In a specimen described by Livezey (1949) from Walker County, Texas, 11 of 17 crossbands were not joined middorsally, while on one side, three of the crossbands were fused together longitudinally to form a continuous, undulating band, surmounted above by a dark stripe that was 2.0–2.5 scales wide. They are commonly called copperheads or Australian copperheads. * [http://www.whozoo.org/Intro99/ehrich/bencopperhead.html Trans-Pecos Copperhead] at [http://www.whozoo.org/ WhoZoo] . [3] The generic name is derived from the Greek words ancistro (hooked) and odon (tooth), or fishhook. The species can be difficult to distinguish from the broad-banded copperhead, A. c. laticinctus. [26] The antivenom can cause an immune reaction called serum sickness. Agkistrodon contortrix pictigaster is a venomous pitviper subspecies [2] found in the Trans-Pecos region of the United States, in western Texas, and northeastern Mexico. [5], The body is relatively stout and the head is broad and distinct from the neck. Telotorniti e Boomslang (vedi schede) gonfiano il collo in modo diverso dai cobra, accentuandone il diametro in senso verticale. The species is endemic to the southeastern United States. Deinagkistrodon is a monotypic genus created for the venomous pit viper species, D. acutus, which is endemic to Southeast Asia. Gli americani distinguono i Water moccasins (Agkistrodon piscivorus), e gli Highland moccasins o Copperhead (Agkistrodon contortrix) serpenti di abitudini decisamente meno acquatiche. I testa-di-rame sono ovovivipari e mettono al mondo da tre a dodici piccoli, lunghi circa 20 cm e già dotati di sistema velenifero efficace. OK. Il corpo è relativamente spesso, senza tuttavia essere tozzo come in certe vipere, la coda è sottile ed a volte distinguibile dal resto del corpo. Le femmine, ovovivipare, mettono al mondo 3-12 piccoli di 20 cm © Giuseppe Mazza. Their actual color varies by locality, varying from a red-brown, to a gray-brown. 5 Agkistrodon contortrix pictigaster; Agkistrodon contortrix contortrix . It is easily distinguished from other subspecies of copperhead, in that other species typically have banding that narrows at the spine, creating hourglass shapes, whereas "A. c. pictigaster" has bands that do not narrow at the spine. The subspecies is found in the southeastern United States, particularly in Florida. Agkistrodon contortrix pictigaster is a venomous pitviper subspecies found in the Trans-Pecos region of the United States, in … Agkistrodon contortrix males have longer tongue tine lengths than females during the breeding season, which may aid in chemoreception of males searching for females. It is easily distinguished from other subspecies of copperhead, in that other species typically have banding that narrows at the spine, creating hourglass shapes, whereas "A. c. pictigaster" has bands that do not narrow at the spine. The species can be difficult to distinguish from the Broad-banded Copperhead, "A. c. laticinctus". I Testa-di-rame, così chiamati per la loro colorazione, sono diffusi negli stati Sud-orientali degli Stati Uniti, e si nutrono prevalentemente di topi ed altri roditori, anche se la dieta può essere ben più varia, comprendendo altri mammiferi di piccole dimensioni, batraci (pur essendo rettili più terricoli dei mocassini acquatici, anche i testa-di-rame gradiscono la vicinanza dell’acqua ed i terreni paludosi), lucertole, altri serpenti e persino insetti. These are also the only viperids found in the Americas. Like most pit viper species, A. contortrix has a hemotoxic venom, which is delivered through hinged, hollow fangs set in the front of their jaw. Agkistrodon howardgloydi is a species of pit viper, a venomous snake in the subfamily Crotalinae in the family Viperidae. Head of copperhead photographed in Rheinberger Terra-Zoo, Germany. Their diet consists of primarily lizards, frogs, and rodents. The color fades to a grey or brown at about a year of age. Le zanne velenifere, come quelle di tutti i crotali, sono tenute normalmente ripiegate e vengono estroflesse solo quando il serpente spalanca la bocca. They frequently stay still even when approached closely, and generally strike only if physical contact is made. Ma questi nomi “volgari” andrebbero, forse, evitati, perché molti profani, chiamano mocassini d’acqua anche altre specie acquatiche non velenose, appartenenti al genere Nerodia, e questa confusione “sul campo” potrebbe portare a spiacevoli conseguenze, soprattutto per chi cercasse di catturarli. A. contortrix was long considered to contain five subspecies listed below. https://it.wikipedia.org/w/index.php?title=Agkistrodon_contortrix&oldid=111374278, licenza Creative Commons Attribuzione-Condividi allo stesso modo. Six species are currently recognized. Il Testa di rame settentrionale o Northern copperhead (Agkistrodon contortrix mokasen) che presenta macchie color castagna, larghe ai lati e strette dorsalmente. Eastern copperhead (Agkistrodon contortrix) from Arkansas about to eat a Cicada. Their choice of habitat is the driest among the copperhead subspecies, preferring rocky, lightly vegetated, canyon areas. La parte ventrale, come dice il nome scientifico, e a differenza della maggior parte dei serpenti, è scura. This species is capable of vibrating its tail in excess of 40 times per second— faster than almost any other non-rattlesnake snake species.[21]. Il Testa di rame trans-Pecos o Trans-Pecos copperhead (Agkistrodon contortrix pictigaster): assomiglia parecchio al “bande larghe”, sia per dimensioni (75 cm), sia perché porta bande ampie, che però hanno un’”anima” più chiara all’interno. [7], It is found in North America; its range within the United States is in Alabama, Arkansas, Connecticut, Delaware, Northern Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Mississippi, Missouri, Nebraska, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Texas, Virginia and West Virginia. Adult copperheads average 76 cm in length and are normally described as heavy-bodied snakes. They grow to approximately 20-36 inches in length. Palmer, William M.; Braswell, Alvin L. (1995). This is the world's only semiaquatic viper, usually found in or near water, particularly in slow-moving and shallow lakes, streams, and marshes. L’aggiunta dell’aggettivo “americano” è d’obbligo, per non fare confusione con i Testa di rame australiani (vedi Austrelaps superbus), serpenti velenosi appartenenti agli elapidi, con zanne fisse, mentre quelle dei copperhead sono ripiegabili. They are ovoviviparous, giving birth to a litter of up to 8 young in the early fall. The common names suggest they are able to leap at an attacker, but this is likely exaggerated. 361-383. The only notable physical difference between the subspecies is that the Trans-Pecos copperhead tends to have an elaborately patterned underside, often being an irregular, white and black pattern whereas the broad-banded tends to be plain white, only have minimal patterning, or have elongated random blotching instead of a distinct pattern. ** [http://www.zo.utexas.edu/research/txherps/snakes/agkistrodon.contortrix.html "Agkistrodon contortrix"] at [http://www.utexas.edu/ University of Texas] . [23] The type of parthenogenesis that likely occurs is automixis with terminal fusion, a process in which two terminal products from the same meiosis fuse to form a diploid zygote.
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