Sergio Guillén-Hernández

Publications (6)8.27 Total impact

• Source

  Available from: Hugo Mejia

  Article: A new cucullanid from the black grouper Mycteroperca bonaci (Osteichthyes: Serranidae) off the coast of Yucatán, México.

  Hugo H Mejía-Madrid, Sergio Guillén-Hernández
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  ABSTRACT: Cucullanus mycteropercae n. sp. is described from the intestine of the black grouper, Mycteroperca bonaci Poey, from the northern coast of Yucatán, México. The new species is readily distinguishable from other Cucullanus species because it possesses an ellipsoidal papilla-like structure situated medially on the anterior cloacal lip of males. Other differentiating characters include the variable position of postcloacal pair 8 in males, the subventral position of phasmids, a slightly ventrally hooked posterior end of gubernaculum, and the presence of a large, cylindroconical sclerotized tail end in both sexes. This is the fourth record of a marine cucullanid off the Yucatán Peninsula in México belonging to Cucullanus Müller, 1777.
  Journal of Parasitology 02/2011; 97(1):122-7. · 1.40 Impact Factor
• Article: Helminth parasites in Chaunus marinus and Cranopis valliceps (Anura: Bufonidae) from Lagunas Yalahau, Yucatan, Mexico.

  Juan Francisco Espínola-Novelo, Sergio Guillén-Hernández
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  ABSTRACT: Eight helminth taxa were found parasitizing Chaunus marinus (n = 40) and Cranopsis valliceps (n = 40) from the Parque Estatal Lagunas Yalahau, Yucatan, Mexico. Seven taxa (2 digeneans: Langeronia macrocirra, Mesocoelium monas; 1 acanthocephalan: Oncicola sp.; 3 nematodes: Rhabdias füleborni, Aplectana itzocanensis, Cruzia morleyi; and a nematode larva) were found in C. marinus, while 4 taxa (all nematodes: Rhabdias fuelleborni, Aplectana itzocanensis, Ozwaldocruzia sp., and a nematode larva) were present in C. valliceps. Nematodes, particularly A. iztocanensis, showed high prevalence, mean abundance, and mean intensity values for both species of amphibians. The occurrence of R. fuelleborni, M. monas, L. macrocirra, and C. morleyi in these amphibians from the Yucatan Peninsula confirms their neotropical distribution, while the presence of A. itzocanensis increases its geographical distribution, suggesting a preference by neotropical, rather than neartic areas.
  Journal of Parasitology 07/2008; 94(3):672-4. · 1.40 Impact Factor
• Article: HELMINTH PARASITES IN CHAUNUS MARINUS AND CRONOPSIS VALLICEPS (ANURA: BUFONIDAE) FROM LAGUNAS YALAHAU, YUCATAN, MEXICO Juan Francisco Espínola-Novelo and Sergio Guillén-Hernández Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Yucatán, Carretera Mérida-Xmatkuil, Km 15.5, A. P. 4-116, Itzimná, Mérida, Yucatán, México. e-mail: ghernand@uady.mx.

  Juan Espinola-Novelo, Sergio Guillén-Hernández
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  ABSTRACT: ABSTRACT, Eight helminth taxa were found parasitizing Chaunus marinus (N = 40) and Cronopsis valliceps (N = 40) from the Parque Estatal Lagunas Yalahau, Yucatan, Mexico. Seven taxa (two digenean: Langeronia macrocirra, Mesocoelium monas; one acanthocephalan: Oncicola sp.; three nematodes: Rhabdias füleborni, Aplectana itzocanensis, Cruzia morleyi, and a nematode larvae) were found in C. marinus, while four (Rhabdias fuelleborni, Aplectana itzocanensis, Ozwaldocruzia sp., and nematode larvae) were found in C. valliceps. Nematodes, particularly A. iztocanensis showed high prevalence, mean abundance and mean intensity values for both species of amphibians. The recording of R. fuelleborni, M. monas, L. macrocirra and C. morleyi in these amphibians from the Yucatan Peninsula confirms its Neotropical distribution, while the recording of A. itzocanensis increases its geographical distribution suggesting a Neotropical rather than Neartic origin.
  Journal of Parasitology 04/2008; · 1.40 Impact Factor
• Article: A new species of Oochoristica (Eucestoda: Cyclophyllidea) parasite of Ctenosaura oaxacana (Reptilia: Iguanidae) from Mexico.

  Sergio Guillén-Hernández, Luis García-Prieto, María Antonieta Arizmendi-Espinosa
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  ABSTRACT: Oochoristica whitfieldi n. sp., parasitizing the intestine of the Oaxacan black iguana Ctenosaura oaxacana (Kohler and Hasbun, 2001), in Ruinas de Guiengola, Oaxaca state, Mexico, is described. The new species can be distinguished from all 4 congenera infecting Iguanidae in the neotropical realm in possessing a lower mean number of testes (122 in O. acapulcoensis Brooks, Pérez-Ponce de León, and García-Prieto, 1999; 62 in O. guanacastensis Brooks, Pérez-Ponce de León, and García-Prieto, 1999, and 95 in O. leonregagnonae Arizmendi-Espinosa, García-Prieto, and Guillén-Hernández, 2005, vs. 35 in O. whitfieldi), and a wider scolex (0.450-0.600, 0.475-0.537, 0.5-0.8, vs. 0.25-0.26, respectively). Oochoristica iguanae Bursey and Goldberg, 1996 differs from the new Mexican species in having a longer strobila (60-110 mm vs. 14.4-33.7 mm, respectively), fewer ovarian sublobes (6 vs. 11-17), and a cirrus pouch that hardly reaches excretory canals (whereas in O. whitfieldi the cirrus pouch widely overpasses these canals).
  Journal of Parasitology 11/2007; 93(5):1136-9. · 1.40 Impact Factor
• Article: Intraspecific variation of Haematoloechus floedae Harwood, 1932 (Digenea: Plagiorchiidae), from Rana spp. in North and Central America.

  Virginia León-Régagnon, Sergio Guillén-Hernández, María Antonieta Arizmendi-Espinosa
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  ABSTRACT: Haematoloechus floedae was originally described from the lungs of Rana catesbeiana in Texas, and later reported in Florida, in the United States. It was proposed to be synonymous with H. breviplexus, H. parviplexus, and H. varioplexus. We obtained specimens of H. floedae from Rana brownorum and R. vaillanti in Yucatán, Mexico; R. cf. forreri and R. taylori in Guanacaste, Costa Rica; and R. catesbeiana in Georgia and California. Some specimens were processed for morphological study; sequences of the 28S of the rDNA and the mitochondrial COI were obtained from several specimens of each population. Phylogenetic analysis of molecular data indicates studied populations constitute a single taxon, different from H. varioplexus, H. breviplexus, and H. parviplexus. Some morphological characters remain constant among populations of H. floedae, and are useful for differentiating this species. These include the oral sucker-pharynx ratio, oral sucker-ventral sucker ratio, ovary and testes shape, extension of uterine longitudinal loops, and extension of vitelline follicles (in fully developed worms). Sequence homogeneity among populations of H. floedae suggests a recent spread, perhaps due to the introduction of R. catesbeiana for culture to the western United States, southeast Mexico, and Costa Rica.
  Journal of Parasitology 09/2005; 91(4):915-21. · 1.40 Impact Factor
• Article: Dichelyne (Dichelyne) bonacii n. sp. (Nematoda: Cucullanidae) from the grey snapper Lutjanus griseus and the black grouper Mycteroperca bonaci off the coast of Yucatán, Mexico.

  David González-Solís, Nelly Argáez-García, Sergio Guillén-Hernández
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  ABSTRACT: A new cucullanid, Dichelyne bonacii n. sp., is described from the intestine of the grey snapper Lutjanus griseus and the stomach of the black grouper Mycteroperca bonaci off the coast of Yucatán. The absence of a ventral precloacal sucker and the presence of 11 pairs of caudal papillae in males allocate it to the subgenus Dichelyne. It differs from its congeners in body dimensions and by having two almost equal spicules (left 712-950 and right 722-945microm), two intestinal caeca and in the position of the deirids and excretory pore. Apparently, L. griseus acts as definitive host of this species, whereas M. bonaci may be considered as a postcyclic host. This new species represents the first record of a nematode of the subgenus Dichelyne in marine fishes of Mexico.
  Systematic Parasitology 11/2002; 53(2):109-13. · 1.25 Impact Factor