Publication Date:
2024-03-14
Description:
Two new species of the genus Dugesia from Southern China are described by applying an integrative approach, including
\nmorphological, karyological, histological, and molecular information. In the molecular phylogenetic tree, the two new species,
\nDugesia pendula Chen & Dong, sp. nov. and Dugesia musculosa Chen & Dong, sp. nov., fall into an Eastern Palearctic/Oriental
\nclade and an Oriental/Australasian clade, respectively, while sharing only a rather distant relationship. The separate specific
\nstatus of the two new species is supported also by their genetic distances. Dugesia pendula is characterized by the following
\nfeatures: symmetrical openings of the oviducts into the bursal canal, a duct between seminal vesicle and diaphragm, small
\ndiaphragm, dorsally located seminal vesicle, a penis papilla suspended from the dorsal wall of the male atrium, and mixoploid
\nkaryotype with diploid complements of 2n = 2x = 14 + 0 \xe2\x88\x92 1 B-chromosome and triploid complements of 2n = 3x = 21 + 0 \xe2\x88\x92 1
\nB-chromosome, with all chromosomes being metacentric. Dugesia musculosa is characterized by the following features:
\nasymmetrical openings of the oviducts into the bursal canal; a ventrally displaced ejaculatory duct with a terminal opening;
\ntwo diaphragms; a bursal canal provided with a strong, thick layer of circular muscle, which extends from the copulatory bursa
\nto the common atrium and gonoduct; the left vas deferens opening at the midlateral wall of the seminal vesicle, while the right
\nsperm duct opens at the dorsolateral wall of the seminal vesicle; and karyotype consisting of complicated diploid and
\naneuploid mosaicism, with diploid complements of 2n = 2x = 16 and 2n = 2x = 16 \xe2\x88\x92 17th-18th, with all chromosomes being
\nmetacentric. The uncommon karyotypes, combined with the asexual reproduction of aneuploid animals, are evaluated in the
\ncontext of the relationship between ploidy levels and reproductive modalities in the genus Dugesia.
Repository Name:
National Museum of Natural History, Netherlands
Type:
info:eu-repo/semantics/article
Format:
application/pdf
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