Pituophis melanoleucus


Pituophis melanoleucus, commonly known as the pine snake, is a species of nonvenomous snake in the family Colubridae. The species is endemic to the southeastern United States. Three subspecies are currently recognized as being valid.

Taxonomy and etymology

Three subspecies of Pituophis melanoleucus are currently recognized: the nominate subspecies P. m. melanoleucus, the northern pine snake; P. m. lodingi, the black pine snake; and P. m. mugitus, the Florida pine snake.
The subspecific name lodingi is in honor of Danish-born amateur herpetologist Peder Henry Löding, who lived in Alabama.
The species has a variety of common names, including: pine snake, pinesnake, common pine snake, bullsnake, black and white snake, carpet snake, chicken snake, common bullsnake, eastern bullsnake, eastern pine snake, horn snake, New Jersey pine snake, North American pine snake, northern pine snake, pilot snake, and white gopher snake.

Description

Adults of P. melanoleucus are large, growing to in total length and are powerfully built. The head is small and somewhat pointed with an enlarged rostral scale that extends upward between the internasal scales. Usually, four prefrontal scales are seen. At midbody are 27-37 rows of keeled dorsal scales. The anal plate is single. The color pattern consists of a light ground color overlaid with black, brown, or reddish-brown blotches.

Geographic range and habitat

The species P. melanoleucus is found in the United States in Alabama, Florida, Georgia, Kentucky, Louisiana, Mississippi, New Jersey, North Carolina, South Carolina, Tennessee, Delaware and Virginia. The nominate subspecies occurs in southern New Jersey, southern North Carolina west through South Carolina to northern Georgia, eastern Tennessee, southeastern Kentucky and south into Alabama. P. m. lodingi occurs from southwestern Alabama to eastern Louisiana, overlapping with P. m. mugitus from southern South Carolina to Georgia and southern Florida. A population of the subspecies, originating from released or escaped pets, has established itself in the Netherlands in the coastal dunes and dune forests around Wassenaar.
The pine snake inhabits pine flatwoods, sandy pine-oak woodlands, prairies, cultivated field, open brushland, rocky desert and chaparral. It occurs from sea level to an elevation of. The pine snake requires well-drained, sandy soils with little vegetation for use as nesting and hibernation sites.

Ecology

The pine snake preys on rats, mice, moles and other small mammals and eggs. It often enters rodent burrows in search of a meal. In these cases, multiple kills are frequent, with the snake pressing the mice against the walls of the burrow. The snake remains underground in cold weather or during the heat of summer days.
When disturbed, it often hisses loudly, sometimes flattening its head, vibrating its tail, and eventually striking at an intruder. To make the rattling sound, the snake forces air out of its lungs, vibrating the epiglottis.

Reproduction

After mating has taken place in spring, clutches of three to 24 eggs are laid in June–August. The eggs are deposited in sandy burrows or under large rocks or logs and hatch after 64–79 days of incubation. The eggs are adherent and quite large, up to long by wide. Hatchlings measure.

Conservation status

The pine snake is classified as least concern on the IUCN Red List, due to its wide distribution and large number of subpopulations; while the total populations appears to be declining, this is likely happening at a slow rate. However, the species is thought to be impacted by continued habitat degradation and destruction. It is present in a variety of protected areas.