Thecideide phylogeny, heterochrony, and the gradual acquisition of characters

Jaecks, Glenn

doi:10.1201/9780203210437.ch25

Cited by 4 publications

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“…The apparent influence of progenesis in thecideide phylogeny and the general decrease in size of representatives of the order from the Triassic to the Upper Jurassic has raised the question (Jaecks and Carlson 2001; Jaecks 2001) whether thecideides have evolved through a number of different heterochronic pathways. MacKinnon (2001) identified a Late Jurassic kingenoid Trigonella pectunculus (von Schlotheim, 1820) and a megathyridoid Praeargyrotheca hexaplicata (Smirnova, 1972) stratigraphically consistent with a macro‐ to micro‐ ancestor–descendant relationship and considered the adult size discrepancy between the two species to represent a striking example of the heterochronic phenomenon of paedomorphosis.…”

Section: Discussionmentioning

confidence: 99%

“…comm. in Jaecks 2001, p. 243). Cohen (2007) now places thecideides as the sister group to terebratulides, with rhynchonellides as the sister group to both together, leaving open the possibility of a terebratulide ancestry for thecideides.…”

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“…Cohen (2007) now places thecideides as the sister group to terebratulides, with rhynchonellides as the sister group to both together, leaving open the possibility of a terebratulide ancestry for thecideides. Cladistically based views of thecideide phylogeny (Jaecks and Carlson 2001; Jaecks 2001) revived the possibility of a strophomenate rather than a spiriferide ancestor but were unable to identify the likely ancestral stock. Their conclusion was that early thecideides and their ancestors share too few characters to make the link defensible.…”

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“…comm. to Jaecks Aug. 2000, comment on manuscript accepted for publication) that their exclusion of Enallothecidea from the Thecideida on the basis of its lack of a median septum and an incomplete subperipheral rim (Jaecks and Carlson 2001, p. 213) was premature, Enallothecidea was reinstated as a thecideide (Jaecks 2001). In the current study (Pl.…”

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

Baker

Carlson

2010

Palaeontology

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“…Baker (1984Baker ( ,1990 discussed all relevant morphological data of these groups in comparison to the shell morphology of thecideid brachiopods and confirmed early suggestions of a spiriferide ancestor for the group. More recently, Jaecks (2001) and Jaecks & Carlson (2001) discussed strophomenide or spiriferide ancestry of thecideid brachiopods based on shell characters, but excluded a relationship with terebratulids. The latter was originally suggested by Cohen & Gawthrop (1997) and Cohen et al (1998) using molecular data, but later these results were qualified due to possible PCR artefacts (Cohen, pers.…”

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The first recent species of the unusual brachiopodKakanuiella(Thecideidae) from New Zealand deep waters

Lüter¹

2005

Systematics and Biodiversity

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A new thecideid brachiopod species Kakanuiella chathamensis sp. nov. is described from deep waters on the Chatham Rise, east of South Island, New Zealand. The new species bears an unusual character combination in the shell morphology of its dorsal valve, displaying a mixture of diagnostic characters of both Recent thecideid subfamilies Thecidellininae and Lacazellinae. The resultant consequences for the systematic position of the genus Kakanuiella are discussed.

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The Afro–South American brachiopod Castellaroina Boucot from the Silurian of the Argentine Precordillera: its origin and phylogenetic relationships

Benedetto

Montoya

2013

Paläontol Z

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Thecideide phylogeny, heterochrony, and the gradual acquisition of characters

Cited by 4 publications

References 0 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 first recent species of the unusual brachiopodKakanuiella(Thecideidae) from New Zealand deep waters

The Afro–South American brachiopod Castellaroina Boucot from the Silurian of the Argentine Precordillera: its origin and phylogenetic relationships

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