PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Idiospira longa

Rhynchonellata - Atrypida - Septatrypidae

Taxonomy

Cyclospira longa was named by Cooper (1956) [Cyclospira? longa]. Its type specimen is USNM 111390, a shell, and it is a 3D body fossil. Its type locality is Near Albany, which is in a Trentonian carbonate conglomerate/limestone in the Rysedorf Formation of New York.

It was recombined as Idiospira longa by Candela and Harper (2014).

Year	Name and author
1956	Cyclospira longa Cooper pp. 693 - 694 figs. Plate 142, 1, figures 39-43
1962	Cyclospira longa Williams pp. 251 - 252 figs. P1. XXIII, figs. 24, 27, 32
2014	Idiospira longa Candela and Harper p. SI

Diagnosis

Reference	Diagnosis
G. A. Cooper 1956	Shell small, pentagonal in outline, longer than wide with the greatest width at about the middle. Beak acute ; shell posterior to middle narrowing rapidly to the beak ; sides somewhat narrowly rounded ; anterior margin narrow and gently rounded. Anterior part of anterolateral extremities marked by 2 costae ; surface without other ornament than the costae and folds. Pedicle valve about twice as deep as the brachial valve, moderately convex and with the greatest convexity slightly posterior to the middle. Beak moderately incurved. Umbo narrowly swollen. Fold low, extending to a point slightly anterior to the middle where it passes into 2 narrowly rounded costae bounding a narrow sulcus. Flanks gently concave and with steep slopes to the margins. Brachial valve evenly and gently convex in lateral profile, with greatest convexity at about the middle. Posterior half slightly swollen and marked by a shallow and narrow depression that marks the position of the median septum. Sulcus originating slightly anterior to the middle, widening rapidly to the margin where it occupies about half the valve width. Sulcus for its entire length occupied by a narrowly rounded fold bearing a slight median longitudinal groove. Furrows defining median fold deep; folds bounding sulcus low but narrowly rounded. Median septum extending to point of origin of median fold.
A. Williams 1962	Small, subpentagonal Cyclospira almost nine-tenths as wide as long with a deep, convex pedicle valve inflated to a low fold medianly but flattening laterally and a brachial valve which is gently convex posteriorly and broadly sulcate anterior/y; ventral fold dividing into a pair of costae anteriorly with 3 additional faint costae ornamenting the flanks; teeth small, probably without dental lamellae, ventral muscle area not impressed; hinge-plate divided, supported by a conspicuous median septum extending anteriorly for over one-half the length of the brachial valve.

Measurements

No measurements are available

Time interval	Ma	Country or state	Original ID and collection number
Trentonian	457.3 - 449.6	USA (New York)	Cyclospira longa (164925)
Burrellian	456.6 - 452.5	United Kingdom (Scotland)	Cyclospira longa (165038 165046 165048 165050)