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Leptaena
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Strophomenoidea
Family:
Rafinesquinidae
Formal Genus Name and Reference:
Leptaena DALMAN, 1828, p. 94
Type Species:
L. rugosa, SD KING, 1846, p. 28
Images
(Click to enlarge in a new window)
Fig. 150, 1a-e. *L$. (L.) rugosa, Dalmanitina Beds, Ashgill, Alleberg, Västergötland, Sweden, $a, b$, ventral, lateral views of ventral internal mold, BMNH B 13594, x1.5, c, d$, dorsal internal mold, x1.5$, latex cast of it, BMNH BB 67944, x1.5$, e, latex cast of juvenile dorsal internal mold, BMNH BB 67946, X2 (new)., ——Fig. 150, 1f. L. (L.) inaequalis (Röōmusoks), Johvi Beds, lower Caradoc, Anija, Estonia, holotype, ventral exterior, TAGI BR 1346, X1.5 (Rõõmusoks, 1989)., ——Fig. 150, 1g. L. (L.) taxilla Oraspóld, Johvi Stage, lower Caradoc, Alliku, Estonia, dorsal interior, x2$ (Rõõmusoks, 1989)., ——Fig. 150, 1h. L. (L.) acuteplicata Schmidt, Porkuni Stage, upper Ashgill, Estonia, ventral interior, TAGI BR 1335, x1.7$ (Rõõmusoks, 1989)., ——Fig. 150, 1i, j. L. (L.) paucirugata (Röómusoks), Vormsi Stage, Ashgill, Kõrgessaare, Estonia, holotype, ventral, lateral views of ventral valve, TAGI BR 1349, X1.5 (Rõõmusoks, 1989)., ——Fig. 150, 1k. L. (L.) trifidum (Marek & Havlíček), Kosov Formation, Ashgill, Bechovice, Czech Republic, dorsal internal mold, OMR VH 354e, X3 (Havliček, new).
Synonyms
Astamena, Kurnamena, Leptaenella, Oriskany, Leptaenopoma, Leptaenopoma, ?Leptaenulopsis, Oandumena, Schmidtomena, Similoleptaena, ?Turgenostrophia,
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Llanvirn)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
Devonian (Pragian, ?Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Outline usually transverse, rounded anteriorly; profile concavoconvex with sharp anterior dorsal geniculation; ornament costellate to unequally parvicostellate; concentric rugae variable but usually well developed; small pseudodeltidium; large chilidium; short dental plates; ventral muscle field varies from subcircular to elongate with bounding ridges usually developed posterolaterally, sometimes curving round anteriorly; cardinal process lobes elongate, ventrally directed; socket ridges present but usually weak, sometimes with crenulations; dorsal muscle field variably impressed with median ridge often present; transmuscle ridges, diaphragm variably developed in dorsal valve.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Strophomenoidea
Family:
Rafinesquinidae
Formal Genus Name and Reference:
Leptaena DALMAN, 1828, p. 94
Type Species:
L. rugosa, SD KING, 1846, p. 28
Images
(Click to enlarge in a new window)
Fig. 150, 1a-e. *L$. (L.) rugosa, Dalmanitina Beds, Ashgill, Alleberg, Västergötland, Sweden, $a, b$, ventral, lateral views of ventral internal mold, BMNH B 13594, x1.5, c, d$, dorsal internal mold, x1.5$, latex cast of it, BMNH BB 67944, x1.5$, e, latex cast of juvenile dorsal internal mold, BMNH BB 67946, X2 (new)., ——Fig. 150, 1f. L. (L.) inaequalis (Röōmusoks), Johvi Beds, lower Caradoc, Anija, Estonia, holotype, ventral exterior, TAGI BR 1346, X1.5 (Rõõmusoks, 1989)., ——Fig. 150, 1g. L. (L.) taxilla Oraspóld, Johvi Stage, lower Caradoc, Alliku, Estonia, dorsal interior, x2$ (Rõõmusoks, 1989)., ——Fig. 150, 1h. L. (L.) acuteplicata Schmidt, Porkuni Stage, upper Ashgill, Estonia, ventral interior, TAGI BR 1335, x1.7$ (Rõõmusoks, 1989)., ——Fig. 150, 1i, j. L. (L.) paucirugata (Röómusoks), Vormsi Stage, Ashgill, Kõrgessaare, Estonia, holotype, ventral, lateral views of ventral valve, TAGI BR 1349, X1.5 (Rõõmusoks, 1989)., ——Fig. 150, 1k. L. (L.) trifidum (Marek & Havlíček), Kosov Formation, Ashgill, Bechovice, Czech Republic, dorsal internal mold, OMR VH 354e, X3 (Havliček, new).
Synonyms
Astamena, Kurnamena, Leptaenella, Oriskany, Leptaenopoma, Leptaenopoma, ?Leptaenulopsis, Oandumena, Schmidtomena, Similoleptaena, ?Turgenostrophia,
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Llanvirn)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
Devonian (Pragian, ?Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Outline usually transverse, rounded anteriorly; profile concavoconvex with sharp anterior dorsal geniculation; ornament costellate to unequally parvicostellate; concentric rugae variable but usually well developed; small pseudodeltidium; large chilidium; short dental plates; ventral muscle field varies from subcircular to elongate with bounding ridges usually developed posterolaterally, sometimes curving round anteriorly; cardinal process lobes elongate, ventrally directed; socket ridges present but usually weak, sometimes with crenulations; dorsal muscle field variably impressed with median ridge often present; transmuscle ridges, diaphragm variably developed in dorsal valve.