Bothriolepis heckeri, Lukševičs, 2001
publication ID |
https://doi.org/ 10.5281/zenodo.4664755 |
persistent identifier |
https://treatment.plazi.org/id/03CC6624-FFE1-FFAE-FEA9-FB6A9850F92E |
treatment provided by |
Felipe |
scientific name |
Bothriolepis heckeri |
status |
sp. nov. |
Bothriolepis heckeri n. sp. ( Figs 60 View FIG H-J; 62)
HOLOTYPE. — AMD PIN 835 View Materials /42.
MATERIAL EXAMINED. — PIN 835/41, an incomplete AMD; PIN 835/40, an incomplete La, Pn and Pmg; all gathered by R. Hecker in 1930.
LOCALITY AND HORIZON. — Outcrop at the right bank of Malyi Tuder River not far from Bilovo village, Novgorod region, Russia; Bilovo Beds(?), Famennian.
DIAGNOSIS. — Moderately large Bothriolepis with comparatively narrow and strongly arched AMD (B/L index of about 81) which bears high dorsal median crest arising just anteriorly the tergal angle. La is broad with very long infraorbital sensory groove diverging on La.
DESCRIPTION
PIN 835/42 is a relatively small almost complete AMD with damaged antero-lateral corners ( Figs 60H View FIG ; 62 View FIG B-D) and PIN 835/41 is an imperfect AMD without the right lateral margin and loosed left postero-lateral margin ( Figs 60I View FIG ; 62E View FIG ). The AMD is comparatively narrow with B/L index of about 81, with a gently concave anterior margin, which is moderately broad. The posterior margin is relatively narrow, about 1.2 time shorter than the anterior margin. The AMD is strongly arched with the angle between the two laminae about 100°, and bears a 2-3 mm high dorsal median crest (cr.d) which arises just anteriorly the tergal angle. The antero-lateral corner is weakly defined. The tergal angle is situated slightly posteriorly the anterior third of the plate. The posterior oblique dorsal sensory line grooves (dlg2) are well-defined. The ornament is reticular, sometimes with slightly defined ridges.
PIN 835/40 is an incomplete head-shield consisting of the Pn, Pmg and incomplete La which lacks the margin making contact with the Prm ( Figs 60J View FIG ; 62A View FIG ). The La plate is relatively broad as it is preserved, with gently defined antero-lateral corner. The infraorbital sensory groove crosses the plate far from the lateral and rostral margins. The central sensory line groove (csl) seem to finish at the level of the middle of an orbital fenestra length. The branch of the infraorbital sensory groove diverging on La (ifc2) is well-defined and unusually long. The Pn seems to be relatively broad as it is preserved. The Pmg of unusual shape with the median margins longer than the lateral margins.
DISCUSSION
Bothriolepis heckeri n. sp. differs from all the other known Bothriolepis from the Main Devonian Field in its broad La with unusually situated sensory grooves. B. cristata ( Miles 1968) from the Rosebrae Beds of Scotland also has a strongly developed dorsal median crest, but differs in other shape and general proportions of the AMD.
PIN |
Paleontological Institute, Russian Academy of Sciences |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Bothriolepis heckeri
Lukševičs, Erwin 2001 |
Bothriolepis heckeri
Lukševičs 2001 |
Bothriolepis
Eichwald 1840 |