sagitta

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D dorsal side, V ventral side, ik inner germinal layer, mv visceral mesoblast, lh body-cavity, mp parietal mesoblast, ak outer germinal layer The same kind of coelom-formation as in sagitta was afterwards found by Kowalevsky in brachiopods and other invertebrates, and in the lowest vertebrate--the amphioxus.

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Definitions (11)

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  1. [capitalized] An insignificant but very ancient northern constellation, the Arrow, placed between Aquila and the bill of the Swan. It is, roughly speaking, in a line with the most prominent stars of Sagittarius and Centaurus, with which it may originally have been conceived to be connected. Also called Alahance.
  2. In anatomy, the sagittal suture.
  3. In ichthyology, one of the otoliths of a fish's ear.
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Examples (36)

  • Coelomula of sagitta (gastrula with a couple of coelom-pouches. —  The Evolution of Man — Volume 1
  • Coelomula of sagitta, in section. —  The Evolution of Man — Volume 1
  • D dorsal side, V ventral side, ik inner germinal layer, mv visceral mesoblast, lh body-cavity, mp parietal mesoblast, ak outer germinal layer The same kind of coelom-formation as in sagitta was afterwards found by Kowalevsky in brachiopods and other invertebrates, and in the lowest vertebrate--the amphioxus. —  The Evolution of Man — Volume 1
  • The body-cavity originates in the great majority of animals (especially in all the vertebrates) in the same way as in sagitta: a couple of pouches or sacs are formed by folding inwards at the primitive mouth, between the two primary germinal layers; as these pouches detach from the primitive gut, a pair of coelom-sacs (right and left) are formed; the coalescence of these produces a simple body-cavity. —  The Evolution of Man — Volume 1
  • It was therefore very gratifying that Oscar Hertwig (1880) fully explained the anatomy, classification, and evolution of the chaetognatha in his careful monograph The spherical blastula that arises from the impregnated ovum of the sagitta is converted by a folding at one pole into a typical archigastrula, entirely similar to that of the Monoxenia which I described (Chapter 1.8, Figure 1.29). —  The Evolution of Man — Volume 1
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Etymologies (1)

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  1. New Latin, from Latin sagitta, an arrow, a bolt, prob. akin to Greek σάγαρις, a battleax. Hence ult. satty, settee.
 

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/səˈdʒɪtə/
by Grant Barrett

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