Bomba endeavourensis Kelly, Reiswig & Samaai,

Kelly, Michelle, Sim-Smith, Carina, Stone, Robert, Reiswig, Toufiek Samaai Henry & Austin, William, 2016, New taxa and arrangements within the family Latrunculiidae (Demospongiae, Poecilosclerida), Zootaxa 4121 (1), pp. 1-48: 29-31

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Bomba endeavourensis Kelly, Reiswig & Samaai


Bomba endeavourensis Kelly, Reiswig & Samaai  gen. et sp. nov.

( Fig. 2View FIGURE 2 A, 11; Tables 5, 8, 9)

Latrunculia  sp. Austin & Ott 1996: 18.

Material examined. Holotype— RBCM 014-00120-001: Endeavour Ridge off British Columbia coast, Station A 1448, 47.7 ° N, 129.217 ° W, 2500 m, 4 Aug 1984, collected by V. Tunnicliffe. Paratypes — RBCM 014-00120- 0 0 2, RBCM 014-00120-003, RBCM 014-00120-004, same location data.

Type location. Endeavour Ridge, British Columbia, Canada, part of a hydrothermally and seismically active area near the Juan de Fuca and Pacific tectonic plates offshore British Columbia, Canada.

Distribution. Endeavour Ridge.

Description. Tiny, low-lying, hemispherical sponges, ranging in diameter from 4–12 mm, with 2–3 long ‘horns’ arising from deep within the choanosome, projecting well beyond the surface. The choanosome of each sponge is either fully or partially detached; the sponges appear as hollow, leathery casings. Large stiff bundles of spicules protrude well beyond the surface of the sponge, forming large, conical, horn-like projections, 1–2 mm high. No oscules obvious. Colour in preservative is translucent white, mottled with reddish brown patches ( Fig. 11View FIGURE 11 A, B), composed of tiny pigmented dots at the apex of each microsclere, visible under magnification ( Fig. 11View FIGURE 11 B). A thick, dense, cross-hatch mesh of megascleres forms the leathery casing of the sponge ( Fig. 11View FIGURE 11 B).

Skeleton. Crust-like ectosome, 238 (137–414) µm thick, composed of a tangential, cross-hatched layer of megascleres on top of which is a patchy palisade of erect anisodiscorhabds. Thick, solid, compact bundles of megascleres emerge from within the choanosome, traverse the ectosome and project from the upper and lateral surfaces. Bundles are shaped like tapered horns, 2–4 ‘horns’ per specimen. Horns range in length from 1‒4 mm, and taper from 2‒7 mm at base, to a rounded point. The ectosomal crust curves up the outside of each horn for a short distance.

Spicules. Megascleres ( Fig. 11View FIGURE 11 C, D; Table 5), anisostyles, heads spined retrovertly (spines face away from head along shaft, flattened against shaft), spines low granular bumps in immature forms (Fig. 10 D), 618 (362‒722) × 24 (17‒27) µm, n = 50.

Microscleres ( Fig. 11View FIGURE 11 E –G; Table 5), anisodiscorhabds with a basal whorl, a median whorl and an apical whorl, 51 (36‒57) × 38 (29‒43) µm, n = 50 ( Fig. 11View FIGURE 11 F).

Substrate, depth range and ecology. Rocky substrate, 2500 m.

Etymology. Named for the type location, Endeavour Ridge, off the coast of British Columbia, Canada.

Remarks. Bomba endeavourensis  gen. et sp. nov. is highly unusual and unprecedented in the Latrunculiidae  , possessing protruding ‘horns’ of megascleres, a shell-like morphology, and three-whorled anisodiscorhabds.

TABLE 5. Spicule dimensions (µm) of Bomba endeavourensis gen. et sp. nov. Paratype data are from 10 spicule measurements each.

RBCM 014-00120-002 Paratype    
RBCM 014-00120-004 Paratype    

Royal British Columbia Museum














Bomba endeavourensis Kelly, Reiswig & Samaai

Kelly, Michelle, Sim-Smith, Carina, Stone, Robert, Reiswig, Toufiek Samaai Henry & Austin, William 2016


Austin 1996: 18