Table 6. Comparison of number of described species in selected taxa between present study and a previous study of Nishimura (1981) [19].
| Taxon | NDS1 of previous study [19] | NDS of present study | Increase of NDS2 | ||
| Phylum | Class | Order | |||
| Chordata | Pisces | 2700 | 3790 | 1090 | |
| Cnidaria | Hydrozoa | 315 | 523 | 208 | |
| Chordata | Ascidiacea | 281 | 313 | 32 | |
| Echinodermata | Ophiuroidea | ca. 260 | 308 | 48 | |
| Echinodermata | Echinoidea | 192 | 161 | −31 | |
| Echinodermata | Asteroidea | 167 | 280 | 113 | |
| Platyhelminthes | Polycladida | Polycladida | 149 | 150 | 1 |
| Porifera | Calcarea | 130 | 130 | 0 | |
| Mollusca | Cephalopoda | 125 | 204 | 79 | |
| Arthropoda | Pycnogonida | 67 | 153 | 86 | |
| Sipuncula | 58 | 47 | −11 | ||
| Arthropoda | Crustacea | Amphipoda | 57 | 544 | 487 |
| Mollusca | Polyplacophora | 56 | 129 | 73 | |
| Brachiopoda | 55 | 73 | 18 | ||
| Arthropoda | Crustacea | Stomatopoda | 41 | 56 | 15 |
| Cnidaria | Scyphozoa | 38 | 37 | −1 | |
| Echiura | 17 | 21 | 4 |
1
Number of described species.
2
Difference between NDS reported in Nishimura (1981) [19] and NDS of the present study.