Read and write two-part scientific names
Distinguish the genus from the species-specific part of an internationally shared name.
Section 1.2 · Concept and uses of classification systems
Core and Extended; Biology 0610, 2026–2028. Use the stated specimen features and evidence. Diagrams are schematic. Written practice is self-checked
Before you begin
- Read the stated observations before choosing a group.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which part of a binomial gives the genus?
What you will learn
- Identify the genus and species-specific part.
- Use consistent scientific-name conventions.
Two parts work together
The binomial naming system gives a species an internationally agreed two-part name. The first part gives the genus; the second distinguishes the species within that genus. The complete two-part expression names the species. Different species may share a genus.
For example, Panthera leo and Panthera tigris share Panthera but have different second parts. Using only leo does not provide the complete scientific name and may be ambiguous outside its genus.
Write names carefully
Begin the genus with a capital letter and the species-specific second part with a lowercase letter. Printed scientific names are conventionally italicised; when handwriting, underline the two parts separately. Common names can vary between places, which is why the shared scientific system helps communication.
A name is a label, not a complete description of every feature or a proof of reproductive compatibility. After the complete name has been given, a genus can sometimes be abbreviated in an unambiguous context, but write both parts in these practice answers.
Pause and explain
Which written form uses the correct capitals?
Worked example
In Homo sapiens, identify the genus and explain why sapiens alone is incomplete.
Show the worked solution
- Homo is the first part and gives the genus.
- sapiens is the species-specific second part.
- Both are needed for the complete species name.
Answer Genus: Homo; complete name: Homo sapiens.
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Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
For Felis catus, identify the genus and give the complete scientific name.
Give me a hint
Separate first part from the complete binomial.
Compare my reasoning
- The first part is Felis.
- The second part is catus.
- The complete name uses both.
Genus: Felis; complete name: Felis catus.
Look for these in your work
- Correct genus.
- Retain both parts for the species name.
Correct the capitals in panthera Leo and describe the handwriting convention.
Give me a hint
Capitalise only the genus initial.
Compare my reasoning
- Change panthera to Panthera.
- Change Leo to leo.
- Underline each part separately when handwritten.
Panthera leo, with each part underlined separately by hand.
Look for these in your work
- Correct both capitals.
- State the formatting convention.
Two records use the same common name for different organisms. Explain how complete scientific names improve the record.
Give me a hint
Focus on a shared international label.
Compare my reasoning
- Common names vary between regions.
- A two-part scientific name identifies the intended species.
- Including both parts reduces ambiguity.
Use each complete genus-plus-species name to distinguish the records internationally.
Look for these in your work
- Explain common-name ambiguity.
- Require both scientific-name parts.
Common mistakes
- A shared genus does not mean the same species.
- The second part alone is not the complete species name.
What can you explain now?
Do Panthera leo and Panthera tigris have the same complete species name?
Compare with the explanation
No.
They share a genus but have different species-specific second parts.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Write two binomials sharing a genus and explain what each part tells you.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.