. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. a Callmectes sapidus Carcmus maenas Grapsus Uca Ocypode tenuicrustatus ^urvillei quadrata a-a Panulirus interruptus. Bathynornus giganteus Pagurus bernhardus Galathea squamifera Birgus latro FIGURE 6. The distribution of immunologically corresponding hemocyanin subunits among the Crus- tacea. The various subunit patterns of crossed immunoelectrophoresis are shown, and the native aggregation states (1 X 6, 2 X 6) are indicated. It appears that decapodan hemocyanins evolved from an ancient alpha hexamer; the first step was the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. a Callmectes sapidus Carcmus maenas Grapsus Uca Ocypode tenuicrustatus ^urvillei quadrata a-a Panulirus interruptus. Bathynornus giganteus Pagurus bernhardus Galathea squamifera Birgus latro FIGURE 6. The distribution of immunologically corresponding hemocyanin subunits among the Crus- tacea. The various subunit patterns of crossed immunoelectrophoresis are shown, and the native aggregation states (1 X 6, 2 X 6) are indicated. It appears that decapodan hemocyanins evolved from an ancient alpha hexamer; the first step was the invention of beta-typical antigen determinants (arrow), which is correlated with the occurrence of 2 X 6 aggregates. Beta was repeatedly lost in later appearing groups (Caridea, Palinura, Uca/Ocypode). All alpha subunits are homologous proteins as are all beta subunits. Gamma differs, however: except for their partial identity with alpha, we were unable to identify typical immune reactions which interpose between more distant gamma subunits. Thus, rather than being homologous, they could represent convergent offsprings of different alpha progenitors. It should be noted that our results, although useful in explaining the phylogenetic coherence between the various subunits, in most cases are insufficient to refine the current phylogenetic tree derived from morphological characters and palaeontological records (Schram, 1982), which is the basis for this scheme. As an exception, our data strongly support an early branch of the Anomura as indicated, which was not derived from classical approaches. The figure was modified from Markl el al. (1986a).. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 19
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
