Body wall musculature primarily three layered (outer longitudinal, middle circular, inner longitudinal), sometimes with additional thin inner circular and/or outer oblique layers; dermis well developed and normally composed of fibrous connective tissues and gland cells; central nervous system situated between outer longitudinal and middle circular muscle layers.
Source: Gibson, 1982.
The following taxa of this order occur in the region:
Family Cerebratulidae
Genus Cerebratulus
Family Lineidae
Genus Lineus
Genus Micrura
Cerebratulus fuscus
Cerebratulus marginatus
Lineus albocinctus
Lineus bilineatus
Lineus lacteus
Lineus longissimus
Lineus ruber
Lineus sanguineus
Lineus viridis
Micrura fasciolata
Micrura purpurea