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Figure 11 | Frontiers in Zoology

Figure 11

From: A detailed description of the development of the hemichordate Saccoglossus kowalevskii using SEM, TEM, Histology and 3D-reconstructions

Figure 11

Detail images of the juvenile of Saccoglossus kowalevskii at 2 gill slit stage (~ 432 h pf). (A-E) 3D-reconstruction, (F-H) histological sections. (A,B) Detail images showing the left and right sides of the collar and anterior trunk region. Note the asymmetric development of the gill pores (gp). (C) The pericardium (pd) is overlying the heart sinus (hs), which is in turn connected to the glomerulus (gl) by a pair of lateral vessels (lv). Note, the dorsal vessel which supplies the heart sinus from posterior is not shown. (D) View from posterior, the right meso- and metacoel are hidden. The dorsal nerve cord (dnc) terminates just before the anus (an). The metacoel is extended into the post-anal tail (pat). (E) Dorsal view focussed on the pharyngeal region (ph). The skeletal rods (skr) develop asymmetrically and ar of unequal number. The proboscis pore (pp) opens dorsally on the left side of the base of the proboscis. (F) Cross section of the trunk region. The ventrolateral metacoelic cells constitute the substantial longitudinal muscles (lm) of the trunk. (G) Cross section of the collar region. The collar cord (cc) runs within the dorsal mesentery. (H) Longitudinal section showing the position of the proboscis pore, stomochord, pericardium and heart sinus. The majority of the protocoelic cavity (pc) is filled with longitudinal muscles. Anterior is to the left. ep epidermis, hg hindgut, mc mouth cavity, ms mesocoel, mt metacoel, oe oesophagus, ps proboscis stem, sk proboscis skeleton, st stomochord, vnc ventral nerve cord.

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