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Table 2 Comparison of generic-level characters within the family Isanthidae

From: A new genus and species of isanthid sea anemone (Cnidaria: Anthozoa: Actiniaria) from Chilean Patagonia, Anthoparactis fossii n. gen. et sp

Genus # M/# MP M fertile More mesenteries Siphonoglyphs/directives Mesogloeal sphincter Retractor muscles # Tentacles Cinclides Column surface Acontia Cnidome
Isanthus Carlgren, 1938 Not numerous/6 1st cycle (6 pairs) 0 2/2 Not strong Reniform Not numerous No Smooth No Spirocysts, basitrichs, microbasic p-amastigophores
Paraisanthus Sanamyan and Sanamyan, 1998 24–48/6 1st cicle (6 pairs) Distally 2/2 Well developed Strongly restricted, reniform or almost circumscribed 48–74 In longitudinal rows Smooth No Spirocysts, basitrichs, p-amastigophores, holotrichs
Zaolutus Hand, 1955 Usually 48 in mid column/≤ 12 Up to 2nd cycle (12 pairs) Distally 2/2 Two sphincters Restricted, those of directives sometimes reniform Numerous (up to 6 cycles) No Smooth or with microscopic papillae No Spirocysts, basitrichs, microbasic p-amastigophores
Austroneophellia Zamponi, 1978 24/12 ? ? 2/2 Palmate circumscribed Circumscribed >50 No Smooth No Spirocysts,
microbasic b-mastigophores, microbasic p-mastigophores
Eltaninactis Dunn, 1983 ≤ 12/6 1st cycle 6 pairs Equal or proximally Absent or indistinct/2 Weak Strong, circumscribed 24, 16 or 17 No Tenaculi and cuticle No Spirocysts, basitrichs, microbasic p-mastigophores
Isoparactis Stephenson, 1920 24 + incomplete cycle/6 1st cycle (6 pairs) Distally 2/2 Well developed Restricted to circumscribed Up to 110 Proximally or absent Adherent rugae/smooth Yes, with basitrichs and p-amastigophores Spirocysts, basitrichs, microbasic p-amastigophores
Anthoparactis n. gen. 48/6 1st cycle (6 pairs) 0 2/2 Well developed Circumscribed 48 No Adherent rugae Yes, with basitrichs only Spirocysts, basitrichs, microbasic p-amastigophores
  1. M pairs of mesenteries, MP pairs of perfect mesenteries; 0, same number of mesenteries proximally and distally; # number. Updated from Lauretta et al. (2013)