Fig. 2. Amphiuma tridactylum = three-toed amphiuma (Amphiuma tridactylum)
Fig. 1. Amphiuma didactylum = two-toed amphiuma (Amphiuma means)

Français : Descriptiones et icones amphibiorum. Auctor Dr. Joannes Wagler
English: Drawings of Amphiuma means (two-toed amphiuma) on bottom and Amphiuma tridactylum (three-toed amphiuma) on top by Johann Wagler
Date [1828-]1833.
Source https://www.flickr.com/photos/biodivlibrary/19277946523
Author Johann Wagler
Source: https://commons.wikimedia.org/wiki/File%3ADescriptiones_et_icones_amphibiorum_%2819277946523%29.jpg


Fig. 2. Amphiuma tridactylum = three-toed amphiuma (Amphiuma tridactylum)

The three-toed amphiuma (Amphiuma tridactylum) is a species of aquatic salamander native to the Southeastern United States. The three-toed amphiuma looks rather eel-like, with an elongate, dark gray-black, or brown colored body, and tiny vestigial legs. They have small, lidless eyes, and gill slits. They have four tiny legs each with three toes and an average of 62 costal grooves.

Order: Urodela
Family: Amphiumidae
Genus: Amphiuma
Species: Amphiuma tridactylum Cuvier, 1827
Synonyms
- Syren quadrapeda Custis, 1807
- Muraenopsis tridactyla (Cuvier, 1843)


Fig. 1. Amphiuma didactylum = two-toed amphiuma (Amphiuma means)

The two-toed amphiuma (Amphiuma means) is an aquatic salamander widely distributed in the southeastern United States. It is commonly, but incorrectly, called "congo snake", "conger eel" or the "blind eel". Two-toed amphiumas are some of the largest extant amphibians in the world. They have four vestigial legs that end in two toes; the number of toes is one of the primary differences between Amphiuma means and its relatives, the one-toed and three-toed amphiumas.

Order: Urodela
Family: Amphiumidae
Genus: Amphiuma
Species: Amphiuma means Garden in Smith, 1821
Synonyms
- Sireni simile Smith, 1821
- Axolotus lacertinus Jarocki, 1822
- Chrysodonta larvaeformis Mitchill, 1822
- Amphiuma didactylum Cuvier, 1827
- Sirenoides didactylum (Cuvier, 1827)