Two new species of Pseudogomphonema (Bacillariophyceae: Naviculales) from King George Island, Antarctica Article

Al-Handal, AY, Sullivan, MJ, Frankovich, TA et al. (2025). Two new species of Pseudogomphonema (Bacillariophyceae: Naviculales) from King George Island, Antarctica . Bulletin of Marine Science, 101(4), 1865-1876. 10.5343/bms.2024.0125

International Collaboration

cited authors

  • Al-Handal, AY; Sullivan, MJ; Frankovich, TA; Wulff, AK

abstract

  • Two new species of marine epiphytic Antarctic diatoms are described based on observations from light and electron microscopy. Pseudogomphonema minutum sp. nov. and Pseudogomphonema gracile sp. nov. were found epiphytic on the rhodophyte Georgiella confluens (Reinsch) Kylin in Peñón Uno, Potter Cove, King George Island, Antarctica. Pseudogomphonema minutum is characterized by small heteropolar gomphonemoid valves with filiform raphe branches that gradually curve onto the mantle, with a complete absence of pseudosepta. The central area of P. minutum sp. nov is wide and reaches the valve margin, and the cingulum is composed of three open bands. Pseudogomphonema gracile is characterized by its coarse striae density, linear, narrow valves, and large quadrangular central area with a pseudoseptum present at the foot pole with evidence of a weakly developed pseudoseptum at the head pole. There are seven open cingular bands in this species. Comparisons with morphologically similar taxa are provided.

authors

publication date

  • October 1, 2025

published in

Digital Object Identifier (DOI)

start page

  • 1865

end page

  • 1876

volume

  • 101

issue

  • 4