Parameters for Districts or Countries are easy to understand while having a quick look at the search form.
To query a catalogue by Taxa, there are many more options that you can use.
You can create a simple query starting from arbitrary Boolean expressions containing key words AND, OR and NOT. Expressions can be grouped with brackets.

Examples :

• To find all pages with "Neobisnius", you can type Neobisnius or use the star (*): neob*.
• To find a species (e.g. Philonthus decorus), you must type Philonthus AND decorus