Long term persistence of introduced Amblyomma geoemydae tick population under indoor conditions in Austria

First zootiological survey of Amblyomma geoemydae ticks (Acari: Ixodidae) infesting a wild turtle (Cuora flavomarginata) in northern Taiwan

The prevalence of Amblyomma geoemydae infesting yellow-margined box turtle (Cuora flavomarginata) was determined for the first time in northern Taiwan. In total, 352 ticks (140 adults, 61 nymphs and 151 larvae) were collected from 56 yellow-margined box turtles. The overall infestation was observed with an average density of 6.3 ticks per turtle and the highest seasonal prevalence was observed on March with an average tick density of 14.3 ticks per turtle. The higher seasonal prevalence was observed on April, May, July and October with an average density of 4.8, 8.3, 5.7 and 8.5 ticks per turtle, respectively. The seasonal activity of these turtles may contribute to the variation in the number of collected ticks. The genetic identity was determined by comparing the sequences of ITS2 genes obtained from seven Taiwan species of A. geoemydae and nine other species representing eight Amblyomma species and Ixodes persulcatus as outgroup. Our results provide the first zootiological survey of A. geoemydae infesting wild turtles in northern Taiwan and highlight the importance of this tick species in the study of parasite dynamics on testudines in Taiwan. Further study focused on the seasonality pattern of turtle ticks will help reveal the ecology of this host-parasite system and its impact on animal/human health.

First Record of the Tortoise Tick, Amblyomma geoemydae (Cantor, 1847) (Acari: Ixodidae) Parasitizing a Tree Shrew, Tupaia glis (Scandentia: Tupaiidae) in West Malaysia

The tick genus Amblyomma Koch, 1844 (Acari: Ixodidae) has received little attention in Malaysia; therefore, its associated hosts and distribution records are poorly known. In this study, we collected six Amblyomma sp. individuals (two larvae and four adults) that infested a common treeshrew, Tupaia glis (Diard, 1820) (Scandentia: Tupaiidae) caught in a recreational area in Sungai Lembing, Pahang (West Malaysia). The adult female ticks were morphologically identified according to taxonomic keys prior to molecular identification using cytochrome oxidase subunit I (COI) and 16S rDNA genes. The ticks were genetically verified as Amblyomma geoemydae (Cantor, 1847) with 98%-99% similarity to the available GenBank sequences. Neighbor-joining (NJ) trees indicated that A. geoemydae was clearly distinguished from other Amblyomma ticks and this was supported with high bootstrap values. This paper is the first to report A. geoemydae ticks infesting T. glis and provides a new tick-host record from West Malaysia. This information is significant for further investigation, specifically on this tick species as potential vector of tick-borne disease (TBD) agents.

Molecular and morphological identification of a reptile-associated tick, Amblyomma geoemydae (Acari: Ixodidae), infesting wild yellow-margined box turtles (Cuora flavomarginata) in northern Taiwan

The genetic identity and morphological features of a reptile-associated tick, Amblyomma geoemydae, were examined for the first time in Taiwan. The key morphological characters of male and female Am. geoemydae were photographed using a stereo microscope. The genetic identity was analyzed by comparing the 16S mitochondrial DNA gene sequences obtained from 11 Taiwan Am. geoemydae ticks with other Amblyomma species and three Ixodes species as outgroups. All the Taiwan specimens were genetically affiliated to a monophyletic group of Am. geoemydae and could be discriminated from other Amblyomma species. Our results provide the first distinguished colour figures and first genetic identification of adult Am. geoemydae ticks infesting turtles in Taiwan. The host range and vectorial capacity of Am. geoemydae for various tick-borne pathogens need to be further clarified in Taiwan.

Detection of Novel Spotted Fever Group Rickettsiae (Rickettsiales: Rickettsiaceae) in Ticks (Acari: Ixodidae) in Southwestern China

Spotted fever group rickettsiae, mainly maintained and transmitted by ticks, are important etiological agents of (re)emerging zoonotic diseases worldwide. It is of great significance to investigate spotted fever group rickettsiae in ticks in different areas for the prevention and control of rickettsioses. In this study, a total of 305 ticks were collected from wild and domestic animals in Chongqing, Guizhou, Yunnan, and Guangxi provinces of southwestern China during 2017-2019 and examined for the presence of spotted fever group rickettsiae by PCR with primers targeting the partial gltA, ompA, rrs, and htrA genes. Results showed that two spotted fever group rickettsiae species, including the pathogenic Candidatus Rickettsia jingxinensis (Rickettsiales: Rickettsiaceae) and a potential novel species Rickettsia sp. sw (Rickettsiales: Rickettsiaceae), were identified. The Ca. R. jingxinensis sequences were recovered from Rhipicephalus microplus (Ixodida: Ixodidae) and Haemaphysalis longicornis (Ixodida: Ixodidae) ticks and phylogenetically clustered with previous Ca. R. jingxinensis, Ca. R. longicornii (Rickettsiales: Rickettsiaceae), and Rickettsia sp. XY118 (Rickettsiales: Rickettsiaceae) strains. Rickettsia sp. sw was detected in Amblyomma geoemydae (Ixodida: Ixodidae) and Rh. microplus. Interestingly, as far as we know, this was the first report of Rickettsia (Rickettsiales: Rickettsiaceae) in A. geoemydae. Phylogenetic analyses indicated that this potential novel species was closely related to R. aeschlimannii (Rickettsiales: Rickettsiaceae) with gltA and ompA genes and grouped in a cluster composed of R. montanensis (Rickettsiales: Rickettsiaceae), R. raoultii (Rickettsiales: Rickettsiaceae), R. aeschlimannii, R. massiliae (Rickettsiales: Rickettsiaceae), and R. rhipicephali (Rickettsiales: Rickettsiaceae) with htrA, while formed a separate clade with rrs. The pathogenicity of Rickettsia sp. sw should be further confirmed. These results expand the knowledge of the geographical distribution and vector distribution of spotted fever group rickettsiae in China and are useful for assessing the potential public health risk.

The complete mitochondrial genome of Amblyomma geoemydae (Ixodida: Ixodidae)

The complete mitochondrial genome of Amblyomma geoemydae is reported for the first time in this study. Its entire mitogenome is 14,780 bp in length, contained 13 protein-coding genes, two ribosomal RNA genes, 22 transfer RNA genes, and two non-coding regions. The phylogenetic analysis by Maximum-likelihood method show that A. geoemydae and the others of genus Amblyomma are in the same clade, indicating that A. geoemydae belongs to the genus Amblyomma.