Character;"External orbital tooth";"Epibranchial tooth";"Cleft between external orbital and epibranchial teeth";Vulva "H. koatenense";"Sharp (Fig. 4A)";"Granular (Fig. 4A)";"Shallow (Fig. 4A)";"Ovate (Fig. 6B)" "H. angulatum (cf. Dai & Ng, 1994: fig. 1)";Sharp;Granular;Shallow;Ovate "H. lichuanense (cf. Dai et al., 1995: fig. 3)";"Acutely sharp";Granular;Shallow;"Widely ovate" "H. lini (cf. Cheng et al., 2008: fig. 1)";"Acutely sharp";Rounded;"Deep, U-shaped";"Widely ovate" "H. yiyangense (cf. Dai et al., 1995: fig. 1)";"Acutely sharp";Rounded;Shallow;Ovate