Simocephalus

Schoedler, 1858

water flea

Species Guides

Simocephalus is a of freshwater cladoceran crustaceans commonly known as water fleas. Members exhibit the characteristic cladoceran with alternating parthenogenetic and phases. The genus has been studied extensively for reproductive , with environmental factors such as temperature, food concentration, crowding, and illumination influencing traits.

Simocephalus mixtus by (c) Joseph McPhail, some rights reserved (CC BY), uploaded by Joseph McPhail. Used under a CC-BY license.

Simocephalus by (c) Ivan Sinkov, some rights reserved (CC BY), uploaded by Ivan Sinkov. Used under a CC-BY license.

Simocephalus serrulatus by no rights reserved, uploaded by Ken Kneidel. Used under a CC0 license.

Pronunciation

How to pronounce Simocephalus: /ˌsaɪmoʊˈsɛfələs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Images

Habitat

Freshwater environments; primarily ponds and standing water bodies

Distribution

Recorded from Denmark, Norway, and Sweden; broader distribution includes lentic freshwater across multiple regions

Life Cycle

Alternating parthenogenetic () and gamogenetic (sexual) . dominates under favorable conditions, producing that develop directly into females. is triggered by environmental deterioration (crowding, temperature changes, food limitation), producing haploid eggs requiring ; these develop into resting eggs enclosed in an ephippium for or surviving unfavorable conditions. Males are produced parthenogenetically when conditions induce sexuality. An intermoult cycle related to egg laying causes variation in pigmentation.

Similar Taxa

DaphniaBoth are cladoceran water fleas in Daphniidae with similar body plans and reproductive strategies; Simocephalus distinguished by and antennal features
CeriodaphniaSmaller cladoceran in same ; Simocephalus typically larger with different shape and chamber characteristics