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Platyhelminthes (from the Greek πλατύ, platy, meaning "flat" and ἕλμινς (root: ... In all species the adults have complex reproductive systems, capable of ...
The Turbellaria are one of the traditional sub-divisions of the phylum Platyhelminthes (flatworms), and include all the sub-groups that are not exclusively parasitic.There are about 4,500 species, which range from 1 mm (0.039 in) to large freshwater forms more than 500 mm (20 in) long [3] or terrestrial species like Bipalium kewense which can reach 600 mm (24 in) in length.
Planarian reproductive system. Triclads reproduce sexually and asexually, and different species may be able to reproduce by one or both modes. [5] Planarians are hermaphrodites. In sexual reproduction, the mating generally involves mutual insemination. Thus, one of their gametes will combine with the gamete of another planarian.
Many flatworms are considered invasive pests, since they eat native earthworms, snails and other soil organisms. And like other worms, they can reproduce asexually − even being split in half − ...
Pseudoceros are simultaneous hermaphrodites [9] and reproduce sexually via random hypodermic insemination through the body tissue. [10] These organisms participate in penis fencing, [9] which is a behavior where the flatworms use their extended penises to stab and inseminate the other, while avoiding becoming inseminated themselves.
Monogenea are Platyhelminthes, so are among the lowest invertebrates to possess three embryonic germ layers—endoderm, mesoderm, and ectoderm. In addition, they have a head region that contains concentrated sense organs and nervous tissue (brain). Like all ectoparasites, monogeneans have well-developed attachment structures.
Internal anatomy of Dendritobilharzia pulverulenta.The Mehlis' gland is labelled m. (scale bars: A, D, E = 1 mm; B = 500 μm; C, F = 100 μm). Mehlis gland ('mā-lis-) also called Shell gland, is primarily present surrounding the ootype of Platyhelminthes, and it is a part of the female reproductive organ of Platyhelminthes.
The reproductive system includes one or more testes, cirri, vas deferens, and seminal vesicles as male organs, and a single lobed or unlobed ovary with the connecting oviduct and uterus as female organs. The common external opening for both male and female reproductive systems is known as the genital pore, which is situated at the surface ...