. Bulletin of the British Museum (Natural History). Fig. 324 Recent western hemisphere distribution of Mytilopsis. Inset: M. sallei (Recluz), eastern Mexico, x Ecological data. Mytilopsis is usually found in brackish to fresh water. It occurs in lagoons in west Africa (Binder 1968), and in the western hemisphere. Keen (1971: 114) summarized the occurrence of M. adamsi Morrison in fresh water lagoons of San Jose Island, Panama. Marelli & Gray (1983: 192) report a rather similar distribution for M. sallei in coastal lakes and streams, but point out that little is known about i
. Bulletin of the British Museum (Natural History). Fig. 324 Recent western hemisphere distribution of Mytilopsis. Inset: M. sallei (Recluz), eastern Mexico, x Ecological data. Mytilopsis is usually found in brackish to fresh water. It occurs in lagoons in west Africa (Binder 1968), and in the western hemisphere. Keen (1971: 114) summarized the occurrence of M. adamsi Morrison in fresh water lagoons of San Jose Island, Panama. Marelli & Gray (1983: 192) report a rather similar distribution for M. sallei in coastal lakes and streams, but point out that little is known about its life cycle and factors affecting its distribution. It is often highly gregarious, living byssally attached to the substrate and other shells and nestling in small holes. Salinity tolerance is very high, ranging from fresh-water to supersaline (0-50 %o). Tolerance to changes in temperature are also high (Escar- bassiere & Almeida 1976, Sidall 1980, Marelli & Gray 1983). Morton (1981: 37-39) also draws attention to characteristics,. Fig. 325 Recent western hemisphere distribution of M. sallei (Recluz). Inset: M. sallei (Recluz), eastern Guatemala, x such as extensible siphons, ability to close the valves and efficient cleansing internal currents, which enable M. sallei to cope with a high sediment load. These characters are in keeping with a genus which is normally associated with wide seasonal variations in both salinity and temperature, and explain its ability to invade many Caribbean islands and the Pearl Islands off the Pacific coast of Panama, and to be introduced to other continents, with, or even without, the help of shipping. It is well suited to stretches of water near tropical coasts where salinities and water levels - and hence water temperatures - are likely to vary considerably between the rainy and dry seasons. Apart from the rare records of Mytilopsis in marine faunas (Miocene of Dominican Republic, Maury 1917, and M. jamaicensis Woodring, 1925, kno
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