S. tonkinensis

S. tonkinensis may refer to:


 * Scaphis tonkinensis, an air-breathing sea slug species
 * Sindora tonkinensis, a legume species found in Cambodia and Vietnam
 * Sinogastromyzon tonkinensis, a ray-finned fish species
 * Sophora tonkinensis, a plant species used in traditional Chinese medicine.
 * Strobilanthes tonkinensis, a species of herbaceous plant used as a flavoring for tea native to Southeast Asia