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Table 1 Taxonomic arrangement of the polyplacophoran order Lepidopleurida, and genera that have been formerly referred to Lepidopleurida, and occurrence of the Schwabe organ

From: A new sensory organ in “primitive” molluscs (Polyplacophora: Lepidopleurida), and its context in the nervous system of chitons

Suborder

Family

Genus

Schwabe organ

Lepidopleurina

Ferreiraellidae

Ferreiraella

present

 

Hanleyidae

Hanleya

present

 

Leptochitonidae

Hanleyella

present

  

Lepidopleurus

present*

  

Leptochiton

present

  

Parachiton

present

  

Pilsbryella

unknown

 

Nierstraszellidae

Nierstraszella

present

 

Protochitonidae

Deshayesiella

present

  

Oldroydia

present

Acanthochitonina

Choriplacidae (C)

Choriplax (C)

absent

 

Hemiarthridae

Hemiarthrum (C)

absent

  

Weedingia (C)

unknown**

  1. The authors have visually examined specimens in these genera for external pigment patches associated with the sensory structure described. Genera that have been suggested as members of Chitonida (Sirenko, 2006) but formerly referred to Lepidopleurida are noted (C).
  2. *Small patches, very close to the head, where they occur in deep grooves.
  3. **Investigated in one specimen and not observed in preserved material, but cannot be definitively excluded (Sigwart et al., 2013).