• Webster's Revised Unabridged Dictionary
    • n. pl Streptoneura (Zoöl) An extensive division of gastropod Mollusca in which the loop or visceral nerves is twisted, and the sexes separate. It is nearly to equivalent to Prosobranchiata.
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Century Dictionary and Cyclopedia
    • streptoneura A branch of anisopleurous Gastropoda, in which the long loop of visceral nerves embracing the intestine is caught and twisted into a figure-of-8 by the torsion which the animal undergoes in its development. The Streptoneura are divided into two orders, Zygobranchia and Azygobranchia. They include all the anisopleural gastropods except the opisthobranchs and pulmonifers. The nearest synonym is Prosobranchiata.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. curved + a sinew


In literature:

The characteristic torsion attains its maximum effect among the majority of the Streptoneura.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5" by Various
For example of the most crooked, or Azygobranchiate division of the Streptoneura, turn now to Fig.
"Stories of the Universe: Animal Life" by B. Lindsay