Paraconularia sp.

Swami, Narendra K., Tripathi, Satish C., Laishram, Ramesh & Dharwadkar, Amit, 2017, First record of extinct Paraconularia (Cnidaria, Scyphozoa) from Tethyan sequence (Upper Permian) of Spiti valley, Himachal Himalaya, India, Palaeontologia Electronica 35 (8), pp. 1-6 : 2-5

Paraconularia sp.

Figure 4

Horizon. Lower Siltstone Member of the Gungri Formation, Upper Permian.

Locality. About 500 m to the west of the village Guling , Lahaul and Spiti district, Himachal Pradesh, India .

Description. Relatively large (35mm long), incomplete specimen preserves the apical wall but does not preserve the apertural margin. The specimen shows unequal width of faces, has moderately high apical angle (20°) and is conical in shape. The facial ridges (transverse ribs) are around 52–55 in number, are moderately strong, thickening on the apertural side and thinning towards the apical side. The facial ridges occur at regular intervals, show slight curvature near the midline, exhibit chevronlike features but do not oppose each other. They are widely spaced (two ribs per millimeter) and terminate at the corner groove. Facial ridges are associated with well-preserved fine, closely spaced (six to seven nodes per millimeter), circular nodes on both sides (apical and apertural). The midline is faintly developed. Interspace (Interridge area) is smooth, slightly curved. Corner groove is partly preserved, and spines are completely absent.

Close resemblance. Based on the ornamentation and dimension of the present specimen, it closely resembles the Paraconularia quadrisulcata ( Sowerby, 1821).

Figures

FIGURE 4. Paraconularia sp. embedded in the micaceous siltstone of the Gungri Formation. 1, View of single face. 2, Close-up view showing well-developed nodes on facial ridge (transverse rib) and interspace. 3, Apertural side showing widely spaced facial ridges, which alternately arranged either side of the midline. 4, Close-up view of the apertural side showing nodes on facial ridge.