▁identify ▁the ▁species . ▁In ▁S . ▁gran ulos us , ▁the ▁hum eral ▁process ▁is ▁narrow , ▁long , ▁and ▁rough ▁in ▁appearance , ▁with ▁a ▁distinct ▁r idge ▁on ▁the ▁bottom ▁edge . ▁The ▁top ▁edge ▁is ▁con ca ve ▁and ▁the ▁end ▁is ▁sharp ly ▁pointed . ▁It ▁is ▁about ▁ ▁of ▁the ▁length ▁of ▁the ▁head . ▁The ▁diameter ▁of ▁the ▁eye ▁is ▁about ▁ ▁of ▁the ▁length ▁of ▁the ▁head . ▁ ▁The ▁fish ▁has ▁three ▁pairs ▁of ▁bar b els . ▁The ▁max ill ary ▁bar b els ▁are ▁on ▁located ▁on ▁the ▁upper ▁j aw , ▁and ▁two ▁pairs ▁of ▁mand ib ular ▁bar b els ▁are ▁on ▁the ▁lower ▁j aw . ▁The ▁max ill ary ▁bar bel ▁has ▁a ▁narrow ▁memb rane ▁attached ▁near ▁the ▁base ▁and ▁is ▁straight ▁without ▁any ▁branches . ▁It ▁extends ▁at ▁least ▁as ▁far ▁as ▁the ▁base ▁of ▁the ▁p ector al ▁fin , ▁slightly ▁longer ▁than ▁the ▁length ▁of ▁the ▁head ▁and ▁ ▁of ▁the ▁standard ▁length ▁of ▁the ▁body . ▁The ▁outer ▁pair ▁of ▁mand ib ular ▁bar b els ▁extends ▁just ▁short ▁of ▁the ▁p ector al ▁g ird le , ▁about ▁ ▁of ▁the ▁length ▁of ▁the ▁head , ▁and ▁contains ▁four ▁to ▁five ▁branches ▁without ▁secondary ▁branches . ▁The ▁inner ▁pair ▁of ▁mand ib ular ▁bar b els ▁is ▁about ▁half ▁as ▁long ▁as ▁the ▁outer ▁pair , ▁about ▁ ▁of ▁the ▁length ▁of ▁the ▁head , ▁with ▁two ▁pairs ▁of ▁branches , ▁without