|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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|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.