S. scrobifer, S. parvulus, and S. maravalhas. a S. scrobifer head, full-face view, arrows indicate complete frontal carina and large, convex eye b S. parvulus head, full-face view, arrows indicate incomplete frontal carina and small, almost flat eyes c S. maravalhas, lateral view, arrows indicate lateral and dorsal carinae on gaster d S. parvulus, lateral view, arrow indicates lateral carina on gaster, dorsal carina absent.