Amphioplus 2722

F 82532, 82531.

Family - Amphiuridae.

Description

The disc is flat, 5 mm diameter. The radial shields are narrow, straight-sided, separated and parallel to one another, with 1 plates between them, with triangular plate separating part of the shields; 3 times long as wide, and length 0.23 times d.d. The dorsal surface is covered by plates, no spines/granules, with a visible diameter of 0.1–0.25 mm, overlapping; primary plates visible.

The ventral interradial surface is with skin-covered plates. The oral shields are exposed, teardrop, longer than wide. The adoral shields are exposed, extending to lateral edge of oral shield, separated radially, meeting interradially. Bursal slits extend from the oral shield to the disc margin, bordered by spines or papillae, blunt or rounded, as wide as long, usually contiguous. The jaw is as wide as long, with two, pointed or tapering apical papilla, as wide as long. Oral papillae separated by a gap from apical papillae, pointed. The oral tentacle pore is located inside the jaw, with distal oral papilla enlarged, and rounded.

The specimen has five arms, unbranched, moniliform, 5–7 times d.d. Dorsal arm plates, contiguous or separated, without spines/granules; fan-shaped, and 0.7–0.9 times long as wide. The second ventral arm plates are contiguous with the third plate, quadrangular or trapezoid, and 0.9–1.1 times long as wide. Ventral arm plates of the first free segments contiguous, quadrangular or trapezoid, and 0.9–1.1 times long as wide. Tentacle pores along the arm, with one scale, covering the pore, pointed. There are 1–2 arm spines on the first ventral segment, 3 on the first free segments. The spines are erect, extending laterally, subequal, and 1–1.5 times as long as one arm segment, blunt, cylindrical. Glassy rough shaft.

Description exported from Delta key and to be finalised when DNA sampling completed. Note species description and image characters may vary slightly in animals of different size within the same species.

Cite this publication as: "T O'Hara (2010). ‘Ophiuroids from deep sea southern Australia. Museum Victoria. Version: 1.0 http://www.museumvictoria.com.au/stars"
Information updated 5 February 2010

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