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General Description

Description: Small pedunculate sponge consisting of a thin peduncle bearing an ovoid or subspherical body with dense spicular fascicles laterally radiating. The body measures between 3.5-1.5 mm, with the radiating fascicles up to 5 mm in length. The peduncle is between 25-28 mm long, without an attachment base, with a diameter of 0.3-0.5 mm and is made of longitudinally arranged long fusiform styles. The living tissue was poorly preserved, contains numerous microscleres. The radiating fascicles are made of fusiform styles and of smaller styles with the tip outwardly directed. The sponges are white in colour, with no visible aperture or aquiferous system, and no cortex.

Spicules: The styles of the radiating fascicles and of the peduncle are straight, with two ill-defined categories. In the peduncle the spicules are large and fusiform, with a rather blunt tip. In the body and radiating fascicles the spicules are smaller, less fusiform and with an acerate short tip. Styles of the peduncle type are also present in the body and radiating fascicles. Size 620-2500 x 7-35 um.

The arcuate isochelae have a curved shaft. The alae are ovoid, rather short. Size 80-170 um, shaft 8 um in diameter.

The abyssochelae have a strongly curved shaft. The front alae are long, nearly in contact with the opposite ala, laterally curved and abruptly cut at the end. The lateral alae are long and laterally curved. Size 40-45 um.

The anisochelae are moderately abundant and generally twisted with the plane of the two ends varying from a few degrees to 180°. The shaft is straight. One end is tridentate with the lateral alae cut away from the shaft. The frontal ala is bifid, and the other end has fused alae. Size 9.5-11 um.

The sigmancistra 1 are moderately abundant, most of them with the shaft laterally thickened in a lamella with a central depression. A few have the same shape as the sigmancistra 2 but are larger in size. Size 30-40 um.

The sigmancistra 2 are very abundant. They have a slightly contorted shaft, the large end with a notch. Size 9.5-12.5 um.

(Vacelet, 2006)


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