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Proboscis

Proboscis. Proboscis stalk. Collar. Gill pores. Branchial region. Midventral ridge. Trunk. Anus. MG. E. N. LM. CON. HV. BD. PC. T.S. proboscis of Sac. otagoensis. E. CCd. DCM. CC. DBV. BT. SH. LM. VCM. T.S. collar of Sac. kowalevskii. E. CC. N. DBV. PSH. BT. PBV.

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Proboscis

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  1. Proboscis Proboscis stalk Collar Gill pores Branchial region Midventral ridge Trunk Anus

  2. MG E N LM CON HV BD PC T.S. proboscis of Sac. otagoensis E CCd DCM CC DBV BT SH LM VCM T.S. collar of Sac. kowalevskii

  3. E CC N DBV PSH BT PBV LM T.S. collar of Sac. mereschkowskii DNC DBV CG I LML VBV VNC T.S. posthepatic intestine Bal. australiensis

  4. ANR DLV PH BD CT AC EGV PS K T.S. through proboscis stalk of Balanoglossus clavigerus DBV DNC GW E G GP LML I LS VBV VNC T.S. genital wings of Ptych. bahammensis

  5. 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

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