2 Systematic Descriptions
53
a
b
c
Fig. 2.36 a Laesurae accompanied by folds, seen from distal face through to proximal. b Side view
showing half distal and half proximal faces. c Proximal face; laesurae accompanied by folds
commissures. Proximal face rounded pyramidal with thin exine. Sculpture granoverrucate; elements of low relief, 1–3 µ in diameter, evenly shaped and spaced.
Sculpture absent on proximal face.
Dimensions: 40–66 µ (30 specimens measured).
Remarks and comparisons: M. tentula is distinguished from the other species of
Microbaculispora described in this study mainly by its sculpture which differs
from the other species of the same genus. Of significance is its distribution; M.
tentula is restricted to the Lower Permian (Sakmarian), whereas M. trisina, M.
micronodosa and M. villosa are all found in the Upper Permian of Collie Basin.
The stratigraphically restricted distribution is significant and justifies the species
separation.
Pseudoreticulatispora pseudoreticulata (Balme and Hennelly 1956) (Fig. 2.37).
Occurrence: Lower Permian of Collie–Muja Basin. Frequent in Bore site B/1975,
1945
; Bore Site D/1938
, 1936
.
Description: Amb triangular-rounded. Trilete; laesurae distinctive, extending
almost to equatorial margin of spore, followed by folds. Proximal face pyramidal.
Exine on distal face up to 3 µ thick, thinning towards proximal face. Sculpture verrucate. Verrucae of low relief, regular in shape, 2–3 µ in diameter, closely spaced,
often coalescing, diminishing in elevation towards proximal face and absent on
contact area.
53
a
b
c
Fig. 2.36 a Laesurae accompanied by folds, seen from distal face through to proximal. b Side view
showing half distal and half proximal faces. c Proximal face; laesurae accompanied by folds
commissures. Proximal face rounded pyramidal with thin exine. Sculpture granoverrucate; elements of low relief, 1–3 µ in diameter, evenly shaped and spaced.
Sculpture absent on proximal face.
Dimensions: 40–66 µ (30 specimens measured).
Remarks and comparisons: M. tentula is distinguished from the other species of
Microbaculispora described in this study mainly by its sculpture which differs
from the other species of the same genus. Of significance is its distribution; M.
tentula is restricted to the Lower Permian (Sakmarian), whereas M. trisina, M.
micronodosa and M. villosa are all found in the Upper Permian of Collie Basin.
The stratigraphically restricted distribution is significant and justifies the species
separation.
Pseudoreticulatispora pseudoreticulata (Balme and Hennelly 1956) (Fig. 2.37).
Occurrence: Lower Permian of Collie–Muja Basin. Frequent in Bore site B/1975,
1945
; Bore Site D/1938
, 1936
.
Description: Amb triangular-rounded. Trilete; laesurae distinctive, extending
almost to equatorial margin of spore, followed by folds. Proximal face pyramidal.
Exine on distal face up to 3 µ thick, thinning towards proximal face. Sculpture verrucate. Verrucae of low relief, regular in shape, 2–3 µ in diameter, closely spaced,
often coalescing, diminishing in elevation towards proximal face and absent on
contact area.