Molluscan ResearchISSN 1323-5818
 An international journal of the Malacological Society of Australasia and 
the Society for the Study of Molluscan Diversity published by Magnolia Press

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Molluscan Research 30(2): 113-116; published 30 Jul. 2010
Copyright © The Malacological Society of Australasia & the Society for the Study of Molluscan Diversity

Karyotypes in Onchidium struma (Gastropoda: Pulmonata: Systellommatophora)


Key Laboratory of Aquatic Genetic Resources and Aquaculture Ecosystem Certificated by the Ministry of Agriculture,

Shanghai Ocean University, 999 Hucheng Huan Road 201306, Shanghai, China.

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Karyological analysis was performed on the ovotestis of Onchidium struma with flame-drying techniques. The ovotestis chromosome numbers are 18 haploid and 36 diploid without exception. The mitotic chromosome complement has 13 metacentric pairs and five submetacentric pairs with the karyotype formula n= 13M+5SM. This is the first study undertaken on chromosomes of O. struma with fine mitotic metaphases, making an explanation the ring-shaped chromosomes. Compared with other onchidellids recorded in the literature, the haploid number (18) of O. struma is the same as Onchidium verraculaturn and Onchidella evelinae but is one bivalent more than Onchidella kurodai.

Key words: ovotestis, flame-drying, diploid, haploid, chromosome number

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