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- Hernandez-Jimenez, Armando; Rios-Cardenas, Oscar
- Animal behaviour 2012 v.84 no.4 pp. 1051-1059
- Thorichthys, etc ; Xiphophorus helleri; body size; females; fish; males; predation; predators; risk; sexual selection; Show all 10 Subjects
- ... In general, we assume that natural (predation-mediated) and sexual selection have opposing effects on the evolution of characters that serve as ornaments. Males of most swordtail fishes (genus Xiphophorus) have an elongation of the caudal fin known as the sword that is used to attract females, as it increases apparent body size of males. By increasing apparent body size, the sword may also attract ...
- Caspeta-Mandujano, J.; Salgado-Maldonado, G.; Martínez-Ramírez, E.
- Helminthologia 2010 v.47 no.1 pp. 33-37
- Thorichthys, etc ; Nematoda; eggs; females; freshwater fish; intestines; males; sclerotization; tail; Mexico; Show all 10 Subjects
- ... A new nematode species, Cucullanus oaxaquensis n. sp., is described from specimens recovered from the intestine of Thorichthys helleri Steindachner, 1864 from the Ró Modelo, Los Chimalapas, state of Oaxaca, Mexico. It is characterized largely by possesing unusual features among Cucullanus spp., i.e., net-like sculpture on the surface of eggs, a pair of small papillae near tail tip of females and a ...