Question: What genus are both the red squirrel and the Calabrian black squirrel a part of?

Context paragraphs:
Black squirrel monkey: The black squirrel monkey ("Saimiri vanzolinii"), also known as the blackish squirrel monkey or black-headed squirrel monkey, is a small New World primate, endemic to the central Amazon in Brazil.  It largely resembles the female of the far more common Bolivian squirrel monkey, though the latter lacks the black central back.

Black Squirrel Creek Bridge: The Black Squirrel Creek Bridge carries U.S. 24 over Black Squirrel Creek in El Paso County, Colorado.  Prior to 2012, it was locally known as the "green bridge" or "old green bridge" -- a historic single-span, Parker through truss bridge that was completed in 1935 and listed on the National Register of Historic Places in 2002.  Because it no longer met highway safety standards, the bridge was dismantled and replaced by a newer span in 2012.

Black Squirrel Radio: Black Squirrel Radio (BSR) is an Internet radio station run by students of Kent State University, broadcasting exclusively online.  Black Squirrel Radio is overseen by faculty from Kent State University's Journalism and Mass Communication program.

Miniver: Miniver is an unspotted white fur derived from the winter coat of the ermine, or, originally, from the winter coat of the red squirrel; frequently used in the robes of British peers.  Miniver differs from ordinary ermine fur in that it does not include the distinctive black tails of the animals.  From a red squirrel, which has a greyish-white winter coat with a white underside, miniver gros is the whole fur, including the grey, and miniver pure retains only the white part.

Calabrian black squirrel: The Calabrian black squirrel ("Sciurus meridionalis") is a species of tree squirrel in the genus "Sciurus", endemic to the forests of the regions of Calabria and Basilicata, in the south of the Italian Peninsula.  It has been long considered a subspecies of "Sciurus vulgaris", the Eurasian red squirrel, but a 2017 scientific survey brought genetic evidence of being a distinct species.

Mount Graham red squirrel: The Mount Graham red squirrel ("Tamiasciurus hudsonicus grahamensis") is an endangered subspecies of the American red squirrel ("Tamiasciurus hudsonicus") native to the Pinaleño Mountains of Arizona.  It is smaller than most other subspecies of red squirrel, and also does not have the white-fringed tail that is common to the species.  Its diet consists mainly of mixed seeds, conifer cones and air-dried fungi.  It exhibits similar behavior to other squirrels in its species.

American red squirrel: The American red squirrel ("Tamiasciurus hudsonicus") is one of three species of tree squirrel currently classified in the genus "Tamiasciurus", known as the pine squirrels (the others are the Douglas squirrel, "T. douglasii", and Mearns's squirrel, "T. mearnsi").  American red squirrels are also referred to as pine squirrels, North American red squirrels, boomers, and chickarees.  They are medium-sized (200–250 g) diurnal mammals that defend a year-round exclusive territory.  The diet of these tree squirrels is specialized on the seeds of conifer cones.  As such, they are widely distributed across North America wherever conifers are common, except on the Pacific coast, where they are replaced by Douglas squirrels.  Recently, American red squirrels have been expanding their range to include primarily hardwood areas.

Black squirrel: The black squirrel occurs as a "melanistic" subgroup of both the eastern gray squirrel and the fox squirrel.  Their habitat extends throughout the Midwestern United States, in some areas of the Northeastern United States, eastern Canada, and also in the United Kingdom.  The overall population of black squirrels is small when compared to that of the gray squirrel.  The black fur color can occur naturally as a mutation in populations of gray squirrels, but it is rare.  The rarity of the black squirrel has caused many people to admire them, and the black squirrels enjoy great affection in some places as mascots.  In several U.S. states, as well as in Canada and the United Kingdom, black squirrels have been introduced into the wild in the hope of increasing their numbers.

Douglas squirrel: The Douglas squirrel ("Tamiasciurus douglasii") is a pine squirrel found in the Pacific coastal states and provinces of North America.  It is sometimes known as the chickaree or pine squirrel, although these names are also used for the American red squirrel.  Variant spellings of the common name are Douglas' squirrel and Douglas's squirrel.  The Native Americans of Kings River called it the "Pillillooeet", in imitation of its characteristic alarm call.

Red squirrel: The red squirrel or Eurasian red squirrel ("Sciurus vulgaris") is a species of tree squirrel in the genus "Sciurus" common throughout Eurasia.  The red squirrel is an arboreal, omnivorous rodent.

Supporting paragraphs: Calabrian black squirrel Red squirrel
Answer: Sciurus