Saccocamera ampulla, Grischenko & Gordon & Melnik, 2018

Grischenko, Andrei V., Gordon, Dennis P. & Melnik, Viacheslav P., 2018, Bryozoa (Cyclostomata and Ctenostomata) from polymetallic nodules in the Russian exploration area, Clarion - Clipperton Fracture Zone, eastern Pacific Ocean-taxon novelty and implications of mining, Zootaxa 4484 (1), pp. 1-91: 33-34

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Saccocamera ampulla

n. sp.

Saccocamera ampulla   n. sp.

( Figs 19 View FIGURE 19 , 20 View FIGURE 20 )

Material examined. Holotype: ZIRAS 1/50709, colony attached to nodule particle, YMG R.V. Yuzhmorgeologiya cruise YMG4–14, Stn 359, 19 January 2016, 14.08687° N, 131.78558° W, 5122 m. One specimen only.

Etymology. Latin, ampulla   , bottle, flask, alluding to the shape of the gonozooid; used as a noun in apposition.

Description. Colony squat, tiny, on very short base showing alveoli around periphery, no surrounding lamina ( Fig. 19 View FIGURE 19 ), 1.72 × 1.51 mm, 1.39 mm high. Alveoli with uneven openings of various sizes; these surround incubation chamber in sole fertile colony. Colony center encircled by two whorls of autozooidal peristomes. Entire surface minutely granular-tubercular, some granules longer and minutely prickle-like ( Fig. 20F –J View FIGURE 20 ). Pores tiny, rare.

Autozooidal peristomes moderately long in uppermost whorl, shorter below, each with bumpy discontinuous longitudinal ridges, some barbed ( Fig. 20H View FIGURE 20 ). Apertures subcircular to oval with up to eight spines ( Fig. 20J, K View FIGURE 20 ), each representing distal extension of longitudinal ridge. Inner surface of peristome more or less smooth, lacking spinulation ( Fig. 20K View FIGURE 20 ).

Gonozooid single, prominent, saccular, highly convex, occupying almost entire center of colony ( Figs 19A –D View FIGURE 19 , 20A View FIGURE 20 ). Surface minutely prickly-granular ( Fig. 20C –E View FIGURE 20 ), lacking pores or surficial alveoli. Ooeciostome like neck of flask, narrowed but slightly flared at rim ( Fig. 20C, D View FIGURE 20 ), ooeciopore transversely oval ( Fig. 20E View FIGURE 20 ), inner surface slightly ridged and textured, but no spinulation.

Ancestrula and early astogeny not seen.

Measurements (mm). Holotype, ZIRAS 1/50709 ( Fig. 19A –D View FIGURE 19 ): ZL 0.353–0.653 (0.509 ± 0.108); PeL 0.268–0.563 (0.438 ± 0.102); PeD 0.170–0.203 (0.185 ± 0.012); ApL 0.148–0.201 (0.178 ± 0.016); ApW 0.121–0.155 (0.140 ± 0.012). Gonozooid (n = 1): GZL 0.718; GZW 0.674; GZH 0.379; OsL 0.063; OsW 0.196; OsH 0.183; OpL 0.131; OpW 0.159.

Remarks. The gonozooid of Saccocamera ampulla   n. sp. resembles that illustrated in Moyano’s (1991) line drawings of S. minima   in terms of its proportions and placement relative to the rest of the colony, but he illustrated a much smaller ooeciopore. Saccocamera minicamera   can have two calyces of autozooids per colony and the gonozooid is even more discrete, with no ooeciostome as such, just a wide ooeciopore. Saccocamera minutissima   , which has the smallest-known mature colony of any cyclostome (perhaps of any skeletonized bryozoan), has just five autozooidal peristomes surrounding a tiny chamber with a minute ooeciostome and ooeciopore.

Distribution. Recorded from a single station with coordinates 14.08687° N, 131.78558° W, at 5122 m depth.