Pinnularia austroshetlandica Cleve-Euler 1948

• Main Authors: Zidarova, Ralitsa, Kopalová, Kateŕina, Vijver, Bart Van De
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2012
• Subjects: Biodiversity; Taxonomy; Chromista; Bacillariophyta; Bacillariophyceae; Naviculales; Naviculaceae; Pinnularia; Pinnularia austroshetlandica; Elephant Seal; Livingston Island
• Online Access: https://doi.org/10.5281/zenodo.4929579; http://treatment.plazi.org/id/03F2686FFF85924F42EBFE6DFEA09733

Pinnularia austroshetlandica (Carlson 1913: 16, pl. 1, fig. 25) (Figs 181–188) Synonymy :— Pinnularia kolbei Manguin (in Bourrelly & Manguin 1954: 35) non P. kolbei Mölder (1952: 27), P. parakolbei Fukushima, Ko-Bayashi & Yoshitake (Fukushima et al. 2001: 108), P. bottnica Krammer (2000: 78) sensu Van de Vijver et al. (2002), Navicula nivorum Peragallo (1921: 20), Navicula nivorum var. elongata Peragallo (1921: 20). Valves broadly elliptic-lanceolate with clearly convex margins and protracted, rostrate ends. Valve dimensions (n = 25): length 32–42 µ m, width 9.7–11.3 µm. Axial area linear to linear-lanceolate, narrow, slightly widening towards the central area. Central area a large, bow-tie-shaped fascia. Raphe filiform with weakly curved branches. Central raphe endings deflected to the secondary side with large, almost triangular-shaped, central pores. Terminal fissures bent to one side, opposite to the central endings. Striae geniculate, radiate near the centre, becoming convergent near the valve ends, 13–15 in 10 µm. Longitudinal lines absent. Habitat:— The species is rather rare on Livingston Island. On Hurd Peninsula, it was found relatively abundantly in only one sample taken from a Sanionia georgico-uncinata vegetation, growing around a periodically drying shallow brook close to the sea. On Byers Peninsula, the species was more common. The largest population was found on wet soil close to the sea with a clear presence of elephant seal input (Van de Vijver, pers. obs.). The species seems to prefer more aerial circumstances influenced by biogenic input such as penguin rookeries and elephant seal wallows (Van de Vijver et al. 2002). Observations:— There is much confusion about the correct taxonomic identity of Pinnularia austroshetlandica . In 1954, Manguin (in Bourrelly & Manguin 1954) described a new species of Pinnularia he named P. kolbei . The name kolbei had already been used by Mölder (1952: 27; see Fukushima et al. 2001: 107) making a new name for Manguin’s species necessary; Fukushima et ...