WThe harlequin catshark is a species of finback catshark, part of the family Proscylliidae, and the only member of the genus Ctenacis. This shark is found in the western Indian Ocean off the coast of Somalia, at depths between 70 and 170 m. The 46 cm holotype was the only specimen that was ever found.
WThe quagga catshark is a species of catshark, belonging to the family Scyliorhinidae. A small, slim-bodied shark reaching 37 cm (15 in) in length, it has a distinctive color pattern of narrow, dark brown vertical bars, which resemble those of the quagga. Its head is short and flattened, with a pointed snout tip that is not upturned.
WThe smallbelly catshark is a catshark of the family Scyliorhinidae found in the western Indian Ocean near Somalia, the Gulf of Aden, and Oman, at depths between 1,300 and 1,840 m. Its length is up to 34 cm, although this measurement is of an immature specimen. The smallbelly catshark is not well known. It is found on continental slopes, and is probably caught by bottom trawlers. The reproduction of the smallbelly catshark is oviparous.
WThe speckled catshark is a catshark of the family Scyliorhinidae. It is found in the Gulf of Aden and off the coast of Somalia. It occurs at depths of between 37 and 250 m. Its length is up to 48 cm.
WPhreatichthys andruzzii, a species of cyprinid fish, is the only species of the genus Phreatichthys, and is endemic to Somalia. This cave-adapted fish is whitish and blind. It is considered to have evolved in the cave environment for some two million years. Its name derives from the Greek words phreasatos for spring, and ichthys for fish. It grows to a maximum length of 6.2 cm (2.4 in).
WSecutor insidiator, the barred ponyfish or pugnose ponyfish, is a species of bony fish in the slipmouths family. The barred ponyfish's mineralized skeleton contains apatite and the mineralized tissue contains hydroxylapatite. They have bare heads with nuchal spines and their bodies are a distinctive, reflective silver, frequently imitated by fishermen using silver lures. They have a protracted mouth pointing upward and the tip of the maxilla reaches well below the level of the lower margin of the eye. Barred ponyfish feed on zooplankton, including larval fishes and crustaceans. Body depth is twice or slightly more than standard length, which measures 11.3 cm from the tip of the snout to last vertebra. The lateral line ends before the dorsal fin.
WSynodontis frontosus, known as the Sudan squeaker, is a species of upside-down catfish that is widely distributed throughout northern and central Africa. It has been reported in Chad, Democratic Republic of the Congo, Ethiopia, Kenya, Somalia, Sudan, and Uganda. It was first described by French zoologist Léon Vaillant in 1895, from specimens collected in the White Nile in Sudan. The species name frontosus is Latin, and means "broad head".
WSynodontis geledensis, known as the Geledi squeaker, is a species of upside-down catfish that is native to Ethiopia, Kenya and Somalia where it can be found in the Lorian Swamp, the Shebelle and Ewaso Ng'iro rivers. It was first described by German zoologist Albert Günther in 1896, from specimens obtained near Geledi, on the Shebeli River in east Africa. The species name geledensis comes from Geledi, Somalia, the location where the first specimens were first found.