LOWER CARBONIFEROUS BRYOZOA 
Fig. 8 Hexites paradoxus sp. nov. Line drawing of external features of 
| BMNH PD9410; scale bar = 1 mm. 
fig.9 Nematopora hibernica sp. nov. Line drawing of external features 
of BMNH PD9430); scale bar = 1 mm. 
PARATYPES. BMNH PD943 1-9449: TCD.34015-34017; BELUM 
_ all from the same locality and horizon as the holotype. 
ERIVATION OF TRIVIAL NAME. 
reland. 
fable 3 Measurements of Nematopora hibernica (in mm), N=19. 
NM x Mn Mx CVw CVb 
3W 
From the Latin hibernica meaning 
3 176 0.59 0.41 0.76 TS) 9.81 
\DI 176 0.33 0.21 0.44 8.63 9.84 
\D2 172 0.12 0.08 0.20 10.34 6.89 
Asi 165 0.27 0.11 0.52 22.04 6.04 
$2 170 0.12 0.08 0.21 17.54 8.29 
IAGNOSIS. Nematopora with delicate dendroid zoarium. Branches 
ichotomise irregularly, are straight in outline and subcircular in 
‘Toss-section. Autozooecia are developed in four to five longitudinal 
Ows on one surface only. Autozooecial apertures are oval and 
jurrounded by small acanthostyles. Reverse surface barren, with 
our to five longitudinal rows of faint pustules. 
ESCRIPTION. Colonies are small, delicate, erect with irregularly 
ichotomising branches. The largest fragment examined measures 
BW 
able 4 Quantitative comparison between Carboniferous species of Nematopora (in mm). 
125 
16.4mm in length. Branches are straight (range of diameter from 
0.41mm to 0.76mm), sub-circular in cross-section. Branch width 
increases slightly prior to bifurcation. Interapertural areas may bear 
one to two rows of small acanthostyles which surround autozooecial 
apertures. The reverse surface is barren, either smooth or with small 
acanthostyles occurring in four longitudinal rows (Fig. 7). 
Autozooecia are arranged quincuncially in four to five longitudi- 
nal rows, irregularly spaced within and between rows. 
Autozooecial apertures are oval to ellipical in shape, often nar- 
rower distally. Vestibules are steep-sided and shallow distally. 
DISCUSSION. From the study area only 22 fragments of Nematopora 
hibernica were found. All are hollow silicified fragments in which 
only the surface has been replaced, and consequently details of 
internal morphology are unknown. 
Externally Nematopora is very distinctive. The rhombic shape of 
the autozooecial apertures, and the abundance of acanthostyles 
resembles that of Rhabdomeson rhombiferum (Phillips), but unlike 
the latter autozooecial apertures do not occur all the way around the 
branch. 
N. hibernica is only the second species of Nematopora to be 
described from the British Isles Nematopora hexagona having been 
described from the Silurian (Wenlock) of Shropshire (Owen, 1962). 
Only 27 species of Nematopora have been described worldwide 
throughout its stratigraphic range (Goryunova 1985). Of these only 
seven, found in the U.S.S.R., Afganistan, and Japan, occur in the 
Carboniferous: N. afgana Termier & Termier, 1971; N. donbassica, 
Dunaeva, 1961; N. kusbasensis Trizna, 1958; N. ivanovi Shulga- 
Nesterenko, 1955; N. parvula Shulga-Nesterenko, 1955; N. tulensis 
Morozova, 1955; and N. sp. indet. Sakagami, 1962. 
STRATIGRAPHICAL RANGE. Lower Carboniferous (Asbian). 
DISTRIBUTION. Carrick Lough, County Fermanagh, Ireland. 
Genus PSEUDONEMATOPORA Balakin, 1974 
TYPE SPECIES. Nematopora? turkestanica Nikiforova, 1948 by 
original designation from the Lower Carboniferous of the CIS 
(former Soviet Union). 
EMENDED DIAGNOSIS.  Arthrostylid with slender dendroid zoarium, 
with occasional dichotomising branches. Branches are of constant 
width and are circular to semicircular in cross-section. Autozooecia 
occur in 6 to 16 longitudinal rows, and are budded in an annular 
manner. Autozooecial apertures are circular to oval in shape, with 
proximal peristomes. Autozooecia originate from a central axis. 
Skeletal cysts may be present in the exozone. Terminal diaphragms 
developed in some species. Acanthostyles are absent. 
STRATIGRAPHICAL RANGE. 
naisian—lower Viséan). 
Lower Carboniferous (lower Tour- 
. hibernica sp. nov. 0.41-0.76 
/. afgana Termier & Termier, 1971 - 0.6-1.5 
. donbassica Dunaeva, 1961 - 0.89-1.20 
/. kusbasensis Trizna, 1958 10 0.96—1.00 
t: ivanovi Shulga-Nesterenko, 1955 - 0.70-0.90 
V. parvula Shulga-Nesterenko, 1955 - 0.25-0.30 
. tulensis Morozova, 1955 0.30-0.40 
. Sp. indet. Sakagami, 1962 8-10 1.00-1.10 
bata from original sources. 
ADI AD2 AS1 AS2 
0.21-0.44 0.08—0.20 0.11—0.52 0.08-0.21 
0.24-0.32 0.12-0.14 0.29-0.36 0.12 
0.18-0.22 0.08-0.12 - - 
0.40-0.45 0.15 - - 
0.30-0.35 0.07-0.10 — - 
0.20-0.22 0.10 = ~ 
0.24 0.13-0.16 = - 
