Marietta Motschulsky, 1863: 51. Type species: Marietta leopardina Motschulsky, by monotypy.
- Body very small in size (0.5-1.0 mm long), usually pale coloured, with a beautiful pattern of dark bands or spots or both on head, thorax, gaster and legs
- Antenna 6-segmented in female (antennal formula 1-1-2-2 or 1131), F1 and F2 transverse, anelliform. Antenna in male 5-segmented in male (1-1-2-1)
- Pronotum narrow and transverse, entire / composed of a single plate
- Fore wing of almost all known species characteristic, conspicuously maculated with a dark and light pattern of setae; marginal vein longer than costal cell, parastigma well developed, postmarginal vein absent, stigmal vein barely visible to punctiform; linea calva distinct
- Mesopleuron large and undivided as in encyrtids
- Axillae hardly projecting forwards
- Adults commonly collected in association with scales and mealybugs as hyperparasitoids
Known from Oriental, Nearctic, Neotropical, Palaearctic and Indo-Pacific regions.
Species in India
1. Marietta carnesi (Howard) (India: Jammu & Kashmir; Uttar Pradesh)
2. Marietta leopardina Motschulsky (Almost throughout India)
3. Marietta picta (André) (India: Uttar Pradesh)
Similar looking genera
This genus is similar to Paraphytis Compere in general appearance.
- Hayat, M. 1986. Notes on some species of Marietta (Hymenoptera: Aphelinidae), with a key to world species. Colemania, 2: 1-18.
- Hayat, M. 1998. Aphelinidae of India (Hymenoptera: Chalcidoidea): A taxonomic revision. Memoirs of Entomology, International. Vol. 13. Associated Publishers. Gainesville. 416 p.