Bomba tricincta ( Hentschel, 1929 ),

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: 31-33

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Bomba tricincta ( Hentschel, 1929 )

comb. nov.

Bomba tricincta ( Hentschel, 1929)  comb. nov.

( Fig. 12View FIGURE 12; Tables 6, 9)

Latrunculia tricincta Hentschel, 1929: 869  , 926, Pl. 12, Fig. 3View FIGURE 3.

Type Material. Holotype — ZMB Por 7851, Northern Norway, Station 8, 71.583 ° N, 26.9 ° E, 198 m, 3 Jul 1898, microscope slide annotated as “ Latrunculia  7851 tricincta, Hentschel  MS, Olga Expedition”.

Type location. Northern Norway.

Distribution. West Spitzbergen to Northern Norway, to Russia’s far northeast Kola Peninsula (Murmanküste), north of the Arctic Circle, and bordered by the Barents Sea.

Description. Hentschel (1929: 869) stated that the specimen he examined was a teased preparation from W. Weltner which precluded information on the shape and other details. The specimen was illustrated in Table 12, Fig. 3View FIGURE 3, stating that it was “at the natural size” (which was not given) and appears to be pedunculate with a collapsed apex and wrinkled stem ( Fig. 11View FIGURE 11 A). No information on the surface is given.

Skeleton. Hentschel (1929: 869) states that the skeleton is formed of strong, thick, bifurcating tracts about 80– 150 µm wide. Examination of small pieces of tissue on the microscope slide of the holotype reveal several large, robust tracts tapering from 100 to 350 µm wide, and 75 to 375 µm, splitting in two at the thicker end ( Fig. 12View FIGURE 12 B). Bundles of megascleres are also apparent, ranging in thickness from 50–100 µm.

Spicules. Megascleres ( Fig. 12View FIGURE 12 C –E; Table 6), anisostyles with smooth heads, shaft slightly sinuous, 603 (580‒635) × 10 (8‒10) µm.

Microscleres (Fig. F –G; Table 6), anisodiscorhabds, composed of three whorls of bifurcating or trifurcating spines. Under light-microscopy the basal, median and apical whorls are sharply spinose, not blunt as in B. endeavourensis  gen. et sp. nov., and all are bifurcate. The basal and median whorls appear to be orientated virtually perpendicular to the shaft whereas the apical whorl is oblique to the shaft and pointing forwards. No apex or manubrium is discernible even in the protorhabds. Development of the anisodiscorhabds is symmetrical, with spines developing straight from the shaft at both ends and in the middle (Fig. G), 46 (43‒50) × 35 (33‒38) µm.

Substrate, depth range and ecology. Fishery grounds, yellow sand with stones, 192 m ( Hentschel 1929).

Remarks. The microscope slide of Latrunculia tricincta  , kindly supplied by Dr Carsten Lüter, Museum für Naturkund Berlin, is thought to hold spicules from the holotype; no preserved specimen has been found despite thorough searching. Examination of the microscleres reveals that this is also a species of Bomba  gen. nov.; it has the same unusual microscleres with only basal, median and apical whorls. Hentschel (1929) noted that the possession of only three ‘girdles’ in L. tricincta  distinguished it from all species of Latrunculia  known at the time. The anisodiscorhabds of L. tricincta  are clearly of the same general form as those of B. endeavourensis  gen. et sp. nov.; they both possess three distinct whorls and lack a manubrium, subsidiary whorl and an apex. The anisodiscorhabds of B. tricincta  differs from those of B. endeavourensis  gen. et sp. nov., however, in the shorter length of the megascleres and the shorter length and smaller width of the anisodiscorhabds ( Table 5 and 6). The ornamentation of the anisodiscorhabds is also quite different, being sharply bifurcate spines in B. tricincta  . No further specimens have been recorded that we know of, thus, the genus is restricted to the north-eastern Pacific Ocean and North Atlantic Ocean above Norway.

TABLE 6. Spicule dimensions (µm) of Bomba tricincta (Hentschel, 1929) gen. nov.

ZMB Por 7851 Holotype 603 (580‒635) × 10 (8‒10) 46 (43‒50) × 35 (33‒38)

Museum für Naturkunde Berlin (Zoological Collections)














Bomba tricincta ( Hentschel, 1929 )

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

Latrunculia tricincta

Hentschel 1929: 869