Fig. 4From: Homeosis in a scorpion supports a telopodal origin of pectines and components of the book lungsEmbryonic stage of Centruroides sculpturatus (Arizona bark scorpion) with limb buds. ch, chelicera; gb, partially developed bud of genital operculum leg; lb., labrum; l1–l4, leg 1–leg 4; O1–O5, opisthosoma 1–opisthosoma 5; pb, partially developed bud of pectine; pp., pedipalp; sb, partially developed bud of sternal protrusion. Green arrows show the position where stigmata will develop. Scale bar is 200 μmBack to article page