The three sea urchin species shown below are separated by gametic isolation.Do these species fit the definition of species as defined by the biological species concept? Why or why not? 
Definitions:
Gram-negative
Refers to bacteria that have a specific cell wall structure which does not retain the crystal violet stain used in Gram's method of staining; often associated with higher resistance to antibiotics.
Lipids
A broad class of biomolecules that are insoluble in water and include fats, oils, and cholesterol, playing key roles in energy storage and cell structure.
Peptidoglycans
A complex polymer of amino sugars and amino acids that forms a mesh-like layer outside the plasma membrane of most bacteria, providing structural support and shape.
Koch's Postulates
A set of criteria for establishing a causative relationship between a microbe and a disease, including isolation, reproduction of symptoms, and re-isolation of the microbe.
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