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Boreiosturion labyrinthicus
Taxonomy
Boreiosturion labyrinthicus was named by Murray et al. (2023). Its type specimen is UALVP 62007, a partial skeleton (posterior part of the skull, the subopercles, and anterior part of the pectoral girdles), and it is a 3D body fossil. Its type locality is North Saskatchewan River Valley near Capilano Park, which is in a Campanian terrestrial horizon in the Horseshoe Canyon Formation of Canada. It is the type species of Boreiosturion.
Synonymy list
| Year | Name and author |
|---|---|
| 2023 | Boreiosturion labyrinthicus Murray et al. p. 3 figs. Figs. 2-5 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Boreiosturion labyrinthicus Murray et al. 2023
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. M. Murray et al. 2023 | A member of the Acipenseridae (based on pres- ence of a dorsal scute tightly sutured to the back of the skull, cla- vicle and cleithrum tightly sutured to form a cardiac shield, strongly ornamented dermal bones, and presence of a pectoral fin spine) with the first dorsal scute extending anteriorly to reach the same level as the anterodorsal process of the supraclei- thrum, a diamond-shaped median extrascapular, and skull orna- mentation varying depending on region, being formed of very fine ridges on the subopercle, fine pits with stronger ridges on the skull roof, and deep pits with thick tubercular ridges on the
clavicles. Further differs from Scaphirhynchus platorynchus and Pseudoscaphirhynchus spp. by lacking median spines on the par- ietal, posttemporal, and supracleithrum; from Huso huso, which has a free first dorsal scute, by having the first dorsal scute forming the posterior part of the skull roof; from †Priscosturion longipinnis by the presence of a median extrascapular; from †Protoscaphirhynchus squamosus by the subopercle being essen- tially round (height to width equals 58 mm:35 mm in †P. squamosus; Wilimovsky, 1956); from †Endahlichthys milviae- gis (in which the parietals meet one another in the midline throughout their length) by the median extrascapular separating the left and right parietals for their posterior extent; and from †Anchiacipenser acanthaspis by lacking the lateral extrascapular (although these features are shared with other taxa or individuals). The genus Acipenser lacks diagnostic characters, and the osteology of most extant species are not described in sufficient detail to allow comparison with the partial fossil. However, the difference in age between the new Maastrichtian species and the extant species (65–70 My) make it unlikely that the new stur- geon is conspecific with any extant Acipenser species, and no Cre- taceous material has been previously identified as representing an extant species. Extinct species in Acipenser are based on iso- lated scutes and spines, for which we have no overlapping material, making comparison impossible, with the exception of two species recently named by Hilton and Grande (2023) based on articulated specimens: †Acipenser amnisinferos and †A. praeparatorum. The new Edmonton species differs from †A. amnisinferos by the ornamentation on the clavicle in †A. amnisinferos being formed by radiating ridges as opposed to the deep pits and tubercles in the new taxon, and from †A. praeparatorum by the features noted above (anterior extent of first dorsal scute, lack of lateral extrascapular and median extrascapular separating posterior portions of parietals from one another). |
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988, Kiessling 2004 | |||||
Age range: Late/Upper Campanian or 83.60000 to 72.20000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | Canada (Alberta) | Boreiosturion labyrinthicus (type locality: 231935) |