How many kinds of lobsters are there in this country, and why are different varieties called lobster?

Two kinds of lobster-like crustaceans exist in United States waters. The "true" lobster (the American lobster) is designated as such to differentiate it from the other form found here, the spiny lobster. The two, from different families, display two differences:
american lobsterAmerican Lobster

The true lobster has claws on the first four legs, lacking in the spiny lobster; the spiny lobster has a pair of horns above the eyes, lacking in the true lobster. To avoid confusion over common names, it is best to call the true lobster the "American lobster," and the spiny lobster just that. The item marketed as "lobster tail" usually is a spiny lobster. The spiny lobster is found in warm waters off Florida, in the West Indies, and off southern California. Record weight for the American lobster is 45 pounds.

spiny lobsterSpiny Lobster

Does the deepwater northern lobster population differ from that found just off the coast?

The species in each population are identical in all respects.


How
far
do
lobsters
travel?

Inshore lobsters tend to stay in one place, seldom moving more than a mile or so, but deepwater lobsters farther out on the Continental Shelf follow a seasonal migratory pattern shoreward in summer, returning to the Shelf again in the autumn. The record travel so far is 225 miles covered by a lobster tagged off the Continental Shelf and recovered at Port Jefferson, Long Island, New York.

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(File Modified May. 08 2017)