Crustacea biodiversity in tubes of Ceriantharia (Cnidaria; Anthozoa), including the description of a novel species of Amphipoda from southeastern Brazil

Ceriello, Hellen; Senna, André R.; Andrade, Luiz F.; Stampar, Sérgio N.

doi:10.1080/17451000.2021.2020293

Cited by 1 publication

(1 citation statement)

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“…Ceriantharians are tube builder invertebrates; mostly, the tubes are described as flexible and soft structures that are built from combining filaments of ptychocysts and sediment or mud ( Child, 1908 ; Stampar et al, 2015a ). The tube is built in between the sediments ( Tiffon, 1987 ) and play the role of sheltering the ceriantharian, protecting it from predators ( Stampar et al, 2015a ), but it can also serve as refuge to other small marine invertebrates, such as Amphipoda ( Ceriello et al, 2021 ). The construction, length and shape of the tube by ceriantharians can be distinct and consists in relevant implications on the lifestyle.…”

Section: Discussionmentioning

confidence: 99%

Description and life cycle of a new species of the genus Arachnanthus (Cnidaria: Anthozoa: Ceriantharia) from the Southwestern Atlantic Ocean

Lopes

Scarabino

Carranza

et al. 2023

PeerJ

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Background Ceriantharia is a subclass of the phylum Cnidaria, which comprises tube-dwelling marine invertebrates. This subclass is composed of three families, including Arachnactidae, with two known genera. Currently, the genus Arachnanthus has five valid species recorded from Australia, the Mediterranean Sea and both the Southern and Northern Pacific Ocean. However, at the moment, there is no record of organisms of this family from the South Atlantic Ocean. Besides that, the life cycle of any species of the genus Arachnanthus is known. The present study describes a new species of the genus Arachnanthus and its life cycle, based on specimens from Uruguay and South of Brazil. Methods Larvae were collected by plankton net in Rio Grande—Brazil and the development and external morphology of these specimens were observed in the laboratory during two years, and subsequently described. Additionally, nine adult ceriantharians correspondent to the larvae from Rio Grande were collected in Uruguay and their external and internal anatomies, and cnidome were described. Results Arachnanthus errans sp. nov. exhibited a free-swimming, short-lived cerinula larvae that spent short-time on the plankton. The larva developed into small and translucent polyps with a short actinopharynx, one pair of mesenteries attached to a siphonoglyph, and a medium first pair of metamesenteries. Further, the adult polyp displayed an unprecedented locomotion behavior in Ceriantharia that is first reported here, it can crawl under and in between the sediment.

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