Halecium pseudodelicatulum Cantero, 2014, sp. nov.

• Main Author: Peña Cantero, Álvaro L.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2014
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Leptothecata; Haleciidae; Halecium; Halecium pseudodelicatulum; Antarc*; Antarctic
• Online Access: https://doi.org/10.5281/zenodo.3510556; http://treatment.plazi.org/id/3E6287E02955FF932CA91F543D7DFD9A

Halecium pseudodelicatulum sp. nov. (Figs 2 C–D, 10A, 11) Halecium delicatulum — Peña Cantero & Vervoort, 2009: 85, fig. 1d, e; Peña Cantero, 2013: 128, fig. 3D. ? Halecium delicatulum — Peña Cantero, 2008: 454–555, fig. 1a; 2010: 766, fig. 4a. ? Halecium antarcticum — Galea & Schories, 2012b: 7 –9, fig. 2E, H. Material examined. Spanish Antarctic Expedition Bentart 2006 : Stn Low 44 , numerous polysiphonic stems forming a dense mass c. 80 mm high, with female gonothecae (Holotype, MNCN 2.03/444, Museo Nacional de Ciencias Naturales, Madrid, Spain, one stem c. 70 mm high, with female gonothecae; remaining material paratypes). Stn Low 45 , several polysiphonic stems, up to 60 mm high, with male gonothecae, on bryozoans. Diagnosis. Polysiphonic, irregularly branched stems, up to 70 mm high. Branches originating from hydrophore of primary hydrotheca. Hydrothecae alternately arranged in one plane. Hydrotheca at the end of long, free hydrophore distinctly directed adcaudally and provided with pseudodiaphragm. Hydrotheca distinctly widening distally; rim everted. Up to sixth-order hydrothecae. Female gonotheca bivalve-shaped, both abcauline and adcauline walls of similar development. Aperture all distal part, from the widest part upwards. Male gonotheca of similar shape, but much smaller. Cnidome consisting of microbasic mastigophores? and microbasic euryteles?. Description. Massive colony (Fig. 10 A) composed of polysiphonic stems up to 70 mm high, densely growing together. Branching irregular and in several planes. Stem and branches divided into internodes by alternately arranged oblique nodes (Fig. 11 A–B, D). Hydrothecae alternately arranged in one plane and placed at the end of long hydrophores (Fig. 11 A–D); ratio between adcauline length of hydrophore and diameter at diaphragm 1.1–1.4. Hydrophores distinctly directed adcaudally. Abcauline side of hydrophore straight or with a slight basal convexity; adcauline side usually forming a clear concavity (Fig. 11 C). Hydrothecae surpassing considerably distal ...