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Sucking for specie

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Acanthobdellidea Euhirudinea but see below. Leeches are segmented parasitic or predatory worms [1] [2] that belong to the phylum Annelida and comprise the subclass Hirudinea. They are closely related to the oligochaeteswhich include the earthwormsand like them have soft, muscular, segmented bodies that can lengthen and contract. Both groups are hermaphrodites and have a clitellumbut leeches typically differ from the oligochaetes Sucking for specie having suckers at both ends and in having external annulations that do not correspond with their internal segmentation.

The body is relatively solid, and the spacious body cavity found in other annelids, the coelomis reduced to small channels. The majority of leeches live in freshwater environments, while some species can be found in terrestrial and marine environments.

The best-known, such as the medicinal leech, Hirudo medicinalisare hematophagousattaching themselves Sucking for specie a host with a sucker and feeding on blood, having first secreted the peptide hirudin to prevent the blood from clotting.

A minority of leech species are predatory, mostly preying on small invertebrates.

Leeches are segmented parasitic or...

In aquatic species, the eggs are enclosed in a cocoon which is usually attached to something solid, but terrestrial species often conceal the cocoon under a log or in a crevice. Almost species of leech Sucking for specie currently recognised, of which some are marine, 90 terrestrial and the remainder freshwater. Leeches were used in medicine from ancient times until the 19th century to draw blood from patients.

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In modern times, Sucking for specie find medical use in treatment of joint diseases such as epicondylitis and osteoarthritis, extremity vein diseases, and microsurgerywhile hirudin is a valuable drug for some blood-clotting disorders. Some species of leech have been described, of which some are marine, 90 terrestrial and the remainder freshwater.

Sucking lice have around species...

The more primitive Acanthobdellidea are often included with the leeches, but some authors treat them as a separate clitellate group. True leeches of the infraclass Euhirudinea have both anterior and posterior suckers. They are divided into two groups: The phylogenetic tree of the leeches and their annelid relatives is based on molecular analysis of mitochondrial cytochrome c oxidase.

Both the former classes " Polychaeta " bristly marine worms and " Oligochaeta " Sucking for specie the earthworms are paraphyletic. The most ancient Sucking for specie group is the free-living polychaetes that evolved in the Cambrian period, being plentiful in the Burgess Shale about million years ago. Oligochaetes evolved from polychaetes and the leeches branched off from the oligochaetes.

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Both the oligochaetes and the leeches, having no hard parts, do not fossilise well. Leeches show a remarkable similarity to each other in morphology, very different from typical Sucking for specie which are basically cylindrical, with a fluid-filled space, the coelom body cavity. In leeches, the coelom is reduced to four slender longitudinal channels, and the interior of the body is filled with a solid dermis in between the various organs.

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