Cladaster rudis Verrill 1899
- Dataset
- New species, occurrence records and observations of predation by deep-sea Asteroidea (Echinodermata) from the North Atlantic by NOAA ship Okeanos Explorer
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Echinodermata
- class
- Asteroidea
- order
- Valvatida
- family
- Goniasteridae
- genus
- Cladaster
- species
- Cladaster rudis
biology_ecology
Feeding Observations On three of the four observations that this species was observed, it was positioned vertically on a small branched Lophelia colony upon which it was apparently feeding (Fig. 8 A). Polyps from the colony were withdrawn with most of the colony seemingly lifeless. One of the Stetson Mesa West observations observed a Cladaster present on a laterally positioned Lophelia colony with its disk and arms arched around it. This represents the first in situ feeding observation of Cladaster rudis.
description
Figure 8 A – D
discussion
Images Examined Stetson Mesa North, North Atlantic 30.40337, - 79.59817, 787 m. EX 1806 _ IMG _ 20180620 T 151009 Z _ ROVHD. jpg Stetson Mesa West 29.859987, - 79.455657, 767 m. EX 1907 _ IMG _ 20191103 T 205656 Z _ ROVHD. jpg Stetson Mesa West 29.861274, - 79.45494, 785 m. EX 1907 _ IMG _ 20191103 T 185505 Z _ ROVHD. jpg
discussion
This species was identified based on its triangular arms and coarse granules covering the abactinal and marginal plate surfaces, superomarginals abutted over the mid radius on each arm, the large single subambulacral spine and the pedicellariae type present on the actinal surface. The sample collected was obtained from a region near the type locality and was morphologically very similar in terms of the abactinal and marginal surface granulation and plate and arm plate morphology. The specimen had much rounder granules on the actinal surface versus the holotype which had more pointed and conical granules on the surface. Pedicellariae also seemed to be more abundant on the specimen mentioned herein.
distribution
Occurrence: Off Florida, Stetson Mesa North and West, Blake Plateau, Yucatan Channel. 150 – 900 m.
materials_examined
Material Examined USNM 1607547 Stetson Mesa Mound Field One, 30.399, - 79.2757, 824 m, Coll. ROV Deep Discoverer, NOAA Ship Okeanos Explorer, EX 1907. 4 Nov. 2019. 1 wet spec. R = 1.9 r = 1.0. EX 1907 _ IMG _ 20191104 T 175744 Z _ ROVHD. jpg
Name
- Homonyms
- Cladaster rudis Verrill 1899