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Your search keyword '"Echinodermata"' showing total 4 results
4 results on '"Echinodermata"'

1. A new species of Ophioconis (Echinodermata: Ophiuroidea) from Ryukyu Islands, southwestern Japan.

Author

Masanori Okanishi and Yoshihisa Fujita

Subjects
*ECHINODERMATA, *OPHIUROIDEA, *HYALINE membrane disease, *TAXONOMY
Abstract

Ophioconis claviculata sp. nov. is described on the basis of three specimens collected from Ryukyu Islands, southwestern, Japan. The new species is distinct in having: disc covered by granules; four, sometimes five flat, polygonal oral papillae on each side of jaw; broad and flat teeth with hyaline distal end; spiniform and conical arm spines, two times longer than the corresponding arm segment at the maximum length; oralmost arm spines on proximal portion of arms flattened and clavate; four tentacle scales on third tentacle pore; and ventral arm plate longer than wide, with concentrate lamellar striations. The new species was found under rocks of open water as well as in a dark and medium to low salinity (28 ppt) environment of submarine cave, suggesting that this species tolerate this specific condition. [ABSTRACT FROM AUTHOR]

Published
2018
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2. Preliminary list of ophiuroids (Echinodermata: Ophiuroidea) collected from the Johor Straits, Singapore.

Author

Toshihiko Fujita and Seiichi Irimura

Subjects
*OPHIUROIDEA, *ECHINODERMATA, *MARINE invertebrates, *MARINE biodiversity
Abstract

Ophiuroids were collected during the Singapore Biodiversity Workshop at Pulau Ubin in 2012. About 520 specimens were provisionally identified and 22 species of ophiuroids recognised. Fourteen species are new to Singapore waters. [ABSTRACT FROM AUTHOR]

Published
2015

3. Large populations of two new species of Ophiambix (Echinodermata, Ophiuroidea) discovered on Japanese hot vents and cold seeps

Author

Okanishi, Masanori, Kato, Moe, Watanabe, Hiromi Kayama, Chen, Chong, and Fujita, Toshihiko

Subjects
new species, brittle star, Pacific Ocean, endemism, Animalia, Biodiversity, Ophiuridae, hydrothermal vent, Ophiuroidea, Ophiurida, Taxonomy, Echinodermata
Abstract

Okanishi, Masanori, Kato, Moe, Watanabe, Hiromi Kayama, Chen, Chong, Fujita, Toshihiko (2020): Large populations of two new species of Ophiambix (Echinodermata, Ophiuroidea) discovered on Japanese hot vents and cold seeps. Raffles Bulletin of Zoology 68: 196-213, DOI: 10.26107/RBZ-2020-0017

Published
2020

4. First finding of anchialine and submarine cave dwelling brittle stars from the Pacific Ocean, with descriptions of new species of Ophiolepis and Ophiozonella (Echinodermata: Ophiuroidea: Amphilepidida)

Author

Masanori Okanishi and Yoshihisa Fujita

Subjects
0106 biological sciences, 0301 basic medicine, Biology, 010603 evolutionary biology, 01 natural sciences, Pacific ocean, Ophiurida, 03 medical and health sciences, Paleontology, Cave, Japan, Brittle star, Ophiolepis, Animals, Animalia, Ophiolepididae, Ophiuroidea, Ecology, Evolution, Behavior and Systematics, Taxonomy, Islands, geography, geography.geographical_feature_category, Pacific Ocean, Submarine, Biodiversity, biology.organism_classification, Waves and shallow water, Stars, Caves, 030104 developmental biology, Ophiozonella, Animal Science and Zoology, Echinodermata
Abstract

Two new species, Ophiolepis cavitata n. sp. and Ophiozonella cavernalis n. sp., are described from the specimens collected in shallow water submarine caves in the Ryukyu Islands, southwestern Japan. Ophiolepis cavitata n. sp. is distinguished from the other congeners in having prominent tubercle-shaped knobs on dorsal arm plates; two sizes of disc scales on the aboral disc, the larger surrounded by 3–8 times smaller disc scales; larger scales concave; radial shields wider than long; a trio of distinct scales present distal to each pair of radial shields; oral shields partly concave; 3 arm spines on proximal portion of the arms. Ophiozonella cavernalis n. sp. is distinguished from the other congeners in having polygonal, uniform size disc scales; oral shields almost as long as wide, shallow concave proximal sides that end in a fairly sharp point medially; arms about 9 times longer than disc diameter; 3 cylindrical arm spines, of which the oral most one is slightly larger than other 2 spines. Ophiozonella cavernalis n. sp. is the second finding of an anchialine-endemic ophiuroid and the first finding from the Pacific Ocean.

Published
2018

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