The phylogenetic position of the Loimoidae Price, 1936 (Monogenoidea: Monocotylidea) based on analyses of partial rDNA sequences and morphological data |
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| Institution: | 1. Laboratory of Molecular Ecology and Evolutionary Parasitology, Departamento de Zoologia, Universidade Federal do Paraná, PR 81531–980, Brazil;2. Health Education Program, School of Health Professions, Campus Box 8090, Idaho State University, Pocatello, ID 83209, USA;3. Universidade Federal do Pará, Campus Universitário de Bragança, Instituto de Estudos Costeiros; Alameda Leandro Ribeiro s/n., 68600–000 Bragança, PA, Brazil;1. Institute of Parasitology, Department of Pathobiology, University of Veterinary Medicine Vienna, Vienna, Austria;4. Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, Australia;1. Laboratory of Helminthology, Institute of Veterinary Medicine, Zaisan, Ulaanbaatar, Mongolia;2. Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan;3. Laboratory of Protozoology, Institute of Veterinary Medicine, Zaisan, Ulaanbaatar, Mongolia;4. Department of Medical Biology and Histology, School of Biomedicine, Health Science University of Mongolia, Ulaanbaatar, Mongolia;5. Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, TX, USA;1. Internal Medicine Department, Groupement Hospitalier Sud, Hospices Civils de Lyon, France;2. Thoracic Surgery Department, Groupement Hospitalier Sud, Hospices Civils de Lyon, France;3. Visceral Surgery Department, Groupement Hospitalier Sud, Hospices Civils de Lyon, France;4. Laboratory of Parasitology, Groupement Hospitalier Nord, Hospices Civils de Lyon, France;5. Université Claude Bernard, Lyon 1, France |
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| Abstract: | Phylogenetic analyses of partial sequences of 18S and 28S rDNA of some monogenoids, including monocotylids and a specimen of Loimosina sp. collected from a hammerhead shark off Brazil, indicated that the Loimoidae (as represented by the specimen of Loimosina sp.) represents an in-group taxon of the Monocotylidae. In all analyses, the Loimoidae fell within a major monocotylid clade including species of the Heterocotylinae, Decacotylinae, and Monocotylinae. The Loimoidae formed a terminal clade with two heterocotyline species, Troglocephalus rhinobatidis and Neoheterocotyle rhinobatis, for which it represented the sister taxon. The following morphological characters supported the clade comprising the Loimoidae, Heterocotylinae, Decacotylinae and Monocotylinae: single vagina present, presence of a narrow deep anchor root, and presence of a marginal haptoral membrane. The presence of cephalic pits was identified as a putative synapomorphy for the clade (Loimoidae (T. rhinobatidis, N. rhinobatis)). Although rDNA sequence data support the rejection of the Loimoidae and incorporating its species into the Monocotylidae, this action was not recommended pending a full phylogenetic analysis of morphological data. |
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