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Table 2 Presence or absence of different pallial sensory organs in the Polyplacophora

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

Taxa lo O bo Sources Notes
Leptochitonidae      
Lepidopleurus cajetanus + - + Plate (1899); Yonge (1939); Haszprunar (1981, 1987)  
Leptochiton asellus + - + Plate (1899); this study Yonge (1939) failed to find the lateral sense organs in this species
Leptochiton medinae + - + Plate (1899)  
Leptochiton rugatus + - + This study  
Hanleyidae      
Hanleya hanleyi + - + Burne (1895); Plate (1899) Partly as H. abyssorum; “At the front [of the half shell groove] are found discrete bumps or strips of higher, but not as sharply defined, epithelium than the surrounding epithelium, which is possibly also sensory. (Plate, 1899, p. 78)
Callochitonidae      
Callochiton septemvalvis    Plate (1899) As C. laevis
Ischnochitonidae      
Ischnochiton bouryi   + “+” von Knorre (1925) As I. aequigranulatus; the author does not explicitly describe a branchial sense organ, but mentions a lateral respiratory epithelium
Ischnochiton rissoi   +   Haszprunar (1987)  
Ischnochiton stramineus   +   Plate (1899) As I. imitator
Stenoplax alata   +   Plate (1901); von Knorre (1925) Partly as I. herdmani
Stenoplax conspicua   +   Plate (1901)  
Callistoplacidae      
Calloplax vivipara    Plate (1899)  
Chaetopleuridae      
Chaetopleura peruviana   +   Plate (1899)  
Chitonidae      
Chiton corallinus   +   Blumrich (1891) Partly as C. laevis (see Thiele 1895a)
Chiton cumingsii   +   Plate (1899)  
Chiton olivaceus   +   Blumrich (1891); Plate (1899); Haszprunar (1981, 1987) Partly as C. siculus
Chiton sp.   +   Thiele (1890)  
Tonicia atrata   +   Plate (1901) As T. fastigiata
Acanthopleura echinata   +   Plate (1901)  
Acanthopleura gemmata   +   Kamardin (1988, 1989) Most probably A. brevispinosa.
Enoplochiton niger   +   Plate (1901)  
Tonicellidae      
Lepidochitona caprearum   +   Blumrich (1891); Haszprunar (1987) Partly as C. polii
Lepidochitona cinerea   + + Pelseneer (1898); von Knorre (1925); Yonge (1939); Haszprunar (1987) Partly as Boreochiton marginatus; von Knorre (1925) mentioned the branchial sense organ.
Boreochiton rubra   +   Plate (1899)  
Tonicella marmorea   +   Plate (1899); Yonge (1939)  
Mopaliidae      
Nuttallochiton martiali   +*   Plate (1898; 1899) As N. hyadesi
Acanthochitonidae      
Acanthochitona crinita   +   Yonge (1939)  
Acanthochitona fascicularis   + +** Blumrich (1891); Plate (1901); Haszprunar (1981, 1987) Partly as A. communis
Cryptoconchus porosus   +   Plate (1901)  
Notoplax violacea   +   Plate (1901)  
Cryptoplacidae      
Cryptoplax oculatus   +   Plate (1901)  
  1. The marking for the osphradium indicates whether or not it was found posteriorly next to the anus. Not included is the anterior olfactory organ observed by several authors: in Lepidopleurus cajetanus and “Chiton” laevis (Blumrich, 1891), Ischnochiton herdmani (Stenoplax alata) and I. aequigranulatus (I. bouryi) (von Knorre 1925), Lepidochitona cinereus but not Leptochiton asellus, (Yonge 1939), Callochiton septemvalvis (Thiele, 1985), and“Boreochiton (Pelseneer 1898).
  2. *Plate (1899, p. 163) explained that osphradia are missing but corrected in Plate (1901, p. 427) bo – branchial sense organ; O – osphradium; lo – lateral sense organ.
  3. **Referred to as “osphradium” by Blumrich (1891) but see detailed review in the main text.