The Ring-necked Snake or Ring-neck
Snake, Diadophis punctatus, is a species of colubrid snake found throughout
much of the U.S, central Mexico, and southeastern Canada. Ring-necked snakes
are secretive, nocturnal snakes, so are hardly seen during the day time. They’re
somewhat venomous, but their nonaggressive nature and small, rear-facing fangs
pose slight threat to humans who wanted to handle them. They’re best known for
their distinctive defense posture of curling up their tails, exposing their
bright red-orange posterior, ventral surface when threatened. Ring-necked
snakes are assumed to be fairly plentiful throughout most of their range,
though no scientific evaluation supports this theory. Because scientific
research is lacking for the ring-necked snake, and more in-depth investigations
are greatly required. It is the only species within the genus Diadophis, and presently
14 subspecies are identified, but several herpetologists question the
morphologically based classifications.
The physical description describes
this snake is the defensive display of a San Bernardino ring-necked snake and
are fairly similar in morphology throughout much of their distribution. Its
dorsal coloration is solid olive, brown, bluish-gray to black, broken only by a
distinct yellow, red, or yellow-orange neck band. A few populations in New
Mexico, Utah, and other distinctive locations do not have the distinctive neck
band. Moreover, individuals may have abridged or partially colored neck bands
that are hard to distinguish; coloration may also be more of a cream color slightly
than bright orange or red. Head coloration tends to be slightly darker than the
rest of the body, with tendencies to be blacker than grey or olive. Ventrally,
the snakes exhibit a yellow-orange to red coloration broken by crescent-shaped
black spots along the margins. Certain individuals lack the distinct ventral
coloration, but naturally retain the black spotting. Infrequently, individuals
lack both the ventral or neck band coloration, so the use of those two
characteristics is the simplest way to distinguish the species.
The snake size also varies across
the species distribution. Naturally, adults measure 25–38 cm and in length,
except for D. p. regalis, which measures 38–46 cm. First-year juvenile snakes
are normally about 20 cm and grow about 2–5 cm a year depending on the
developmental stage or resource availability. Ring-necked snakes have flat
scales with 15-17 scale rows at midbody. Males typically have small tubercles
on their scales just anterior to the vent, which are generally absent in
females. Ring-necked snakes are fairly common throughout much of the United
States extending into southeastern Canada and central Mexico. Eastern
populations cover the whole Eastern Seaboard from the Gulf of Saint Lawrence
continuous through the Gulf Coast of Texas. Distribution moves inland into
northern Minnesota, ongoing diagonally through the United States to include all
of Iowa, eastern Nebraska, and most of Kansas. In the western United States,
the distribution is meaningfully less continuous, with spotty, distinctive
population segments through most of the Pacific Northwest. Populations extend
from south-central Washington continuing along the extreme West Coast into
Mexico. Population segments extend inland into western Idaho, through southern
Nevada, into central Utah, and continuing south through Arizona and central
Mexico.
Ring-necked snakes occur in an extensive
variety of habitats. Preference seems to be determined by areas with plentiful
cover and denning locations. Northern and western species are found within open
woodlands close to rocky hillsides, or in wetter environments with plentiful
cover or woody debris. Southern species exist mainly within riparian and wet
environments, particularly in more arid habitats. Stebbins in 2003 recognized
the species as a snake of moist habitats, with moist soil conditions the
preferred substrate. Ring-necked snakes cannot found above an elevation of 2200
m. In northern regions, dens are also important in classifying suitable
ring-necked snake habitat. Dens are typically shared communally, and are
identifiable by an existent subsurface crevasse or hole deep enough to avoid
freezing temperatures. Since it is a woodland reptile, it can also usually be
found under wood or scraps. Because of hot weather, they tend to make holes and
burrows, or they hide under rocks or any appropriate material. They are generally
found in flatland forests.
No comments:
Post a Comment