Endoparasites (helminths and coccidians) in the hedgehogsAtelerix algirusandParaechinus aethiopicusfrom Algeria

The discovery of Moniliformis saudi (Acanthocephala: Moniliformidae) in the Algerian hedgehog Atelerix algirus in Malta: morphological, molecular, and metal analyses

The acanthocephalan Moniliformis saudi Amin, Heckmann, Mohammed, Evans, 2016 was originally described from the desert hedgehog, Paraechinus aethiopicus (Ehrenberg) in central Saudi Arabia. The distribution of P. aethiopicus extends to North Africa and west to Mauritania. Moniliformis saudi was recently found in the Algerian hedgehog Atelerix algirus (Lereboullet) in Malta. The distribution of A. algirus is restricted to the North African and east Iberian Mediterranean coast and associated islands. Both host species cohabit and share the same feeding grounds in northern Algeria where common infections appear to take place. The morphology of specimens from both acanthocephalan populations was similar, with minor variations mostly related to the relatively larger Maltese specimens especially the trunk and the male reproductive system. Taxonomic features like the cone-shaped anterior trunk, size and formula of proboscis and hooks, the receptacle, size and shape of eggs, anatomy of the apical proboscis sensory pores, and the stellate body wall giant nuclei were, however, practically identical. SEM and microscope images of specimens of the Maltese population emphasize their qualitative characteristics such as the degree of the extreme spiral muscle development and the development of the posterior nucleated pouches of the proboscis receptacle. Proboscis hooks of specimens from both the Maltese and the Saudi populations had similarly high levels (percent weights) of calcium, moderate levels of phosphorus, and minimal levels of sulfur, magnesium and sodium marking the diagnostic value of the Energy Dispersive x-ray analysis in species recognition. Newly generated partial sequences of the 18S ribosomal RNA and cytochrome C oxidase subunit 1 (Cox1) of the mitochondrial gene were generated from M. saudi from Malta. Moniliformis saudi from Malta, when compared with other available sequences of the same species isolates available in the GenBank database, formed a strongly supported clade with other congeners. The comparison of the molecular profiles of specimens from populations in Malta, Spain, and Saudi Arabia shows no or low genetic variation between them. Ultimately, we provide a morphological and molecular description of a new population of M. saudi from a new host species in a new geographical location, vastly exceeding the originally described ones from Saudi Arabia. A Cox 1 haplotype network inferred with 10 sequences revealed the presence of eight haplotypes, one of which was shared between the populations of Malta and Spain of M. saudi.

Morphological and molecular characterization of Cystoisospora yuensis n. sp. and Cystoisospora rastegaievae (Protozoa: Eimeriidae) in amur hedgehogs, Erinaceus amurensis (Schrenk, 1859)

Twenty-four fecal samples were collected from captive amur hedgehogs (Erinaceus amurensis) in Zhengzhou, China. Based on morphological and molecular analysis, the overall prevalence of Cystoisospora was 62.5% (15/24). These samples contained two types of coccidian oocysts, including C. rastegaievae (50.0%, 12/24) and a new species named C. yuensis n. sp. (12.5%, 3/24). Sporulated oocysts (n = 30) of C. yuensis n. sp. are ovoid, (20.6 ± 1.4) μm × (20.9 ± 0.9) μm, with a shape index (length/width) of 1.0 and a smooth and bi-layered oocyst wall, 1.3 μm thick (outer layer 0.8 μm, inner 0.5 μm). A polar granule is present, but micropyle cap, micropyle, and oocyst residuum are absent. The sporocysts are ovoid-shaped, (9.3 ± 0.6) μm × (8.5 ± 1.1) μm, with a shape index (length/width) of 1.1. Stieda, substieda bodies, and refractile bodies are absent. Residuum is scattered and distributed around the entire sporocysts. At the 18S rRNA locus, C. yuensis n. sp. exhibited the highest identity to C. timoni (99.3%) from a slender-tailed meerkat. It has 98.0% identity at the 28S rRNA locus and 99.3% at the ITS locus. Based on morphological and molecular data, this isolate is a new species of Cystoisospora. Additionally, we have provided data on the prevalence of C. rastegaievae in China and sequences of the 18S rRNS, 28S rRNA, and ITS loci.

Combined morphology and DNA-barcoding to identify Plagiorhynchus cylindraceus cystacanths in Atelerix algirus

The acanthocephalan parasite Plagiorhynchus cylindraceus has a global distribution and utilizes isopods and birds as intermediate and definitive hosts, respectively. Occasionally, mammals of various orders can act as paratenic hosts. In hedgehogs, severe cases have been reported in juvenile specimens due to secondary infections, as a consequence of complete penetrations of the intestinal wall by cystacanths. In a 66-month study period, we found seven larvae of this parasite encysted in both, the peritoneal cavity and intestine of the Algerian hedgehog, Atelerix algirus in Majorca. Morphology alone was insufficient to identify the species, due to the lack of previous reports and taxonomy-informative characters. In the present report, we combined the use of morphology and the DNA-barcoding approach to confirm to identify cystacanths as P. cylindraceus. This is the first report of this parasite in this hedgehog species. The epidemiological implications will be discussed, including the risk of zoonosis and the importance of using modern approaches to identify immature acanthocephalan larvae in wildlife hosts.

Molecular data confirm the taxonomic position of Hymenolepis erinacei (Cyclophyllidea: Hymenolepididae) and host switching, with notes on cestodes of Palaearctic hedgehogs (Erinaceidae)

The cestode Hymenolepis erinacei is regarded as a widely distributed parasite in European hedgehogs of the genus Erinaceus, although the taxonomic position of this hymenolepidid has been debated for a considerable period of time. We present the first molecular data for this cestode, including partial DNA sequences of mitochondrial 16S and nuclear 28S ribosomal genes. Molecular phylogenetic analysis clusters H. erinacei in one clade together with representatives of the genus Hymenolepis from rodents. Characteristic morphological features, including the oval embryophore without filaments and shape of the embryonic hooks of H. erinacei are described. Features of these cestode eggs are proposed as a basis for non-invasive detection of parasitic infections in small mammal populations. The present study explores phylogenetic relationships within the genus Hymenolepis and the host switching related to H. erinacei. Cases of host switching in other genera of the family Hymenolepididae are reviewed. A short critical review of cestodes parasitizing hedgehogs in the Palaearctic is presented.