Living BeingsCompare species
Scalloped Hammerhead
Sphyrna lewini
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 | Scalloped Hammerhead | Acropora millepora |
|---|---|---|
| Physical traits | The head is broad and flattened, with a curved, indented front margin. The body has a tall first dorsal fin and a pale underside. | Colonies form branching structures covered by small skeletal cups that house polyps. Colony color alone is insufficient for secure species identification. |
| Habitat and range | Coastal shelves, island slopes and offshore waters are used at different ages and times. | Shallow, well-lit marine reef environments support the coral and its photosynthetic partners. |
| Diet and nutrition | Fish and cephalopods are important prey. Feeding changes as sharks move from coastal juvenile habitat to deeper waters. | Polyps capture small suspended food, while algal symbionts contribute photosynthetic products. |
| Behavior and activity | Schooling and movements between daytime gathering sites and feeding areas are characteristic in some populations. | Tentacles and mucus help the colony interact with surrounding seawater. Recognition mechanisms influence responses to microbes. |
| Reproduction and life cycle | Females give birth to live young. Shallow coastal habitats provide nursery areas for juveniles. | Colonies grow by producing additional polyps. Sexual reproduction can release gametes that develop into settling larvae. |
| Geographic distribution | The species occurs in warm seas around the world. Its presence is uneven, and local populations can be strongly depleted. | The species occurs in the Indo-Pacific reef region. Species-level locality records should accompany detailed range mapping. |
| Ecological role | These sharks are large marine predators and also host parasites and visiting cleaner fish. | Skeletal growth contributes reef structure and habitat. Symbiotic interactions are central to energy supply and colony health. |
| Distinctive adaptations | The expanded head spreads sensory organs across a broad surface, supporting prey detection. | A colonial body and partnerships with photosynthetic cells support growth in well-lit reef environments. |
| Conservation | Targeted fishing, bycatch and loss of nursery habitat are major pressures. Protection needs to consider more than adult aggregation sites. | 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.