Grossilepis tuberculata ( Gross, 1941 )

Lukševičs, Erwin, 2001, Bothriolepid antiarchs (Vertebrata, Placodermi) from the Devonian of the north-western part of the East European Platform, Geodiversitas 23 (4), pp. 489-609 : 595-597

publication ID

https://doi.org/ 10.5281/zenodo.4664755

persistent identifier

https://treatment.plazi.org/id/03CC6624-FFD3-FF9B-FCBF-FA3D9A33F92F

treatment provided by

Felipe

scientific name

Grossilepis tuberculata ( Gross, 1941 )
status

 

Grossilepis tuberculata ( Gross, 1941) ( Figs 79 View FIG ; 80 View FIG )

Bothriolepis tuberculata Gross 1941: 32-57 , abb. 25, 26A-G, 27A-C, 28-43; taf. 18-28.

Bothriolepis cellulosa (Pander) – Gross 1932: 24 (p.p.); 1933: 36-39, taf. 4, fig. 5 (p.p.). — Obruchev 1947: pl. LV, fig. 4.

Grossilepis tuberculata (Gross) – Stensiö 1948: 524- 534, text-figs 26L, 28E, 35F, 36C-E, 39D, 41D, 43E, 44F, 45H, 47D, 48D, 53D, 266-271.

HOLOTYPE. — AMD kept in SMNH ( Gross 1941: abb. 30F, taf. 21, fig. 1).

MATERIAL EXAMINED. — LDM 65/77, MxL; NHM 17827,La; NHM 17811,17817, 17820,three PMD; NHM 17812, PVL; LUGM, several unnumbered specimens including AMD, PMD, La plates is aaditional to that described by Gross (1941) and Stensiö (1948).

LOCALITIES AND HORIZON. — The type locality is an outcrop of dolomite, dolomite marl and clay at the bank of Pērse River near Koknese, Latvia; The lower Frasnian Pļaviņas Formation. This species was found in the Snetnaya Gora Member in several localities in western and eastern Latvia: outcrops along Daugava River from Kaktiņi to the ruins of Koknese castle, exposures at Amata River not far from Kārļi and along Mazā Jugla and Lielā Jugla Rivers, outcrops at Venta River near Kuldīga and at Riežupe River ( Sorokin 1978), Lithuania: borehole Berčiunai, 73-76 m deep, borehole Pakapiai, 78.2-80.3 m deep, and Pskov region of Russia: outcrop at the right bank of Velikaya River near Piskovichi hamlet, Snetnaya Gora, Pskov and Chudovo Beds of Russia. The remains of G. tuberculata are very rare in the middle part of the Pļaviņas Formation (Atzele and Sēlija Members, which corresponds to the Pskov Beds in Russia) and until now reported only from eastern Latvia ( Sorokin 1978).

DIAGNOSIS. — Relatively small bothriolepidoid with estimated length of dorsal wall of trunk armour reaching about 9 cm. Head-shield moderately vaulted with anterior margin much shorter than total breadth of the plate. Postero-lateral corners of head-shield extends anteriorly to the level of the orbital fenestra posterior margin. Nu of moderate width, L/B index of about 61- 73, usually with concave posterior margin bearing the median process, shallow postpineal notch on the anterior margin, slightly pronounced lateral and posterolateral corners. Pn with broad lateral division. Tergal angle situated between the anterior and middle thirds of the AMD length. Posterior margin of AMD very broad. Dorsal median ridge normally developed from the tergal angle backwards to the posterior corner of PMD. Dorsal corner slightly pronounced or sometimes even not be clearly identifiable. Pectoral fin fairly slender, proximal segment from 4.5 to slightly more than 5 times as long as broad. Lateral spines of the pectoral fin numerous, small, closely set and obtuse. Ornament consists of numerous closely and irregularly set pointed tubercles in well-grown individuals.

REMARKS

This species is well-described by Gross (1941) and Stensiö (1948). Their descriptions are based on a large collection of the placoderm and other fish remains kept at Swedish Museum of Natural History, Stockholm. Although little new material is available that has not been described before, the descriptions of Gross and Stensiö can be added, providing a new definition of this species, as the definition of Grossilepis tuberculata suggested by Stensiö (1948: 523- 524) was the same as that of the genus Grossilepis .

DISCUSSION

The comparison of Grossilepis tuberculata with G. spinosa is provided below the description of the latter. G. tuberculata differs well from G. brandi Miles, 1968 in its relatively narrower Nu and a proportions of the anterior and posterior divisions of the lateral margin of this plate.

SMNH

Department of Paleozoology, Swedish Museum of Natural History

LDM

Latvian Natural Histotry Museum, department of Entomology

Kingdom

Animalia

Phylum

Chordata

Family

Bothriolepididae

Genus

Grossilepis

Loc

Grossilepis tuberculata ( Gross, 1941 )

Lukševičs, Erwin 2001
2001
Loc

Bothriolepis tuberculata

GROSS W. 1941: 57
1941
Loc

Bothriolepis cellulosa (Pander)

GROSS W. 1932: 24
1932
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