H.L. Clark, 1923 : 392
H.L. Clark, 1925a : 149
H.L. Clark, 1924 : 10
Clark & Courtman-Stock, 1976 : 241
Schultz, 2009 : 539
Mortensen, 1948d : 94
Illustrated guide to the echinoid (Echinodermata: Echinoidea) fauna of South Africa
Filander, Zoleka
Griffiths, Charles
Zootaxa
2017
4296
1
1
72
WDZR
H. L. Clark, 1925 c
H. L. Clark
1925
[151,661,1610,1636]
Echinoidea
Clypeasteridae
Clypeaster
Animalia
Clypeasteroida
49
50
Echinodermata
species
eurychorius
Clypeaster humulis: H.L. Clark, 1923: 392; H.L. Clark, 1925a: 149. Clypeaster eurychorius H.L. Clark, 1924: 10–11. Pl. III; Clark & Courtman-Stock, 1976: 241; Schultz, 2009: 539, Figs 913– 916. Clypeaster( Stolonclypus) eurychorius: Mortensen, 1948d: 94–96. Pl. XXX, Fig. 2. Pl. XXXI, Figs 2, 3. Pl. XXXII, Fig. 3. Pl. XXXIII, Fig. 2.
Material examined.MBC-A 022261; MBC-A 022286; MBC-A 022290; MBC-A023306; A22330; A28431; A23092. Identification.Distinguished from other Clypeasterspecies within the region in having a rounded pentagonal test, flat except at elevated petal area, margin thick. Petals short, opened distally, pore-zones narrow, interporiferous zones wider. Primary tubercles sparse, miliaries smaller than primaries. Primary spines small, slender, longer towards mouth; miliaries slender, with thick tip. Preserved specimens brownish-green; denuded test uniformly yellowish-white.
Global maximum size.Maximum test length 145 mm. Global distribution.South and East coast regions of South Africa, northward to Pemba Strait (Tanzania) and off Mauritius, at 125–320 mdepth ( Mortensen 1948d; Schultz 2009).
Remarks.Deep-water species, burrows in uppermost layer of sediment, where it feeds on organic particles.