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Invertebrates also have a pharynx. Invertebrates with a pharynx include the tardigrades, [12] annelids and arthropods, [13] and the priapulids (which have an eversible pharynx). [14] The "pharynx" of the nematode worm is a muscular food pump in the head, triangular in cross-section, that grinds food and transports it directly to the intestines ...
In general, however, they possess a pair of jaws and a pharynx that can be rapidly everted, allowing the worms to grab food and pull it into their mouths. In some species, the pharynx is modified into a lengthy proboscis. The digestive tract is a simple tube, usually with a stomach part way along.
Members of the Phyllodocidae are characterised by an eversible pharynx and leaf-like dorsal cirri. The head has a pair of antennae at the front, a pair of ventral palps and a single median antenna known as a "nuchal papilla". There is a pair of nuchal organs and there may or may not be a pair of eyes.
Predatory species in suborder Kalyptorhynchia often have a muscular pharynx equipped with hooks or teeth used for seizing prey. [25] Most turbellarians have pigment-cup ocelli ("little eyes"); one pair in most species, but two or even three pairs in others. A few large species have many eyes in clusters over the brain, mounted on tentacles, or ...
The digestive tract is essentially a tube running the length of the body, but has a powerful muscular pharynx immediately behind the mouth cavity. In many species, the pharynx simply helps the worm suck in food, but in many aquatic species, it can be turned inside out and placed over food like a suction cup before being pulled back in.
The trunk is the longest part of the animal. It contains the pharynx, which is perforated with gill slits (or pharyngeal slits), the oesophagus, a long intestine, and a terminal anus. It also contains the gonads. A post-anal tail is present in juvenile members of the acorn worm family Harrimaniidae. [6]
This allows for parasitic worms to attach to their host by penetrating the host’s tissue with spines lining the acetabulum organ. In trematodes, the oral sucker is linked to the pharynx via a canal composed of meridional, equatorial, and radial muscle fibers. [13] Together, the mouth, pharynx, and esophagus form the foregut in Trematodes. [14]
Eunicida is an order of polychaete worms. Characteristics ... There is a muscular pharynx with a dorsal pair of mandibles and a set of ventral, toothed, ...