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The phrase "a second species" is correct and usable in written English.
It can be used when referring to an additional type or category within a classification, often in scientific or biological contexts.
Example: "The researchers discovered a second species of frog in the rainforest that had distinct coloration and behavior."
Alternatives: "another species" or "a different species".
Exact(60)
A few months later, in 1979, a second species, A. diabolusi, was named from Brazil.
A second species described by the pair was Carlia rubigo, given the common name orange-flanked rainbow skink.
A little later, Frank Kingdon Ward discovered a second species of Beesia in Burma which was named Beesia deltophylla.
A second species, Palaeoctopus pelagicus is known from a single gladius vestige from Mexico (Fuchs et al. 2008).
Adding a second species, he said, "is going to make it more difficult to get that ideal image" in the allotted space.
A second species (M. reedi) is known only from Isla San Felix, off the coast of Chile, and a third (M. neozelanicus) inhabits the southwestern Pacific Ocean.
Experimental studies of a population of grain beetles in a container of wheat show that the complexities increase if a second species is added.
Indeed, people infected pigs not only with Taenia asiatica but also with a second species of tapeworm, Taenia solium, which humans seem to have acquired either by eating each other or by eating dogs.
In a notice published in February, the agency proposed that the paintings continue to feature a waterfowl species, but also include, in a cameo role, a second species that might be found in the same habitat.
A second species of worm also triggers similar changes in the mice's intestines, the team confirmed.
Occasionally a second species of Phytophthora, P. kernoviae, was also recovered from needles with the same symptoms.
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