The main species in each clade are:
B. microti (<3 µm)
B.  duncani
B. divergens (cattle parasite seen mostly in Europe) and B. venatorum (roe deer parasite, formerly called EU1), most closely related to the large Babesia clade
Large Babesia (>3 µm) mostly infects ungulates, but also includes K01 strain (an isolated case observed in South Korea, see isolated cases)

Pathophysiology
Babesia parasites reproduce in red blood cells, where they can be seen as cross-shaped inclusions (four merozoites asexually budding, but attached together forming a structure looking like a "Maltese cross") and cause hemolytic anemia, quite similar to malaria. Unlike the Plasmodium parasites that cause malaria, Babesia species lack an exoerythrocytic phase, so the liver is usually not affected.In nonhuman animals, Babesia canis rossi, Babesia bigemina, and Babesia bovis cause particularly severe forms of the disease, including a severe haemolytic anaemia, with positive erythrocyte-in-saline-agglutination test indicating an immune-mediated component to the haemolysis. Common sequelae include haemoglobinuria "red-water", disseminated intravascular coagulation, and "cerebral babesiosis" caused by sludging of erythrocytes in cerebral capillaries.In bovine species, the organism causes hemolytic anemia, so an infected animal shows pale mucous membranes initially. As the levels of bilirubin (a byproduct of red blood cell lysis) continue to increase, the visible mucous membranes become yellow in color (icterus) due to the failure of the liver to metabolize the excess bilirubin. Hemoglobinuria is seen due to excretion of red-blood-cell lysis byproducts via the kidneys. Fever of 40.5 °C (105 °F) develops due to release of inflammatory byproducts.
"Clinical Practice Guidelines by the Infectious Diseases Society of America (IDSA): 2020 Guideline on Diagnosis and Management of Babesiosis". Clinical Infectious Diseases. 72 (2): e49–e64. doi:10.1093/cid/ciaa1216. Homer MJ, Aguilar-Delfin I, Telford SR, Krause PJ, Persing DH (July 2000). "Babesiosis". Clin. Microbiol. Rev. 13 (3): 451–69. doi:10.1128/CMR.13.3.451-469.2000. PMC 88943. PMID 10885987. "Babesiosis: Overview"—The Merck Veterinary Manual
Current status of Equine piroplasmosis worldwide at OIE. WAHID Interface—OIE World Animal Health Information Database
Disease card—OIE