Comprehensive Description

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General Description

The disk is high and bulging, with a disk diameter of 4.5 mm and short robust spines with wide multifid crown, 0.22 mm long, that partially obscures the disk scales, viviparous. The scales are round, imbricating, and largely cover the radial shields. The visible distal part is about the same size as the disk scales, with a twice as long bar-like part underlying the scales. The pairs are widely separated by a wedge of scales. There were five broken arms that were at least 3 times the disk diameter in length, strongly noded, and having five rough spines do not quite forming a fan above the proximal arm. The uppermost spine is as long as 1.5 segments, and ventral most spine is half as long. On distal segments, from the sixth segment on there are three spines, the ventral most of which is hook-shaped. The dorsal arm plate is fan-shaped, and has a convex distal edge, an acute proximal angle, and straight lateral edges that are twice as wide as they are long. The adjacent plates are widely separate. The lateral arm plates meet both dorsally and ventrally, with a pronounced articulation ridge.

The ventral disk has round imbricating scales, with those at the disk edge bearing spines. One interradius was ruptured, two others had emerging young, which appear to be breaking through the disk wall rather than crawling out of the bursal slits. The apical papilla is pointed and larger than the oral papillae. There are three to four spine-like to rounded oral papillae along each jaw edge, the distal most one being smaller than others. The oral shield is twice as wide as it is long, with wing-like lateral sides, a pointed proximal angle, and a convex distal edge. The adoral shields are almost as wide as the oral shield, and curve along the proximal edges of the oral shield, with a strongly convex, nearly angular, distal edge. The proximal edge is weakly concave and meets above, not curving around, the lateral angles of the oral shield. The oral and adoral shields have a glassy beaded structure. The ventral arm plates are twice as wide as they are long, and are almost rectangular in shape. They have a wide obtuse proximal angle, a straight distal edge, and concave lateral edges that are widely separate from each other. There is a single pointed oval tentacle scale.

(Stohr & Segonzac, 2005)


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