Dictionary » I » Isthmus



Origin: L. Isthmus, gr. 'isqmos a neck, a neck of land between two seas, an isthmus, especially the isthmus of Corinth; prob. From the root of 'ienai to go; cf. Icel. Eith isthmus. See Issue.

(Science: geography) a neck or narrow slip of land by which two continents are connected, or by which a peninsula is united to the mainland; as, the isthmus of Panama; the isthmus of Suez, etc. Isthmus of the fauces.

(Science: anatomy) see fauces.

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Re: Experimental evidence for evolution

... other than to species on the same side of the barrier. This is exactly what evolutionary biologists have found. Coyne writes: Each side of the Isthmus of Panama, for example, harbors seven species of snapping shrimp in shallow waters. The closest relative of each species in another species ...

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by StevePush
Tue Oct 05, 2010 7:48 am
Forum: Evolution
Topic: Experimental evidence for evolution
Replies: 103
Views: 179687

Re: Does it really matter?

On that point, Jack, I agree. A good example is when South America collided with North America at the isthmus of Panama about 3 million years ago. It created a passage between, and a large number of North American species entered the south, and a large number of South American ...

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by skeptic
Thu May 06, 2010 8:40 am
Forum: Ecology
Topic: Does it really matter?
Replies: 33
Views: 27474

Female and male sex cell question

Click the image to see full view size Female route: Ovarium - fimbriae - oviduct (isthmus) - uterus - cervix - vagina - (vulva) http://www.irishhealth.com/content/image/550/Image1.jpg --- Male route: Testis - ductus efferentes - epididymis - vas ...

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by Dr.Stein
Mon Dec 12, 2005 8:18 am
Forum: Human Biology
Topic: Female and male sex cell question
Replies: 1
Views: 26866

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