Thaiichthys was well described by Cavin, Deesri and Suteethorn 2013
Recently added to the LRT,
Thaiichthys (Figs 1,2, Cavin, Deesri and Suteethorn 2013, Late Jurassic to Early Cretaceous) is used here as a skull bone/suture primer for this primitive clade of slow-moving freshwater predatory fish leading to estant gars like Lepisosteus (Fig 3). This clade is marked by subdivided skull bones with more sutures than those found in most fish skulls. That makes identity difficult.
A good Bauplan is essential. Sometimes those are hard to find.
Thaiichthys buddhabutrensis
is transitional between Lepidotes and Lepisosteus in the LRT. This fish is notable for its deep torso combined with a low skull resulting in a bison-like hump.
The extant Cuban gar,
Lepisosteus (Fig 3), really needs a good Bauplan, like Thaiichthys (Fig 2), to identify the plethora of subdivided skull bones, an essential first step prior to scoring for analysis. The diagram and written labels reflecting traditional identities are from Gregory 1933.
Nothing here can be accomplished
without earlier discoveries, studies and publications. When you attempt a phylogenetic analysis of fish be prepared for the unexpected. A correction made in one clade will sometimes ripple through the entire tree. You will learn something in the process: Patience. BTW, I should not be the only worker attempting this.
References
Cavin L, Deesri U and Suteethorn V 2013. Osteology and relationships of Thaiichthys nov. gen:A ginglymodi fom the Late Jurassic – Early Cretaceous of Thailand. Palaeontology 56(1):183–208.
Gregory WK 1933. Fish skulls. A study of the evolution of natural mechanisms. American Philosophical Society 23(2) 1–481.
wiki/Thaiichthys – not yet posted
Source: https://pterosaurheresies.wordpress.com/2023/11/20/thaiichthys-was-well-described-by-cavin-deesri-and-suteethorn-2013/
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