[4] This species has a wide distribution that includes Rio Grande do Sul in Brazil, northern Argentina, extending to the border areas of Bolivia and Paraguay, and in Uruguay, it's found throughout its territory.

[4] The venom of P. lemniscatus is composed of protein families typically present in snake venom, such as metalloproteinase and serine proteases, L-amino acid oxidases, Phospholipases A2s, C type lectines-like, Kunitz-type proteins, and three finger toxins.

Activity assays demonstrated a highly Gelatinolytic component, as well as a potent capability to induce blood coagulation.

[5] Although bites by this species are rare, two important cases were recorded in Uruguay: a healthy 13-year-old patient was admitted to the emergency room for gingival bleeding after being bitten 12 hours earlier.

Due to coagulopathy, she was admitted to intensive care, requiring non-invasive ventilation, received 4 vials of anti-ophidic serum, preceded by corticosteroids, after treatment, the patient reached normal clotting values within 36 hours.