* Echinoneus cyclostomus Leske, 1778

Fig. 52 A–D.

Echinoneus elegans: A. Agassiz, 1863: 25 .

Echinoneus cyclostomus: Alcock & Anderson, 1894: 194; H.L. Clark, 1925a: 177. Pl. X, Figs 1–3; Mortensen, 1948d: 75 –80. Pl. I, Figs 14, 26. Pl. XII, Figs 21, 23; Schultz, 2010: 287, Figs 549–550; Filander & Griffiths, 2014: 54 –55. Pl. II, Fig. E.

Material examined. SAMC-A28221; SAMC-A28212; SAMC-A28225; SAMC-A28234.

Identification. Test elongated, slightly doomed aborally, orally concave. Ambulacra pore zones narrow—not forming petaloid, conspicuous glassy knobs aborally. Peristome triangular shaped, centrally positioned. Denuded test light brown. Spines short, brownish, uniform.

Global maximum size. Maximum test length 50 mm.

Global distribution. Atlantic Ocean, from Caribbean to Brazil and Tropical West Africa; also Indo-Pacific, from east coast of South Africa (Filander & Griffiths 2014) to Hawaii and Easter Islands and from Japan to northern Australia and Lord Howe Island; littoral to 570 m (Mortensen 1948d; Schultz 2010).

Remarks. There used to be two species in this genus. The second species— Echinoneus abnormalis, was moved to its own genus ( Koehleraster) based on absence of glassy tubercles and perforated tubercles (Schultz 2010).