Morpho-molecular characterization and phylogenetic relationships of Encotyllabe percussa n. sp. (Monogenea: Capsalidae) from the spangled emperor Lethrinus nebulosus (Teleostei, Lethrinidae).

Encotyllabe percussa n. sp. is proposed based on morphology and DNA sequences analysis of ribosomal (18S, 28S) and mitochondrial (COI) gene fragments.

A new genus and two new species of trypanorhynch cestodes (Tentaculariidae) from the sharksCarcharhinus sorrah(Müller & Henle) andSphyrna lewini(Griffith & Smith) from off the coasts of Malaysia and Mexico.

Two new tentaculariid species were found infecting carcharhiniform sharks from off the coasts of Malaysian Borneo and the southwestern coast of the Baja California Sur, Mexico. Both new species exhibit a homeoacanthous heteromorphous basal and a homeoacanthous homeomorphous metabasal armature. Since this hook arrangement is unique within the tentaculariids and the taxonomy in this group deeply depends on the tentacular armature, Reimeriella n.

Krill Nyctiphanes simplex gonad affection associated with acute-intensity phyllobothriid plerocercoid infection.

This is the first acute-intensity record of helminths parasitizing the subtropical krill Nyctiphanes simplex Hansen, 1911. We briefly describe the pathology of infection of Phyllobothriidae gen. sp.

Phylogenetic placement and microthrix pattern of Dollfus, 1966 (Trypanorhyncha) from krill Hansen, 1911.

Plerocerci of the monotypic were found parasitizing the subtropical neritic krill in the Gulf of California, Mexico. The plerocerci were recovered from two microhabitats of the intermediate host, typically embedded inside the digestive gland (hepatopancreas) or rarely in the hemocoel. The morphology of the simple, single-layered blastocyst surrounding the entire scolex is unique within the Trypanorhyncha by having four large funnel-like pori or openings possibly with feeding and/or excretory function.

New insights on the role of the holoplanktonic mollusk Firoloida desmarestia (Gastropoda: Pterotracheidae) as host for digenetic trematodes.

Interactions of holoplanktonic mollusks with symbionts and parasites are poorly known. We investigated the ecology of infection (prevalence, intensity, and abundance) in Firoloida desmarestia, caught during two sampling campaign sessions in 2012, off the Baja California Peninsula, Mexico (IMECOCAL, 83 stations) and a coastal research center near La Sorpresa Beach, Baja California Sur, in the Gulf of California (14 stations). Only females of F.

Larval trematodes Paronatrema mantae and Copiatestes sp. parasitize Gulf of California krill (Nyctiphanes simplex, Nematoscelis difficilis).

During 4 quantitative-systematic oceanographic cruises at 99 sampling stations in the Gulf of California (January and July 2007, August 2012, and June 2013), we found 2 trematode species (non-encysted mesocercaria stage) parasitizing the hemocoel of 2 krill species at near-shore locations. Copiatestes sp. parasitized Nematoscelis difficilis in January 2007, and Paronatrema mantae parasitized Nyctiphanes simplex in July 2007.