An alternative explanation (essentially a null model) for high mean base chromosome number (n = 57 for homosporous ferns compared to n = 16 for angiosperms Soltis and Soltis, 2000) and rate of polyploid speciation events in ferns is their ancient origin: Meyers and Levin (2006) invoke a ‘polyploid ratchet’ model, as polyploidy is seldom reversible. (2009) found that 15% of angiosperm speciation events and ~31% of fern and lycophyte speciation events resulted in an increase in ploidy level. Hirudo medicinalis, the leech endemic to Southeast Asia and Europe, is the most commonly used species.
LEECH SPECIES SKIN
Leeches are hermaphrodites, and unlike earthworms, it does have suckers on either end plus, the ring on their skin doesn’t correspond to the internal segments. It can grow to a length of over 50 cm (20 in). A leech is a uniquely segmented worm with a soft and muscular body that can contract and lengthen just like its close cousin, the earthworms. They’re related to earthworms, but differ from them by the presence of suckers on their bodies and because most of them live in water. Leech classification is primarily based on the presence or absence of setae (bristles) and the morphology of the mouth, proboscis (feeding organ), jaws, and suckers. Leeches are worm-like invertebrate animals that belong to the group of annelids. The Kinabalu giant red leech (Mimobdella buettikoferi) is a large bright orange-red coloured leech that is endemic to Mount Kinabalu, Borneo. Leeches are segmented worms belonging to the Phylum Annelida, Class Clitellata, Subclass Hirudinida. These predictions partly bear out in a comparison of polyploid speciation rates in angiosperms, ferns and lycophytes: Wood et al. Synonyms Mimobdella Büttikoferi Blanchard, 1897. "Theory predicts that polyploidy should appear most frequently in organisms with low dispersal, large numbers of gametes and propagules, perennial habit, and self-compatibility or the capacity for asexuality/clonality, as these characteristics should increase availability of compatible mates early in establishment (Mable, 2004 Rieseberg and Willis, 2007). Some links to resources that you may find helpful are listed below: Leeches are well known, feared, and despised throughout much of the world. There is not too much known about this species.
I believe that you are correct that Glossiphonia weberi lata is a junior synonym of Alboglossiphonia lata. Leeches are worm-like invertebrate animals that belong to the group of annelids.
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