. Bonner zoologische Monographien. Zoology. PANESAR, EVOLUTION IN WATER MITES • Never with true swimming setae distallv on IV-L- 5 (a row of elongated stiff, thin setae are present in this position in some species); other segments of legs with elongated thin setae in several species. • VS with extensive secondar)- sclerotization in all species, often a small furrow of soft integument is left between the postgenitale and the secondary- sclerotization posterior to the genital field. Species included Nilotonia {Mamersonid) amazonica {Vitts, 1954) was described from the Amazon river in Brazil, and
. Bonner zoologische Monographien. Zoology. PANESAR, EVOLUTION IN WATER MITES • Never with true swimming setae distallv on IV-L- 5 (a row of elongated stiff, thin setae are present in this position in some species); other segments of legs with elongated thin setae in several species. • VS with extensive secondar)- sclerotization in all species, often a small furrow of soft integument is left between the postgenitale and the secondary- sclerotization posterior to the genital field. Species included Nilotonia {Mamersonid) amazonica {Vitts, 1954) was described from the Amazon river in Brazil, and N. (M) simoni Orghidan & Grujia, 1983, was discovered in Venezuela. The three other species - A^. (M) hiscn- tata, N. (M.) monoscutata and N. [M.) similis- were all described from coUeaions on Trinidad (Bader 1995). Hence all five species now assigned to this subgenus are found in or around the Amazon region. Nilotonia {Mamersonid) amazonica shares with Ni- lotonia () the elongated chelicera and the chaeto- taxy of rV-L-6, including the subterminal seta on IV- L-6 being slighdy longer than the preceding setae, and the fact that exactly in the positions where the true s^vimming hairs are located in Nilotonia () species, enlarged, stiff setae are found in Nilotonia {Mamer- sonid) amazonica. However, it shares with all other species assigned to the subgenus the absence of true swimming setae, and shares with the three species from Trinidad the enlarged dorsal plates. N. {M.) simoni \s the only species in the subgenus with moderate secondary sclerotizations and is the only species in the Nilotonia-like subgenera with a clearly elongated terminal seta on IV-L-6. However, it shares with the other species of the subgenus the presence of elongated, stiff setae on segments IV-L- 3,4,5. Subgenus: Manotonia (Viets, 1935) A/ö^M Walter, 1935; Name preoccupied by Hübner, 1816 (Lepidoptera); Type Mania musicolaW^Xtti, 1935 (Mono- basic). ManotoniaYiQis, l935;Type Mania musi
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