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Table 1 Mean and range of the length of the most variable helices within the three sponge classes

From: Molecular evolution of rDNA in early diverging Metazoa: First comparative analysis and phylogenetic application of complete SSU rRNA secondary structures in Porifera

  Calcarea (n = 48) Demospongiae (n = 109*) Hexactinellida (n = 5**)
Helix bp (range) bp (range) bp (range)
10 22.8 (21–26) 21.9 (20–30) 36.0 (35–37)
E10_1 55.4 (54–64) 61.6 (55–74) 75.4 (67–80)
43 49.1 (49–50) 49.5 (48–55) 91.5 (72–101)
  1. *Marine haplosclerids not included in Helix 43; **Farrea occa not included for helix 43.