. Breviora. . Figure 1. Placoderrai with short shoulder girdles: A, Order Pseudope- talichthyida (ventral view of Pseudopetalichthys problematica, , from Gross, 1962) ; B, Order Rhenanida (ventral view of Gemuendina stuertzi, , from Gross, 1963) ; C, Order Acanthoihoraci (lateral view of shoulder girdle of Palaeacanthaspis vasta, , from Stensio, 1944); D, Order Ptyctodontida (lateral view of head and shoulder girdle of Rhamphodopsis thrdplandi, fiom Miles, 1967). Adl, anterior dorsolateral plate; Al, anterior lateral plate; ba, basal elements of pectoral fin; br, branchial
. Breviora. . Figure 1. Placoderrai with short shoulder girdles: A, Order Pseudope- talichthyida (ventral view of Pseudopetalichthys problematica, , from Gross, 1962) ; B, Order Rhenanida (ventral view of Gemuendina stuertzi, , from Gross, 1963) ; C, Order Acanthoihoraci (lateral view of shoulder girdle of Palaeacanthaspis vasta, , from Stensio, 1944); D, Order Ptyctodontida (lateral view of head and shoulder girdle of Rhamphodopsis thrdplandi, fiom Miles, 1967). Adl, anterior dorsolateral plate; Al, anterior lateral plate; ba, basal elements of pectoral fin; br, branchial arches; en, endocranium; Ig, lower jaw; It, lower dental plate; Md, median dorsal plate; mk, Meckel's cartilage; or, orbit; pcf, pectoral fin; Pdl, posterior dorsolateral plate; PI, posterior lateral plate; pvf, pelvic fin; sh, shoulder girdle; Sp, spinal plate; syn, synarcual; ut, upper dental Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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