Urechinus naresianus A. Agassiz, 1879

Filander, Zoleka & Griffiths, Charles, 2017, Illustrated guide to the echinoid (Echinodermata: Echinoidea) fauna of South Africa, Zootaxa 4296 (1), pp. 1-72 : 56

Urechinus naresianus A. Agassiz, 1879

Fig. 64 A–D.

Urechinus naresianus: A. Agassiz, 1879: 80 ; A. Agassiz, 1881: 146 –148. Pl. XXIX, Figs 1–4 . Pl. XXX, Figs 10–14 . Pl. XXXIX, Figs 29–30 . Pl. XL, Figs 56–58 ; Bell, 1904: 173; H.L Clark, 1923 *: 398; H.L. Clark, 1924: 12; H.L. Clark, 1925a: 186 –187; Mortensen, 1950: 11 –113; Clark & Courtman-Stock, 1976: 245; Schultz, 2010: 590, Figs 1011–1013.

Material examined. MBC-A 022278; MBC-A 022279; MBC-A 022280; MBC-A 022281; MBC-A 022282; MBC- A 022283; MBC-A 022299; MBC-A 022300; MBC-A 022301.

Identification. Test oval; tapering posteriorly to blunt end, sunken towards peristome. Interambulacra V slightly inflated, hood above periproct. Sub-anal fasciole conspicuous in juveniles, less so in adults.

Global maximum size. Maximum test length 50 mm.

Global distribution. West coast of South Africa, Atlantic, sub-Antarctic and North Pacific, at 770–4400 m depth ( Schultz 2010).

Remarks. Differs from Pourtalesia alcocki in lacking the distinctive keel running along the upper side and hook above periproct. The labrum and sternal plates of U. naresianus are not separated, as in P. alcocki .

Figures

FIGURE 1. Detail of regular echinoid: upper (Stomopneustes variolaris) and lower (Stereocidaris excavata) side, showing terminology of various body parts.

FIGURE 2. Body plan of an irregular echinoid or sand dollar (Clypeaster rarispinus), showing terminology of various body parts.

FIGURE 3. The body plan of an irregular echinoids or heart urchin (Echinocardium cordatum), showing terminology of different body parts.

FIGURE 4. Tubercle types: A. perforated and non-crenulated (Stereocidaris alcocki). B. non-perforated and non-crenulated (Stomopneustes variolaris). C. perforated and crenulated (Chaetodiadema africanum).

FIGURE 10. Stereocidaris alcocki (SAMC-A 28229): A. Map showing distribution. B. Side view (close-up) of preserved specimen. C. Apical system of preserved specimen.

FIGURE 11. Stereocidaris capensis (MB-A 077743): A. Map showing distribution. B. Side view of preserved specimen. C. Close-up apical system of preserved specimen.

FIGURE 12. Stereocidaris excavata (SAMC-A 23320). A. Map showing distribution. B. Side view of preserved specimen. C. Close-up apical system of preserved specimen.

FIGURE 13. Stereocidaris squamosa (MBC-A 077750). A. Map showing distribution. B. Side view of preserved specimen. C. Close-up apical system of preserved specimen.

FIGURE 14. Acanthocidaris maculicollis (SAMC- A 28233). A. Map showing distribution. B. Spine close-up view of preserved specimen.

FIGURE 29. Echinothrix calamaris. A. Map showing distribution. B. Live specimen (KwaZulu-Natal). C. Aboral view of preserved specimen (MBC- 077783).

FIGURE 30. Caenopedina capensis (MBC-A 022218). A. Map showing distribution. B. Aboral view of preserved specimen.

FIGURE 56. Clypeaster eurychorius (SAMC-A 23306). A. Map showing distribution. B. Aboral view of preserved specimen. C. Oral view of preserved specimen. D. Side view of preserved specimen.

FIGURE 57. Clypeaster fervens (SAMC-A 28220). A. Map showing distribution. B. Aboral view of preserved specimen. C. Oral view of preserved specimen. D. Side view of preserved specimen.

FIGURE 58. Clypeaster rarispinus (SAMC-A 23307). A. Map showing distribution. B. Aboral view of preserved specimen. C. Side view of preserved specimen. D. Side view of preserved specimen.

FIGURE 64. Urechinus naresianus (SAMC-A 22281). A. Map showing distribution. B. Oral view of preserved specimen. C. Aboral view of preserved specimen. D. Side view of preserved specimen.