Mussels hold their valves together very securely but " Pisaster ochraceus " can insert part of its everted stomach, or some digestive juices, through the narrow gap that exists where the byssal threads emerge from the shell.
32.
The word " mussel " is most frequently used to mean the edible bivalves of the marine family Mytilidae, most of which live on exposed shores in the intertidal zone, attached by means of their strong byssal threads ( " beard " ) to a firm substrate.
33.
The zebra mussels'success is due to a very high reproductive rate _ females lay up to 1 million eggs a year _ and their almost unique ability to " hitchhike " on long-distance barges and recreational boats, firmly attaching themselves to hulls with elastic fiber-like byssal threads.
34.
Shells without a pallial sinus are termed " integripalliate " such animals ( as mentioned, the scallops as well as some other groups ) often have a byssal notch present on the " anterior " end of the " right " valve ( only ), and the anterior auricles or " wings " of both valves will be either larger than, or equal to, the posterior ones.
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