ID Keys
*Images in development

Pectinoidea (500 - 5000m)

#1
Ctenolium present
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Ctenolium absent
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#2
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Shell with commarginal undulations and very fine radial striations
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Glassy shells with antimarginal sculpture and commarginal rows of small vesicles.
Delectopecten vitreus
  
#3
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Radial sculpture distinct, riblets present of the right valve ear (Atlantic Margin)
Hyalopecten pudicus
  
Radial sculpture weak, ears smooth (Arctic)
Hyalopecten frigidus
  
#4
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With internal riblets
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Lacking internal riblets
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#5
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Exterior of left valve with narrow radial riblets
Parvamussium permirum
  
Exterior of left valve with commarginal lines only
Propeamussium lucidum
  
#6
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Radial rows of vesicles present on left valve
Cyclopecten hoskynsi
  
No radial macrosculpture
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#7
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Commarginal ridges or undulations present
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No commarginal sculpture
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#8
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Commarginal ridges over whole valve
Cuspidaria undata
  
Shell smooth except for few marginal undulations
Catillopecten eucymatus
  
#9
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No antimarginal microsculpture
Similipecten similis
  
Antimarginal sculpture present on at least part of a valve
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#10
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Antimarginal sculpture over whole of left valve
Similipecten greenlandicus
  
Sparse antimarginal sculpture restricted to umbo of left valve
Similipecten oskarssoni