The phrase "are hypothesized to have" is correct and usable in written English.
It can be used in academic or scientific contexts when discussing theories or assumptions about a subject or phenomenon.
Example: "The researchers believe that these ancient civilizations are hypothesized to have developed advanced agricultural techniques."
Alternatives: "are thought to possess" or "are believed to have".
…sirenians are together classified as tethytherians, in reference to the ancient sea of Tethys, where both groups are hypothesized to have originated.
Four-domain channels are hypothesized to have evolved from a single-domain ancestor by two rounds of internal duplication [2].
Background: A subgroup has emerged within the obese that do not display the typical metabolic disorders associated with obesity and are hypothesized to have lower risk of complications.
Marine n-3 fatty acids are hypothesized to have beneficial effects on obesity and cancer cachexia possibly via an effect on appetite.
Furthermore, the lower metamorphic P-T conditions in Tongbaishan relative to the Dabie Sulu region are hypothesized to have resulted from a shallower subduction.
Migratory birds are hypothesized to have spread WNV in temperate areas of the Old and New World, and human WNV outbreaks in North America have been associated with corresponding WNV outbreaks in wild birds2,3.
These two heteromer's are hypothesized to have arisen due to a gene inversion event having occurred at some time during the evolution of aphids, resulting in a novel two-subunit channel.
According to current thinking, birds are hypothesized to have shared a common ancestor with the dromaeosaurs sometime in the Jurassic period; Dromaeosauridae is thus termed the sister group of the clade Aves (which includes all birds).
While many environmental exposures are hypothesized to have contributed to the global asthma epidemic that started in the latter half of the 20th century, a unifying theory has not been proven.
All these conventional and non-conventional factors of production are hypothesized to have yield-augmenting effects.
Alus play critical roles in the formation of neurological networks and the epigenetic regulation of biochemical processes throughout the central nervous system (CNS), and thus are hypothesized to have contributed to the origin of human cognition.
