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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.