. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 148 R. S. SCHELTEMA 160 140 120 100. Figure 2A, B. Distribution of teleplanic larvae of coastal shoal-water invertebrates encountered at 219 locations in the open waters of the "east Pacific ; A. Locations where veliger larvae of gastropod molluscs were found. Large filled circles denote presence of veligers belonging to the family Architectonici- dae (see Fig. 3A, B); large open circles signify localities where Cymatiidae (= Ranellidae) were recovered; large half-filled circles show positions where the lar
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 148 R. S. SCHELTEMA 160 140 120 100. Figure 2A, B. Distribution of teleplanic larvae of coastal shoal-water invertebrates encountered at 219 locations in the open waters of the "east Pacific ; A. Locations where veliger larvae of gastropod molluscs were found. Large filled circles denote presence of veligers belonging to the family Architectonici- dae (see Fig. 3A, B); large open circles signify localities where Cymatiidae (= Ranellidae) were recovered; large half-filled circles show positions where the larvae of both Architectonicidae and Cymatiidae were encountered; smaller circles with rays designate veligers other than those of the twocommonmost families of gastropods. Rays on large circles indicate that other gastropod veligers were also found. Minnie circles indicate negative stations where no gastropod veligers were recovered. Arrow shows where specimen in Figure 3A and B was collected. change (Scheltema, 1971; p. 313) and under some cir- cumstances for colonization. Only positive data on the occurrence of larvae are useful; negative data must al- ways remain equivocal. Another familiar source of error may be avoidance of the net as probably occurs among some decapod crustacean larvae. To ascertain whether larvae of Indo-Pacific species found in the plankton have been effective in colonizing eastern Pacific islands or the American continent, the geographic range of species must be known. In particular it should be demonstrated that the Indo-Pacific species found in the eastern Pacific have planktonic larvae. Re- turn now to the two examples previously used. Among the gastropods Emerson (1982; 1983) reported 49 species of Indo-Pacific prosobranch gastropods in the eastern Pacific. Among these, 38% are known from the mainland while the remaining 62% are found only on islands (32 species on Clipperton, 3 on Cocos, 9 on the Galapagos, and 1 on Guadalupe). Additional species ar
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
