Phyllodesmium longicirrum

(Bergh, 1905)

Phyllodesmium longicirrum
Photographed by: Dave Harasti

According to Dr. Richard Willan: It is the only species of Phyllodesmium to have the branching ducts of the digestive gland (white ducts) extending into the head, oral tentacles, rhinophores and foot as well as the cerata, and also the accumulations of zooxanthellae at the end of these branches (brown masses) form a circular pattern at the surface. These characteristics, in combination with the flattened upper section of the cerata, appear to me to justify either generic or subgeneric distinction from Phyllodesmium. In fact the genus Myrrhine used to be used just for Phyllodesmium longicirrum and a phylogenetic analysis of all species now known in the genus may well show it to be valid.

Species:Phyllodesmium longicirrum

Comment from Richard Willan on photo #319
Single cerata showing branching ducts of the digestive gland internally (white ducts) and accumulations of zooxanthellae at the surface at the end of these branches (brown masses).



Pictures of Phyllodesmium longicirrum

Phyllodesmium longicirrum from Loloata, PNGIdentification reviewed by Richard Willan
Location: Loloata, PNG
Posted 9 years ago
Viewed 2510 times
« Phyllidiopsis shireenae | Other species from Loloata, PNG | Pseudoceros susanae »