Inferiolabiata lowei (Cairns, 1983)

Cairns, Stephen D. & Zibrowius, Helmut, 2013, Stylasteridae (Cnidaria, Hydrozoa, Filifera) from South Africa, Zootaxa 3691 (1), pp. 1-57 : 12

publication ID

https://doi.org/ 10.11646/zootaxa.3691.1.1

publication LSID

lsid:zoobank.org:pub:E98CE6DF-AF3B-4AAA-95CB-8ACD615C9FCC

DOI

https://doi.org/10.5281/zenodo.5619731

persistent identifier

https://treatment.plazi.org/id/955B87C9-A17E-DD2C-FF22-FE36F37A28DD

treatment provided by

Plazi

scientific name

Inferiolabiata lowei (Cairns, 1983)
status

 

Inferiolabiata lowei (Cairns, 1983) View in CoL

Figs. 1 View FIGURE 1 D, 6A–M, 24

Errina labiata: Boschma & Lowe, 1969: 15 , pl. 5, map 2.

Errina (Inferiolabiata) lowei Cairns, 1983a: 113 –117, figs. 22F–G, 28A–G.

Inferiolabiata lowei: Cairns, 1983b: 428 , 451 (listed); 1991: 41, 43, pl. 25f–g, 26a–f.—Cairns et al., 2009: 97 (listed).

Types and Type Locality. The type series is housed primarily at the NMNH, with vouchers also deposited at Naturalis Biodiversity Centre and BM (see Cairns 1983a). Type Locality: 54°29’S, 39°22’W (west of South Georgia), 659– 686 m.

Material Examined. PF 907, 1 female colony, ex SAM 1489; MN SM185, 1 small fragment, SAM, and SEM stubs 1670–71, 1714 (USNM); type series.

Description (based on the larger South African specimen from PF907). The colony ( Fig. 1 View FIGURE 1 D) is robust, uniplanar, and sparsely branched, not hosting a commensal polychaete. It measures 3.7 cm tall and 8.9 mm in basal branch diameter, having a somewhat flattened terminal branch 6 mm in greater width. The coenosteal texture is reticulate-imbricate, often covered with a dense smooth material on the upper parts of the corallum ( Fig. 6 View FIGURE 6 C); the corallum is white.

Gastropores are equally distributed on all branch surfaces, circular in shape, and 0.35–0.40 mm in diameter. The gastrostyle is elongate and quite slender, only 0.11–0.14 mm in diameter, the proximal portions sometimes stabilized by tabulae ( Fig. 6 View FIGURE 6 K, M). A rudimentary diffuse ring palisade occurs in the upper gastropore tube, composed of globular elements about 35 µm in height. Because of the slender nature of the gastrostyle and the rudimentary ring palisade, there is ample space surrounding the style within the gastropore tube. Although the ring palisade is visible from an apical view of the gastropore, the gastrostyle tip is slightly recessed below the coenosteal surface. The abcauline dactylopore spines ( Figs. 6 View FIGURE 6 F–H) are up to 0.6 mm tall and 0.35–0.40 mm wide, in all cases the dactylotome occupying the entire length of the dactylopore spine (i.e., not proximally tubular). The exterior surface of the dactylopore spines is longitudinally ridged and spinose ( Fig. 6 View FIGURE 6 E), and their distal edges are finely serrate; they are invariably independent, not grouped in abcauline crescents. Most dactylopore spines have multiple (1–3), rudimentary dactylostyles ( Figs. 6 View FIGURE 6 G–J), the elements ranging from 35–45 µm in height.

The superficial female ampullae are 1.1–1.2 mm in diameter, although efferent pores were not observed.

Comparisons. See Comparisons of I. africana and Cairns (1991: Table 4) for comparisons of all species in this genus.

Remarks. The single South African specimen compares favorably with the South American type series, but differs in having slightly shorter dactylopore spines (those of the type series may be up to 1 mm), having a rudimentary ring palisade (those of the type series have none), and in having consistently independent, horseshoeshaped dactylopore spines, whereas those from the type series sometimes have their spines arranged in crescents beneath the gastropores and are occasionally cylindrical proximally, not unlike the conditions found in I. africana . The South African specimen was also collected from slightly shallower than those from off South America and New Zealand.

Distribution. South Africa, continental shelf off Eastern Cape Province (Fig. 24), 90–155 m; Southwest Atlantic, off southern Argentina, Tierra del Fuego, Burdwood Bank, South Georgia, and Drake Passage, 250–960 m; New Zealand region, southern Norfolk Ridge, Three Kings Ridge, southwestern South Island, 164–751 m (Cairns 1991).

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