Description: Very small uniseriate filaments of profusely branched prostrate endophytic axes and erect tufted axes to 5 mm.

Habitat: Rare. Epiphyte on Nemalion helminthoides, midlittoral.

Distribution: British Isles: the Shetlands and the Isle of Man. Europe: Mediterranean, Baltic Sea and Denmark. Further afield: Canary Islands and Bermuda.

Similar Species: All species of Acrochaetium and Colaconema are similar, microscopic examination is required for identification.

Distribution Map from NBN: Colaconema nemalionis at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Colaconema nemalionis at iNaturalist World Species Observations database.

WoRMS: Colaconema nemalionis at World Register of Marine Species. Accepted name: Colaconema nemalionis (De Notaris ex L.Dufour) Stegenga, 1985. AphiaID: 162875.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Nemaliophycidae; Colaconematales; Colaconemataceae; Colaconema