- The ancestral annelid had 20 chromosomes, syntenic to the ancestral
bilaterian linkage groups, but the genome of leeches and earthworms was
extensively reshuffled ([[Lewin, Liao and Luo,
- 2024|biblio/10.1101_2024.05.15.594353]]).
+ 2024|biblio/10.1101_2024.05.15.594353]], [[Vargas-Chávez and coll.,
+ 2024|biblio/10.1101_2024.05.16.594344]]). Vargas-Chávez and coll. proposed
+ that this happened by chromoanagenesis.
- The Eleutherozoa Linkage Groups descend from a single fusion of ancestral
bilaterian linkages B2 and C2 ([[Parey and coll., 2023|biblio/10.1101_2023.10.30.564762]]).