Established
| Common name (English) | |
|---|---|
| Chrysomphalus aonidum | Florida red scale, Egyptian black scale, Circular black scale, Citrus black scale |
| Chrysomya albiceps | |
| Cingulina isseli | |
| Cirsium arvense | |
| Cistus ladanifer | Gum rockrose |
| Citrostichus phyllocnistoides | |
| Clavelina oblonga | Light-bulb sea squirt |
| Clematis vitalba | Old man's beard |
| Closterocerus chamaeleon | |
| Coccidoxenoides perminutus | |
| Coccophagus scutellaris | |
| Coccus hesperidum | Brown soft scale |
| Coccus pseudomagnoliarum | Citricola scale |
| Comperiella bifasciata | |
| Conomurex persicus | |
| Contarinia citri | Citrus blossom midge |
| Corchorus olitorius | Jew's-mallow |
| Cordia myxa | Pidar |
| Corticaria pubescens | |
| Coryphellina rubrolineata |