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  Order

Phragmophora

  Class

Sagittoidea

  No. of Genera in Ref.

2

  No. of Species in Ref.

3

  Environment

Fresh : No | Brackish : No | Marine : Yes

  Aquarium

  First Fossil Record

     

  Remark

All species are bathypelagic and most likely inhabit bottom water layer (Ref. 1659). Uppermost depth limit of distribution is 1,000 m deep. Morphological characters: (1) no transverse musculature is present in both the trunk and tail regions; (2) there is a single pair of lateral fins or gelatinous structures replacing the latter; (3) the setae are evenly curved, without showing a sharp bend, the denticles, if present, are not arranged into a bundle (like in Krohnittidae); (4) no digestive diverticula are present on the midgut (Ref. 1658).

  Etymology

  Division

  Reproductive guild

  Typical activity level

  Main Ref.

  Coordinator

Ref.
[ e.g. 9948]                       

Glossary
                    [ e.g. cephalopods]