Kalyptorhynchia
Suborder of rhabdocoel flatworms
From Wikipedia, the free encyclopedia
Kalyptorhynchia is a suborder of rhabdocoel flatworms. It contains almost 600 species and has a cosmopolitan distribution.[1]
| Kalyptorhynchia | |
|---|---|
| |
| Gyratrix hermaphroditus. | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Platyhelminthes |
| Order: | Rhabdocoela |
| Suborder: | Kalyptorhynchia Graff, 1905 |
| Subgroups | |
| |
Description
All kalyptorhynchs have an anterior muscular proboscis, which is used to capture prey. The proboscis is located inside an invagination of the epidermis called the proboscis-sheath that is closed by a sphincter at the tip of the body.[1] Another synapomorphy supporting the group is the incorporation of the axonemes within the cell body of sperm cells during spermiogenesis.[2]
Classification
Kalyptorhynchs are traditionally classified into two infraorders: Eukalyptorhynchia, with a cone-shaped proboscis, and Schizorhynchia, with a proboscis formed by two opposite parallel muscular sheets.[1] However, molecular studies have shown that Eukalyptorhynchia, as originally defined, is paraphyletic and includes Schizorhynchia. It becomes monophyletic if the family Cicerinidae is excluded.[1][2]
Current phylogenetic classification:[3]
| Kalyptorhynchia |
|
Eukalyptorhynchia sensu lato | ||||||||||||||||||