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

publication ID

https://doi.org/ 10.11646/zootaxa.4121.1.1

publication LSID

lsid:zoobank.org:pub:2C978846-61DD-48BD-87BE-0BC22D0CABF2

DOI

https://doi.org/10.5281/zenodo.5058029

persistent identifier

https://treatment.plazi.org/id/03F40C7E-FFB9-293A-CCDB-FC10FAE4FD1D

treatment provided by

Plazi

scientific name

Bomba endeavourensis Kelly, Reiswig & Samaai
status

 

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

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

Latrunculia View in CoL sp. Austin & Ott 1996: 18.

Material examined. Holotype— RBCM 014-00120-001: Endeavour Ridge off British Columbia coast, Station A1448, 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. 11 View FIGURE 11 A, B), composed of tiny pigmented dots at the apex of each microsclere, visible under magnification ( Fig. 11 View FIGURE 11 B). A thick, dense, cross-hatch mesh of megascleres forms the leathery casing of the sponge ( Fig. 11 View 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. 11 View FIGURE 11 C, D; Table 5 View TABLE 5 ), anisostyles, heads spined retrovertly (spines face away from head along shaft, flattened against shaft), spines low granular bumps in immature forms (Fig. 10D), 618 (362‒722) × 24 (17‒27) µm, n = 50.

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

Specimen Anisostyles Anisodiscorhabds
RBCM 014-00120-001 Holotype 618 (362‒722) × 24 (17‒27) 51 (36‒57) × 38 (29‒43)
RBCM 014-00120-002 Paratype 669 (602–708) x 23 (20–25) 47 (39–51) x 33 (29–37)
RBCM 014-00120-003 Paratype 666 (559–721) x 21 (18–25) 55 (43–61) x 37 (34–42)
RBCM 014-00120-004 Paratype 552 (508–585) x 21 (18–23) 50 (48–57) x 41 (36–45)
RBCM

Royal British Columbia Museum

Kingdom

Animalia

Phylum

Porifera

Class

Demospongiae

Order

Poecilosclerida

Family

Latrunculiidae

Genus

Bomba

Loc

Bomba endeavourensis Kelly, Reiswig & Samaai

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

Latrunculia

Austin 1996: 18
1996
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