Boreosomus arcticus (aka Diaphorognathus, Woodward 1912; Priem 1924; Early Triassic; 250 mya, 10-20cm) nests with two pachycormids including Ohmdenia. Note the procumbent dentary teeth and anterior dorsal fin.

Seinstedtia parva (Schultze et al 2023, MLU Sei.2010.76, Norian, Triassic, 3.5cm long) is a tiny descendant of Australosomus in the LRT. It nests basal the Strunius clade and the Dapedium clade, AND the clade of fish that give rise to lungfish and tetrapods.

?Pachycormus macropterus (Cawley et al. 2018; Early Jurassic, BRLSI M1332) reported on 3D specimens attributed to Pachycormus, but here nests closer to Ohmdenia (above).

Palaeoniscum freieslebeni (Blainville 1818, Permian, 30cm) nests with Euthynotus in the LRT. Very few differences separate them. This is the genus that served as the holotype for the Palaeoniscidae and Palaenisciformes. Here this genus is a Permians semi-lobe fin, not related to another tested Palaeoniscum macropomus.

This specimen does not look like others assigned to the same genus. According to Wikipedia, "Palaeoniscidae sensu lato has become a wastebasket taxon (probably paraphyletic). In the strict sense, the Palaeoniscidae should only encompass the genus Palaeoniscum and only those genera that are closely related to it. However, due to insufficient knowledge of Palaeoniscum and many other early actinopterygians, and because most of these taxa have never been included in cladistic analyses, it is still uncertain which genera other than Palaeoniscum should be placed in Palaeoniscidae sensu stricto to make this a monophyletic group."

Euthynotus incognitus (Agassiz 1843, Toarcian, Early Jurassic, 30cm) is the traditional basalmost pachycormiform. Here this small-finned taxa nests between Boreosomus and Ohmdenia.