Neoplea

Neoplea species are distinguished from other Pleidae by subtle morphological differences; the genus can be separated from the Old World genus Plea by geographic distribution (Neoplea: New World; Plea: Old World) and genitalic characters. Species-level identification requires examination of male genitalia and other fine structural features. Neoplea striola, the type species, has been characterized in life history studies but diagnostic external features for field identification are not well documented in accessible literature.

Lentic freshwater environments including small ponds, temporary water bodies, and fishless subtropical lowland freshwaters. Tolerates low oxygen conditions. Habitats typically lack fish predators and often lack Daphnia, with zooplankton communities dominated by copepods.

North America and South America. Documented from southern Illinois (USA), central Texas (USA), and Colombia (Complejo Humedales Hato Corozal, Cienaga Zapatosa, Ciénaga San Silvestre). The genus is widespread in the New World tropics and subtropics.

In southern Illinois, Neoplea striola is apparently univoltine: adults become active in early March, first instars appear mid-May, with overlapping subsequent instars; no active adults found after November. Overwinters as adults.

Predaceous insects occupying the top predator niche in small fishless water bodies. Experimental studies on Neoplea striola found no significant evidence of trophic cascades; weak or absent top-down effects on phytoplankton through zooplankton predation. Copepod-dominated zooplankton communities with fast escape responses may limit predation effectiveness.

• PleaThe only other genus in family Pleidae; distinguished by Old World distribution (Europe, Africa, Asia, Australia) versus New World distribution of Neoplea, and by differences in male genitalia structure.

• aquatic
• predator
• freshwater
• Hemiptera
• Pleidae
• New World
• zooplanktivore

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Life History of <i>Neoplea Striola</i> (Hemiptera: Pleidae)
• Beyond the fish-Daphnia paradigm: testing the potential for pygmy backswimmers (Neoplea striola) to cause trophic cascades in subtropical ponds
• Beyond the fish- Daphnia paradigm: testing the potential for Neoplea striola (Hemiptera: Pleidae) to cause a trophic cascade in subtropical ponds