Living BeingsCompare species
European Starfish
Asterias rubens
Acropora millepora
Acropora millepora
How to compare two organisms
Choose two species and trace their closest shared group. Then compare a trait with the same definition on each side. Check the units, life stage and context before interpreting a measurement or range.
Missing data means that the collection lacks a sourced value. Where a characteristic does not apply to a lineage, the comparison labels it separately. Open the two profiles for context and follow their sources before drawing a conclusion.
Evidence from the profiles
Compare their characteristics
| Trait | European Starfish | Acropora millepora |
|---|---|---|
| Physical traits | Adults usually have five broad arms around a central disc. The upper surface is rough, and color varies. | Colonies form branching structures covered by small skeletal cups that house polyps. Colony color alone is insufficient for secure species identification. |
| Habitat and range | Rocky, sandy and mixed seabeds support this starfish, including areas with abundant bivalves. | Shallow, well-lit marine reef environments support the coral and its photosynthetic partners. |
| Diet and nutrition | Bivalves are important prey. A starfish can use tube feet to gain access and digest food with its everted stomach. | Polyps capture small suspended food, while algal symbionts contribute photosynthetic products. |
| Behavior and activity | Slow movement across the seabed brings individuals into contact with food and other starfish. | Tentacles and mucus help the colony interact with surrounding seawater. Recognition mechanisms influence responses to microbes. |
| Reproduction and life cycle | Eggs and sperm are released into seawater. Larvae develop in the plankton before settling and changing into juveniles. | Colonies grow by producing additional polyps. Sexual reproduction can release gametes that develop into settling larvae. |
| Geographic distribution | The species is associated with the northeastern Atlantic and adjacent European seas. Local records are more informative than a generalized global range. | The species occurs in the Indo-Pacific reef region. Species-level locality records should accompany detailed range mapping. |
| Ecological role | Predation can influence shellfish communities. Its reproductive investment can change with temperature and food supply. | Skeletal growth contributes reef structure and habitat. Symbiotic interactions are central to energy supply and colony health. |
| Distinctive adaptations | A water-vascular system powers tube feet, and damaged arms can regenerate under suitable conditions. | A colonial body and partnerships with photosynthetic cells support growth in well-lit reef environments. |
| Conservation | Laboratory warming experiments reveal possible sensitivities, not a universal prediction for every wild population. No formal status is assigned here. | Thermal stress, bleaching and degradation of reef habitat are concerns. A source on molecular recognition does not establish a current Red List category. |
Classification
Shared ancestry
Closest shared taxon: Eumetazoa.