First and Second instar of C. salei. All scale bars 500 μm. SEMs, a-b, g-h; light micrographs, c-f. a-e First instar. a: Ventral view. Numbers indicate the seven podomeres of L2. White arrows indicate the slit-like opening of the book lung system. a': Detail of the tip of the left chelicere showing the fang (f), a sharp cuticular claw on which the opening of the poison gland is visible (white arrow head). Black arrows indicate the retromarginal teeth at the base of the chelicere. a'': Detail of the mouth region. Numbers indicate the six podomeres of the pedipalp. b: Dorsal view. c-e: Dorsal view of increasingly older first instars, illustrating the increase in pigmentation. f-h Second instar. f: Dorsal view. g: SEM image. Dorsal view shows the arrangement of the eyes (al: anterior lateral eye, am: anterior median eye, pl: posterior lateral eye, pm: posterior median eye) and the petiolus (white arrow). g' Frontal view. Higher magnification of the eye region of g. h: Ventral view. The mouth opening is surrounded antero-laterally by the two cheliceres (Ch), laterally by the endites (en) of the pedipalps (P) and posteriorly by the labium (Lab). The labrum anterior to the mouth opening is covered by the cheliceres. L1-L4, walking leg one to four; Lb, labrum; Pet: petiolus; PS, prosomal shield; Sp, spinnerets; St, sternum.