatus (Hartman, 1957) View in CoL

Figure 8 View FIGURE 8

Haploscoloplos bifurcatus Hartman, 1957: 277–279 View in CoL .

Leitoscoloplos bifurcatus: Day 1977: 223–224 View in CoL ; Hutchings & Rainer 1979: 760–761; Mackie 1987: 13–14, fig. 14a–f; Zhadan et al., 2015: 786 View Cited Treatment , figs 5, 6.

Material examined. Northern Territory: Darwin Harbour, Mandorah , 12°26’54”S, 130°45’56”E, 06.07.1993, muddy sand, coll. P.A. Hutchings, AM W.25435, 1 specimen GoogleMaps . Queensland: Lizard Island, August 2013: off Casuarina Beach , 14°40’46”S, 145°26’49”E, snorkeling, depth 0.5 m, sand, seagrass, coll. K. Meissner, N. Budaeva, A. Murray, AM W.46089, 1 specimen GoogleMaps ; off Casuarina Beach , 14°40’46”S, 145°26’49”E, intertidal, fine sand, coll. M GoogleMaps . Capa, J. Parapar, Q. Parapar, M. T. Aguado, AM W.44299, 2 specimens ; Casuarina Beach , 14°40’46”S, 145°26’49”E, intertidal, sand, coll. P.A. Hutchings, P. Rodgers, J. Zanol Silva, N. Budaeva, AM W.44761, 4 specimens GoogleMaps ; Mangrove Beach , 14°40’47”S, 145°27’44”E, intertidal, sand, coll. N. Budaeva, T. Alvestad, AM W.44938, 1 specimen GoogleMaps . New South Wales: Towlers Bay, Pittwater , 33°37’30”S, 151°17’E, April 1992, depth 12 m, coll. C.L. Rose, fine mud, AM W.24101, 5 specimens GoogleMaps ; Port Hacking, Artificial Reef , 08.01.1975, 34°04′S, 151°08′E, AM W.43442, 1 specimen GoogleMaps ; east of Marley , 34°08’05” S, 151°09’39” E, 31.07.1989, sand, depth 60 m, coll. Fisheries Research Institute ( NSW), AM W.24302, 1 specimen GoogleMaps ; Bass Point , 34°36’S, 150°54’E, 01.02.1990, Smith-McIntyre Grab, depth 50 m, coll. The Ecology Lab for RMI/ Pioneer Project, AM W.22967, 1 specimen GoogleMaps .

Type locality. Encounter Bay , South Australia .

Description. Body cylindrical, thorax wider than abdomen, slightly flattened in posterior part; abdomen cylindrical. Thoracic width 2–4.4 mm ( Fig. 8A, B View FIGURE 8 ). Prostomium sharply conical. Peristomium bearing pair of dorsolateral nuchal organs. Thoracic chaetigers numbering 18–22 ( Fig. 8A, B, D View FIGURE 8 ). Branchiae from chaetiger 8 as minute papillae, becoming prominent from chaetiger 16; in abdomen digitate-triangular, shorter or equal to notopodial lobes in anterior abdomen, becoming 1.5–2 times longer than notopodia in posterior abdomen ( Fig. 8B, E, F, G View FIGURE 8 ). Thoracic postchaetal lobes developed from first chaetiger, gradually increasing in size, narrow triangle, equal size or neuropodia longer in anterior thorax, notopodia lobes longer in middle and posterior thorax ( Fig. 8 View FIGURE 8 A–D). Neuropodial lobes becoming bilobed from chaetiger 10–12 ( Fig. 8A, C, D View FIGURE 8 ). No subpodal or stomach papillae. Abdominal notopodial lobes digitate, triangular; neuropodia bilobed with inner lobe longer than outer, with two dark aciculae ( Fig. 8 View FIGURE 8 D–G). Subpodal notch and flange present. No flange papillae. Chaetae crenulate capillaries in all parapodia, abdominal notopodia also bearing forked chaetae ( Fig. 8H View FIGURE 8 ). Pygidium with two anal cirri.

Distribution. Australia, Northern Territory, Queensland, New South Wales, Victoria, South Australia.

Habitat. Intertidal and upper subtidal, sand, mud, seagrass.

Remarks. Leitoscoloplos bifurcatus was described from South Australia and later reported from Victoria, New South Wales, Queensland, and the Northern Territory ( Hutchings & Rainer 1979). Recently, this species was redescribed and illustrated based on specimens from Lizard Island, Queensland ( Zhadan et al. 2015). The specimens investigated in the present study generally are consistent with previous descriptions; forked chaetae in abdominal notopodia are noted for the first time here. Leitoscoloplos bifurcatus is similar to S. dayi regarding general appearance, shape of thoracic neuropodia, and the first segment with branchiae. The differences between these two species are listed with the account for S. dayi (above).


Australian Museum


Tavera, Department of Geology and Geophysics


Royal Botanic Gardens, National Herbarium of New South Wales












Leitoscoloplos bifurcatus (Hartman, 1957)

Zhadan, Anna 2020

Leitoscoloplos bifurcatus: Day 1977: 223–224

Zhadan, A. & Stupnikova, A. & Neretina, T. 2015: 786
Mackie, A. S. Y. 1987: 13
Hutchings, P. & Rainer, S. 1979: 760
Day, J. H. 1977: 224
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