Stamp: Sharp-nosed Pit Viper (Agkistrodon acutus) (Vietnam 1970)
Sharp-nosed Pit Viper (Agkistrodon acutus) (Vietnam 1970)
30 November (Vietnam ) within release Venomous snakes goes into circulation Stamp Sharp-nosed Pit Viper (Agkistrodon acutus) face value 12 Vietnamese xu
| Stamp Sharp-nosed Pit Viper (Agkistrodon acutus) in catalogues | |
|---|---|
| Michel: | Mi:VN 641U |
Stamp is square format.
Also in the issue Venomous snakes:
- Stamp - MacClelland's Coral Snake (Calliophis macclellandi) face value 20;
- Stamp - Banded Krait (Bungarus faciatus) face value 50;
- Stamp - Common Green Pit Viper (Trimeresurus grumineus) face value 1;
- Stamp - Sharp-nosed Pit Viper (Agkistrodon acutus) face value 12;
- Stamp - MacClelland's Coral Snake (Calliophis macclellandi) face value 20;
- Stamp - Banded Krait (Bungarus faciatus) face value 50;
- Stamp - Common Green Pit Viper (Trimeresurus grumineus) face value 1;
Stamp Sharp-nosed Pit Viper (Agkistrodon acutus) it reflects the thematic directions:
Snakes are elongated, limbless reptiles of the suborder Serpentes Like all other squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales. Many species of snakes have skulls with several more joints than their lizard ancestors, enabling them to swallow prey much larger than their heads (cranial kinesis). To accommodate their narrow bodies, snakes' paired organs (such as kidneys) appear one in front of the other instead of side by side, and most have only one functional lung. Some species retain a pelvic girdle with a pair of vestigial claws on either side of the cloaca. Lizards have independently evolved elongate bodies without limbs or with greatly reduced limbs at least twenty-five times via convergent evolution, leading to many lineages of legless lizards. These resemble snakes, but several common groups of legless lizards have eyelids and external ears, which snakes lack, although this rule is not universal (see Amphisbaenia, Dibamidae, and Pygopodidae).
