Spiniferites fenestratus Duxbury, 2001, p.114–115, fig.14, nos.1–6.

Holotype: Duxbury, 2001, fig.14, no.1.
Age: late Hauterivian–mid Barremian

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Original description (Duxbury, 2001):

Spiniferites fenestratus n. sp.

Holotype: Figure 14.1.
Type Locality: Well 13/24a-4 at 5870 ft (ditch cuttings), Early Barremian, E.F H20.0.
Derivation of Name: From the Latin fenestra, a window - in reference to the fenestrate parasutural crests.

Diagnosis: A species of Spiniferites with an ovoidal endocyst, ornamented by fairly dense, low verrucae. Short gonal (trifurcate) and parasutural
(bifurcate) processes are proximally connected by parasutural crests which can be fairly high. Hypocystal processes are generally higher than those in the epicyst. Each parasutural crest is entirely fenestrate, and effectively composed of individual, variously connected strands of material. The archeopyle is single paraplate precingular (3").

Dimensions: Holotype: 74 x 69 μm
Overall: 74 (63) 53 x 69 (59) 50 μm
Specimens Measured - 8

Comments: Spiniferites fenestratus n. sp. is most similar to Spiniferites multibrevis (DAVEY & WLLIAMS, 1966) BELOW, 1982, particularly in its
overall size and process length. However, the distinctive crestal structure sets it apart from all other species of this genus.
This species is restricted to the Middle Barremian to Late Hauterivian interval: it is consistently present and can be common.