. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 26 Bulletin Museum of Comparative Zoology, Vol. 141, No. 1 J SCALE 0 100 200 I I I MILES. ^portoriceQs^''"^""""' \n ^. 0 0 0. Fig. 19. Proposed routes of colonization of the West Indies by the cantherigerus species assemblage. The arrows are not intended to represent exact paths. The distribution of extant species and genera is as indicated. It is not certain whether this group entered from Central or South America. on Cuba. Th
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 26 Bulletin Museum of Comparative Zoology, Vol. 141, No. 1 J SCALE 0 100 200 I I I MILES. ^portoriceQs^''"^""""' \n ^. 0 0 0. Fig. 19. Proposed routes of colonization of the West Indies by the cantherigerus species assemblage. The arrows are not intended to represent exact paths. The distribution of extant species and genera is as indicated. It is not certain whether this group entered from Central or South America. on Cuba. This was followed by a sub- sequent dispersion and radiation to Jamaica (ater), the Little and Great Bahama banks (vii(Ui), and Hispaniola (melanichnus) (Fig. 19). From Hispaniola an early stage of melanichnus gave rise to portoricensis on Puerto Rico. The four speeies of the Virgin Islands and Lesser Antilles, sancticrucis, lufiventris, rijp,, and antillensis, ap- pear to be part of a relatively reeent radi- ation of portoricensis, with differentiation on these geographically isolated islands. The remaining history of the group involves a series of inter-island colonizations to centrally placed Hispaniola from the more peripheral islands of the Greater Antilles. A second migration from Cuba by an early stage of cantheri^ienis seems best to ac- count for anomalus, \\'hich shows a closer affinity to the Cuban species than to melanichnus (Hispaniola). Alternatively, a back colonziation from Puerto Rico may have resulted in anomalus. The rather peculiar Hypsirhynchiis ferox is close to ater (Jamaica) with respect to its skull and hcnnipenis and possibly represents a Jamaica-Hispaniola migration, with sub- sequent specialization of Hypsirhynchtis resulting in its external differences. Another endemic genus on Hispaniola, Uromacer, may have been derived from an early form of H. ferox before the latter achieved its peculiar specializations. Because of its central location, Hispa
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
