Fish codes: MD = Millicoma Dace; SD = Speckled Dace; CRS = Coastrange Sculpin; RT = Rainbow Trout; RS = Riffle Sculpin; CT = Cutthroat Trout; CO = Coho Salmon; SKB = Threespine Stickleback; RSS = Redside Shiner; SU = Largescale Sucker; LAM = lamprey ammocoete
Like most lampreys (family Petromyzontidae), both of these species have complex life cycles that include an extended larval stage (the ammocoete
stage) and a relatively brief adult stage (Hardisty, 2006).
In vertebrates, however, the mouth in ammocoete
larvae, which are also suspension feeders, is exclusively innervated by efferent fibers (maxillomandibular nerve) from the CNS (Kuratani et al.
The expression pattern of lamprey neural crest homologs was examined from late gastrulation (E4) through early ammocoete
larval stages (Fig.
For example, Lacalli and West (1993) propose that the distinctive multipolar cells of echinoderm circumoral ciliary bands are homologous with similar neurons in the ciliary bands of the hemichordate tomaria, as well as with those in the dorsal nerve cord of ammocoete
larvae of the lancelet Branchiostoma.