There are approximately 5 species and subspecies in this genus: N. gracilis · N. pellucida · N. radiatus · N. reticulata · N. senex
There are approximately 16 species and subspecies in this genus: R. abyssorum · R. abyssorum abyssorum · R. abyssorum arctica · R. abyssorum pacifica · R. abyssorum radiata · R. cornuta · R. cornuta cornuta · R. cornuta spiculotesta · R. discreta · R. discreta spiculosa · R. eocenica · R. irregularis · R. linearis · R. parabyssorum · R. scabra · R. triangularis
Accessed through GBIF Data Portal November 18, 2007:
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