Leodamas johnstonei ( Day, 1934 )

Zhadan, Anna, 2020, Review of Orbiniidae (Annelida, Sedentaria) from Australia, Zootaxa 4860 (4), pp. 451-502 : 477

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Leodamas johnstonei ( Day, 1934 )


Leodamas johnstonei ( Day, 1934)

Figure 14 View FIGURE 14

Scoloplos johnstonei Day, 1934: 58–60 , fig.1l a–e.

Scoloplos (Leodamas) johnstonei: Hartman 1957: 290 ; Day 1967: 550, fig. 23.5 k–o; Day 1977: 231–232.

Scoloplos (Leodamus) uniramus Day 1961: 477–479 , fig. 1g–o; Day, 1967: fig. 23.6. a–f.

Material examined. New South Wales: Akuna Bay, Hawkesbury River , 33°38’36”S, 151°14’12”E, November 1991, coll. C.L. Rose, depth 13.4 m, fine mud, AM W.24102, 5 specimens GoogleMaps ; Burwood Beach , 32°37’S, 151°44’E, AM W.8889, 1 specimen GoogleMaps .

Type locality. St. James , South Africa .

Description. All specimens incomplete. Small worms, thoracic width 0.5–0.9 mm. Body long and slender, thorax flattened, abdomen cylindrical ( Fig. 14A View FIGURE 14 ). Prostomium conical, long, sharply pointed ( Fig. 14A, C View FIGURE 14 ). Thoracic chaetigers numbering 15–24. Branchiae from chaetiger 6, trianglular with tapering tips; in abdomen becoming narrow digitiform ( Fig. 14 View FIGURE 14 C–F). Thoracic notopodial postchaetal lobes developed from chaetiger 4, narrow digitate, in abdomen retaining same shape, equal or slightly shorter than branchiae ( Fig. 14 View FIGURE 14 A–E). Thoracic neuropodial postchaetal lobes weakly developed, as low ridges; posterior thoracic neuropodia with podal papillae; first podal papilla appearing in upper part of neuropodial ridge, last thoracic neuropodia with two podal papillae, in upper and lower part ( Fig. 14A, B View FIGURE 14 ). Subpodal papillae developed on posterior thoracic and anterior abdominal segments. Last thoracic chaetiger bearing three papillae in total ( Fig. 14B View FIGURE 14 ). Abdominal neuropodia bilobed, with outer lobe cirriform, inner lobe short and round ( Fig. 14 View FIGURE 14 D–F). First 10–15 abdominal parapodia with cirriform subpodal papillae, anterior segments with two papillae, following with one ( Fig. 14B View FIGURE 14 ). Notopodia with crenulate capillaries throughout, also with forked chaetae in abdominal segments ( Fig. 14G View FIGURE 14 ). Thoracic neuropodia with four to five rows of curved uncini; in first four rows similar in size and shape; fifth row shorter, only in lower part of neuropodia, uncini thinner and less curved ( Fig. 14B View FIGURE 14 ). Single capillaries present in upper and middle part of posterior row only on few posterior thoracic neuropodia ( Fig. 14B View FIGURE 14 ). Abdominal neuropodia with one stout almost straight acicula with blunt tip and bundle of capillaries and flail chaetae with sharp transition to very thin arista ( Fig. 14E, F View FIGURE 14 ). Abdominal notopodia with capillaries and forked chaetae ( Fig. 14G View FIGURE 14 ).

Distribution. South Africa ( Day 1934), Australia, Queensland, New South Wales, Victoria.

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

Remarks: Leodamas johnstonei was originally described from South Africa as Scoloplos johnstonei . Hartman (1957) transferred this species to the subgenus Leodamas . She erroneously stated the absence of podal and subpodal lobes (papillae). Later, Day described a similar species that was also described from South Africa, S. (L.) uniramus . This species differed from L. johnstonei owing to the uniramous shape of the abdominal neuropodia, smaller number of thoracic chaetigers, slenderer notopodial lobes and branchiae, and presence of flail chaetae in the abdominal neuropodia. An investigation of the Australian material showed that these two species were synonymous ( Day 1977). The present study confirms the presence of flail chaetae in the Australian specimens of L. johnstonei . The shape of the abdominal neuropodia is biramous with a reduced inner lobe, which is typical for Leodamas species. However, whether the Australian and South African specimens belong to the same species needs to be confirmed.


Australian Museum












Leodamas johnstonei ( Day, 1934 )

Zhadan, Anna 2020

Scoloplos (Leodamas) johnstonei

Day, J. H. 1977: 231
Day, J. H. 1967: 550

Scoloplos (Leodamus) uniramus

Day, J. H. 1961: 479

Scoloplos johnstonei

Day, J. H. 1934: 60