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Amphisbaena alba, also known as the red worm lizard or less commonly as the white or white-bellied worm lizard, is a species of amphisbaenian in the reptilian order Squamata. Despite the large geographic range that this species covers, little is known about its ecology due to its secretive habits. A. alba has a diverse diet ranging from plant material to small vertebrates. Numerically, beetles, ants, and spiders compose the majority of their diet; however, ants, insect larvae, and beetles are ingested to satisfy a larger volume.
Reproduction for this species occurs in the dry season of its geographical area. Some evidence suggests that this species exploits the living space of the leaf-cutting ant and may even use the nests of these ants to deposit its eggs. A. alba lays the greatest number of eggs at a time (8–16) in comparison to other amphisbaenians, which is possibly due to its large body size. There is no sexual dimorphism in regard to snout-vent length, meristic, or morphometric characters for A. alba most likely due to functional constraints related to their burrowing nature.
The ultrastructure of epididymal spermatozoa has been studied for A. alba. Mature spermatozoa are filiform and are characterized by features such as a depression in the transverse section of the acrosome, a moderately long midpiece, columnar mitochondria, an elongated nucleus, and a fibrous sheath in the midpiece.
Epidermal glands are located in the cloacal region of A. alba and are most likely used for reproduction and marking territory. The openings of the glands are plugged with a solid, holocrine secretion that is removed when it moves through tunnels and leaves a secretion trail.
The stages of ultrastructural changes of organelles in developing erythroid cells are similar to the developmental changes in other vertebrate groups. The greatest difference is the periodical transverse alignment of hemoglobin molecules in the organelle matrix of the hemosomes. The transformation of the erythroid cell organelles for hemoglobin biosynthesis occurs slowly. This is due to the low metabolic rate of A. alba which is a result of the hypoxic environment where it lives.
When A. alba assumes a defensive posture it bends its body into the shape of a horseshoe and raises both the head and the tail. The tail is made of tough collagen bundles that allows the tail to absorb mechanical pressure from a bite. The body of A. alba is also covered with a flexible armor which makes other areas resistant to bites as well.
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- Ruscaia D. Teixeira, Guarino R. Colli & Sônia N. Báo (1999). "The ultrastructure of the spermatozoa of the worm lizard Amphisbaena alba (Squamata, Amphisbaenidae) and the phylogenetic relationships of amphisbaenians". Canadian Journal of Zoology 77 (8): 1254–1264. doi:10.1139/z99-089.
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- C. Jared, M. M. Antoniazzi, I. S. Sano-Martins & A. Brunner Jr. (1995). "Ultrastructural cytology of maturing erythroid cells in a fossorial reptile (Amphisbaena alba) with reference to hemoglobin biosynthesis". Comparative Biochemistry and Physiology Part A: Physiology 112 (3–4): 487–494. doi:10.1016/0300-9629(95)02017-9.
- D. D. Spadacci-Morena, C. Jared, M. M. Antoniazzi, O. Brunner, P. Morena & A. Brunner Jr (1998). "Comparative cytomorphology of maturing amphisbaenian (Amphisbaena alba) and snake (Waglerophis merremii) erythroid cells with regard to haemoglobin biosynthesis". Comparative Haematology International 8 (1): 7–15. doi:10.1007/BF02628098.
- Carlos Jared, Marta Marta Antoniazzi, Edna Freymüller & Luiz Carlos Uchôa Junquerira (1998). "A possible advantage of displaying the tail: a comparison between the tail and body integument structure in Amphisbaena alba and Leposternon microcephalum (Squamata, Amphisbaenia)". Annales des Sciences Naturelles – Zoologie et Biologie Animale 19 (2): 89–97. doi:10.1016/S0003-4339(98)80003-8.
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- Linnaeus, C. 1758. Systema naturae per regna tria naturae, secundum clases, ordines, genera, species, cum characteribus, diferentiis, synonymis, locis. Tomus I. Editio Decima, Reformata. Stockholm: L. Salvius. 824 pp. (Amphisbæna alba, p. 229.)