Proboscis


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proboscis

1. a long flexible prehensile trunk or snout, as of an elephant
2. the elongated mouthparts of certain insects, adapted for piercing or sucking food
3. any similar part or organ

Proboscis

 

(1) The narrowed anterior part of the body of invertebrates that performs a sensory function (in some turbellarians) or serves to gather food particles (in echiurids). In priapulids and sipunculids the proboscis retracts into the body. The term “proboscis” is also used to designate the sharply differentiated anterior section of Enteropneusta that serves for digging in the bottom.

(2) A special movable anterior organ in nemertinoids and some turbellarians that is used to capture prey. The proboscis is especially well developed in nemertinoids.

(3) A tubelike organ of attachment in parasitic worms, for example, thorny-headed worms and tapeworms. The proboscis is armed with hooks and is often retractile.

(4) The externally protruding tubular pharynx of some annelid worms, for example, polychaetes and leeches.

(5) In certain arthropods, mouth apparatus in the form of an elongate tube adapted for sucking liquid food. The proboscis may be a sucking organ (as in trichopterons, lepidopterons, hymenopterons, and some dipterons) or a stinging and sucking organ capable of piercing animal or plant integuments (as in ticks, Homoptera, hemipterons, thrips, lice, fleas, and certain dipterons).

A. V. IVANOV


Proboscis

 

in certain reptiles (soft river tortoises) and mammals (most insectivores, tapirs, male elephant seals, elephants) the movable elongate nasal part of the snout with nostrils at its tip. The proboscis usually performs respiratory, olfactory, and tactile functions. Its degree of mobility and development varies in different animals. It is especially well developed in elephants, where it is formed by the concrescence of the elongated nose and the upper lip. The tip of the elephant’s proboscis, or trunk, is equipped with a movable fingerlike projection, which enables the animal to pick up even very small objects from the ground. The trunk serves to grasp food and to touch and hold objects. Water is sucked up into the trunk and then discharged into the mouth.

In certain invertebrates the modified, usually retractile, anterior part of the body or an outgrowth of it is also called a proboscis.

proboscis

[prə′bäs·kəs]
(invertebrate zoology)
A tubular organ of varying form and function on a large number of invertebrates, such as insects, annelids, and tapeworms.
(vertebrate zoology)
The flexible, elongated snout of certain mammals.
References in periodicals archive ?
draconis complex are adapted to the local pollinator fauna, is to determine whether there is a positive relationship between the mean pollinator proboscis length and mean orchid spur length at each site.
flavifrons, the bee with the shorter proboscis, which supports the hypothesis that a longer proboscis reduces handling time of flowers with longer nectar spurs.
They insert and used proboscis up and down and sucked the sap seeds from inside the cotton boll.
Previous developmental studies on buccinoidean gastropods in the genus Nassarius revealed how the buccal mass becomes placed at the apex of the proboscis during metamorphosis from the planktotrophic larval stage.
If not, the snail applies the tip of its proboscis to individual tube feet, causing them to detach.
The walk for the reader through the park via wildlife starts with the primates and the iconic proboscis monkey.
it must be one of the world's most talked-about proboscis - and the most universally accepted; thank heavens the young Barbra was never so impressionable she bowed to pressure and had it tapered into starlet textbook perfection.
Raimi directs with brio and an impish grin, including a scene with a housefly settling on the camera lens, forcing a close-up of the insect casually cleaning its proboscis.
The film re-imagines the Apollo 11 space flight through the eyes of three young insects with a proboscis for trouble.
THIS film reimagines one of the proudest moments in modern American history - the Apollo 11 space flight - through the eyes of three young houseflies with a proboscis for trouble.