Pourtalesia alcocki Koehler, 1914

Filander, Zoleka & Griffiths, Charles, 2017, Illustrated guide to the echinoid (Echinodermata: Echinoidea) fauna of South Africa, Zootaxa 4296 (1), pp. 1-72 : 55-56

Pourtalesia alcocki Koehler, 1914

Fig. 63 A–D.

Pourtalesia alcocki nov sp: Koehler, 1914: 8 –17. Pl. 1, Figs 1–14 , Pl. 16, Figs 1–15 . Pourtalesia carinata: Bell, 1904: 172 .

Pourtalesia alcocki: H.L. Clark, 1923: 399 . Pl. XIII; H.L. Clark, 1925a: 191; Mortensen, 1950: 146 –147; Clark & Courtman- Stock, 1976: 246; Schultz, 2009: 608, Figs 1042–1043.

Material examined. MBC-A 022229; MBC-A 022271; A22229 .

Identification. Easily identified by the unusual bottle shaped test and posterior rostrum.

Global maximum size. Maximum test length 50 mm.

Global distribution. Western Indian Ocean from Gulf of Oman to West coast of South Africa , at 1450–2380 m depth ( Schultz 2010).

Remarks. Inhabits deep-waters on continental slope, where feeds by burrowing through uppermost layer of substrate. Feeding occurs when the animal moves forward and detritus-rich sediment is pressed into the anterior groove ( Schultz 2009).

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 5. Histocidaris elegans (SAMC-A 22212): A. Side view of preserved specimen. B. Apical system of preserved specimen.

FIGURE 6. Eucidaris metularia (SAMC-A 28226): A. Map showing distribution. B. Side view of preserved specimen. C. Apical system of preserved specimen.

FIGURE 7. Kionocidaris striata (MBC-A 022213): A. Map showing distribution. B. Apical system of preserved specimen.

FIGURE 8. Phyllacanthus imperialis (SAMC-A 23447): A. Map showing distribution. B. Aboral view of preserved specimen.

FIGURE 9. Goniocidaris (Goniocidaris) indica: A. Map showing distribution. B. Aboral view of preserved specimen (SAMC- A 23089). C. Side view of preserved specimen (SAMC-A 28235).

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 15. Plococdaris verticillata (SAMC-A 28236). A. Map showing distribution. B. Side view of preserved specimen. C. Apical system of preserved specimen.

FIGURE 63. Pourtalesia alcocki (SAMC-A 22229). A. Map showing distribution. B. Lateral view of preserved specimen. C. Oral view of preserved specimen. D. Side view of preserved specimen.