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Slide 2 Slide 3 Slide 4 Slide 5 Slide 6 Proboscis Proboscis stalk Collar Gill pores Branchial region Midventral ridge Trunk Anus Slide 7 E DCM DBV SH LM VCM CCd CC BT T.S. collar of Sac. kowalevskii E N LM MG CON PCBD HV T.S. proboscis of Sac. otagoensis Slide 8 T.S. posthepatic intestine Bal. australiensis T.S. collar of Sac. mereschkowskii E CC DBV PSH PBV LM N BT DNC DBV CG I LML VBV VNC Slide 9 T.S. genital wings of Ptych. bahammensis G LS DBV DNC GW E GP LML I VBV VNC ANR PH BD AC EGV PS K CT T.S. through proboscis stalk of Balanoglossus clavigerus DLV Slide 10 Hemichordate enteropneust key: ANR, anterior nerve ring AC, anterior extensions of collar coeloms (contain longitudinal muscles) BD, buccal diverticulum BT, buccal tube CC, collar coelom CCd, collar cord CG, ciliated groove CON, connective tissue CT, chondroid tissue DBV, dorsal blood vessel DCM, dorsal collar mesentery DLV, dorsal longitudinal vessel DNC, dorsal nerve cord E, epidermis EGV, efferent glomerular blood vessels G, gonad GP, gonopore GW, genital wing HV, heart vesicle I, intestine K, keel LM, longitudinal muscles LML, longitudinal muscle layer LS, lateral septum MG, middorsal groove PBV, peribuccal blood vessels PC, proboscis coelom PH, perihaemal cavities (contain longitudinal muscles) N, nervous layer PS, proboscis skeleton PSH, proboscis skeleton horns SH, skeletal horns VBV, ventral blood vessel VCM, ventral collar mesentery VNC, ventral nerve cord Slide 11 Slide 12 Slide 13 Slide 14 Slide 15 Slide 16 Slide 17 Slide 18 Slide 19 Slide 20 Slide 21 Slide 22 Slide 23 Slide 24 Slide 25 Slide 26 Slide 27 Slide 28 Slide 29 Slide 30 Slide 31 Slide 32 Slide 33 Slide 34 Slide 35 Slide 36 Slide 37