Gersemia

Gersemia is a genus of soft corals in the family Nephtheidae. Species in this genus are found in cold temperate and polar seas at depths ranging from 20 metres (66 ft) to over 2,000 metres (6,600 ft). The type species is Gersemia loricata.

Gersemia
Gersemia antarctica
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Cnidaria
Subphylum:	Anthozoa
Class:	Octocorallia
Order:	Alcyonacea
Family:	Nephtheidae
Genus:	Gersemia Marenzeller, 1877 [1]
Species
See text

Characteristics

Colonies of Gersemia are arborescent, growing erectly with one main stem. The polyps are most numerous at the branch tips and are unable to retract into the calyces. The walls of the stalk and branches are stiffened with sclerites which are often brightly coloured. Corals in this genus do not contain zooxanthellae, the microalgae symbionts found in some other corals.^[2]

Species

The World Register of Marine Species includes the following species in the genus:^[1]

• Gersemia antarctica (Kükenthal, 1902)
• Gersemia carnea Verrill
• Gersemia clavata (Danielssen, 1887)
• Gersemia crassa (Danielssen, 1887)
• Gersemia danielsseni (Studer, 1891)
• Gersemia fruticosa Sars, 1860
• Gersemia hicksoni (Gravier, 1913)
• Gersemia japonica (Kükenthal, 1906)
• Gersemia juliepackardae Williams & Lundsten, 2009
• Gersemia lambi Williams, 2013
• Gersemia liltvedi (Verseveldt & Williams, 1988)
• Gersemia loricata von Marenzeller, 1878
• Gersemia marenzelleri Kükenthal, 1906
• Gersemia mirabilis (Danielssen, 1887)
• Gersemia rubiformis (Ehrenberg, 1834)
• Gersemia studeri Verrill
• Gersemia uvaeformis (May, 1900)