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Clorinda tumidula
Taxonomy
Athyris tumidula was named by Billings (1866) [Lectotype selected by Jin et al. (1993)]. Its type specimen is GSC 2456 and is a 3D body fossil.
It was recombined as Antirhynchonella tumidula by Bolton (1972); it was recombined as Clorinda tumidula by Jin et al. (1993), Jin and Copper (2000).
It was recombined as Antirhynchonella tumidula by Bolton (1972); it was recombined as Clorinda tumidula by Jin et al. (1993), Jin and Copper (2000).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1866 | Athyris tumidula Billings p. 47 |
| 1972 | Antirhynchonella tumidula Bolton figs. pl. 10, figs. 4, 5. |
| 1993 | Clorinda tumidula Jin et al. p. 40 figs. pl. 6, figs. 1-17 |
| 2000 | Clorinda tumidula Jin and Copper pp. 58 - 59 figs. Pl. 29, figs. 1-20; Pl. 30, figs. 1-5; Text-figs. 41,42 |
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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.
†Clorinda tumidula Billings 1866
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Jin and P. Copper 2000 | Shell medium-sized, slightly transverse, with average length 23.4 mm, width 24.7 mm, thickness 19.0 mm, and greatest length 28.0 mm, width 29.8 mm, thickness 22.7 mm (Text-fig. 41), subcircular to subrhomboidal in outline, strongly biconvex, with pedicle valve 1.2-1.4 times as deep as brachial valve. Hingeline straight, attaining about three-fourths of shell width. Anterior commissure uniplicate.
Ventral umbo high, tumid, strongly convex, rising about 3.5 mm above hingeline, with beak strongly curved, arching over but generally not touching dorsal umbo; interarea not developed; delthyrium small, devoid of deltidial covering, partly or completely obscured by dorsal umbo and beak; ventral sulcus relatively shallow, developed in anterior 1/3 of valve, with convex floor, extending into prominent, trapezoidal tongue protruding dorsa-anteriorly. Dorsal umbo relatively small, strongly convex, rising slightly abm e hingeline. Fold well developed only near anterior margin, with prominent re-entrant to accommodate tongue of pedicle valve. Shell surface smooth except for fine growth lines (about 5 per I mm). Spondylium relatively large, deep, occupying about 1/3-1/2 of valve depth (Text-fig. 42). Median septum high, extending anteriorly for about 1/5-1/6 of shell length in relatively large specimens. Teeth well developed. Vascular system present as fine, radial canals preserved only in anterior 1/2 of pedicle valve. Outer plates low, strongly divergent from each other (110-140°) towards shell floor in cross-section of their anterior ends. Inner plates thick, enclosing small hinge sockets. Bases of brachial processes partly buried in junctions of outer and inner plates, forming inconspicuous carinae only anteriorly. Muscle field deeply impressed, marked by 2 prominent longitudinal ridges. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Hendy 2009, Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Collections (23 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Aeronian | Canada (Quebec) | Clorinda tumidula (113289 163575 163582) | |
| Telychian | Canada (Quebec) | Clorinda tumidula (158765 163586) | |
| Telychian | Canada (Nunavut) | Clorinda tumidula (77338 77341 164000 164003 184875 184876 184877 184878 184881 184883 184885 184886 184887 184889 184890 184891 184894 184895) |