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Table 1 Comparative cytogenetic data of Symbranchidae species

From: Karyotype diversity and evolutionary trends in the Asian swamp eel Monopterus albus (Synbranchiformes, Synbranchidae): a case of chromosomal speciation?

Species Site sampling 2n NF Karyotype Reference
Monopterus albus Central of Thailand 18 24 6 m + 12a [6]
Northeast of Thailand 24 24 24a [6]
Central of Thailand 24 24 24a [8]
China 24 24 24a [7]
M. cuchia India 42 46 4sm + 38a [33]
Ophisternon aenigmaticum La Vega, Garcia, Venezuela 45 51 6 m + 39a [9]
EL Valle, Garcia, Venezuela 46 52 6 m + 40a  
O. bangalense Southeast coast of India 46   42 m + 4sm [34]
Synbranchus lampreia Lago Catalão 44 50 6 m + 2st + 36a [19]
S. madeirae Lago Catalão 46 52 6 m + 2st + 38a  
S. marmoratus Bataguassu – MS, Igaraçu do Tietê – SP, Pirassununga – SP, Icém – SP, Cáceres – MT, BR 42 46 4 m + 12st + 26a [14]
Synbranchus marmoratus Coxim, MS, BR 42 46 4 m,sm + 38st,a [10]
São Simão, GO, BR 42 46 4 m,sm + 38st,a
Nova Granada, SP, BR 42 46 4 m,sm + 38st,a
Botucatu, SP, BR 42 46 4 m,sm + 38st,a [11]
Birigui, SP, BR 42 46 4 m,sm + 38st,a
ParaguaçuPaulista, SP, BR 42 46 4 m,sm + 38st,a
Pirassununga, SP, BR 42 48 6 m,sm + 36st,a
RibeirãoPreto, SP, BR 42 48 6 m,sm + 36st,a
Bataguaçu, MS, BR 42 48 6 m,sm + 36st,a
Guaíra – PR, BR 42 48 6 m + 10st + 26a [14]
Londrina, PR, BR 42 52 4 m + 2sm + 8st + 28a [13]
Guairá, PR, BR 42 52 4 m + 2sm + 8st + 28a
Miranda, MS, BR 42 52 4 m + 2sm + 8st + 28a
Pereiras, SP, BR 42 52 4 m + 6sm + 8st + 24a
PresidenteEpitácio, SP, BR 42 52 4 m + 6sm + 8st + 24a
Rio Claro, SP, BR 44 48 4 m,sm + 40st,a [10]
Pentecostes, CE, BR 44 48 4 m,sm + 40st,a
  Botucatu, SP, BR 44 48 4 m,sm + 40st,a [11]
Birigui, SP, BR 44 48 4 m,sm + 40st,a
Bataguaçu, MS, BR 44 48 4 m,sm + 40st,a
Ituzaingó, Corrientes, AR 44 48 4 m,sm + 40st,a [12]
Reconquista, Santa Fé, AR 44 48 4 m,sm + 40st,a
Garabato, Santa Fé, AR 44 48 4 m,sm + 40st,a
Cerrito – RS, Rio Branco – AC, BR 44 48 4 m + 10st + 30a [14]
Pirassununga, SP, BR 44 50 4 m + 2sm + 8st + 30a [13]
Pirassununga, SP, BR 46 50 4 m,sm + 42st,a [11]
RibeirãoPreto, SP, BR 46 50 4 m,sm + 42st,a
Bandeirantes, PR, BR 46 52 4 m + 2sm + 8st + 32a [13]
Igaraçu do Tietê – SP, Pirassununga – SP, BR 46 52 4 m + 10st + 32a [14]
Pirassununga – SP, Icém – SP, BR 46 52 6 m + 10st + 30a
  Miranda, MS, BR 46 54 6 m + 2sm + 6st + 32a [13]
  1. Notes: BR Brazil, AR Argentina, 2n diploid number, NF fundamental number, m metacentric, sm submetacentric, st subtelocentric and a acrocentric chromosomes