Lecithoepitheliata
Lecithoepitheliata | |
---|---|
Geocentrophora baltica | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Platyhelminthes |
Clade: | Amplimatricata
|
Order: | Lecithoepitheliata Reisinger, 1924 |
Families | |
|
The Lecithoepitheliata are an order of
Description
Members of the order Lecithoepitheliata are distinguished from other flatworms by the presence of four nerve cords and the fact that the ovary forms a single structure that produces both the eggs (
Phylogeny
The order Lecithoepitheliata is usually classified as belonging to the clade Neoophora, a subgroup of rhabditophoran flatworms distinguished by the presence of ectolecithal eggs, i.e., yolk is stored outside the ovocytes.[6] However, recent molecular studies have grouped Lecithoepitheliata (at least the family Prorrhynchidae) with the order Polycladida, which has endolecithal eggs, i.e., yolk is stored inside the ovocytes as in most animals.[5] Another previous study, which included representatives of both families of Lecithoepitheliata, concluded that Prorhynchidae is the basalmost clade of Neoophora, followed by Gnosonesimidae. In the former scenario, the ectolecithal condition would have evolved independently twice, and in the latter it would have arisen only once, but Lecithoepitheliata would be paraphyletic.[7]
Phylogeny of Lecithoepitheliata in relation to other rhabditophorans according to Laumer & Giribet (2011):[7]
Rhabditophora |
| ||||||||||||||||||||||||
Phylogeny according to Egger et al. (2015):[5]
Rhabditophora |
| ||||||||||||||||||
References
- ^ Adl, Sina M. (2006). "Observations on a Geocentrophora sp. (Lecithoepitheliata) flatworm from forest soils in Nova Scotia". Journal of Natural History 40(23-24): 1381.
{{cite journal}}
: Cite journal requires|journal=
(help) - ISBN 0-03-056747-5.
- S2CID 85892208. Retrieved 13 February 2023.
- ^ S2CID 21471933.
- ^ PMID 25866392.
- . Retrieved 13 February 2023.
- ^ ISSN 0024-4066.