FIGURE 4. Test features and spines of <i>Salmacis virgulata</i> (WUSL/ER/89): A, aboral view; B, oral view; C, ambital ambulacrum; D, ambital interambulacrum; E, ambital spines.
Arachchige <i>et al.</i> 2019. An annotated species list of regular echinoids from Sri Lanka with notes on some rarely seen temnopleurids. <i>Zootaxa</i> 4571(1): 35–52.
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