FIG. 4 in A new deep-sea species of epibenthic acorn worm (Hemichordata, Enteropneusta)

FIG. 4. — Fixed specimens of Tergivelum baldwinae n. gen., n. sp.: A, holotype (ventral view) which broke into three parts when fixed – namely the left back veil (lbv), most of intestinal region of trunk (at right), and anterior body (at left, comprising proboscis, collar, and anterior extremity of trunk); B, holotype (dorsal view, excluding left back veil) with numbered letters indicating levels of cross section in Figures 5 and 6; C, enlargement of anterior portion of holotype in ventral view; lateral lips of collar (arrowheads) curl dorsally as a preservation artifact; D, enlargement of anterior portion of the holotype in dorsal view; arrows indicate dorsal protuberances; E, enlargement of anterior portion of holotype in left side view with arrow indicating fossa of left proboscis nerve; F, dorsal view of anterior region of trunk of paratype II (corresponding to area in rectangle in panel 4D); back veils and dorsal protuberances dissected away revealing dorsal nerve cord (arrowed) flanked by slot-shaped gill pores. Abbreviations for structural features: see text. Scale bars: A, B, 1 cm; C-F, 2 mm.