The phrase "almost the same species" is correct and usable in written English.
It can be used in contexts discussing biological classifications or comparisons between similar organisms.
Example: "The two plants are almost the same species, differing only in their leaf shape."
Alternatives: "nearly identical species" or "very similar species".
Other plankton observed were almost exactly the same species at St. 1 and 2 and at low density (Fig. 6).
Grand Teton National Park is an almost pristine ecosystem and the same species of flora and fauna that have existed since prehistoric times can still be found there.
Members of the same species are almost identical in their physical characteristics.
Faced with an intruder of the same species, it will almost immediately begin scraping an oar-shaped appendage on its tail end across the leaf.
Although its coat is almost entirely white, the Spirit Bear belongs to the same species, Ursus americanus, as the ordinary black bear.
For the same species, population size almost did not affect the accuracy and stability of the two sampling algorithms.
One kind contains the highly conserved genes across different species; take two strains from the same species as an example, almost all genes are highly conserved genes, and the other kind contains the genes located on fragments with abnormal genome barcode.
These nuclear species share territories with other nuclear species but exclude conspecifics (members of the same species) and are found in almost all flocks; these are joined by "attendant species".
EOs from the same species but from different origins presented almost the same spectra, showing the possibility that EEM spectra could be used as additional parameters in the standardisation of EOs.
When plants of the same species occurred within the same site, almost all their bacterial communities clustered together exhibiting a plant species effect.
