Cladonematidae

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Phylum: Cnidaria
Cladus: Medusozoa
Classis: Hydrozoa
Ordo: Capitata
Familia: Cladonematidae
Genus: Cladonema

Cladonematidae is a small family of anthomedusan hydrozoans. They have stolonal hydroid colonies, and their medusae are benthic and can crawl across the sediment; in many species they have lost the ability to swim however.[1]

Description

The hydranths carry a single whorl of mouth tentacles which each bear a little knob at the tip; in some Cladonematidae an aboral whorl of thread-like unknobbed tentacles is also present. They have a preoral chamber formed by epidermal gland cells.[1]

The medusae bud off at the base of the hydrants, though where aboral tentacle are present these are located between the stolons and the budding sites. Cladonematidae medusae have a various extend of nematocysts around their umbrellar margin, varying between a continuous dense ring to none at all among the species. The number of radial canals and whether they are branched or not is variable in this family. Their marginal is branched, with nematocyst clusters on the upper and adhesive organs on the lower branches. The manubrium is cylindrical and in some has perradial pouches and/or above it a brood pouch; the gonads either surround the manubrium entirely or are carried on manubrial extrusions or (if present) the brood pouch. The mouth is bordered either with clusters of nematocysts, or with short lips of tissue, or fringed with branching tentacles. The tentacle bases abaxially bear ocelli.[1]

Genera

There are a mere 3 genera, one of which might not be valid:[2]

Cladonema Dujardin, 1843
Dendronema Haeckel, 1879
Stauridium (doubtfully distinct from Cladonema)

Footnotes

^ a b c Schuchert [2009]
^ WoRMS

References

World Register of Marine Species (WoRMS) (2004): Cladonematidae. Version of 2004-DEC-21. Retrieved 2009-APR-08.
Schuchert, Peter [2009]: The Hydrozoa Directory - Family Cladonematidae. Retrieved 2009-APR-08.