Leviella bogschi Kozur, 1972

Forel, Marie-Béatrice, Kolar-Jurkovšek, Tea & Jurkovšek, Bogdan, 2020, Ostracods from the ‘ Raibl Beds’ (Carnian, Late Triassic) of Belca section in Karavanke Mountains, northwestern Slovenia, Geodiversitas 42 (21), pp. 377-407 : 395

publication ID	https://doi.org/ 10.5252/geodiversitas2020v42a21
publication LSID	urn:lsid:zoobank.org:pub:7EC0E4FA-D538-4CE2-91B8-D7F549C32985
DOI	https://doi.org/10.5281/zenodo.4488369
persistent identifier	https://treatment.plazi.org/id/5A3887A8-FF85-0E61-0CC2-FB1D1A490AAC
treatment provided by	Felipe
scientific name	Leviella bogschi Kozur, 1972
status

Treatment

( Fig. 11 View FIG A-J)

Leviella bogschi Kozur, 1972: 20, pl. 1, fig. 4; pl. 2, figs 1-7. — Kristan-Tollmann et al. 1991b: 206, pl. 3, figs 1, 3.

EXAMINED MATERIAL. — More than 100 specimens, including isolated valves and complete carapaces.

OCCURRENCE. — Carnian, Late Triassic, Veszprem, Balatón highland, Hungary (Kozur 1972); Carnian, Late Triassic,Transdanubian range, Hungary (Kristan-Tollmann et al. 1991b); Nicoraella ? budaensis conodont zone, late Julian-?earliest Tuvalian, Carnian, Late Triassic, samples BE2, 17, 18, 21, 23/1 ( Fig. 3 View FIG ), Belca section, ‘Raibl Beds’, Karavanke Mountains, Slovenia (this work).

DIMENSIONS. — Fig. 12. View FIG

DISCUSSION

Leviella bogschi Kozur, 1972 has been found in all samples of the Belca section. It is rare in samples BE2 and BE23/1 but is moderately abundant in samples BE17 to BE21 ( Fig. 3 View FIG ). This species is another species typical of the Carnian that was only known from Hungary until the Belca record. The dispersal of the sizes of both left and right valves in Belca is the largest observed until now for this species, with the smallest known specimens and the largest documented left valve. Kristan-Tollmann et al. (1991b) stated that the holotype of this species described by Kozur (1972) is not a mature stage: this observation is confirmed with the specimens from Belca, for both valves ( Fig. 12 View FIG ). Until now, three complete carapaces of L. bogschi are known to science [one from Kozur (1972), two from this work]. The gaps between the successive scatter plots in L. bogschi are well marked and allow the distinction of six ontogenetic stages for the left valves (A-5 to Adult) and seven for the right valves (A-6 to Adult). In early juveniles, the valves are very assymetric with narrow posterior end and weakly developed lateral ridges. The ontogenetic development of L. bogschi is marked by the progressive enlargement of the posterior end of the carapaces and strengthening of the lateral ridges and sulcus. The three carapaces known from this species belong to the Adult, A-1 and A-5 stages ( Fig. 12 View FIG ). Although rare, these carapaces show that the overlap of RV over LV occurs as early as A-5 and increases through the ontogenetic development.