Marcelo Silva-Briano

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The species group of Alona karua is raised to generic rank and named Karualona. The genus is defined on the basis of a number of characters of the body and its appendages. Tentative new microcharacters are introduced, related to the type and length of selected setae of P1, P2, P3 and P4. Two new species are described, one from the island of Socotra and one(More)
An investigation, using optical microscopy and SEM, of the trunk limbs of the Anomopoda has revealed a large number of characters, previously underused or unused in taxonomy and comparative morphology. All these characters, which are nicely paralleled by some more conventional traits (head shield and pores, postabdomen, antennae ...), show one clear(More)
We observed different morphotypes of some species in the family Brachionidae from the seasonal plankton samples of Lake Xochimilco collected during 2002–2003. We measured the body length, width, and spine lengths (posterior and anterior spines) of Brachionus havanaensis, Keratella americana, K. cochlearis and K. tropica during the periods when the predator(More)
Daphnia curvirostris is a typical European species but has also been recorded in Canada and USA. This is a new record for Mexico and the taxon was collected from the Chimaliapan wetlands (State of Mexico, Mexico). Taxonomic descriptions of it are provided using both light and scanning-electron microscopes. When cultured on the green alga Scenedesmus acutus(More)
Each of the five pairs of trunk limbs of theChydoridae and Macrothricidae contains one or severalcuticular pores, some of which connect to glands whichsecrete to the filter chamber. They are situated in afixed or a variable position, usually on the endite ofthe limb.Limbs 2 to 5 are also equipped with small sensoryorgans which may be apically perforated or(More)
Entamoeba histolytica invades the intestine and other organs during the pathogenesis of amoebiasis. In the early stages, the host organism responds with an inflammatory infiltrate composed mostly of neutrophils. It has been reported that these immune cells, activated by E. histolytica, exert a protective role by releasing proteolytic enzymes and generating(More)
Macrothix laticornis is redescribed and compared with populations from central North America (Mexico), and from south-east Asia (Vietnam). All three are closely related, but with sufficient morphological differences to establish a laticornis species-group. Two species new for science are described, viz. M. sierrafriatensis (Mexico) and M. vietnamensis(More)