JURASSIC BRYOZOANS FROM BALTOW, POLAND 
eptomultisparsa norberti sp. nov. Figs 4-8 
OLOTYPE. MUZ PIG 1601/II/1 (Figs 6-7). 
ARATYPES. MUZ PIG 1601/II/2 (3 specimens). 
AME. In recognition of the contributions to bryozoology of the 
ustrian palaeontologist Dr Norbert Vavra. 
ESCRIPTION. Colony multiserial, sheet-like, unilamellar, either 
lanar (Fig. 4) or tubular (Fig. 5) in shape. Viewed from the growing 
dge the colony is thin, generally only one zooid in depth. Early 
rowth stages unknown. Original substrates not preserved. 
Autozooids immersed, zooidal boundaries indistinct, frontal walls 
lat for most of their length though slightly convex distally, about 
.10-1.50 mm long by 0.25-0.35 mm wide. Apertures widely- 
paced, circular or a little wider than long, about 0.12 mm in 
iameter, occasionally closed by terminal diaphragms located at 
bout the level of the frontal wall. Preserved peristomes moderately 
hort, tapering distally. Pseudopores longitudinally elongate, slit- 
ike when unworn (Fig. 8) but elliptical when worn. 
Gonozooids apparently infrequent, only a single example having 
een found (Fig. 6). Distal frontal wall almost flat, longitudinally 
longate, 1.50 mm long by 0.65 mm wide. Ooeciopore (Fig. 7) 
ubterminal, larger than an autozooidal aperture, transversely elon- 
ate, 0.10 mm long by 0.25 mm wide. 
EMARKS. Walter (1970) assigned seven Jurassic species to 
eptomultisparsa, and Taylor (1980) added one further new species. 
he autozooids in R. cobergonensis Walter, 1970, R.? margopuncta 
aagen, 1867), R. cricopora (Vine, 1881), R. oolitica (Vine, 1881) 
id R. tumida Taylor, 1980, have distinctly convex frontal walls, 
nlike the rather flat frontal walls of R. norberti. Reptomultisparsa 
crustans (d’Orbigny, 1850) differs from R. norberti in its much 
arger gonozooid, as well as its multilamellar colonies invariably 
‘ncrusting gastropod shells once occupied by hermit crabs (Buge & 
ischer, 1970; Taylor, 1994). Reptomultisparsa ventricosa (Vine, 
881), a species characteristic of the Aalenian and Bajocian of 
igs 2-3 Oncousoecia sp., MUZ PIG 1601/II/8, Oxfordian, Balt6w, Poland. Scanning electron micrographs of uncoated specimen. 2, distorted gonozooid 
and autozooids at coalescence of colony branches, x 45. 3, ooeciopore, x 167. 
England, is more similar to R. norberti except for its inflated 
gonozooids with smaller ooeciopores, and subcircular pseudopores. 
The unilamellar, often tubular colonies of R. norberti prompt 
comparison with Diastopora, notably the type species D. foliacea 
Lamouroux, 1821, from the Bathonian of Normandy. There are, 
however, striking differences in the form of the gonozooid, and in 
the morphology of the pseudopores as revealed by SEM. In D. 
foliacea, the gonozooid is transversely elongate and has lateral lobes 
which extend distally of the ooeciopore (Walter, 1970, pl. 8, fig. 1), 
whereas in R. norberti it is longitudinally elongate (Fig. 6). 
Pseudopores in frontal walls of D. foliacea zooids are gull-shaped 
(PDT unpublished), whereas those in R. norberti are long and slit- 
like (Fig. 8). These differences underscore the dual importance in 
cyclostome identification of specimens with gonozooids and of 
detailed SEM studies of pseudopore morphology. Without access to 
these two characters it is often difficult to make confident species 
determinations. 
Family PLAGIOECIIDAE Canu, 1918 
(= DIASTOPORIDAE Gregory, 1899) 
Genus HYPOROSOPORA Canu & Bassler, 1929 
TYPE SPECIES. 
Bathonian. 
Hyporosopora typica Canu & Bassler, 1929, 
REMARKS. Although Hyporosopora was considered to be a jun- 
ior synonym of Plagioecia Canu, 1918, by Walter (1970), 
differences exist between the two genera in the morphology of 
their gonozooids. Colonies of the extant type species of Plagioecia, 
Berenicea patina Lamouroux, 1816, have gonozooids with exceed- 
ingly broad, arcuate frontal walls which are profusely pierced by 
autozooidal apertures (see Hayward & Ryland, 1985). 
Hyporosopora gonozooids are considerably smaller, typically 
subtriangular in outline, and are not pierced by autozooidal aper- 
tures (see Taylor & Sequieros, 1982). 
