from “Wikipedia”
<==o Sorberacea `--o Aspiraculata `--o Hexacrobylidae |--o Gasterascidia | |-- C. lyra Monniot C. & Monniot F., 1973 | `-- C. sandersi Monniot C. & Monniot F., 1968 |--o Hexadactylus | |-- H. arcticus (Hartmeyer, 1923) | |-- H. eunuchus (Monniot F. & Monniot C., 1976) | `-- H. ledanoisi (Monniot F. & Monniot C., 1990) |--o Oligotrema | |-- O. lyra | `-- O. psammites `--o Sorbera |-- S. unigonas Monniot C. & Monniot F., 1974 `-- S. digonas
Reference(s):
- Anomymous, 2013: Aspiraculata [last updated: 2013-03-14]
–iNet: Wikipedia: http://en.wikipedia.org/wiki/Aspiraculata[last visited: 2013-03-23] - Bouchet, P., 1999: Tunicata: Brief checklist.
–iNet: European Register of Marine Species: http://erms.biol.soton.ac.uk/list/brief/tunicata.shtml
Special thanks to:
Jos H. M. Dols, for gathering information and species of these animals.