Laxitextella laxitexta ( Jones, 1890 )
publication ID |
https://doi.org/ 10.5281/zenodo.13515004 |
persistent identifier |
https://treatment.plazi.org/id/03863D74-FFCA-5B41-FC96-8541FAB9F86C |
treatment provided by |
Felipe |
scientific name |
Laxitextella laxitexta ( Jones, 1890 ) |
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Laxitextella laxitexta ( Jones, 1890)
Figs. 5A View Fig , 7 View Fig .
Estheria minuta, Alberti ; Jones 1862: 57, pl. 2: 1–7.
Estheria laxitexta Sandberger ; Sandberger 1871: 48 (nomen nudum). Estheria minuta Alberti ( E. laxitexta Sandberger ); Jones 1890: 387– 388, pl. 12: 8.
Euestheria laxitecta (Jones) ; Raymond 1946: 242.
Euestheria laxitecta (Sandberger) ; Kobayashi 1954: 54, 98.
Isaura laxitexta laxitexta ( Jones, 1890) ; Reible 1962: 210–212, fig. 15, pl. 8: 3, 4.
Isaura hausmanni ( Schmidt, 1938) ; Reible 1962: 214–215, fig. 17, pl. 9: 3.
Palaeestheria laxitexta ( Jones, 1890) ; Warth 1969: 137, fig. 7, pl. 3: 5.
Laxitextella laxitexta ( Sandberger, 1871) ; Kozur 1982: 378–379.
Material.—18 complete or slightly damaged valves and 20 damaged specimens.
Description.—Carapace of moderate size, varying in outline from elongate ovoidal to subquadrate, up to 9.0 mm long and up to 5.5 mm high; lateral convexity greatest just behind and below the umbo in anterior third of valve; dorsal margin almost straight, varies in relative length; anterior margin broadly rounded, posterior ventrally truncated, ventral margin more or less convex; umbo small, situated close to anterior end of dorsal margin, protruding above dorsal margin; growth bands approximately 28 in largest specimens, ventral growth bands closely spaced in adult specimens, median widely spaced; surface of growth bands ornamented by polygonal reticulation, in largest specimens usually 2–3 meshes (0.026 –0.039 mm in diameter) are present in growth bands in ventral part, 4 in mid−ventral part and 5–6 (0.065 –0.091 mm in diameter) in median part of the carapace.
Remarks.— Laxitextella laxitexta is similar in ornamentation pattern to Laxitextella sp. sensu Seegis (1997) from the Lehrberg Beds of southern Germany.
The described species is also similar in surface ornament pattern to Loxomegaglypta wetlugiana Novojilov, 1958 from the Early Triassic of the Volga region (see Novojilov 1960: fig. 504) but differs from the latter in having the umbo situated close to the anterior end of the dorsal margin. Laxitextella laxitexta laxitexta illustrated by Reible (1962: pl. 8: 5, 6) probably represents Howellisaura fimbriata ( Warth, 1969) . Estheria minuta illustrated by Roemer (1870: pl.15: 10) from the Late Triassic of the Upper Silesia (Hellewalder Estherien−Schichten), probably belongs to a new species, closely related to the Laxitextella laxitexta .
Occurrence.—Gipskeuper of South Germany;?Late Triassic of England; late Carnian, Krasiejów, Poland.
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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Laxitextella laxitexta ( Jones, 1890 )
Olempska, Ewa 2004 |
Laxitextella laxitexta ( Sandberger, 1871 )
Kozur, H. 1982: 378 |
Palaeestheria laxitexta ( Jones, 1890 )
Warth, M. 1969: 137 |
Isaura laxitexta laxitexta ( Jones, 1890 )
Reible, P. 1962: 210 |
Isaura hausmanni ( Schmidt, 1938 )
Reible, P. 1962: 214 |
Euestheria laxitecta (Sandberger)
Kobayashi, T. 1954: 54 |
Euestheria laxitecta (Jones)
Raymond, P. 1946: 242 |
Estheria laxitexta
Jones, T. R. 1890: 387 |
Sandberger, F. 1871: 48 |
Estheria minuta
Jones, T. R. 1862: 57 |