Bougainvilliidae, Lutken, 1950

Soto, Joan J. & Peña, Álvaro L., 2019, Benthic hydroids (Cnidaria, Hydrozoa) from the Weddell Sea (Antarctica), Zootaxa 4570 (1), pp. 1-78 : 9-10

publication ID

https://doi.org/ 10.11646/zootaxa.4570.1.1

publication LSID

lsid:zoobank.org:pub:EF369E98-EBD9-4647-B081-65AD1794A27C

DOI

https://doi.org/10.5281/zenodo.5934879

persistent identifier

https://treatment.plazi.org/id/03B887B7-A466-FFFB-E983-F97CFAEB9CB2

treatment provided by

Plazi

scientific name

Bougainvilliidae
status

 

Bougainvilliidae undetermined

( Fig. 2 View FIGURE 2 d–e)

Material examined. ANT XVII/3: 111-9, one stem, c. 5 mm high, with gonophores; 111-19, some stems, up to 8 mm high, on Schizotricha unifurcata Allman, 1883 and Symplectoscyphus weddelli Peña Cantero, Svoboda & Vervoort, 2002 , with gonophores; ANT XXI/2: PS65/39, some stems, up to 3 mm high, on Symplectoscyphus exochus Blanco, 1982 ; PS65/248, some stems, up to 10 mm high, on Halecium incertus Naumov & Stepanjants, 1962 , Stegella lobata ( Vanhöffen, 1910) and Symplectoscyphus curvatus ( Jäderholm, 1917) , with gonophores; PS65/280, few stems, up to 3 mm high; PS65/336, one stem, c. 3 mm high, on Symplectoscyphus glacialis ( Jäderholm, 1904) .

Remarks. Despite being abundant and fertile, the material examined does not agree with any of the bougainvillids reported from Antarctic waters. It has great resemblance with the syntypes of Bougainvillia macloviana Lesson, 1830 , re-described by Peña Cantero (2015), in colony and polyp shape, presence of pseudohydrotheca ( Fig. 2d View FIGURE 2 ), and type and size of nematocysts (see below). However, the present material has clearly identifiable fixed sporosacs ( Fig. 2e View FIGURE 2 ), with up to seven eggs, that arise from a large perisarc cup which rim is not well defined. In contrast, B. macloviana produces free medusae, and the gonophores originate from a welldefined, smaller, cup-shaped pedicel of perisarc ( Peña Cantero 2015, p. 373).

Cnidome composed by heteronemes [range 5.5–7.0 x 3.5–4.0 µm, mean 6.2±0.4 x 3.6±0.2 µm (n=29)] and desmonemes [range 3.0–3.5 x 2.0–2.5 µm, mean 3.3±0.3 x 2.3±0.3 µm (n=24)].

Ecology and distribution. Material examined collected at depths from 62 to 287 m off Cape Norvegia.

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