Heterodonta


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Heterodonta

[‚hed·ə·rə′dän·tə]
(invertebrate zoology)
An order of bivalve mollusks in some systems of classification; hinge teeth are few in number and variable in form.
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NC008451, AM77451 1, AM779685) and two species in the subclass Heterodonta (Mya arenaria Lamarck, 1809, accession no.
The somatic DNA content of these 2 Chilean Pisidium Pfeiffer 1821 species is within the range described previously for diploid Heterodonta, despite the fact that both showed a high chromosome number (>100-120 chromosomes) equivalent to the polyploid level described for other species of the genus.
Chromosome numbers in Heterodonta are variable and include principally diploid cytotypes with 2n from 20 in Cardiidae to 38 in Veneridae (Mendez et al.
The two Chilean Pisidium species studied here showed differences in their 2C values, but both are within the range described for diploid species of the subclass Heterodonta (range, 2.