TABLE 1 in Aulacoseira huguang sp. nov., a new Lateglacial fossil diatom from South China

TABLE 1. Morphological features of Aulacoseira huguang and the three most similar species.
A. huguangA.pusillaA.subborealisA. stevensiaeReferencesThis study(Tuji & Houki 2004, Potapova 2010)(Denys et al., 2003)(Weide 2015)Type localitySouth ChinaJapanDenmarkVietnamDistributionKnown only from the type localityJapan, North AmericaWestern Europe, AustraliaKnown only from the type localityMantle height(µm) Diameter(µm)2.1–3.2 3.9–6.22–4 5.5–92.5–4 5.5–92–3.85 3.5–7.0Ratio mantle height/ diameter0.44–0.750.6–0.90.39–0.550.4–0.55Pervalvar rows of areolae (in 10 µm)14–2023–2823–2822–30Areolae on valve faceOver entire surface, smaller in the centreOver entire surface. Irregularly spacedOver entire surface, placed in a more or less radial patternDiminishing in size towards the centreSpine typeConicalSimple, fairly stoutConical, rather thick (L/W - 2.5)Conical, inclined spinesPervalvar ribs at base of spines2222Rimoportula number21-41(?)n/aRimoportula positionSessile on ringleist, at opposite places on the perimeter of the valve.Very long, form a ring inside the ringleiststout, on ringleistNot described