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46 • "PROTIST—2016
correspondance analysis to identify a microhabitat preference. Except for the head, pleopods and telson, lagenophryid ciliates were attached to 2-9 amphipod body regions, and greatest prevalence was found on coxae, followed by pereiopods. For Cuitzeo Lake individuals the total L. patina loricae abundance was from 617-1165, being the coxae with the highest values (626), and for Xochimilco Lake L. patina showed a highly significative preference for coxae for their attachment (X2=1752.01, P<0.0001); we also obtained the same highly significant result for Cuitzeo Lake symbiotic system (with X2=1317.8, P < 0.0001). These results could be explained by the shape and function of appendages of amphipods, providing the water flow derived by host movements and swimming, carrying food and oxygen for symbiotic ciliate.
Acknowledgements. To Programa de Apoyo a Proyectos de Investigación e Innovación Tecnológica (PAPIIT-DGAPA-UNAM), for the funds to project IN229811 for Cuitzeo Lake samples collection. To all participants of PAPIIT IN229811 project for their support in samples collection, especially to Biól. M. Reyes and M. C. Maricela Vicencio, Facultad de Ciencias, UNAM, for technical procedures.
COMPARATIVE MORPHOMETRY OF LEIDY-ANA SP. (EUGREGARINORIDA) AND ITS FIRST RECORD IN CONOCEPHALUS ICTUS (ORTHOPTERA: ENSIFERA: TETTIGO-NIIDAE) FROM MEXICO Medina-Durán J.H.1, Mayén-Estrada R.1, Mariño-Pérez R.2, Song H.2
1 - Laboratorio de Protozoología, Departamento de Biología Comparada, Facultad de Ciencias, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, Av. Universidad 3000, C.P. 04510, Ciudad de México, México
2 - DepartmentofEntomology, TexasA&M University, College Station, Texas, USA jorgemedinad@ciencias.unam.mx
Leidyana is a genus of apicomplexan eugregarine inhabiting the digestive tract of insects, mainly lepidopterans and orthopterans. Its classification is mainly based on the shape of their epimerite, protomerite, deuteromerite and oocyst, and also on their gametocyst dehiscence. Nevertheless, morphometrical data of the species belonging to this genus have been also considered in order to establish reliable descriptions but is not a main criterion for its identification. In the present work we compared the morphometric attributes of Leidyana sp. a parasite of Conocephalus ictus collected in Tlanchinol, Hidalgo, Mexico, with
two species that also infect orthopterans belonging to the same suborder (Ensifera) but different families and infraorder (Gryllidea) and belonging to the Old World. These species of Leidyana also possess epimerites resembling the ones found of Leidyana sp. The three species measurements comparison was made using a one-way ANOVA and a correspondence analysis (n=20 each sample). We found significative differences in the epimerite length and width, considered as an important character for the eugregarines taxonomy to genus and species level identification. Additionally we show the first record of a species of genus Leidyana parasitizing the gut lumen of an orthopteran of the infraorder Tettigoniidea, family Tettigonidae, as well for Mexico. Key words: eugregarines, Mexico, Leidyana.
Acknowledgments: To Biol. Margarita Reyes Santos for her advice in the stain techniques.
SOME NOTES ON THE MORPHOLOGY, GEOGRAPHIC DISTRIBUTION AND 18S rRNA GENE SEQUENCE OF A FRESHWATER OXY-TRICHID CILIATE (HYPOTRICHIA: OXY-TRICHIDAE) FROM MEXICO Méndez-Sánchez Daniel1, Mayén-Estrada Rosaura1, Hu Xiaozhong2, Luo Xiaotian2, Song Weibo2
1 - Laboratorio de Protozoología, Facultad de Ciencias, Universidad Nacional Autónoma de México, Av. Universidad 3000 Ciudad Universitaria, 04510 Coyoacán, Ciudad de México, México
2 - Laboratory ofProtozoology, Institute of Evolution and Marine Biodiversity, Ocean University ofChina, Qingdao 266003, China dms3v@hotmail.com
Species of genus Oxytricha are characterized by 18 frontal-ventral-transverse cirri, one right and one left row of marginal cirri, undulating membranes and dorsal kineties usually in Oxytricha-pattern, and also the presence of caudal cirri. We collected some samples from a Mexican freshwater lake and we isolated Oxytricha granulifera (Foissner & Adam, 1981). Our individuals presented six dorsal kineties compared with the Austrian population (with five dorsal kineties) collected in a terrestrial environment. All available records of O. granulifera were plotted and obtained a broad geographic distribution. Considering the 18S rRNA gene sequence, our species grouped with other O. granulifera strains and populations available in GenBank. Due to the number of dorsal kineties we propose that Mexican population could be considered like a subspecies of O. granulifera.
Acknowledgements: To Posgrado en Ciencias Biolygica UNAM and CONACyT for the grant to
