Table 3 Comparison of the number of chromosomes, number of chiasmata per meiotic cell, and expected and observed map lengths in ambystomatid and salamandrid salamanders
Expected Map Length (cM) Based on
SpeciesNo. of ChrNo. of ArmsNo. of ChiasNo. of ArmsNo. of ChiasObserved Map Length (cM)
 Ambystoma macrodactylum1428a53a14002650NA
 Ambystoma mexicanumb1428113140056504200c
 Ichthyosaura alpestris1224d32.3e12001615NA
 Lissotriton boscai1224d21.7e12001085NA
 Lissotriton helveticus1224d22.2e12001110NA
 Lissotriton montandoni1224d23.3f120011651484g
 Lissotriton vulgaris1224d24.2h12001210
 Notophthalmus viridescens1122dNA1100NA6162i
 Pleurodeles waltl1224d28.1j12001405NA
 Salamandra salamandra1224d36.8k12001840NA
 Triturus carnifex1224d31.4l12001570NA
 Triturus cristatus1224d37.4l12001870NA
 Triturus karelinii1224d40.8l12002040NA
 Triturus marmoratus1224d25.7e12001285NA
  • Expected map length based on the number of chromosomal arms assumes a single crossover per arm. No. of chr, haploid number of chromosomes; No. of arms, number of chromosomal arms; No. of chias, average number of chiasmata per meiotic cell; NA, not available.

  • a Kezer et al. (1980).

  • b Callan (1966); Smith et al. (2005).

  • c Voss et al. (2011).

  • d All salamandrids are characterized by biarmed chromosomes (Sessions 2008).

  • e Herrero and López-Fernández (1986).

  • f Zbożeń and Rafiński (1993); Zbożeń (1997).

  • g This study.

  • h L. vulgaris meridionalis (Barsacchi et al. 1970).

  • i Keinath et al. (2016).

  • j Wickbom (1945).

  • k Mancino et al. (1969).

  • l Callan and Spurway (1951).