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Phylogenetic Analyses Reveal That Schellackia Parasites (Apicomplexa) Detected in American Lizards Are Closely Related to the Ge

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Phylogenetic Analyses Reveal That Schellackia Parasites (Apicomplexa) Detected in American Lizards Are Closely Related to the Ge Megía-Palma et al. Parasites & Vectors (2017) 10:470 DOI 10.1186/s13071-017-2405-0 RESEARCH Open Access Phylogenetic analyses reveal that Schellackia parasites (Apicomplexa) detected in American lizards are closely related to the genus Lankesterella: is the range of Schellackia restricted to the Old World? Rodrigo Megía-Palma1, Javier Martínez2, Dhanashree Paranjpe3,4, Verónica D’Amico5, Rocío Aguilar6,7, María Gabriela Palacios5, Robert Cooper3, Francisco Ferri-Yáñez8, Barry Sinervo3 and Santiago Merino1* Abstract Background: Species of Schellackia Reichenow, 1919 have been described from the blood of reptiles distributed worldwide. Recently, Schellackia spp. detected in European and Asian lizards have been molecularly characterised. However, parasites detected in American lizard hosts remain uncharacterised. Thus, phylogenetic affinities between the Old and New World parasite species are unknown. Methods: In the present study, we characterised morphologically and molecularly the hemococcidian parasites (sporozoites) that infect three lizard hosts from North America and two from South America. Results: In total, we generated 12 new 18S rRNA gene sequences of hemococcidian parasites infecting New World lizard hosts. By the microscopic examination of the smears we identified Schellackia golvani Rogier & Landau, 1975 (ex Anolis carolinensis Voigt) and Schellackia occidentalis Bonorris & Ball, 1955 (ex Uta stansburiana Baird & Girard and Sceloporus occidentalis Baird & Girard) in some samples, but the phylogenetic analysis indicated that all 18S rDNA sequences are distant from Schellackia species found in Old World lizards. In fact, the hemococcidian parasites detected in the New World lizards (including S. occidentalis and S. golvani) were closely related to the genus Lankesterella Labbé, 1899. Consequently, we suggest these two species to be included within the genus Lankesterella. Conclusions: Life history traits of hemococcidian parasites such as the type of host blood cells infected, host species or number of refractile bodies are not valid diagnostic characteristics to differentiate the parasites between the genera Schellackia and Lankesterella. Indeed, lankesterellid parasites with a different number of refractile bodies had a close phylogenetic origin. Based on the phylogenetic results we provide a systematic revision of the North American hemococcidians. Our recommendation is to include the species formerly described in the genus Schellackia that infect American lizards into Lankesterella (Lankesterellidae) as Lankesterella golvani (Rogier & Landau, 1975) n. comb and L. occidentalis (Bonorris & Ball, 1955) n. comb. Keywords: Haemococcidia, Lankesterellidae, Lankesterella,Schellackiidae,Schellackia,Reptile * Correspondence: [email protected] 1Departamento de Ecología Evolutiva, Museo Nacional de Ciencias Naturales-CSIC, Madrid, Spain Full list of author information is available at the end of the article © The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Megía-Palma et al. Parasites & Vectors (2017) 10:470 Page 2 of 10 Background Landau, 1975 and S. occidentalis Bonorris & Ball, 1955). Lankesterella Labbé, 1899 [1] and Schellackia Reichenow, The other seven parasite species, S. orientalis Telford, 1919 [2] are two genera of haemococcidian parasites of in- 1993 [24], S. calotesi Finkelman & Paperna, 1998 [25], S. dependent evolutionary origin that are nested within a bolivari Reichenow, 1919 [2], S. brygooi Landau, 1973 paraphyletic Eimeriidae [3]. The evolutionary novelty in [6], S. ptyodactyli Paperna & Finkelman, 1996 [13], S. the life-cycle of parasites in these genera is the participa- agamae Bristovetzky & Paperna, 1990 [26] and S. boca- tion of a blood-sucking vector that exerts a mechanical gei Álvarez-Calvo, 1975 [27] were detected in Old World role in the transmission between hosts. Therefore, the in- lizards [4]. The sporozoites show one refractile body fective stages of the protozoans remain dormant in the (RB) in S. bolivari, S. bocagei, S. orientalis, S. brygooi, S. transmitter without undergoing any development or golvani and S. legeri (syn. Lainsonia legeri) [3, 4], modification [4]. Thus, at least in lizard hosts, transmis- whereas S. calotesi, S. ptyodactyli, S. agamae, S. occiden- sion is accomplished by predation on the infected inverte- talis, S. landaue and S. iguanae (syn. Lainsonia iguanae) brate (but see [5]). Some authors consider Lainsonia show a variable number of RB (between zero and two Landau, 1973 [6] as a third genus of hemococcidia that [4]). All these species were described infecting mainly undergoes sporogony within reticuloendothelial host cells erythrocytes, but also can infect lymphocytes and mono- of the liver, spleen, lungs, kidney, and capillaries of the cytes [4]. The exception is S. golvani that characteristic- brain [4] in South American lizard host species [4, 7]. ally infects polymorphonuclear leukocytes [4, 10]. On However, other authors prefer to consider Lainsonia as a the other hand, information on the Lankesterella para- synonym of Schellackia based on the common character- sites that infect reptiles is scarce. Only two species of istic of their life-cycles, i.e. the presence of eight sporozo- Lankesterella, L. millani Álvarez-Calvo, 1975 [27] and L. ites in the oocyst [4, 8]. baznosanui Chiriac & Steopoe, 1977 [28], were described The genus Schellackia was originally described in infecting lizard hosts in the world. However, according European lizard hosts [2]. So far, species of Schellackia to Telford [4] these two taxa were not further consid- have been described infecting frog and lizard hosts from ered as valid species because they were originally de- Europe, America, Asia and Africa [9–14]. Schellackia sp. scribed based on insufficient morphological data. was reported to infect the scincid lizard Egernia stokesii No information on the molecular diversity and the in Australia [15] but the identification of these parasites phylogenetic affinities of the hemococcidia that infect remains to be molecularly confirmed. The second hemo- New World lizard hosts is available. Therefore, we have coccidian genus, Lankesterella, was erected for a species sampled different populations of New World lizards be- infecting frogs [1]. Later, species of this genus were de- longing to the families Phrynosomatidae (genera Uta scribed infecting birds and lizards [3, 16–23]. The main Baird & Girard and Sceloporus Wiegmann), Iguanidae morphological difference used to classify the hemococci- (genus Dipsosaurus Hallowell), and Liolaemidae (genera dia into Lankesterella or Schellackia has been the char- Liolaemus Wiegmann and Phymaturus Gravenhorst) to acteristics of the oocyst during the endogenous obtain molecular data that allowed the study of the evolu- development of the parasite. The presence of oocysts, tionary affinities between hemococcidia detected in Old- normally in the lamina propia of the intestine, with and New World host lizards. In addition, we present mor- eight naked sporozoites surrounded by a soft-walled oo- phological data on the sporozoites found infecting the cyst, has been considered a diagnostic character for the blood of the American lizard hosts studied here. genus Schellackia. In contrast, the presence of 32 or more sporozoites is the diagnostic characteristic for the Methods genus Lankesterella [4]. However, the latter was true for Sampling methods Lankesterella spp. described in anuran hosts [8, 18, 21], We gathered several blood samples with hemococcidian since no endogenous development of Lankesterella spp. parasites that were collected in different localities in infecting lizard hosts has been described so far. The api- North and South America. From California, blood was complexan genera Lankesterella and Schellackia were obtained from six infected Uta stansburiana hesperis largely believed to form a monophyletic clade within the Richardson (Phrynosomatidae) from Corn Springs (South family Lankesterellidae [4, 8]. However, phylogenetic California) and 12 from Los Baños (West California), 19 analyses revealed they have an independent evolutionary Sceloporus occidentalis bocourtii Boulenger (Phrynosoma- origin [3]. tidae) from Santa Cruz (West California), two S. occiden- In lizards, there are 12 species of the genus Schellackia talis biseriatus Hallowell from high elevation (1800 masl) described worldwide [4]. Five of these were described from the Sierra Nevada mountains (CA, USA) and one from lizards in the Americas. Among these American Dipsosaurus dorsalis Baird & Girard (Iguanidae) from species, three occur in Brazil (i.e. Lainsonia spp.) and Boyd Canyon, Riverside County (South California). One two occur in North America (S. golvani Rogier & infected sample of Liolaemus pictus Müller & Hellmich Megía-Palma et al. Parasites & Vectors (2017) 10:470 Page 3 of 10 (Liolaemidae) from Huinay (Chile) was also included in Megía-Palma et al. [14]. The DNA was then purified the study. All authors captured the
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