. Bulletin - United States National Museum. Science. 102 NATIONAL MUSEUM BULLETIN 2 78 nese waters (approximately 20° of latitude) whereas only 26 species are found in the western North Atlantic (approximately 50° of latitude). This paucity of species in the North Atlantic was observed by Mills (1965) for the gammaridean genus Ampelisca. He stated that inter- tidal species may be few because of winter ice scouring and that perhaps sharp temperature zonation and a wide range of temperatures do not favor the differentiation of stenothermal species. Many of the caprellid species in the tempe
. Bulletin - United States National Museum. Science. 102 NATIONAL MUSEUM BULLETIN 2 78 nese waters (approximately 20° of latitude) whereas only 26 species are found in the western North Atlantic (approximately 50° of latitude). This paucity of species in the North Atlantic was observed by Mills (1965) for the gammaridean genus Ampelisca. He stated that inter- tidal species may be few because of winter ice scouring and that perhaps sharp temperature zonation and a wide range of temperatures do not favor the differentiation of stenothermal species. Many of the caprellid species in the temperate zone of the western North Atlantic are almost cosmopolitan in their distribution and appear to be highly elastic eurythermal and euryhaline species. For example, CapreUa penantis is found in most parts of the Atlantic and Pacific from the boreal to the tropical zone and in salinities ranging from full sea water to as low as 10 °/oo. Table 3 summarizes the known distribution of the caprellids of the western North Atlantic (figs. 50-55). In general they correspond to. Figure 50.—Distribution records of Hemiaegina minuta, Hemiproto zvigleyi, Mayerella limicola, Mayerella redunca, and Metaprotella hummelincki in the western North 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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