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FIGURES 12−20. C. violaceus, mouthparts: 12−13, photographs of mandibular tusks (different specimens from Santa Fé, showing morphological variations), dorsal view; 14−15, mandibular tusks, d.v. (basal U-row of filtering setae omitted); 16−17, hypopharynx, ventral and lateral view; 18−19, maxilla, ventral and oclusal view; 20, labium, lateral view. Abbreviations: bg=basal gill; d=denticles; st=subbasal tubercle; s=stout spine-like setae.