Fig. 4. Heterometra schlegelii morphological characters. A in Phylogeny and morphology of Himerometroidea (Echinodermata: Crinoidea) feather stars in Singapore

Fig. 4. Heterometra schlegelii morphological characters. A, distal margins of middle brachials everted in adults (red arrows); B, middle brachials of distal margins in juveniles, plain and not inverted (red arrows); C, middle cirrals of some juveniles bearing distally directed triangular projections near the distal margin of the cirral (red arrow) with projection gradually moving away from the distal edge in more distal cirrals (yellow arrow). Distal cirrals have sharp, aborally directed triangular projections or spines (white arrow); D, other juveniles have weak carinations on distal cirrals (red arrow); E, thin carinate extensions on basal segments of proximal pinnules (red arrows); F, extensions transition at middle pinnulars from facing arm tip (red arrows) to facing away from arm tip (yellow arrows) in adults; G, distal edge of distal pinnulars on proximal pinnules showing spinular side projection (yellow arrow) and premature rim of serration (white arrow); H, basal segments of proximal pinnules of one juvenile (SS-1085, ZRC.ECH.0389) bearing very weak carinate extensions on basal segments.