There are over 100 coffee species, however the two main ones that are widely produced and sold are: Coffea Arabica and Coffea Canephora (also known as Coffea Robusta).
https://theroasterspack.com/blogs/news/15409365-10-differenc...

Robusta is a species of flowering plant in the family Rubiaceae. Though widely known by the synonym Coffea robusta, the plant is currently scientifically identified as Coffea canephora, which has two main varieties, C. c. robusta and C. c. nganda.
https://en.wikipedia.org/wiki/Robusta_coffee

Coffea arabica (/əˈræbɪkə/), also known as the Arabian coffee, "coffee shrub of Arabia", "mountain coffee", or "arabica coffee", is a species of Coffea. Indigenous to Yemen, it is believed to be the first species of coffee to be cultivated, and is the dominant cultivar, representing some 60% of global production.[1][2] Coffee produced from the less acidic, more bitter, and more highly caffeinated robusta bean (C. canephora) makes up the preponderance of the remaining balance.
https://en.wikipedia.org/wiki/Coffea_arabica

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Note added at 25 mins (2019-04-30 18:53:42 GMT)
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In biology, a species (/ˈspiːʃiːz/ // (About this soundlisten)) is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction
https://en.wikipedia.org/wiki/Species

Gatunek – w biologii podstawowa jednostka taksonomiczna, jedna z kategorii systematycznych oraz jednostka różnorodności biologicznej.
https://pl.wikipedia.org/wiki/Gatunek_(biologia)
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Two types of coffee are widely sold commercially: arabica, the highest quality and most affected by climate change, and robusta, which can grow in warmer conditions, but is less sought-after - https://www.marketwatch.com/story/why-your-latte-costs-nearl...