Wetland-ecology
Guides
Aclerdidae
Aclerdid Scales, Flat Grass Scales
Aclerdidae is a family of scale insects (superfamily Coccoidea) comprising five genera and approximately 58 species. Members are specialized herbivores primarily associated with grasses (Poaceae), where they inhabit leaf sheaths and feed on plant sap. The family exhibits highly derived morphology including leglessness, reduced antennae, and unique anal apparatus. Several species have become economically significant as pests of agricultural and wetland grasses, including the invasive roseau cane scale (Nipponaclerda biwakoensis) in North America and Aclerda takahashii on sugarcane.
Brachinus
bombardier beetles
Brachinus is a genus of ground beetles commonly known as bombardier beetles, native to the Nearctic, Palearctic, Near East, and North Africa. The genus is renowned for its explosive defensive chemistry, wherein beetles discharge a hot, noxious spray from the abdomen when disturbed. Species within Brachinus exhibit diverse ecological strategies: wetland-associated species are pupal ectoparasitoids of water beetles (Dytiscidae, Gyrinidae, Hydrophilidae), while dryland species such as B. explodens and B. crepitans parasitize ground beetle pupae of the genus Amara (Carabidae). The genus has been extensively studied for its chemical ecology, parasitoid life history, and habitat associations across agricultural and natural landscapes.
Disholcaspis prehensa
clasping twig gall wasp
Disholcaspis prehensa is a gall-inducing cynipid wasp native to California that induces distinctive galls on scrub oak and leather oak. The species exhibits heterogony, alternating between sexual and asexual generations that produce two morphologically different gall types. The asexual generation forms conspicuous mushroom-shaped twig galls with clasping bases, while the sexual generation produces small, hidden bud galls.
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hastata
Citrine Forktail
Ischnura hastata, the Citrine Forktail, is a small damselfly with remarkable reproductive diversity across its range. Native populations in North America exhibit typical sexual reproduction, while populations in the Azores archipelago represent the only known example of parthenogenesis in the order Odonata. A population in the Galápagos Islands has evolved monandry (single mating per female), driven by extremely short adult lifespans of 1–3 days. The species occupies diverse wetland habitats from temperate North America to oceanic islands.
Somatochlora hineana
Hine's Emerald, Hine's Emerald Dragonfly
Somatochlora hineana is a rare dragonfly species endemic to North America, listed as endangered in Canada since 2011 and of conservation concern in the United States. The species is highly specialized, requiring groundwater discharge areas in wetland habitats to complete its life cycle. It exhibits habitat segregation between sexes and has been documented with biased sex ratios, factors that complicate conservation efforts. The Canadian population is restricted to the Minesing Wetlands in Ontario, while U.S. populations occur in Michigan and other states with suitable calcareous wetland habitats.