Aulacoseira huguang sp. nov., a new Lateglacial fossil diatom from South China Author He, Wenyu Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China. & College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China. Author Rioual, Patrick 0000-0001-9491-91977 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China. & CAS Center for Excellence in Life and Paleoenvironment, Beijing, China. & prioual @ mail. iggcas. ac. cn; https: // orcid. org / 0000 - 0001 - 9491 - 91977 prioual@mail.iggcas.ac.cn Author Luo, Hai Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China. & College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China. Author Li, Jingjing 0009-0003-8605-7533 School of Earth Sciences and Resources, China University of Geosciences, Beijing, China. & Lijingjing @ cugb. edu. cn; https: // orcid. org / 0009 - 0003 - 8605 - 7533 Lijingjing@cugb.edu.cn Author Wang, Luo 0000-0003-2217-8478 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China. & wangluo @ mail. iggcas. ac. cn; https: // orcid. org / 0000 - 0003 - 2217 - 8478 wangluo@mail.iggcas.ac.cn text Phytotaxa 2023 2023-12-07 629 3 223 234 https://phytotaxa.mapress.com/pt/article/download/phytotaxa.629.3.4/51344 journal article 281315 10.11646/phytotaxa.629.3.4 ad26a454-5300-4330-bbb0-adfeb80f3abd 1179-3163 10281851

TABLE 1. Morphological features of Aulacoseira huguang and the three most similar species.

	A. huguang	A.pusilla	A.subborealis	A. stevensiae
References	This study	(Tuji & Houki 2004, Potapova 2010)	(Denys et al., 2003)	(Weide 2015)
Type locality	South China	Japan	Denmark	Vietnam
Distribution	Known only from the type locality	Japan, North America	Western Europe, Australia	Known only from the type locality
Mantle height(µm) Diameter(µm)	2.1–3.2 3.9–6.2	2–4 5.5–9	2.5–4 5.5–9	2–3.85 3.5–7.0
Ratio mantle height/ diameter	0.44–0.75	0.6–0.9	0.39–0.55	0.4–0.55
Pervalvar rows of areolae (in 10 µm)	14–20	23–28	23–28	22–30
Areolae on valve face	Over entire surface, smaller in the centre	Over entire surface. Irregularly spaced	Over entire surface, placed in a more or less radial pattern	Diminishing in size towards the centre
Spine type	Conical	Simple, fairly stout	Conical, rather thick (L/W - 2.5)	Conical, inclined spines
Pervalvar ribs at base of spines	2	2	2	2
Rimoportula number	2	1-4	1(?)	n/a
Rimoportula position	Sessile on ringleist, at opposite places on the perimeter of the valve.	Very long, form a ring inside the ringleist	stout, on ringleist	Not described