Examination of extensive Dermacentor Koch, 1844 holdings stored in several major tick collections allowed us to re-evaluate the taxonomic content of Dermacentor everestianus Hirst, 1926 and redescribe all of its parasitic stages in detail for the first time. Examination of the type specimens of Dermacentor abaensis Teng, 1963 , a species treated as valid by most workers, and Dermacentor birulai Olenev, 1927 , a species some recent authors considered as valid, led us to the conclusion that they are junior synonyms of D. everestianus. The relation of D. everestianus with some other species in the genus is questionable and warrants further studies. From possibly sympatric Dermacentor species, the adults of D. everestianus can be distinguished by the following combination of characters: intensive ivory colored ornamentation of conscutum and scutum, absence of brown patches on lateral fields of conscutum in the male, long and narrow dorsal prolongation of spiracular plates, short cornua, short dorsal spur on trochanter I, and absence of large ventral spur on distal ends of genua and tibiae II-IV. Nymphs of D. everestianus can be distinguished by numerous setae on alloscutum (>48 pairs), large spiracular plates with their longitudinal diameter exceeding that of sclerotized ring around anal valves, moderate lateral projections of basis capituli with blunt apices situated slightly posterior to the midlength of basis capituli dorsally, relatively large auriculae, relatively short, narrowly rounded at apices spurs on coxae I with internal spur being shorter than external and moderate triangular spur on coxae IV; while larvae can surprisingly easily be distinguished from those of other species found in the region by greatly elongated posterior portion of scutum where eyes are situated just posterior to the midlength of scutum. So far, D. everestianus is found only in China and Nepal, where the adults were collected from domestic and wild ungulates while the immature stages were recorded from lagomorphs and rodents.
A new tick species belonging to the genus Dermacentor Koch, 1844, namely, Dermacentor limbooliati n. sp., is described. Adults of this species are similar to those of Dermacentor auratus Supino, 1897 and Dermacentor compactus Neumann, 1901, with which it was previously confused. Males of D. limbooliati may be distinguished from those of D. auratus and D. compactus by the following suite of characters: relatively broad conscutum with slightly straightened lateral sides, conscutum widest approximately at mid-length, oval shape of pseudoscutum, central brown patch in the center of pseudoscutum broad and diffused and not continuous with central patch in posteromedian area, conscutum posterior to pseudoscutum rugose, wide and blunt internal spur on coxa I, relatively long, narrow, and pointed external spur on coxa I, numerous internal spurs on coxa IV and trochanter I with moderate and broadly triangular spur with tapering apex. Females of D. limbooliati may be distinguished from those of D. auratus and D. compactus by the following suite of characters: rounded shape of scutum, central brown patch broad and diffused in the center of scutum, relatively long alloscutum setae, genital aperture moderately narrow V-shaped with preatrial fold bulging, wide and blunt internal spur on coxa I, relatively long, narrow, and pointed external spur on coxae I and trochanter I with moderate and broadly triangular spur with tapering apex. D. limbooliati is known from Malaysia and Vietnam where the adults were collected from vegetation, Sus scrofa resting beds, a human, and clothing. The immature stages remain unknown.
A new tick species belonging to the genus Dermacentor Koch, 1844, namely, Dermacentor filippovae n. sp., is described. All stages of this species are similar to those of D. auratus Supino, 1897, D. compactus Neumann, 1901, and D. limbooliati Apanaskevich and Apanaskevich, 2015 with which it was previously confused. Males of D. filippovae may be distinguished from those of D. auratus, D. compactus, and D. limbooliati by the following suite of characters: conscutum broadly oval with convex lateral sides, widest posteriorly; trapezium-like shape of pseudoscutum; central brown patch on conscutum indistinct; coxa I with internal spur narrowly triangular with tapering apex and external spur fairly long, narrowly triangular with tapering apex; numerous internal spurs on coxa IV; and trochanter I with moderate, broadly triangular spur with tapering apex. Females of D. filippovae may be distinguished from those of D. auratus, D. compactus, and D. limbooliati by the following suite of characters: central patch of scutum narrow, distinct line interrupted around midlength; more rounded shape of scutum; long and distinct alloscutal setae; moderately broad U-shaped genital aperture with preatrial fold bulging anteriorly and thereafter sharply sloping to flat surface posteriorly; coxa I with internal spur narrowly triangular with tapering apex and external spur fairly long, narrowly triangular with tapering apex; and trochanter I with moderate, broadly triangular spur with tapering apex. Dermacentor filippovae is known from Thailand and Vietnam where the adults were collected from wild boar, Sus scrofa L., and vegetation.
Dermacentor tamokensis n. sp. and Dermacentor pseudocompactus n. sp. (Acari: Ixodidae) are described based on adults ex wild boar and vegetation from China, India, Malaysia, and Vietnam and males ex wild boar from Nepal, respectively. Adults of D. tamokensis n. sp. are similar to those of D. taiwanensis Sugimoto, 1935 and D. atrosignatus Neumann, 1906 but can be distinguished by the colour pattern of the conscutum and scutum, the size and density of punctations on the pseudoscutum and scutum, the width of the cornua, and the shape of female genital structures. Males of D. pseudocompactus n. sp. are most similar to those of D. compactus Neumann, 1901 but can be distinguished by the colour pattern, sculpture and punctations of the conscutum, and the shape and length of the coxal spurs.
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