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X-ray showing the skeleton of Typhlonectes (Typhlonectidae). Caecilians' anatomy is highly adapted for a burrowing lifestyle. In a couple of species belonging to the primitive genus Ichthyophis vestigial traces of limbs have been found, and in Typhlonectes compressicauda the presence of limb buds has been observed during embryonic development, remnants in an otherwise completely limbless body. [7]
Litters of 20–40 are common, [5] although fewer offspring may occur, as few as one. [17] The reported maximum is 75 [24] in a single litter. At birth, juveniles are 215–260 mm (8.5–10.2 in) in total length. The minimum total length for a gravid female is about 100 cm (39 in). It seems that sexual maturity is achieved in 2–3 years.
The Vienna specimen of Atretochoana is a large caecilian at a length of 72.5 cm (28.5 in), [7] while the Brasília specimen is larger still at 80.5 cm (31.7 in). [8] By comparison, caecilians in general range in length from 11 to 160 cm (4.3 to 63.0 in).
Adults of E. conicus may attain a total length of 3 feet 3 inches (99 cm), which includes a tail 3 inches (76 mm) long. The anterior maxillary and mandibular teeth are longer than the posterior. The head is covered with small scales. The eye is small with a vertical pupil. The dorsal scales are small and keeled. The tail is pointed, not or but ...
Physella acuta is a species of small, left-handed or sinistral, air-breathing freshwater snail, an aquatic gastropod mollusk in the family Physidae. Common names include European physa , tadpole snail , bladder snail , and acute bladder snail .
The tail of the snake is paddle-shaped and adapted to swimming. [5] On average, the total length of a male is 875 mm (2 ft 10.4 in) long, with a 13 cm (5.1 in) long tail. Females are significantly larger, with an average total length of 1.42 m (4 ft 8 in) and a tail length of 145 mm (5.7 in). [3]
Shaw's sea snake, short sea snake, Hardwicke's sea snake, spine-bellied sea snake H. cyanocinctus: Daudin, 1803 0 annulated sea snake, blue-banded sea snake H. czeblukovi (Kharin, 1984) 0 fine-spined sea snake H. donaldi [3] Ukuwela, K. Sanders & B. Fry, 2012 rough-scaled sea snake Northern Australia: H. elegans (Gray, 1842) 0 elegant sea snake ...
Head of a northern snakehead. The distinguishing features of a northern snakehead include a long dorsal fin with 49–50 rays, [6] an anal fin with 31–32 rays, a small, anteriorly depressed head, the eyes above the middle part of the upper jaw, a large mouth extending well beyond the eye, and villiform teeth in bands, with large canines on the lower jaw and palatines.