' s ▁fin ches ▁on ▁the ▁Gal á pag os ▁Islands ▁described ▁by ▁Charles ▁Dar win . ▁ ▁Pract ical ▁imp lications ▁ ▁B iod iversity ▁estimates ▁ ▁It ▁has ▁been ▁suggested ▁that ▁crypt ic ▁species ▁complex es ▁are ▁very ▁common ▁in ▁the ▁marine ▁environment . ▁That ▁suggestion ▁came ▁before ▁the ▁detailed ▁analysis ▁of ▁many ▁systems ▁using ▁DNA ▁sequence ▁data ▁but ▁has ▁been ▁proven ▁to ▁be ▁correct . ▁The ▁increased ▁use ▁of ▁DNA ▁sequence ▁in ▁the ▁investigation ▁of ▁organ ism al ▁divers ity ▁( also ▁called ▁ph y lo ge ography ▁and ▁DNA ▁bar c oding ) ▁has ▁led ▁to ▁the ▁discovery ▁of ▁a ▁great ▁many ▁crypt ic ▁species ▁complex es ▁in ▁all ▁habit ats . ▁In ▁the ▁marine ▁b ry oz o an ▁C elle por ella ▁h yal ina , ▁detailed ▁morph ological ▁anal ys es ▁and ▁m ating ▁compatibility ▁tests ▁between ▁the ▁isol ates ▁identified ▁by ▁DNA ▁sequence ▁analysis ▁were ▁used ▁to ▁confirm ▁that ▁these ▁groups ▁consisted ▁of ▁more ▁than ▁ 1 0 ▁e colog ically - dist inct ▁species , ▁which ▁had ▁been ▁diver ging ▁for ▁many ▁million ▁years . ▁ ▁Ev idence ▁from ▁the ▁identification ▁of ▁crypt ic ▁species ▁has ▁led ▁some ▁to ▁conclude ▁that ▁current ▁estimates ▁of ▁global ▁species ▁rich ness ▁are ▁too ▁low . ▁ ▁D ise ase ▁and ▁path ogen ▁control ▁ ▁P ests , ▁species ▁that ▁cause ▁dise ases ▁and ▁their ▁vectors , ▁have ▁direct ▁importance ▁for ▁humans . ▁When ▁they ▁are ▁found ▁to ▁be ▁crypt ic ▁species ▁complex es , ▁the ▁e col