There are many gram-positive aerobic bacteria that can utilize citrate and dextrose. To narrow down the possibilities, we need more information.

Please provide more context, such as:

* What is the environment where this bacteria is found? (e.g., soil, water, human body)

* What are the specific characteristics of the bacteria? (e.g., morphology, colony appearance, growth conditions)

* Is there any other information about its metabolic capabilities? (e.g., does it produce any specific enzymes, does it require specific nutrients)

Once you provide more details, I can help you identify the specific bacteria you are looking for.