Thericium bursucense, Harzhauser & Guzhov & Landau, 2025
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publication ID |
https://doi.org/10.11646/zootaxa.5625.1.1 |
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publication LSID |
lsid:zoobank.org:pub:E4AB35FE-B158-4722-A849-C271E419DEE7 |
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persistent identifier |
https://treatment.plazi.org/id/211887DE-3552-DC7C-FF54-86CEF2BFFD38 |
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treatment provided by |
Plazi |
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scientific name |
Thericium bursucense |
| status |
sp. nov. |
Thericium bursucense sp. nov.
Figs 44F View FIGURE 44 1 –F View FIGURE 1 3 View FIGURE 3
Type material. Holotype, PIN 5904 View Materials /79, SL: 50.3 mm, MD: 15 mm, Bursuc ( Moldova), Figs 44F View FIGURE 44 1 –F View FIGURE 1 3 View FIGURE 3 .
Type locality. Bursuc ( Moldova), Moldavian Platform .
Type stratum. Coquina in clays.
Age. Middle Miocene, latest Badenian (Serravallian).
Etymology. After the locality, village Bursuc.
Diagnosis. Large sized, slender shell, characterized by change in sculpture from predominant axial sculpture on early convex teleoconch whorls towards spirally ornamented and flattened later whorls with narrow subsutural concavity and delicate and dense axial ribs forming numerous small tubercles with spiral sculpture.
Description. Large sized, moderately slender shell with orthoconoid spire of no less than 14 teleoconch whorls, attaining near 60 mm in height. Protoconch and earliest teleoconch whorls unknown. First preserved teleoconch whorls convex with prominent axial ribs and varices overrun by about six close-set delicate primary and secondary spiral cords. About nine axial ribs and three varices per whorl (one varix after three axial ribs). Periphery around mid-whorl. Suture weakly incised, deeper on early teleoconch. Sculpture changes on later teleoconch whorls (on last eight-six preserved whorls). Axial ribs weaken and increase in number; number of ribs between indistinct varices increase to ten. Varices become subobsolete on last seven-five teleoconch whorls. Whorl profile almost straight sided except for distinct, narrow concavity below subsutural spiral cord. Subsutural cord bears two delicately tubercular spiral threads; even weaker tubercular spiral cord in concavity, which is abapically delimited by additional tubercular cord. Another seven narrow, low, weakly tuberculate spiral cords, follow abapically. Spiral sculpture overrunning>40 narrow, delicate, weakly opisthocyrt axial ribs per whorl. Last whorl with varix placed opposite aperture. Base with one moderately prominent peribasal cord and about five further spiral cords over base and fasciole. Aperture largely broken. Columella broadly and shallowly excavated, weakly twisted at siphonal canal. Columellar callus forming moderately broad rim, sharply delimited from base. Siphonal canal moderately long and wide, curved abaperturally, slightly deflected to the left.
Discussion. This species is known only from one locality from strata dated as uppermost Badenian with impoverished, partly endemic fauna, which is comparable to the Buglovian fauna (= latest Badenian) of Laskarev 1914 (648, 652: strata of Ushytsya river). We interpret Thericium bursucense sp. nov. as a result of anagenesis derived from the late Badenian T. dzieduszyckii ( Friedberg, 1914) , from which it differs in the numerous and more delicate axial sculpture without nodes on late teleoconch whorls and the delicate spiral sculpture.
Paleoenvironment. Unknown.
Distribution. Latest Badenian (Serravallian) of the Moldavian Platform.
Central Paratethys. Late Badenian (Middle Miocene): Moldavian Platform: Bursuc ( Moldova) (hoc opus).
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.