. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Relationships of Stomiiforms • Fink and Weitzmcin 69 anterior cartilaginous process- anterior process lateral plate lateral process radials fin rays. medial plate lateral cartilaginous process posterior cartilaginous process posterior plate Figure 20. Pelvic fin girdle of D. maderensis (USNM 186282; mm SL). ventral view; ventral fin ray halves removed proximally to show radials. MONOPHYLY OF THE StOMIIFORMES The morphological diversity of species now placed in the Stomiifomies has his- torically presented proble
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Relationships of Stomiiforms • Fink and Weitzmcin 69 anterior cartilaginous process- anterior process lateral plate lateral process radials fin rays. medial plate lateral cartilaginous process posterior cartilaginous process posterior plate Figure 20. Pelvic fin girdle of D. maderensis (USNM 186282; mm SL). ventral view; ventral fin ray halves removed proximally to show radials. MONOPHYLY OF THE StOMIIFORMES The morphological diversity of species now placed in the Stomiifomies has his- torically presented problems to system- atic ichthyologists. The morphological differences between, say, Argijropelecus (see Weitzman, 1974, Figs. 11 and 12; Schultz, 1964, Fig. 64) and Malacosteus (see Morrow, 1964b, Fig. 144) confound- ed many early workers and led them to place various genera with groups now re- moved to other positions in our hypoth- eses of teleostean phylogeny. Most di- agnoses of the group have included the presence of photophores and a combina- tion of other features which are distrib- uted widely among primitive teleosts (see Regan, 1923; Morrow, 1964a; Weitz- man, 1967a; and our discussion concern- ing Greenwood et ah, 1966, below). So far as we are aware, the monophyly of the Stomiiformes has never been explicitly documented by characters unique to the group. The Stomiifonnes can be diag- nosed by the presence of the following characters: 1) Photophores with a structure unlike that of other teleosts. Bassot (1966, 1970) has described stomiiform photophores histologically and found that they are composed primarily of two cell types, designated by him as A and B. Type A cells, typified in part by the well-devel- oped endoplasmic reticulum, apparently produce the luminescent product (see Herring and Morin, 1978). More recent works on the histology of stomiiform light. Please note that these images are extracted from scanned page images that may have been digitally enhanced for
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