On reefs from India and the Maldive Islands to Chuuk Atoll, Micronesia, and from Queensland, Australia, to southern Vietnam (Cochinchina) and the Philippines. Shoreline to 48 m.

A species of Stephanometra with lateral margins of brachitaxis ossicles weakly swollen or with well-rounded lateral processes oriented parallel or obliquely to ray axis. At least distal cirrals with prominent aboral spine. Pinnulars of P₁ to P₄ and sometimes P₅ elongated, LW 1.5–3.5, with reduced ambulacral groove and conical terminal segment. Proximal and distal pinnular facets with elongated triangular fossae flanking ambulacral groove.

Syntype for Himerometra echinus Clark, 1908
Catalog Number: USNM 25442
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol)
Collector(s): United States Fish Commission
Year Collected: 1908
Locality: Sulu Archipelago, Tapul Group, Tapul Island, NW Of, Sulu, Philippines, North Pacific Ocean
Depth (m): 38 to 38
Vessel: Albatross R/V

Syntype for Stephanometra coronata Clark, 1909
Catalog Number: USNM 35242
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol)
Locality: India, Indian Ocean

Depth range based on 3 specimens in 1 taxon.
Water temperature and chemistry ranges based on 3 samples.

Environmental ranges
  Depth range (m): 6.35 - 38
  Temperature range (°C): 27.989 - 28.506
  Nitrate (umol/L): 0.201 - 0.919
  Salinity (PPS): 33.800 - 34.112
  Oxygen (ml/l): 4.503 - 4.588
  Phosphate (umol/l): 0.054 - 0.085
  Silicate (umol/l): 0.818 - 1.066

Graphical representation

Depth range (m): 6.35 - 38

Temperature range (°C): 27.989 - 28.506

Nitrate (umol/L): 0.201 - 0.919

Salinity (PPS): 33.800 - 34.112

Oxygen (ml/l): 4.503 - 4.588

Phosphate (umol/l): 0.054 - 0.085

Silicate (umol/l): 0.818 - 1.066
 
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