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Key To The Onuphidae

This key is organised in a slightly different way to the others in this section. Please select the appropriate character by clicking on the image or text. This will then take you to the next set of characters and so on down the page. If you make a mistake then go back to the previous level using the back a level option.

The most recent treatment of this family was given by H. Paxton 1986. Generic revision and relationships of the Family Onuphidae (Annelida: Polychaeta). Records of the Australian Museum 38:1-74.

(Images are adapted from Day (1967), Fauchald (1973, 1974) and Paxton (1986))

A. 2 or more anterior segments strongly modified B. Anterior segments not strongly modified
A. 2 or more anterior segments strongly modified
A.i Only first two segments modified A.ii More than two segments modified
Paradiopatra

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 A.ii More than 2 anterior segments strongly modified
Modifed segments with pseudocompound falcigers   Modified segments with hook-shaped setae  
        
 Americonuphis     Antennae short

Rhamphobranchium

  Antennae long

Longibranchium

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B. Anterior segments not strongly modified
B.i Tentacular Cirri Present

B.ii Tentacular Cirri Absent
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B.i Tentacular cirri present

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  C. Branchiae 
C.i Absent

C.ii Simple

C.iii Spiralpicture of spiral branchiae

C.iv Pectinate

Paradiopatra

Nothria

   

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C.iii Branchiae spiral
Antennae with short ceratophores Antennae with long ceratophores

Diopatra

Heptaceras

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C.iv Pectinate branchiae

D. Branchial position

D. i Branchiae start on S1

Onuphis

D.ii Branchiae start on S6

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D.ii Branchiae start on S6
E. Number of rings on ceratophore

E. i Ceratophores 3-7 rings

Kinbergonuphis

E.ii Ceratophores 10-25 rings

 
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Dorsal Cirri Long

Hirsutonophis

Dorsal Cirri Short

Australonuphis

B.ii Tentacular Cirri Absent 
  Branchiae 

Present as simple filaments

  Present -spiral

Absent

Hyalinoecia

  Epidiodiopatra

Hyalinoecia

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