It's Binomial nomenclature [1]. The name should also be in italics, but not sure how that would be enabled in HN headlines.
> In modern usage, the first letter of the generic name is always capitalized in writing, while that of the specific epithet is not, even when derived from a proper noun such as the name of a person or place. Similarly, both parts are italicized in normal text (or underlined in handwriting).
Interesting. You're right, it is not capitalized in the original article. Although i still think the passage you are quoting is talking about normal text and not title case.
> When an animal name is part of a journal article title, it is conventional to provide the animal’s scientific name (genus and species). Genus is always capitalized and species is not. Notice that the scientific names are also italicized
> In modern usage, the first letter of the generic name is always capitalized in writing, while that of the specific epithet is not, even when derived from a proper noun such as the name of a person or place. Similarly, both parts are italicized in normal text (or underlined in handwriting).
[1] https://en.wikipedia.org/wiki/Binomial_nomenclature