Pterodinium eisenackii Jain, 1977

Holotype: Jain, 1977, pl.6, fig.73; Jan du Chêne et al., 1986, pl.90, figs.6-7
Age: Early Albian

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Original description: [Jain, 1977b]:

Pterodinium eisenacki sp. nov.
PI. 6. fig. 73

1962 - pterodinium cornutum Cookson & Eisenack, p. 490, pI. 3, figs 5-6

Holotype - PI. 6, fig. 73; Slide no. 5053-37.
Locality - Kallakkudi Limestone Quarry II, Dalmiapuram, South India.
Horizon - Grey Shale Member, Dalmiapuram Formation; Early Albian.
Diagnosis - Cyst oval in shape; endophragm thick, periphragm hyaline. Apical horn short. Cingulum distinct, helicoid.
Tabulation based on present specimens ?2-4, 6", 4-5c, 6"', 1''''. Borders of fields high, strongly serrate. Archaeopyle not observed.

Measurements Holotype Range
Cyst size 60 x 54 μm 55-65 x 50-60 μm
Width of 2·4 μm 2-3 μm
cingulum

Comparison - P. eisenacki sp. nov. differs from P. aliferum EisenacK (1958); P. magnoserratum Cookson & Eisenack (1962) and P. cornutum Cookson & Eisenack (1962) in its distinct tabulation with 5 cingular plates.
Remarks - The Australian forms described by Coobon and Ei!"enack (1962,p. 490, pI. 3, figs. 5-6) rome from of ?Aptian-Albian horizon.