Figure 1.
Reconstruction of Sirilorica carlsbergi Peel, 2010.
Lateral view showing main morphological features, approximately ×1.5.
Figure 2.
Sirilorica carlsbergi Peel, 2010.
A, lateral view of compressed specimen showing the introvert with mouth tube and the posterior circlet of denticles lying anterior to the lorica. Posterior portion of lorica and anal field not preserved. MGUH 30474. B, lateral view of almost complete specimen with conical anal field, see also Figure 4E. MGUH 30475; w, wrinkles parallel to margin of anal field. C, lateral view of compressed lorica with denticulate basal portion of introvert, see also Figure 4F,G, 5A. Holotype, MGUH 29155. D, anterior margin of compressed lorica with prominent denticles developed on the adjacent introvert. The burrow at the left margin is discussed in the text. MGUH 30476. E, detail of ornamented plates with spikes forming the anterior margin of the lorica, showing three large denticles set within the textured introvert. Paratype, MGUH 29156. d, denticles. Scale bars: 4 mm (2 mm in E).
Figure 3.
Sirilorica pustulosa Peel, 2010.
A, lateral view of compressed specimen, showing the characteristic lorica with pustulose plate margins, and the conical anal field. MGUH 30477. Two raised burrows cross the lorica. B, enlarged detail of the posterior margin of the counterpart of the same specimen showing the prominent single marginal spike on each plate, plate ornamentation and the characteristic striation in the hinge zone visible on the internal surface of an underlying plate. For orientation, the same posterior spike (S) is identified in each figure. Scale bars: 4 mm.
Figure 4.
Sirilorica carlsbergi Peel, 2010.
A, disarticulated specimen in which the seven long posterior plates (numbered 1-7 at their anterior, pointed, end) are spread fan-like on the sediment surface. Two of three short, anterior, plates (I, II) show a similar orientation but the third (III) is flipped over such that its pointed posterior margin is now located anteriorly. MGUH 30478, scale bar: 4 mm. B, C, compressed specimen showing the introvert and circlet of denticles (d) anterior to the lorica, enlarged in C. MGUH 30479, scale bars: 4 mm. D, denticle with two posterior cusps and claw-like anterior cusp. MGUH 30480, scale bar: 1 mm. E, junction between spike-bearing lorica plates and textured introvert with large denticles, see also Figure 2D. MGUH 30475, scale bar: 4 mm. F, junction between spike-bearing lorica plates and textured introvert with large denticles, see also Figure 2C. Holotype, MGUH 29155, scale bar: 3 mm. G, posterior margin of lorica with each plate carrying a single spike, see also Figure 2C. Holotype MGUH 29155, scale bar: 3 mm.
Figure 5.
The lorica in Sirilorica carlsbergi Peel, 2010.
A, sketch of holotype showing plates forming the upper surface (unshaded) and lower surface (shaded) of the compacted cylindrical lorica; plates are arbitrarily numbered in an anticlockwise sequence, see also Figure 2C. MGUH 29155. B, same, paratype. MGUH 29156.
Figure 6.
Internal structures within the lorica of Sirilorica carlsbergi Peel, 2010.
A, compressed specimen showing the internal surface of the lorica and spatulose anal field crossed by a burrow. B, counterpart of the same specimen with X-X joining equivalent points of the two originally opposing surfaces which are now placed side by side. Y indicates equivalent points in A and B. Note the broad striated muscular bands (mb) extending from one plate to the next across the intervening hinge zone, and degraded margins of lining tissue. C, enlarged detail of B showing the longitudinal (ls) and transverse, crescentic, striations (ts) of muscle fibres in the muscular bands; Z indicates equivalent points in B and C. MGUH 30481, scale bars: 3.5 mm.
Figure 7.
Moulting in Sirilorica pustulosa Peel, 2010.
A, compressed specimen with introvert and anal field (Lorica 2) recently emerged from the exuvia (Lorica 1). B, enlargement of A showing rupturing of the suture separating the anterior and posterior circlets of plates in the lorica of the exuvia (lorica 1), with anterior plates splaying away from the rupture. X and Y indicate equivalent points in A and B. S, spikes on the posterior plate margins of lorica 2. MGUH 30482. Scale bars: 5 mm.
Figure 8.
Post-larva of Sirilorica Peel 2010.
A, lateral view of compressed lorica showing the posterior convergence of plicae; r indicates rectangular structure discussed in the text. MGUH 30483. B, as A. MGUH 30484. C, enlargement of B (X indicates equivalent points) showing the characteristic valley-and-ridge structure of the plicae and finely pustulose ornamentation. Scale bars: 3 mm.