. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Relationships of Stomiiforms • Fink ami Weitzman 85. including Galaxndae Figure 23. Summary cladogram of the hypotheses suggested from our survey of primitive euteleostean groups. Rela- tionships of aulopiforms, myctophiforms, and acanthomorphs from Rosen, 1973. This bone is present in most primitive teleosts, including esocoids, argenti- noids, salmonids, and stomiifonns. A ba- sisphenoid is not present in ostariophy- sans (Fink and Fink, 1981). Third, osmeroids and galaxiids also lack an orbitosphenoid bone. An orbi
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Relationships of Stomiiforms • Fink ami Weitzman 85. including Galaxndae Figure 23. Summary cladogram of the hypotheses suggested from our survey of primitive euteleostean groups. Rela- tionships of aulopiforms, myctophiforms, and acanthomorphs from Rosen, 1973. This bone is present in most primitive teleosts, including esocoids, argenti- noids, salmonids, and stomiifonns. A ba- sisphenoid is not present in ostariophy- sans (Fink and Fink, 1981). Third, osmeroids and galaxiids also lack an orbitosphenoid bone. An orbito- sphenoid is present in most primitive te- leosts, but is also lacking in the salmonid Thymallus (Norden, 1961), in some species of Coregonus (Norden, 1961), and in stomiiforms. The presence of large, serially ar- ranged mesopterygoid teeth in osmeroids and galaxiids, unique within the elopo- cephalans, together with the absence of orbitosphenoid and basisphenoid bones, supports the placement of galaxiids with- in the osmeroid assemblage. Rosen listed all family level groups in the Osmeroidea as incertae sedis; we would add to that list the Galaxiidae, pending further work. The possibility of relationship of Lepi- dogalaxias to the osmeroids has been noted above, based on the presence of serially arranged teeth on the mesopter- ygoid; the two authors who have exam- ined this fish (Mees, 1961 and Rosen, 1974) disagree on whether those teeth are present. Two features suggest that the salmo- nids may be more closely related to the neoteleosts than to the rest of the "prot- ; The first of these is the configuration of the posterior neuro- cranium and the articulation of the skull with the anterior vertebra. In salmonids, the exoccipital as well as the basioccipi- tal articulates with the anterior vertebra. In Brachymystax and Thymallus (see Norden, 1961, PI. 2 for Thymallus), ex- occipital/basioccipital morphology is much as in Diplophos. In almost
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