Haswelliporina

Matsuyama, Kei, Janssen, Annika, Arbizu, Pedro Martínez, Martha, Silviu O. & Freiwald, André, 2014, Bryozoans from RV Sonne deep-sea cruises SO 167 ‘ Louisville’ and SO 205 ‘ Mangan’, Zootaxa 3856 (1), pp. 100-116 : 113

Haswelliporina ? quinaria, Gordon & d’Hondt, 1997

( Fig. 7 , G–H)

Material examined. SMF 15008, SO 167 Stn 104, 28.67317° S – 28.67217° S, 177.99733° W – 177.99150° W, South Fiji Basin, 3229–3528 m, collected 4 November 2002. Not bleached.

Description. Colony erect, comprising only 2 tiny, cylindrical stems in collection, each of alternating whorls of 3–4 zooids ( Fig. 7 , G). Frontal shield lepralioid, smooth, sparsely perforated with tiny pseudopores. Distinct, long tubular peristome ( Fig. 7 , H), with short, tubular spiramen at base of peristome mid-proximally. Tiny adventitious avicularia with complete cross-bar occur sparsely on frontal shield and side of peristome. Zooidal boundaries not visible. Fertile zooids not observed.

Measurements.

Stem diameter between peristomes 412–558 µm, σ = 53 µm, N = 5

Peristome height 337–551 µm, σ = 81 µm, N = 4; diameter 172–199 µm, σ = 12 µm, N = 4.

Remarks. The above description is based only on two tiny, 4-mm-long fragments. One of them was prepared for SEM but not bleached. Membranes and Fe-Mg-oxide crusts cover the surface, thus tiny structures like pseudopores and small avicularia are not all visible on the surface. Thus, the identification of this limited material as H. quinaria is tentative.

Figures

FIGURE 7. A – F, Hippothyris cf. aganactete Gordon, 1984. A, ancestrular area. B, two marginal zooids, one with a broken ooecium. C, marginal zooids with large Avicularia. D, close-up of a large avicularium. E, ooecium and partly concealed orifice. F, orifice with small avicularium. G – H, Haswelliporina? quinaria. G, stem fragment. H, autozooidal peristome. Scale bars: A, G, 1 mm; B, C, 300 Μm; D – F, H, 100 Μm.