Occurrence of abnormalities on labral keel of Coronatella monacantha (Cladocera, Anomopoda, Chydoridae) in a population from Ceará, Brazil

Morphological abnormalities in cladocerans related to eutrophication of a tropical reservoir

“…Chemical contaminants or bacteria and viruses, may have caused changes in helm, rostrum and the ventral margin of the carapace of some species of daphnids, in reservoir cascade of medium and low Tietê River (Zanata et al, 2008). Iron bioaccumulation by Coronatella monacantha Sars, 1901 may have caused abnormalities in the labrum of the keel in species of a stream in Ceará State, Brazilian Northeast (Sousa et al, 2011) …”

“…Some authors have recorded Cladocera (Crustacea: Branchiopoda) morphological alterations generated by anthropogenic activities (Omair et al, 1999;ElmoorLoureiro, 2004;Sinev, 2000;Zanata et al, 2008;Sousa et al, 2011). Omair et al (1999) reported abnormalities in cladocerans and copepods, in the Lake Michigan, and suggested that the abnormalities are a recent global phenomenon and probably due to the anthropogenic actions.…”

New additions to the cladoceran fauna of Ciénaga Grande de Santa Marta and Colombia

“…At one side of the labrum there can be outgrowths (Soussa et al 2011); the postabdominal claw with fine pectens was not mentioned by Sinev (2004).…”

Abnormalities in a Pleuroxus aduncus (Jurine, 1820) population (Crustacea: Cladocera: Chydoridae)

“…Morphological abnormalities in Cladocera have recently been described for the genera Ilyocryptus (Kotov, Dumont, 2000;Elmoor-Laurero, 2004), Daphnia (Zanata et al, 2008;De Melo et al, 2017), Coronatella (Sousa et al, 2011), Ceriodaphnia, Chydorus and Bosmina (De Melo et al, 2017). For Pleuroxus gynandromorphism is recorded (Frey, 1965).…”

“…Several causes for abnormalities in cladocerans are suggested. Influences of toxic substances (Elmoor-Laurero, 2004;Zanata et al, 2008;Sousa et al, 2011), eutrophication (De Melo et al, 2017) and the environment in the culture (Kotov, Dumont, 2000). Kotov & Dumont (2000) described some abnormal individuals of the Ilyocryptus spinifer speciesgroup found in Sars collection.…”