Polycladus

Polycladus
	Polycladus gayi
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Platyhelminthes
Order:	Tricladida
Family:	Geoplanidae
Genus:	Polycladus
Species:	P. gayi
Binomial name
	Polycladus gayi; Blanchard, 1847
Synonyms
	Geoplana gayi Schultze & Müller, 1857

Polycladus is a genus of land planarians from South America, currently comprising a single species, Polycladus gayi, which occurs in the Valdivian Forest, Chile.

Description

Polycladus is a very understudied genus of land planarians. It was defined as land planarians with a wide, flat and leaf-like body, having the entire ventral surface ciliated and with mouth and gonopore posteriorly shifted in relation to other land planarians. The copulatory apparatus has a well-developed permanent penis and the female canal enters the genital antrum ventrally.[1] This definition, however, is incomplete regarding all anatomical structures currently considered in the definition of planarian genera.[2]

Etymology

The name Polycladus comes from Greek πολύ (many) + κλάδος (branch), referring to the branched intestine. Despite the name, Polycladus is not a species of the flatworm order Polycladida, but rather of Tricladida.

The specific epithet of the type-species, gayi, commemorates French naturalist Claude Gay.[3]

References

Ogren, R. E. and Kawakatsu, M. (1990). Index to the species of the family Geoplanidae (Turbellaria, Tricladida, Terricola) Part I: Geoplaninae. Bulletin of Fujis Women's College. 29: 79-166.
Carbayo, F.; Álvarez-Presas, M.; Olivares, C. U. T.; Marques, F. P. L.; Froehlich, E. X. M.; Riutort, M. (2013). "Molecular phylogeny of Geoplaninae (Platyhelminthes) challenges current classification: Proposal of taxonomic actions". Zoologica Scripta. 42 (5): 508. doi:10.1111/zsc.12019.
Blanchard, Émile (1847). "Recherches sur l'organisation des vers". Annales des Sciences Naturelles, Zoologie. 3e série. 8: 119–149. doi:10.5962/bhl.title.51506. hdl:2027/uiuo.ark:/13960/t8gf1q10b.

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[Ogren90-1] Ogren, R. E. and Kawakatsu, M. (1990). Index to the species of the family Geoplanidae (Turbellaria, Tricladida, Terricola) Part I: Geoplaninae. Bulletin of Fujis Women's College. 29: 79-166.

[Carbayo2013-2] Carbayo, F.; Álvarez-Presas, M.; Olivares, C. U. T.; Marques, F. P. L.; Froehlich, E. X. M.; Riutort, M. (2013). "Molecular phylogeny of Geoplaninae (Platyhelminthes) challenges current classification: Proposal of taxonomic actions". Zoologica Scripta. 42 (5): 508. doi:10.1111/zsc.12019.

[Blanchard1847-3] Blanchard, Émile (1847). "Recherches sur l'organisation des vers". Annales des Sciences Naturelles, Zoologie. 3e série. 8: 119–149. doi:10.5962/bhl.title.51506. hdl:2027/uiuo.ark:/13960/t8gf1q10b.