The first thecideide brachiopod from the Jurassic of North America

Baker, P. G.; Wilson, Mark A.

doi:10.1111/1475-4983.00100

Cited by 12 publications

(15 citation statements)

References 8 publications

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“…The few specimens that are available (Pl. 1, figs 1–5) confirm the earlier discoveries (Nekvasilová 1967; Baker 1989 a ; Baker and Wilson 1999) that initially the ventral interarea is very small and narrow, little more than a strip of shell material on either side of a relatively large externally undemarcated (Pl. 1, figs 4, 5) pseudodeltidium.…”

supporting

confidence: 85%

“…In specimens where the valves are conjoined (Pl. 1, figs 1–3; see also Baker and Wilson 1999, pl. 1, fig.…”

mentioning

confidence: 96%

“…The adolescent to adult development of the ventral valve after the free ventral wall has become established is unspectacular and mainly involves the extension of the hinge‐line associated with the formation of the interarea, the development of the hemispondylium and the acquisition of any internal ornament. The changes are adequately documented elsewhere (Baker 1989 a ; Baker and Manceñido 1997; Baker and Wilson 1999) and need no further description here.…”

mentioning

confidence: 98%

“…LE 37522. Repositories of specimens of Ancorellina Manceñido and Damborenea, 1990, Bifolium Elliott, 1948, Bosquetella Smirnova, 1969, Enallothecidea Baker, 1983, Eothecidellina Baker, 1991, Kakanuiella Lee and Robinson, 2003, Lacazella Munier‐Chalmas, 1880, Mimikonstantia Baker and Elston, 1984, Moorellina Elliott, 1953, Neothecidella Pajaud, 1970, Ospreyella Lüter and Wörheide, 2003, Pachymoorellina Baker, 1989 a , Pajaudina Logan, 1988, Praelacazella Smirnova, 1969, Protolacazella Baker, 2005, Rioultina Pajaud, 1966, Stentorina Baker and Wilson, 1999, Thecidellina Thomson, 1915 and Thecospira Zugmeyer, 1880, providing corroborative evidence discussed in the study are recorded in the references cited in the text.…”

mentioning

confidence: 99%

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The early ontogeny of Jurassic thecideoid brachiopods and its contribution to the understanding of thecideoid ancestry

Baker

Carlson

2010

Palaeontology

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A collection of very early brephic juveniles from the Upper Aalenian of the Cotswolds, England, has provided the first opportunity to study the ontogeny of thecideoids prior to the recognizable development of a median septum. Traced towards their origin, the enduring characters of thecideides appear to be cementation, a delthyrium closed by a pseudodeltidium, an almost circular dorsal valve with a prominent erect bilobed cardinal process, well-defined inner socket ridges, widely spaced lateral adductor muscle fields, tubercles, fibrous secondary shell lining both valves and probably endopunctae. The subperipheral rim and median septum so characteristic of adult thecideoids are undeveloped in the earliest juveniles. Initiation of the development of the free ventral wall in the ventral valve is identified as an important event in thecideoid ontogeny. Further important discoveries arising from the study are that the crura-like outgrowths which form the brachial bridge in thecideides are not structurally homologous with the crura of spiriferides or terebratulides and that during their earliest ontogenetic development thecidellinids and thecideids are indistinguishable. Also, the identification of morphological characters correlative with both palaeontological and neontological approaches to thecideoid phylogeny has important implications for thecideide taxonomy. Interpretation of the morphology exhibited by the Cotswold specimens introduces the probability that during their earliest ontogeny moorellinin, thecidein and lacazellin dorsal valves follow the same development pattern and the described ontogenetic sequence has been corroborated by evidence from Jurassic rocks of Argentina, North America and France, from Cretaceous rocks of England, Central Europe and Czechoslovakia, also from extant species from the Atlantic, Indian and Pacific oceans, and to an extent which suggests the pattern of ontogenetic development revealed has been typical of thecideoids throughout their history.

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supporting

confidence: 85%

“…In specimens where the valves are conjoined (Pl. 1, figs 1–3; see also Baker and Wilson 1999, pl. 1, fig.…”

mentioning

confidence: 96%

mentioning

confidence: 98%

mentioning

confidence: 99%

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The early ontogeny of Jurassic thecideoid brachiopods and its contribution to the understanding of thecideoid ancestry

Baker

Carlson

2010

Palaeontology

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“…The morphology of Enallothecidea is considered (Baker and Carlson 2010, p. 659) to be close to the ancestral morphotype. Research by Baker and Wilson (1999) on their new genus Stentorina indicated that the early juvenile ventral umbo was palintropic. Therefore, the palintrope and the delthyrium may be regarded as plesiomorphic characters in thecideides.…”

Section: Resultsmentioning

confidence: 99%

The development and shell microstructure of the pseudodeltidium and interarea in thecideide brachiopods

Logan

Baker

2013

Palaeontology

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This study examines the development of the delthyrium, pseudodeltidium and interarea, their growth during the early juvenile stages of ontogeny and the extrapolation of morphology from adult shells to the probable juvenile state. Examination of the development and shell microstructure of the cardinalia of early juvenile thecideide brachiopod ventral valves from Jurassic, Cretaceous and Holocene specimens suggests that the delthyrium develops early in ontogeny and that the initial development of the pseudodeltidium precedes that of the interarea. Also, until the interarea is formed, the postero-lateral flanks of the ventral umbo are palintropic. The development of the interarea can be seen to be a consequence of the lateral extension of the early juvenile hinge line. Initially, the pseudodeltidium consists solely of a thin plate of primary shell material. Comparison of the morphology of the pseudodeltidium of early juveniles with that of adults suggests that the initially curved lateral profile of the pseudodeltidium is retained, or even accentuated, in the ontogeny of lacazellines, but in all thecidellinines, with the exception of Pachymoorellina and Minutella, following the appearance of the interarea, the pseudodeltidium becomes flattened and often appears continuous with the interarea. However, we do not support any proposal that suggests that, in thecideides, only those forms in which the delthyrium is closed by a dorsally convex plate should be considered to possess a pseudodeltidium sensu stricto, mainly because of physiological differences and the prospect of possible taxonomic confusion in the future. Instead, we propose the term planodeltidium for a flat pseudodeltidium, typically developed in the thecidellinines, and rugideltidium for a convex pseudodeltidium, typically developed in the lacazellines, but also in Pachymoorellina and Minutella. Despite the presence of a rugideltidium, we believe the affinities of Minutella are more strongly with the thecidellinines and have included it in the new subfamily Minutellinae of the family Thecidellinidae.

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Destructive Tomography

2013

Techniques for Virtual Palaeontology

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The first thecideide brachiopod from the Jurassic of North America

Cited by 12 publications

References 8 publications

The early ontogeny of Jurassic thecideoid brachiopods and its contribution to the understanding of thecideoid ancestry

The early ontogeny of Jurassic thecideoid brachiopods and its contribution to the understanding of thecideoid ancestry

The development and shell microstructure of the pseudodeltidium and interarea in thecideide brachiopods

Destructive Tomography

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