140 
Table 16 Comparison of Clausotrypa species (dimensions in mm). 
P.N. WYSE JACKSON 
a 
ZD ADI AD2 IWT1 IWT2 
C. ramosa (Owen, 1973) comb. nov. 0.46—1.12 0.06—0.16 0.05—0.14 0.28-0.85 0.15—0.42 
C. limpida Gorjunova, 1988 0.6-0.9 0.25 0.13 -- 
C. clara Krutchinina, 1986 2.5-3.0 0.4-0.5 0.2-0.25 0.2 0.12 
C. conferata Bassler, 1929 2.8 0.32 0.25 0.2 0.1-0.15 
C. costata Romantchuk, 1981 4.2-4.3 0.21 0.16-0.2 0.3-0.6 0.43-0.64 
C. exillis Sakagami, 1961 1.3-1.4 0.1-0.13 = = = 
C. minor Bassler, 1929 1S 0.2-0.25 0.15—-0.20 1.0 
C. monstruosa Morozova, 1970 4.04.5 0.16-0.2 - - 
C. monticola (Eichwald, 1860) 1.0-2.5 0.17-0.2 0.12-0.14 - 
C. petaloides Romantchuk, 1970 4.8-5.0 0.24-0.25 - - - 
C. separata Bassler, 1929 0.15-2.6 0.3 0.17 0.4 0.3 
C. spinosa Fritz; 1932 1.0-1.5 0.26-0.27 0.13-0.14 0.35 0.3 
a 
Data from original sources. 
DESCRIPTION. Colonies consist of very slender branches that di- 
vide at irregularly spaced intervals, with branches bifurcating at low 
angles, and with lateral ramifications also occurring. Branches are 
straight or gently flexous, and are circular in cross-section. No 
complete colonies have been discovered, and the largest fragment 
examined was 1.53mm in length. Bifurcations and lateral branches 
appear to be widely spaced, as two laterals have not been observed 
on the same colony. Distal branches are thinner than proximal 
branches, with a range in diameter from 0.26mm to 0.36mm ob- 
served in one colony fragment. Branch width decreases slightly after 
bifurcation but soon increases to equal the width of the preceeding 
link. Lateral branches are thinner than main branches. The obverse 
surface bears faint undulating striae, occasionally with rows of small 
circular stylets (weathering to small pits) along the crests of striae. 
Autozooecial apertures are regularly arranged in quincunx, in 
four to seven longitudinal rows. They are small, circular, lack 
peristomes and are evenly spaced along the length of the branch. 
Some apertures are surrounded by six small pustules, giving them a 
stellate appearance. The reverse surface is smooth or faintly striated. 
Autozooecial chambers are rectangular in profile with pentagonal 
bases. 
Internally the skeletal arrangement is tripartite; a primary granu- 
lar layer is surrounded by an inner laminated layer lining zooecial 
chambers, and an outer laminated layer. Small stylets composed of 
granular skeleton penetrate through the outer laminated skeleton 
where they appear as pustules or weathered pits. 
DISCUSSION. A complete systematic description of the genus 
Baculopora and the species B. megastoma is given in Wyse Jackson 
(1988). 
Genus DIPLOPORARIA Nickles & Bassler, 1900 
TYPE SPECIES. Glauconome (Diplopora) marginalis Young & 
Young, 1875, by original designation from the Upper Limestone 
Shales (Lower Carboniferous) of the British Isles (cited localities: 
Hairmyres, East Kilbride; Beghill, near Hamilton; Gillfoot, near 
Carluke; Hook Head, County Wexford). 
Diploporaria marginalis (Young & Young, 1875) 
Figs 44, 49 
1875 Glauconome (Diplopora) marginalis Young & Young: 326, 
pl.3, figs 14-21. 
1877. Glauconome (Diplopora) marginalis Young & Young; Vine, 
fig. 207. 
1881 | Glauconome (Diplopora) marginalis Young & Young; Vine: 
B39) 
| 
| 
| 
1885 Diplopora marginalis Young & Young; Vine: 83. 
1900  Diploporaria marginalis (Young & Young); Nickles & 
Bassler: 233. 
1953 Diploporaria marginalis (Young & Young); Bassler: G127, 
figs 87 — 6a, 6b. 
1975 Diploporaria marginalis (Young & Young); Graham: 9, pl. 
4, figs 6, 6a, 6b. 
1987 Diploporaria marginalis (Young & Young); Bancroft: 196. 1 
1991 Diploporaria marginalis (Young & Young); Billing: 41. i . 
LECTOTYPE. Graham (1975) designated a lectotype but cited al 
cavity slide that contained several zoaria. Consequently Bancroft! 
(1984-ms) designated specimen number 14 in cavity slide HM D144 
(Hunterian Museum) as lectotype. This designation is formalised 
herein. 
MATERIAL. Three zoarial fragments, BMNH PD9580;TCD.34050- 
34051, Upper part of the Glencar Limestone (Viséan, Asbian), 
Carrick Lough, County Fermanagh. 
DESCRIPTION. Zoaria are small non-pinnate expansions, composed) 
of delicate straight branches 0.21 to 0.34 mm in diameter with sub-) 
circular cross-sections. Lateral branches were not developed in the 
specimen examined. 
Autozooecia are arranged in two longitudinal rows along the 
length of the branch. Autozooecial apertures are small (0.07—0.09 
mm in diameter), circular, and are surrounded by a complete 
peristome. They are regularly spaced two to two and a half diameters, 
apart either side of a median carina. The lateral margin and up to hall 
i 
the apertural diameter protrudes beyond the margin of the branch 
This produces a sharp serrated branch outline. 
A faint median carina carries regularly spaced oval to circulal 
nodes 0.02 mm in diameter. Two equally faint longitudinal ridges li¢ 
either side of the median carina inside the inner margins 0}; 
autozooecial apertures. Interapertural areas are smooth. The reversé 
surface is gently rounded and smooth. Internal features were no 
seen. 
Table 17 Measurements of Diploporaria marginalis (in mm). N=1. | 
NM Xx Mn Mx CVw CVby 
BW 10 0.27 0.21 0.34 4.40 Z| 
AD 10 0.08 0.07 0.09 10.52 = 
AS 11 0.29 0.28 0.33 28.85 = 
NS 6 0.30 0.28 0.32 22.69 = 
DIscussION. Diploporaria marginalis is very rare in the Asbian q 
County Fermanagh. In the present study only three zoarial frag 1" 
