Lafoea dumosa ( Fleming, 1820 )

Watson, Jeanette E., 2018, Some Hydroids (Cnidaria, Hydrozoa) from the Great Australian Bight in the collection of the South Australian Museum, Zootaxa 4410 (1), pp. 1-34 : 3-5

Lafoea dumosa ( Fleming, 1820)

Figure 1F–G

Sertularia dumosa Fleming, 1820: 83 .

Campanularia dumosa . — Fleming, 1828: 548.

Lafoea dumosa . — Clark, 1877: 216, pl. 12, fig. 23.— Hutton, 1904: 319.— Fraser, 1911: 51.— Billard, 1912: 464.— Stechow, 1913: 30.— Totton, 1930: 158, fig. 14.— Kramp, 1935: 123, figs 52a, 53.— Fraser, 1944: 221, pl. 45, fig. 205, pl. 46, fig. 205.— Naumov, 1960: 276, fig. 165.— Vervoort, 1968: 100.— Millard, 1980: 131.— Hirohito, 1983: 6, 21.— Cornelius & Ryland, 1990: 135, fig. 4.13.— Cornelius, 1992: 254, 257.— Hirohito, 1995: 126, fig. 36a–c, pl. 8, fig. A.— Schuchert, 2001: 67, figs 54 A–D, 55, 56.— Calder, 2012: 28, fig. 27.— Vervoort & Watson, 2003: 62, fig. 8 E–H.—Watson, 2003: 157, fig. 7A–E.— Bouillon et al, 2006: 340, fig. 160 G–I.

Campanularia fruticosa M. Sars, 1850: 131 , 138.

Campanularia gracillima Alder, 1856: 361 , pl. 14, figs 5–6.

Lafoea capillaris G.O. Sars, 1874: 115 , pl. 4, figs 4–5.

Lafoea elegantula Broch, 1903: 5 , pl. 1, figs 5–6, pl. 2, figs 7–9.

Lafoea gracillima . — Ralph, 1958: 310, figs 1y, 2a–c.

Material examined. SAM H2340, preserved material; two microslides ( SAM H2570, H2571). West of the South Australia-Western Australia border, depth 180 m, trawl; coll: R. Southcott 1/07/1988.

Description. Fragmented tangled fertile colony 20 mm high, stems to 90 mm long and 0.46 mm wide at base with some hydrorhizal fragments. Colonies arborescent with several orders of branching, many branches intergrown. Stem and most branches fascicled, polysiphonic tubes becoming monosiphonic on ultimate branches.

Hydrothecal pedicels variable in length, triserially arranged along branch, distance between pedicels variable. Hydrotheca long, cylindrical, base of same diameter as pedicel, hydrotheca straight to slightly curved, walls smooth, diaphragm distinct, straight to concave, margin circular, some rims slightly everted, some with one or two replications.

Coppinia muff-like, surrounding stem and branches, to 1.5 mm long x 0.35 mm wide, comprising a tightly packed circle of flask-shaped gonothecae with narrow cylindrical neck and everted rim, protective tubules long, scattered around coppinia, some with a trumpet-shaped distal orifice.

Stem

distance between successive hydrothecae 200–320 width of monosiphonic branch 112–120 Hydrotheca

maximum width of pedicel 48–80 length, diaphragm to margin 480–560 diameter at margin 160–192 Coppinia

length of gonotheca 440–520 distal width of gonotheca at shoulder 112–208 length of tubule 140–220 maximum width of tubule 64–80 Remarks. The material is flaccid and the branches are complexly intergrown and entangled. It generally agrees with the description of Watson (2003) of Lafoea dumosa from Macquarie Island.

Distribution. A widely distributed deep water species, previously recorded in the Australasian region from Macquarie Island and New Zealand. This is the first record from the Great Australian Bight.

FIGURE 1 A–H.

1A, Acryptolaria gracilis ( Allman, 1888) , part of colony showing alternate corrugated hydrothecae, margins damaged. 1B–E, Cryptolaria tortuosa sp. nov. B, photograph of preserved holotype colony (H2332). C, branch. D, part of monosiphonic branch. E, hydrotheca, lateral view. F, nematotheca (C–F drawn from preserved material in temporary Berlese mountant). 1G–H, Lafoea dumosa ( Fleming, 1820) . G, part of branch with hydrothecae. H, gonothecae.