Gastromyzon ridens group ^ZBK

Diagnosis.-This species group is defined by a truncate head when viewed dorsally (except for G. ridens ^ZBK, which has a rounded head); sublacrymal groove distinctively visible on lateral part of snout; anterior area of snout with slight depression and densely covered with tubercles; a vertical gill slit; absence of a subopercular groove; absence of a secondary rostrum; absence of a postoral pouch; and absence of scales on abdomen.