A consideration of some interesting freshwater gomphonemoid diatoms from North America and China, and the description of Gomphosinica gen. nov.

作者：Kociolek, J. P.; You, Q-M; Wang, Q-X^*; Liu, Q.

来源：Nova Hedwigia, 2015, 175-198.

DOI：10.1127/nova_supp1/2015/0038

• Taxonomy
• China
• USA
• biogeography
• Systematics
• electron microscopy
• Gomphosinica
• Gomphoneis
• Gomphonema
• new genus
• new species

We investigate freshwater gomphonemoid diatoms from Xinjiang and Sichuan Provinces, China, and from Glacier National Park, Montana, and compare their morphology to species in two different genera, Gomphonema hedinii Hustedt and Gomphoneis geideri Kociolek & Stoermer. These species resemble each other in the light microscope by having a relatively large, round, distinct stigma, costate striae and apical pore fields that appear like condensed striae. We describe 3 new species from Xinjiang Province, and 4 new species from Montana, based on shape, size and valve morphology. With SEM, the species all possess an internal stigma opening that has a hooded cover with small openings. The apical pore fields, like the rounded areolae, are arranged in more or less double rows, and are not physically separated from the striae. Based on the unique suite of features, we describe a new genus, Gomphosinica, and compare and contrast it with other freshwater gomphonemoid diatoms including Gomphoneis and Gomphonema. We propose a phylogenetic hypothesis detailing the synapomorphies found in the different groups of freshwater gomphonemoid diatoms. The disjunct distribution of this genus between Asia and western North America and the upper Laurentian Great Lakes is detailed, and this pattern of distribution is compared with other groups of organisms that exhibit similar patterns.

• 出版日期2015
• 单位上海师范大学