dorsal blood vessel

From ZooTerms (Dictionary of Invertebrate Zoology)
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dorsal blood vessel: 1. (Arthropoda: Insecta) The posterior heart and anterior aorta.

2. (Echiura) A dorsal tubular blood vessel in the anterior part of the body cavity often associated with the foregut; functioning in the transport of blood anteriorly to the median vessel of the proboscis; sometimes called the heart.