Aulacoseira stevensiae sp nov (Coscinodiscophyceae, Bacillariophyta), a new diatom from Ho Ba Be, Bac Kan Province, Northern Viet Nam

作者：Weide D Marie^*

来源：Diatom Research, 2015, 30(3): 263-268.

DOI：10.1080/0269249X.2015.1074114

• separation spine
• Ringleiste
• karst
• Aulacoseira subborealis
• centric diatom

A new species of Aulacoseira Thwaites is described from piston core samples from Ho Ba Be in the karst region of northern Viet Nam. Although it closely resembles Aulacoaseira subborealis (Nygaard) Denys, Muylaert & Krammer, A. stevensiae Weide sp. nov. is designated a new species based mainly on morphological differences in the spines, including invariably inclined spines that are rounded, differences in the Ringleiste, areola pattern and overall size. Aulacoseira stevensiae is present throughout a core that spans the last 500 years. It was a major component of the diatom community, but the populations have recently decreased, possibly being outcompeted by Discostella Houk & Klee and Cyclotella (Kutzing) Brebisson species.

• 出版日期2015-7-3