Symplectoscyphus vanhoe

Peña Cantero, A. L., 2002, Species of Symplectoscyphus Marktanner-Turneretscher, 1890 (Cnidaria: Hydrozoa, Sertulariidae) from recent Antarctic expeditions with R. V. Polarstern, with the description of four new species, Journal of Natural History 36, pp. 1509-1568 : 1556-1560

Symplectoscyphu s vanhoe V eni Totton, 1930

(gure 15; table 14)

Sertularella subdichotoma: VanhöVen, 1910: 326 , gure 41a–e.

Symplectoscyphus vanhö V eni Totton, 1930: 187, gure 38a–d; Briggs, 1938: 31; Leloup, 1974: 47, gure 39; Blanco, 1982: 40; 1984: 36–37, pl. 30, gures 67, 68.

Sertularella vanhoe V eni: Naumov and Stepan’yants, 1972: 34, 40, gure 4; Stepan’yants, 1972: 70; 1979: 77, pl. 17, gure 5.

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Symplectoscyphus vanhoe V eni: Peña Cantero, 1991: 150–153, pl. 25; Branch and Williams, 1993: 13, gure; Vervoort, 1993: 241; Bouillon, Massin and Kresevic, 1995: 74.

? Symplectoscyphus vanhoe V eni: Ralph, 1961: 817, gure 19a–c.

Sertularella vanhoe V eni: Naumov and Stepan’yants, 1962: 82 (in part).

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Material examined. ANT I-2 Stn 213, a stem fragment ca 25 mm long (RMNH- Coel. 29 200, slide 4845); ANT II-4 Stn 310, a mass of stems ca 25 mm diameter, with immature gonothecae (RMNH-Coel. 29 201, slide 4846); ANT VIII-5 Stn 16-399, a mass of stems and branches ca 15 mm diameter (RMNH-Coel. 29 202, slide 4847); ANT VIII-5 Stn 16-407, a few stems on bryozoans and tubes of benthic organisms, and a mass of stems ca 10 mm diameter (RMNH-Coel. 29 203); ANT VIII-5 Stn 16-434, a mass of branches ca 20 mm diameter (RMNH-Coel. 29 204, two slides 4848); ANT VIII-5 Stn 16-454, fragment 12 mm long (RMNH-Coel. 29 205, slide 4849); ANT VIII-5 Stn 16-475, a mass of stems and branches ca 60 mm diameter, with gonothecae (RMNH-Coel. 29 206, three slides 4850); ANT VIII-5 Stn 16-486, a mass of stems ca 30 mm diameter, with gonothecae (RMNH-Coel. 29 207, slide 4851); ANT VIII-5 Stn 16-492, a few fragments up to 30 mm long, with gonothecae (RMNH-Coel. 29 208, slide 4852); ANT VIII-5 Stn 16-496, a mass of stems ca 30 mm diameter, with gonothecae (RMNH-Coel. 29 209, slide 4853); ANT

2014 IX- with 3 S Stn. glacialis 179, a (mass Jäderholm of stems, 1904 ca) 50, two mm slides, with 4854 gonothecae]. [RMNH-Coel. 29 181,

February stem plane Description .. Branching Branches. forming irregular Mass-shaped anastomosing, though colonies sometimes up stolons to 50 with. mm tendency diameter for, without arrangement distinct in main one

13 Stem and branches divided into internodes by weakly marked, oblique nodes

38 alternating in opposite directions (gure 15A). One hydrotheca per internode.

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Hydrothecae almost cylindrical, strongly abcaudally directed (gure 15B–H).

at Hydrotheca adnate to internode for approximately half its length, though usually

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where adnate it portion becomes longer free. than Free free portion part. of Adcauline adcauline wall hydrothecal with a distinct wall slightly in exion convex point of or straight. Abcauline wall concave. Cusps of hydrothecal aperture blunt and separ-

University ing ated neck Gonothecae a by bearing pattern shallow of the ovoid embayments seven gonothecal, to inserting ten rings aperture (gure at. hydrothecal Gonotheca 15 (B – gure H). 15 Species provided I base).. Gonothecal with with dark a distal coloured wall funnel-shaped folded coenosarc, form-.

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by Remarks. After re-examining the type material of Symplectoscyphus subdicho-

Downloaded free identi tomus Instead described portion (ed, Kirchenpauer Totton from by of Vanhö the the considered ‘ adcauline Terra V, en 1884 (Nova’ 1910), VanhöTotton hydrothecal) collection as Ven’s (Kirchenpauer’s 1930 material): wall reached S. vanhoe is shorter conspeci the species V eni conclusion. in According c did S with. subdichotomus not that a belong species to the Totton material newly there than the. in S. vanhoe V eni. Moreover, the gonothecae have no free frills and the gonothecal aperture is situated at the end of a very short and wide tube.

Stepan’yants (1979) assigned to Symplectoscyphu s vanhoe V eni material with much larger hydrothecae. Though it is possible that in Stepan’yants’ material S. vanhoe V eni was present, it possibly also included other species. Stepan’yants (1979) also pointed out that the record of S. vanhoe V eni from New Zealand (cf. Ralph, 1961) is probably based on a misidenti cation.

Ecology and distribution. Symplectoscyphu s vanhoe V eni has been found at depths from 6 (Naumov and Stepan’yants, 1972) to 385 m (VanhöVen, 1910). Our material comes from depths of 80–390 m. It has been collected on muddy bottoms and bottoms of shingle ( Totton, 1930), bottoms mainly of small rocks (Briggs, 1938), and bottoms of gravel, gravel and mud, and stony bottoms (Naumov and Stepan’yants, 1972). We found it on muddy and rocky bottoms, and on bottoms composed of fragments of Bryozoa .

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Symplectoscyphus vanhoe V eni has been found epibiotic on seaweeds (Naumov and Stepan’yants, 1972), hydroids and Bryozoa ( Totton, 1930; Naumov and Stepan’yants, 1972) and polychaete tubes ( Totton, 1930); we observed it on Bryozoa. Stepan’yants (1979) pointed out that it is used as substratum by other hydroids. Stepan’yants (1979) found fertile colonies from January to March and from July to December, and Totton (1930) reported gonothecae in colonies collected in January. In the Polarstern material fertile colonies were collected in January and February.

Symplectoscyphus vanhoe V eni seems to have a circum-Antarctic distribution (Peña Cantero and Garcóa Carrascosa, 1995). It has been reported from both East and West Antarctica. In the former, S. vanhoe V eni is known from oV Cape Adare and McMurdo Sound, in the Ross Sea ( Totton, 1930), Davis Sea (VanhöVen, 1910; Briggs, 1938; Stepan’yants, 1972, 1979), Sea of the Cosmonauts (Stepan’yants, 1979) and Adélie Land (Naumov and Stepan’yants, 1972). In West Antarctica, it is known from Low Island, in the South Shetland Islands area (Blanco, 1984) and Laurie Island, in the South Orkney Islands (Peña Cantero and Garcóa Carrascosa, 1995). Our material comes from the south and east coasts of the Weddell Sea (oV Ronne Ice Shelf, Riiser-Larsen Ice Shelf, McDonald Ice Rumples, Lyddan Island, Cape Norvegia, Atka Iceport and Fimbul Ice Shelf).