Aporocidaris antarctica Mortensen, 1909 (original description)
Ctenocidaris Mortensen, 1910 (original description)
Ctenocidaris speciosa Mortensen, 1910 (original description)
Diadema ascensionis Mortensen, 1909 accepted as Diadema antillarum ascensionis Mortensen, 1909 (original description)
Echinophyces Mortensen, 1909 (original description)
Echinophyces mirabilis Mortensen, 1909 (original description)
Eucidaris tribuloides africana Mortensen, 1909 accepted as Eucidaris tribuloides (Lamarck, 1816) (original description)
Eucidaris tribuloides var. africana Mortensen, 1909 accepted as Eucidaris tribuloides (Lamarck, 1816) (original description)
Notocidaris Mortensen, 1909 (original description)
Notocidaris gaussensis Mortensen, 1909 (original description)
Notocidaris hastata Mortensen, 1909 (original description)
Plexechinus nordenskjöldi Mortensen, 1905 accepted as Plexechinus nordenskjoeldi Mortensen, 1905 accepted as Antrechinus nordenskjoldi (Mortensen, 1905) (basis of record)
Protocentrotus annulatus Mortensen, 1909 accepted as Parechinus angulosus (Leske, 1778) (original description)
Rhynchocidaris triplopora (Mortensen, 1909) (original description)

Antarctic 200NM zone beyond the coastline for Antrechinus drygalskii (Mortensen, 1905) 
Antarctic 200NM zone beyond the coastline for Antrechinus nordenskjoldi (Mortensen, 1905) 
Antarctic 200NM zone beyond the coastline for Aporocidaris milleri (A. Agassiz, 1898) 
Antarctic 200NM zone beyond the coastline for Aporocidaris milleri (A. Agassiz, 1898) 
Antarctic 200NM zone beyond the coastline for Cystechinus wyvillii A. Agassiz, 1879 
Antarctic 200NM zone beyond the coastline for Echinosigra amphora Mironov, 1974 
Antarctic 200NM zone beyond the coastline for Notocidaris gaussensis Mortensen, 1909 
Antarctic 200NM zone beyond the coastline for Notocidaris hastata Mortensen, 1909 
Antarctic 200NM zone beyond the coastline for Rhynchocidaris triplopora (Mortensen, 1909) 
Antarctic 200NM zone beyond the coastline for Sterechinus antarcticus Koehler, 1901 
Antarctic 200NM zone beyond the coastline for Sterechinus neumayeri (Meissner, 1900) 
Antarctic 200NM zone beyond the coastline for Sterechinus neumayeri (Meissner, 1900) 
Antarctic 200NM zone beyond the coastline for Urechinus naresianus A. Agassiz, 1879 
Kerguelen Exclusive Economic Zone for Abatus cordatus (Verrill, 1876) 
Kerguelen Exclusive Economic Zone for Sterechinus diadema (Studer, 1876) 

 Association

 for Eucidaris tribuloides africana Mortensen, 1909

Crepidula attached to aboral spines [details]

 Taxonomic remark

 for Echinophyces Mortensen, 1909

Mortensen (1909) described a putative parasitic filamentous microorganism living in the spines of Antarctic ... [details]

 Taxonomic remark

 for Echinophyces mirabilis Mortensen, 1909

Mortensen (1909) described a putative parasitic filamentous microorganism living in the spines of Antarctic ... [details]