RESUMO
Kroeyerina deetsorum n. sp. (Copepoda: Kroyeriidae) is described from female and male specimens collected from the olfactory sacs of Atlantic sharpnose sharks, Rhizoprionodon terraenovae (Richardson, 1836), captured in the Gulf of Mexico and northwestern Atlantic. Kroeyerina deetsorum is easily distinguished from known congeners by the extremely small size of its adults (i.e., females about 1.2 mm total length and males about 1.0 mm total length). Kroeyerina deetsorum is also distinguished from its congeners by possessing a subquadrate rostrum without lobes or upturned horns. It is suspected that K. deetsorum belongs to a clade within Kroeyerina whose members only infect sharks. This report also provides first descriptions of a nauplius representing Kroeyerina and copepodids representing Kroyeriidae. The early-stage copepodid of K. deetsorum lacks a frontal organ and frontal filament and uses its chelate antennae to attach to its host.
Assuntos
Crustáceos/anatomia & histologia , Tubarões/parasitologia , Olfato , Animais , Oceano Atlântico , Feminino , Louisiana , Masculino , North Carolina , TexasRESUMO
Margolisius abditus n. gen., n. sp. (Copepoda: Lernaeopodidae) is described from female specimens collected from gill lamellae of a remora, Remora remora (L.), captured in the Gulf of California near Punta Arena, Baja California. Comparison of this species with 13 lernaeopodid genera with which it shares (a) absence of posterior trunk processes; (b) presence of a relatively long cylindrical cephalothorax, usually reflected along the dorsal surface of the trunk; and (c) a marine habitat showed that it cannot be placed in any of them, thus necessitating establishment of a new genus. Margolisius abditus n. sp. is the smallest known lernaeopodid species, its ovigerous females measuring about 0.5 mm in total length.
Assuntos
Crustáceos/classificação , Ectoparasitoses/veterinária , Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Animais , Crustáceos/ultraestrutura , Ectoparasitoses/parasitologia , Feminino , Peixes , México , Microscopia Eletrônica de Varredura/veterináriaRESUMO
Os resultados do presente experimento, realizado em duas fazendas do município de Campinas, SP, demonstram que o ivermectin, quando aplicado por via oral, numa única dose de 200 mcg/kg de peso vivo, é altamente eficaz no tratamento e controle dos estágios parasitários das larvas de D. hominis (bernes) em bovinos