Dendrocoelidae is a
family
Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
of freshwater
tricladida
Planarians (triclads) are free-living flatworms of the class Turbellaria, order Tricladida, which includes hundreds of species, found in freshwater, marine, and terrestrial habitats.pp 3., "Planarians (the popular name for the group as a whole ...
flatworms that has a
holarctic
The Holarctic realm is a biogeographic realm that comprises the majority of habitats found throughout the continents in the Northern Hemisphere. It corresponds to the floristic Boreal Kingdom. It includes both the Nearctic zoogeographical reg ...
distribution.
The largest freshwater triclad known belongs to this family, it's up to 40 cm in length and inhabits the
Lake Baikal
Lake Baikal is a rift lake and the deepest lake in the world. It is situated in southern Siberia, Russia between the Federal subjects of Russia, federal subjects of Irkutsk Oblast, Irkutsk Oblasts of Russia, Oblast to the northwest and the Repu ...
.
Description
The family Dendrocoelidae is characterized by an unusual arrangement of the muscle layers of the pharynx. While in most planarians the inner musculature of the pharynx is composed of two muscle layers, one circular and one longitudinal, in Dendrocoelidae the circular and longitudinal fibers are intermingled, forming a mixed layer.
Dendrocoelidae is the sister group of
Kenkiidae
Kenkiidae is a family of freshwater triclads. Their species can be found sporadically in caves, groundwater, and deep lakes in Central Asia, Far East and North America.Ball, I. R.: A contribution to the phylogeny and biogeography of the freshwat ...
. Both families have an anterior adhesive organ, which is considered a
synapomorphy
In phylogenetics, an apomorphy (or derived trait) is a novel Phenotypic trait, character or character state that has evolution, evolved from its ancestral form (or Plesiomorphy and symplesiomorphy, plesiomorphy). A synapomorphy is an apomorphy sh ...
of the group.
Genera
The following genera are recognised in the family Dendrocoelidae:
*Genus ''
Acromyadenium''
*Genus ''
Alaoplana''
*Genus ''
Amyadenium''
*Genus ''
Anocelis''
*Genus ''
Archicotylus''
*Genus ''
Armilla''
*Genus ''
Atria
Atria may refer to:
Science
*Atrium (heart) (plural: atria), an anatomical structure of the heart
*Atria (genus), a flatworm genus in the family Dendrocoelidae
* Atria (star) or Alpha Trianguli Australis, a star in the constellation Triangulum Aus ...
''
*Genus ''
Baikalobia''
*Genus ''
Baikalocotylus''
*Genus ''
Baikaloplana''
*Genus ''
Bdellocephala''
*Genus ''
Caspioplana''
*Genus ''
Dendrocoelopsis''
*Genus ''
Dendrocoelum''
*Genus ''
Hyperbulbina''
*Genus ''
Hyperpapillina
Dendrocoelidae is a family of freshwater tricladida flatworms that has a holarctic distribution.
The largest freshwater triclad known belongs to this family, it's up to 40 cm in length and inhabits the Lake Baikal.
Description
The family ...
''
*Genus ''
Microarchicotylus''
*Genus ''
Miodendrocoelum
Dendrocoelidae is a family of freshwater tricladida flatworms that has a holarctic distribution.
The largest freshwater triclad known belongs to this family, it's up to 40 cm in length and inhabits the Lake Baikal.
Description
The family ...
''
*Genus ''
Papilloplana''
*Genus ''
Polycladodes
Dendrocoelidae is a family of freshwater tricladida flatworms that has a holarctic distribution.
The largest freshwater triclad known belongs to this family, it's up to 40 cm in length and inhabits the Lake Baikal.
Description
The family ...
''
*Genus ''
Procotyla
''Procotyla'' is a genus of freshwater planarian. Species of ''Procotyla'' are known from North America and Russia.
Conservation
''Procotyla typhlops'' is an endangered species in Maryland
Maryland ( ) is a U.S. state, state in the Mid ...
''
*Genus ''
Protocotylus
Dendrocoelidae is a family of freshwater tricladida flatworms that has a holarctic distribution.
The largest freshwater triclad known belongs to this family, it's up to 40 cm in length and inhabits the Lake Baikal.
Description
The family ...
''
*Genus ''
Rimacephalus
Dendrocoelidae is a family (biology), family of freshwater tricladida flatworms that has a holarctic distribution.
The largest freshwater triclad known belongs to this family, it's up to 40 cm in length and inhabits the Lake Baikal.
Descr ...
''
*Genus ''
Sorocelis
Dendrocoelidae is a family (biology), family of freshwater tricladida flatworms that has a holarctic distribution.
The largest freshwater triclad known belongs to this family, it's up to 40 cm in length and inhabits the Lake Baikal.
Descr ...
''
Phylogeny
Phylogenetic supertree after Sluys et al., 2009:
References
{{Authority control
Platyhelminthes families