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TABLE 3 in Taxonomic significance of test morphology in the echinoid genera Diadema Gray, 1825 and Echinothrix Peters, 1853 (Echinodermata)
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- 1. School of Biological Sciences, Queen Mary, University of London, Mile End Road, London E 1 4 NS (United Kingdom)
Description
TABLE 3. — Test measurements, proportions and features for Diadema savignyi Michelin, 1845 and D. setosum (Leske, 1778). Abbreviation: SD, standard deviation.
| D. savignyi | D. setosum | |
|---|---|---|
| Origin of specimens examined | Seychelles, Japan, New Cale- | Mauritius, Indonesia, Australia, |
| donia, Cook Islands, Samoa, Fiji | New Caledonia, Fiji, Philippines | |
| Test colour | black | black |
| Test shape | hemispherical | hemispherical |
| Test distinctions | ambulacra slightly raised aborally | ambulacra slightly raised aborally |
| Iridophore pattern (interambulacra) | blue lines (bold) | lines of blue spots |
| Iridophore pattern (apical system) | blue ring (bold) | no apical ring |
| Iridophore pattern (genital plate) | blue arch (bold) | blue spot of iridophores |
| Mean horizontal test diameter (SD) | 68 mm (4.2 mm) | 76 mm (3.7 mm) |
| Mean vertical test diameter (SD) | 38 mm (2.1 mm) | 40 mm (2.9 mm) |
| Maximum horizontal test diameter observed | 78 mm | 84 mm |
| Maximum vertical test diameter observed | 44 mm | 48 mm |
| Markings on test (median area of | white spot marking (typically | white spot marking (day and |
| interambulacra) | night only) | night) |
| Markings on naked test (median area of | geographic variation, white spot/ | white line and spot markings |
| interambulacra) | no spot | |
| Markings on naked test (genital plate) | distinct arched depression | green/blue spot marking |
| (typically) | ||
| Number of tubercles on genital plate | 1-3 tubercles | 3-5 tubercles |
| Height to width (at widest point) ratio of | 0.69:1 | 0.72:1 |
| genital plate | ||
| Diameter of gonopore (% of genital plate | 28% | 25% |
| height) | ||
| Form of apical system | hemicyclic | hemicyclic |
| Form of periproct (distinguishing features) | small black, no ring or platelets | small black, orange ring, no |
| platelets | ||
| Apical system (% of horizontal test diameter) | 22-28% | 22-28% |
| Periproct (% of horizontal test diameter) | 13-18% | 12-20% |
| Peristome (% of horizontal test diameter) | 42-50% | 40-50% |
| Ambulacra % of interambulacra (at ambitus) | 28-30% | 25-30% |
| Tubercle structure | perforate and crenulate | perforate and crenulate |
| Number of median series of tubercles on | variable (1 or 2) | variable (1 or 2) |
| interambulacra | ||
| Rudimentary tube feet present on the | no | no |
| peristome | ||
| Buccal tube feet present | 5 pairs | 5 pairs |
| Spines present on the buccal plates | no | no |
| Number of specimens examined | 200 | 200 |
Notes
Published as part of Coppard, Simon Edward & Campbell, Andrew C., 2006, Taxonomic significance of test morphology in the echinoid genera Diadema Gray, 1825 and Echinothrix Peters, 1853 (Echinodermata), pp. 110 in Zoosystema 28 (1) on page 110, DOI: 10.5281/zenodo.5401706
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- Is part of
- Journal article: 10.5281/zenodo.5401706 (DOI)
- Journal article: urn:lsid:plazi.org:pub:FFC7FFBA0706FFDAFFE6FFC2FF83AA13 (LSID)
- Journal article: http://publication.plazi.org/id/FFC7FFBA0706FFDAFFE6FFC2FF83AA13 (URL)