The phrase "a proboscis of" is correct and usable in written English.
It can be used when describing a specific type of proboscis belonging to an organism, often in a biological or zoological context.
Example: "The butterfly's proboscis of remarkable length allows it to reach nectar deep within flowers."
Alternatives: "a snout of" or "a trunk of".
For example, a Madagascar orchid, Angraecum sesquipedale, with a nectar receptacle 20 to 35 cm (8 to 14 inches) long, depends for its pollination exclusively on the local race of a hawkmoth, Xanthopan morganii, which has a proboscis of 22.5 cm (9 inches).
(1) The cost of maintaining a proboscis of a given length must be different for the two moth species (Fig. 9).
The sensory equipment of a proboscis of higher Lepidoptera includes mechanosensitive sensilla trichodea, chemoreceptive sensilla basiconica, and sensilla styloconica (Altner & Altner, 1986; Paulus & Krenn, 1996; Krenn, 1998).
It can be argued that the functional costs and the reduced foraging efficiency due to the extended flower handling time (Kunte, 2007) is balanced by a rich amount of nectar, which is available only to these few insects possessing a proboscis of matching length.
Hypoxia during this period produced the most severe anomalies, including rare cases of HPE with a proboscis and even rarer instances of total obliteration of facial characteristics.
Between 24 and 48 hours of development, hypoxia produced the most severe anomalies, including rare cases of HPE with a proboscis and even rarer instances of total obliteration of facial characteristics.
Here's a bullet piercing an apple, an exploding bunch of roses, an x-ray of angel fish, a microscopic closeup of the proboscis of a hummingbird moth.
This fossil, however, only preserves the outline of the "worm", and there is no evidence of a proboscis, so there is no certainty that it represents a nemertean.
The guy with a monocoque of a proboscis was Emerson Fittipaldi.
Hippidion are characterized by a retracted nasal notch which has been interpreted as an adaptation to the presence of a proboscis and limbs with robust metapodials.
In a Hirst-esque glass tank, the proboscis of an industrial robot slowly traces the outline of a single stag's horn carved in wood.
