Skip to main content

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)