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General Description

Description: Small erect sponge attached on a minute solid substratum by an enlarged base 2-3 mm in diameter, forming a slender, flattened spicular axis with numerous lateral filaments or processes, frequently with a bud-like larger branching process. The holotype has a total length of 40 mm, with a lateral bud and filaments 1.4 mm in maximum length. The filaments are regularly arranged perpendicularly in two lateral rows along the axis, with a spacing of 0.3-0.6 mm, alternating on each side. The bud-like processes are perpendicular or slightly oblique to the main axis, with a few short lateral processes on their axis and are thickened at the end. There is no visible aquiferous system. The sponge is yellowish grey to clear brown in colour.

Skeleton: The main axis of the large fusiform styles are longitudinally arranged and spirally twisted in the basal portion where the axis is lined by substrongyles. The axis of the filaments are slightly conical at the base, with the styles anchored by their head and the point outwardly directed, entirely crossing the stem, and reduced to one or two styles near their end. The living tissue was poorly preserved, but contained numerous sigmancistra. The best preserved zones of the stem and the base of the filaments have a continuous lining of isochelae, generally with the alae outwardly directed and the shaft lying parallel on the axis.

Spicules: The styles or substrongyles of the main axis are straight, the larger ones strongly fusiform with a blunt tip nearly similar to the head. Size 700-1600 x 10-37 um.

The styles of the lateral branches are straight, the larger ones slightly fusiform, with a short acerate point. Size 330-1000 x 5-15 um.

The styles, substrongyles or strongyles from the base and from the coating of the main axis are very variable in size. The smaller ones are located at the fixation base and are slightly curved, sometimes with a double bend, and have equal ends. The larger ones are located along the basal part of the axis, often a little flexuous, fusiform and with unequal ends. Size 30-825 x 8-30 um.

The abyssochelae have a curved shaft ca. 5 um in diameter. The frontal ala is roughly parallelepipedal, long and nearly in contact with the opposite frontal ala, with a broadly quadrangular section that is abruptly cut at the end. The lateral ala is large, linked to the shaft along almost their entire length. Size 48-72 um, most are between 60-65 um.

The sigmancistra 1 have a slightly enlarged shaft. Size 15-19 um.

The sigmancistra 2 are very abundant and without a notch. Size 5-8 um.

(Vacelet, 2006).


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