Halecium pseudoincertus Cantero, 2014, sp. nov.
Halecium pseudoincertus sp. nov. (Figs 10 B, 12) Halecium incertus — Peña Cantero, 2008: 454 –455, fig. 1b; 2009: 1747; 2012: 857. Material examined. Spanish Antarctic Expedition Bentart 95 : Stn 22R , two stems, up to 90 mm high, on pebbles; Stn 31A , one stem, c. 110 mm high. Spanish Antarctic Exp...
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| Format: | Other/Unknown Material |
| Language: | unknown |
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Zenodo
2014
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| Online Access: | https://doi.org/10.5281/zenodo.4630897 http://treatment.plazi.org/id/3E6287E02951FF912CA91A253D1AFC10 |
| Summary: | Halecium pseudoincertus sp. nov. (Figs 10 B, 12) Halecium incertus — Peña Cantero, 2008: 454 –455, fig. 1b; 2009: 1747; 2012: 857. Material examined. Spanish Antarctic Expedition Bentart 95 : Stn 22R , two stems, up to 90 mm high, on pebbles; Stn 31A , one stem, c. 110 mm high. Spanish Antarctic Expedition Bentart 2006 : Stn 34 , a stem, c. 165 mm high (Holotype, MNCN 2.03/445, Museo Nacional de Ciencias Naturales, Madrid, Spain), and a stem, 75 mm high (Paratype), basibiont of Stegopoma plicatile Stn 34-2 , a distal stem fragment, c. 43 mm long. New Zealand Antarctic Expedition TAN0402 : Stn 232 , one stem, c. 310 mm high; Stn 277 , one stem, c. 75 mm high, on gravel. Diagnosis. Long and thin, polysiphonic, mainly unbranched stems, up to 310 mm high. Stem giving rise every third hydrotheca and alternately in two planes to monosiphonic branches at distal part. Branches originating from hydrophore of primary hydrotheca, monosiphonic, unbranched or with up to two secondary branches. Hydrothecae alternately arranged in two planes. Hydrotheca at the end of short, mostly adnate hydrophore provided with a strongly marked pseudodiaphragm. Hydrotheca distinctly widening distally; rim everted. Adcauline hydrothecal wall free; distinctly larger than abcauline one. Hydrothecal aperture directed downwards. Up to five-order hydrothecae present. Gonothecae unknown. Cnidome consisting of isorhizas, larger microbasic euryteles?, smaller microbasic euryteles and microbasic mastigophores. Description (Holotype). Stem polysiphonic, except for last 17 mm, mostly unbranched (Fig. 10 B), tortuous and relatively long (c. 165 mm high) and thin (c. 1 mm at basal part). Stem distally provided with 16 primary branches and eight secondary ones. Branching regular, alternate at every third hydrotheca in two planes, forming an obtuse angle of c. 90° in distal part of stem (where branches are present). Probably, angle slightly larger at basal part. Length of lateral branches decreasing upwards. Branches monosiphonic, unbranched, or with a ... |
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