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Several sensory nerves connect directly to the cerebral ganglion; there are sensory and motor nerve cells connected to the ventral nerve cord ganglia in each segment. [25] Leeches have between two and ten pigment spot ocelli, arranged in pairs towards the front of the body. There are also sensory papillae arranged in a lateral row in one ...
Hirudo orientalis is a species of medicinal leech.It has been confused with Hirudo medicinalis, but has recently been recognized as a different species. [1] [2] This Asian species is associated with mountainous areas in the subboreal eremial zone and occurs in Azerbaijan, Iran, Uzbekistan and Kazakhstan.
Sensory papillae covering the exterior of a velvet worm. Papillae (sg.: papilla) are small, protruding structures found on the surface of certain worms, specifically polychaetes and onychophorans. [1] In polychaetes, these papillae are tiny, fleshy projections on the worm's body or parapodia, often associated with sensory and locomotive ...
Acetabulum of leech towards the right. In leeches, acetabulum refers to the prominent posterior sucker at the extreme end of the body. In fact it forms a head-like structure, while the actual head is relatively small. It is a thick disc-shaped muscular system composed of circular, longitudinal and radial fibers. [4]
Other invertebrates have similar sensory organs also referred to as sensilla; these consist of various papillae or ciliated areas of the cuticle connected to sensory neurons and occur in velvet worms, tardigrades and leeches. [3]
Macrobdella decora, also known as the North American medicinal leech, is a species of freshwater leech found in much of eastern North America in freshwater habitats, although there is one disjunct population in northern Mexico. M. decora is a parasite of vertebrates, including humans, and an aquatic predator of eggs, larvae, and other ...
The digging sea robins had shovel-shaped legs that were covered in protrusions called papillae, which are similar to the taste buds on our tongues. Meanwhile, the non-digging sea robins had rod ...
Spread through the center of each annulus, these sensory buds have a round, raised appearance on the dorsum of this species. These sensory buds are composed of bipolar sensory cells, which are chemoreceptive and perceive water movement. [17] This leech does also have a brain that is a mass of ganglia. [8]