. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 300 RUDOLF S. SCHELTEMA distinguishable among teleplanic gastropod veligers. The first of these is that found in such forms as Charonia varici/ata, Tonna galca, Philippia krcbsii, Pedicularia sicula (), and Cymatium parthenopeum. Larvae of these species were found in all three trans-Atlantic surface currents, viz., the North Atlantic Drift and the North and South Equatorial Currents. Some species such as Phalium granulatum,. 30° FIGURE 7. Geographical distribution of the larvae of Tonna galca (Linne) (= 1) and Tonna macul
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 300 RUDOLF S. SCHELTEMA distinguishable among teleplanic gastropod veligers. The first of these is that found in such forms as Charonia varici/ata, Tonna galca, Philippia krcbsii, Pedicularia sicula (), and Cymatium parthenopeum. Larvae of these species were found in all three trans-Atlantic surface currents, viz., the North Atlantic Drift and the North and South Equatorial Currents. Some species such as Phalium granulatum,. 30° FIGURE 7. Geographical distribution of the larvae of Tonna galca (Linne) (= 1) and Tonna maculosa (Dillwyn) (=2). Small open circles denote stations where no species of Tonna veligers were found. Stippled areas show geographical regions where post-larval Tonna galea are found to the edge of the continental shelf (Turner, 1946). Tonna maculosa post-larvae are known in the eastern Atlantic only from scattered records, specifically in the Canaries (see: Fischer-Piette and Nickles [1946, pages 45-48] for relevant literature.) Arrows indicate direction of surface currents. Thais haemastoma, and Smaragdia virldis were missing in the North Equatorial Current but moved in a westerly direction on the South Equatorial Current only. The second basic distributional pattern is that in which larvae were missing in the North Atlantic Drift. Such a distribution is not represented among the ten species considered here, but examples may be found in the gastropod genera Bursa and Cypraea. These genera evidently have larvae which are dispersed eastwardly on the Equatorial Undercurrent, which provides them with a means for larval trans-. 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 1907/08-1952; Lillie,
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
