|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhynchonellata - Pentamerida - Parallelelasmatidae
It was corrected as Metacamerella by Williams (1962).
It was assigned to Brachiopoda by Reed (1917); to Brevicameridae by Williams (1962); to Parallelelasmatidae by Williams et al. (2002); and to Pentamerida by Sepkoski (2002).
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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.
|F. R. C. Reed 1917||Shell oval, biconvex. Pedicle-valve with low median fold near anterior end composed of several longitudinal plications chiefly developed towards front end; beak high, incurved, with open delthyrium; small false area on each side; interior with small subumbonal spondylium and short median septum. Brachial valve with lower beak than opposite valve ; low median fold near anterior end, composed of several longitudinal plications ; interior with pair of long recurved crura, pair of long parallel median septa, and muscle-scars as in Parastrophia. Shell thick, fibrous, punctate externally.|
|A. Williams 1962||Exterior.--Subequally biconvex syntrophiaceids with valves about as long as wide but having a subpentagonal outline due to the development of a pair of false interareas comprising the steeply plunging, postero-lateral margins of both valves; brachial valve with low axttero-median fold; adult shells costate anteriorly; shell substance impunctate.
Interior of pedicle valve.--Delthyrium open, teeth long, massive, swelling into lateral bosses and protruding almost normal to the plane of the ventral umbo, and supported by a pair of receding dental lamellae which converge to form a spondylium supported by a short median septum; genital areas pitted and occupying the floor of the valve immediately lateral and anterior to the spondylial septum.
Interior of brachial valve.--Crural bases well developed, slightly curved or straight, ankylosed to the edges of the false interareas by a pair of deeply concave socket plates, and attached to the floor of the valve by a pair of subparallel supporting plates; crural bases expanded antero-laterally to form a pair of accessory teeth; socket plates conspicuously hollowed laterally to accommodate the teeth; pitted genital areas lying immediately lateral to the supporting plates; dorsal adductor field probably quadripartite including a pair of indistinct scars lateral to the anterior ends of the supporting plates and a pair of deeply impressed, reniform scars separated by a broad, thickened ridge which lies anterior to the junction of the supporting plates with the floor of the valve.