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Tenactis gen. nov. (Actiniaria, Haloclavidae) a new genus of sea anemones from the Gulf of California, Mexico

Published online by Cambridge University Press:  06 August 2018

Yamaly Barragán ,
Carlos Sánchez  and
Estefanía Rodríguez
Yamaly Barragán*
Affiliation:
Postgrado en Ciencias Marinas y Costeras (CIMACO), Universidad Autónoma de Baja California Sur, Carretera al Sur Km 5.5, 23080 La Paz, Baja California Sur, Mexico
Carlos Sánchez
Affiliation:
Departamento Académico de Ciencias Marinas y Costeras, Universidad Autónoma de Baja California Sur, Carretera al Sur Km 5.5, 23080 La Paz, Baja California Sur, Mexico
Estefanía Rodríguez
Affiliation:
Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA
*
Correspondence should be addressed to: Y. Barragán, Postgrado en Ciencias Marinas y Costeras (CIMACO), Universidad Autónoma de Baja California Sur, Carretera al Sur Km 5.5, 23080 La Paz, Baja California Sur, Mexico email: [email protected]
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Abstract

We describe and illustrate a new genus and species of sea anemone from the intertidal in the Gulf of California (Mexico). Tenactis gen. nov. is characterized by mesenteries decamerously arranged, a single pair of directives attached to a single and strong siphonoglyph, small conchula, endodermal marginal sphincter muscle, pedal disc with basilar muscles, cinclides in pedal disc and proximal column, column with verrucae and pseudoacrorhagi, and a cnidom with p-mastigophores A2 and p-mastigophores B1 and B2a. Tenactis riosmenai gen. et sp. nov. is characterized by having a column not divisible into regions with longitudinal rows of verrucae distally and pseudoacrorhagi forming spherical structures at the tip, only 10 pairs of perfect mesenteries, diffuse endodermal marginal sphincter muscle and p-mastigophores A2 and p-mastigophores B1 and B2a in the filaments. Because of the decamerous arrangement of the mesenteries Tenactis gen. nov. most closely resembles some members of Actiniidae, Haloclavidae, Minyadidae, Oractiidae and Limnactinidae (Actinioidea), Halcampidae (Metridioidea) and Halcuriidae (Actinernoidea). However, the combination of having a decamerous arrangement of mesenteries, single siphonoglyph, conchula and cinclides indicate this new genus belongs to Haloclavidae. Additionally, the presence of a diffuse endodermal marginal sphincter muscle, basilar muscles, a single pair of directives, column with longitudinal rows of verrucae distally and pseudoacrorhagi, p-mastigophores A2, and p-mastigophores B1 and B2a in the filaments distinguish Tenactis riosmenai gen. et sp. nov. within Haloclavidae. This is the first record of the family Haloclavidae for the Gulf of California.

Keywords

CnidariaintertidalAnthozoadecamerous arrangement
Type
Review
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 99 , Issue 3 , May 2019 , pp. 563 - 574
Copyright
Copyright © Marine Biological Association of the United Kingdom 2018 

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