Caymanostella spinimarginata Belyaev 1974

• Main Authors: Dilman, Anna B., Minin, Kirill V., Petrov, Nikolay B.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Asteroidea; Velatida; Caymanostellidae; Caymanostella; Kamchatka
• Online Access: https://doi.org/10.5281/zenodo.5799397; http://treatment.plazi.org/id/039687A5DD449210356535D7AFC6FBDA

CAYMANOSTELLA CF. SPINIMARGINATA BELYAEV, 1974 Material examined KuramBio II expedition, RV Sonne , cruise SO250, St. 9, 19.08.2016, 43° 48.439’– 43° 47.643’ N; 151° 44.351’– 151° 44.513’ E, depth 5101–5134 m, slope of the Kuril-Kamchatka Trench. Three specimens that were collected from sunken wood fragments. Senckenberg Research Institute and Natural History Museum, Frankfurt, field ID KB2 121. Description Specimen № 1 (voucher CsSO250-9-1) (Fig. 2G, H). Body subpentagonal, one ray is distinctly longer than the others and bent to the oral side. Colour in life and in alcohol is white. R = с. 5.3–6.7 mm (the longest ray is 8 mm), r = c. 5–5.7 mm. Abactinal plates are fan-shaped. They imbricate uniformly towards the centre of the disc. Abactinal plates are similar in size, only five enlarged primary inter-radial plates are distinguishable. One of the primary inter-radial plates bears a simple madreporite, which has the appearance of several branching grooves surrounded by a few nodules (Fig. 3D). Carinal rows are not discernible. At the tip of each arm, there is a terminal plate with a central opening. An unpaired terminal tube foot, possibly a sensory organ, is visible inside three of the five openings. Anal opening is central in position. Marginal plates are arranged in two parallel rows along the body margin, peripheral to the abactinal plates. These plates are narrow and oriented perpendicularly or slightly obliquely to the body margin. There are 11 superomarginal and 11 inferomarginal plates along each side of the arm. The inter-radial-most superomarginal plates (two per inter-radius) are conspicuously larger in size compared with the adjacent superomarginals, and have notches for the gonopores on the upper margins (Fig. 2G). More distally superomarginal plates gradually decrease in size towards the arm tip. Each inferomarginal plate bears on its outer edge two to three elongated fringe spines. These spines are 0.38–0.6 mm long and finely serrated. They are slightly compressed laterally, club-shaped in aboral ...