IUCN threat status:

Not evaluated

Comprehensive Description

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General Description

Description: Two small erect sponges, consisting of a somewhat flattened axis 4 cm high and 0.8-1 mm in diameter. The basal quarter is smooth, then with a biserially arranged lateral filaments arising perpendicularly to the axis in two opposite series. The filaments are frequently broken, up to 5 mm long, cylindrical and between 1-1.5 mm diameter at the base. The filaments are abruptly reduced to a thin spicular axis at ca. 0.7 mm from the axis. No aperture or aquiferous system is visible. Specimens preserved in alcohol are brown in colour.

Skeleton: The main axis of large fusiform styles longitudinally arranged, and are surrounded by a dense feltwork of small acanthotylostrongyles including sediment and skeletons of radiolarians and foraminiferans. The axis of the lateral filamnets is made up of smaller styles, with a similar feltwork of acanthotylostrongyles and sediment in the thickened base. The fixation base has a covering of thick, more or less flexuous styles or substrongles tangentially arranged. The microscleres are very abundant in the tissue of the stem and branches.

Spicules: The styles of the axis are straight, fusiform and with a blunt point. Size 1550-2100 x 30-35 um.

The styles (mycalostyles) of the axis of the latral filaments are straight, moderately fusiform, with an oval head and a short, acerate tip. Size 370-780 x 8.5-17 um.

The styles or substrongyles are found only at the fixation base. They are generally curved or more or less flexuous, sometimes vermiform, thicker in the middle with unequal ends. Size 220-535 x 15-42 um.

The acanthotylostrongyles form a feltwork around the main axis and the base of the filaments. They are straight or more often curved near the head and entirely covered by small spines that are curved toward the end near the head and curved towards the head near the end. The head is roundish, with an abruptly cut end. Size 65-165 x 0.8-2.3 um.

The anisochelae 1 have a head with a large lateral alae attached to the shaft along approximately two-thirds of their length. The frontal ala is large and ovoid. The shaft is feebly curbed in the first part, then bears two small fimbriae near the foot. The foot has two small diverging alae. Size 32-36 um, shaft diameter 4.1-5 mm.

The anisochelae 2 have a head with large lateral that are alae attached to the shaft along their whole length. The shaft has a free part which is short, curved and bearing two small rectangular alae in the first part, and then strongly bent with a large ovoid ala ending in a short point. Size 9.8-10.5 um, shaft diameter 08-1 um.

The sigmancistras have 90° twisting and acerate points, without a notch. Size 23-28 um, 2.3 um in maximum width.

(Vacelet, 2006).

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