Yu Liu, Javier Ortega-Hernández, Dayou Zhai, Xianguang Hou
(A) YKLP11423, 5-mm-long juvenile preserved in dorsal view (light photography).
(B) YKLP11422, 7-mm-long juvenile preserved in dorsal view (light photography).
(E) YKLP11423, close-up of tomographic model figured in (G) showing labrum with anterior paired knob-like structures.
(F and F’) YKLP11422, tomographic slices of head region (reference lines in H) showing transverse organization of labrum relative to the great appendages at two different levels. Fossil specimen visualized in anterior-posterior plane, and oriented with dorsal side facing up.
(G) YKLP11423, tomographic model of 5-mm-long juvenile in ventral view.
(H) YKLP11422, tomographic model of 7-mm-long juvenile in ventral view.
Cn, cephalic biramous appendage pairs; ey, eyes; fg, foregut; ga, great appendages; hs, head shield; la, labrum; Tn, trunk appendage pairs; ts, tailspine. Arrowhead points toward posterior-facing mouth opening.