. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 166 Bulletin Museum of Conipardtive Zoology, Vol. 150, No. 3. Figure 51. Inner face of the sacculith (otolith with the sacculus). A. The most primitive zeiform Antigonia. B. The berycoid Beryx. C. The zeiform Capros. (Modified from Stinton, 1967.) merous challenging phylogenetic and evolutionary problems for future work- ers. The Lampridiformes Although the main radiation of acan- thopterygian fishes occurs in the Perci- formes, there seem to have diverged, at an earh stage, an assemblage of odd types of percomorphs.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 166 Bulletin Museum of Conipardtive Zoology, Vol. 150, No. 3. Figure 51. Inner face of the sacculith (otolith with the sacculus). A. The most primitive zeiform Antigonia. B. The berycoid Beryx. C. The zeiform Capros. (Modified from Stinton, 1967.) merous challenging phylogenetic and evolutionary problems for future work- ers. The Lampridiformes Although the main radiation of acan- thopterygian fishes occurs in the Perci- formes, there seem to have diverged, at an earh stage, an assemblage of odd types of percomorphs. The highly specialized Lampridiformes (opahs) are an assem- blage of mainly deep sea fishes (Walters, 1960; Walters and Fitch, 1960). The 1am- pridiform caudal skeleton shows similar- ities to that of some ber\ciformes. The proposed relationships of the Lampridi- formes to other percomorphs is depicted in Figure 50. Lampridiformes have no true spines in their fins and possess an luiusual jaw mechanism in which the slide out with the premaxillae during protrusion (Oelschlager, 1978; Pietsch, 1978a). The pelvic girdle is not attached to the cleithrum, but instead it is connected to a greatly enlarged special bone of the pectoral girdle, the h\ pocor- acoid (Oelschlager, 1978). Lampris, the opah or moonfish, is perhaps the best known for its odd appearance and size (about 1 m, and 300 kg). The Zeiformes The dories (Zeidae) and boarfishes (Antigoniidae) together are considered the sister group of the bcrx tilonncs (f^ig. 50) because of the shared specializations in the mori")h()l()g\ of the otoliths (Patterson, 1964). In zeiforms, the caudal skeleton has specialized along the lines characteristic for the perciforms and the zeiform pelvic fin with one spine and five to nine branched rays also approaches the per- ciform condition. The dories {Zeus) are thin, deep-bodied fishes with enormous- 1\- distensible jaws set at an obliciue an- gle. Thev are marine and widesprea
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