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Dalmanella modica
Taxonomy
Dalmanella modica was named by Williams (1963). Its type specimen is BB. 28960, a shell (Internal mould of conjoined valves), and it is a 3D body fossil. Its type locality is Gelli-grin Group, Caradoc, Bala District, Merionethshire, which is in a Longvillian offshore mudstone/siltstone in the United Kingdom.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1963 | Dalmanella modica Williams pp. 380 - 386 figs. PI. 4, figs. 24, 25 ; PI. 5, figs. 1-7 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Dalmanella modica Williams 1963
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1963 | Subcircular, unequally biconvex Dalmanella with sulcate brachial valve about three-quarters as long as wide and almost one-fifth as deep as long and evenly convex pedicle valve just over one-third as deep as long ; radial ornamentation costellate with modal count of 3 costellae per mm., 5 mm. anterior of dorsal umbo, external secondary branching poorly developed in sectors I to IV ; dental lamellae divergent, extending anteriorly for just over one-fifth the length of pedicle valve, teeth strong ; adult ventral muscle field subcordate in outline slightly narrower than long with submedian diductor scars extending forward of umbo for less than one-third the length of pedicle valve and not enclosing broad median adductor scar ; adult cardinalia consisting of undifferentiated bilobed cardinal process and rod-like brachiophores supported by a pair of subparallel bases, extending forward for about one-fifth the length of brachial valve, and a pair of widely divergent socket plates, almost twice as wide as brachiophore bases are long ; median ridge short, fading anteriorly into broad internal crest of sulcus, and dividing adductor field into a pair of suboval scars about one-half as long as brachial valve ; pallial sinus patterns unknown. |