▁by ▁a ▁thin ▁band ▁of ▁skin ▁that ▁div ides ▁the ▁to oth pad . ▁This ▁character ▁is ▁used ▁as ▁a ▁method ▁of ▁differenti ating ▁between ▁two ▁different ▁but ▁similar ▁species ▁of ▁Sy nd ont is . ▁In ▁S . ▁gran ulos us , ▁the ▁to oth pad ▁is ▁un inter rupted , ▁or ▁continuous ▁without ▁a ▁break . ▁On ▁the ▁lower ▁j aw , ▁or ▁mand ible , ▁the ▁teeth ▁of ▁Sy nd ont is ▁are ▁attached ▁to ▁flexible , ▁st alk - like ▁structures ▁and ▁described ▁as ▁" s - sh aped " ▁or ▁" ho oked ". ▁The ▁number ▁of ▁teeth ▁on ▁the ▁mand ible ▁is ▁used ▁to ▁differenti ate ▁between ▁species ; ▁in ▁S . ▁gran ulos us , ▁there ▁are ▁ 2 8 ▁to ▁ 5 1 ▁teeth ▁on ▁the ▁mand ible , ▁arranged ▁in ▁a ▁single ▁row . ▁ ▁Some ▁of ▁the ▁species ▁of ▁Syn od ont is ▁have ▁an ▁opening ▁or ▁series ▁of ▁open ings ▁called ▁the ▁ax ill ary ▁p ore . ▁It ▁is ▁located ▁on ▁the ▁sides ▁of ▁the ▁body ▁below ▁the ▁hum eral ▁process ▁and ▁before ▁the ▁p ector al ▁fin ▁sp ine . ▁The ▁exact ▁function ▁of ▁the ▁port ▁is ▁not ▁known ▁to ▁scient ists , ▁although ▁its ▁presence ▁has ▁been ▁observed ▁in ▁seven ▁other ▁cat fish ▁gener a . ▁ ▁Fish ▁in ▁the ▁genus ▁Ac ro ch ordon ich th ys ▁are ▁known ▁to ▁se crete ▁a ▁m uc us ▁with ▁to xic ▁properties ▁from ▁their ▁ax ill ary ▁p ore ,