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DescriptionApletodon dentatus is a small fish reaching up to 4 cm in length. It has a depressed triangular head when viewed from above. It has single dorsal and anal fins that are rounded in shape and short and are positioned near the tail. The tail itself is rounded, as is the pectoral fin. The pelvic fin is a specialised sucking disc. The small-headed clingfish is variable in colour, often green with darker mottling, or maroon spotted with mahogany, and large white dorsal spots. Adult males may display a large black or purple spot on the dorsal and anal fins and purple areas on the throat.The small-headed clingfish is very hard to distinguish from similar species other than by colouration, and can only usually be distinguished by the proportional sizes of it main exterior features (given by Whitehead et al., 1986).