Pyriporoides judyae, Branch & Hayward, 2005

Branch, M. L. & Hayward, P. J., 2005, New species of cheilostomatous Bryozoa from subantarctic Marion and Prince Edward Islands, Journal of Natural History 39 (29), pp. 2671-2704 : 2672-2675

Pyriporoides judyae sp. nov. ( Figure 2 )

Material Holotype: St. 53 Marion Island (46 ° 55 9 S, 37 ° 33 9 E), 600–775 m, on rock, SAM A27567.

Paratype: St. 53 Marion Island , SAM A27566 .

Description

Colony developing spreading, uniserial chains, encrusting on rock, each autozooid producing a single distal and paired lateral buds; with a cruciform branching pattern. Autozooids with proximal cauda 0.2–0.3 mm long; distal portion clavate, slightly tapering proximally, broadest halfway along the length of the cryptocyst; 0.5–0.7X 0.25–0.35 mm. Gymnocyst comprising half of total autozooidal length, continuous distally with slightly ridged, sloping lateral walls; frontal membrane bounded by a smooth, thickened, mural rim and underlain for a quarter of its length by a flat, granular cryptocyst; opesia elongate oval with a near-medial constriction. Six pointed spines spaced around the distal mural rim and five to six pairs of longer, lateral spines arching over the frontal membrane. Ovicell globose, elongate oval, smooth-surfaced, imperforate; a narrow, longitudinal area of endooecium exposed frontally, the edges of the ectooecium developing as a pronounced ridge; 0.17 mm longX 0.19 mm wide. An irregularly shaped kenozooid is always present distal to the ovicell, with a portion of membranous frontal wall underlain by a granular cryptocyst ( Figure 2B ). Avicularia not observed. Basal pore chambers present in vertical walls.

Etymology

Named for the first author’s sister, Judy Mare´.

Remarks

Pyriporoides was introduced by Hayward and Thorpe (1989) for the Antarctic species Membranipora uniserialis Waters, 1904 . The autozooids of P. uniserialis are shortly clavate, without the proximal cauda seen in P. judyae ; they are characterized by a broad cryptocystal shelf, but bear only a distal circlet of six short spines. The ovicell has a short longitudinal ridge, perhaps indicative of an occluded endooecial fenestra. The genus Daisyella was introduced by Gordon (1989) for two species of calloporids with encrusting, uniserial growth form, from deep waters off south-east New Zealand. Rosso and Taylor (2002) described a third species from two localities off southern Iceland, also in deep water, and provided a review of known calloporid genera with uniserial growth habit. Most of the species attributed to the seven genera reviewed by Rosso and Taylor (2002) are known from comparatively few samples and, as they note, data on ancestrula morphology, early astogeny and budding patterns may lead to a re-evaluation of generic distinctions.

Figures

Figure 2. Pyriporoides judyae sp.nov., SAM A27566:(A)autozooids showing cryptocyst and opesia, X40; (B) ovicelled autozooid, X80; (C) autozooid, X100; (D) colony showing autozooids, small zooids and ovicelled zooid, X40.