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Kassinella tarimensis
Taxonomy
Kassinella tarimensis was named by Zhan et al. (2014). Its type specimen is NIGP 158479 and is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2014 | Kassinella tarimensis Zhan et al. pp. 137 - 138 figs. 12, 13A–H |
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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.
†Kassinella tarimensis Zhan et al. 2014
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. B. Zhan et al. 2014 | Small shells of Kassinella with well-developed anteriorly pointing tubercles along peripheral rim of internal shell surface and a very thick and low myophragm in ventral valve.
Small shell generally within 5 mm long and wide,slightly elongated semicircular, with an average length/widthratio at 0.65 and 0.69 for dorsal and ventral valves respectively,widest along hinge line or slightly anterior of it; gently concavo-convex, dorsal valve nearly flat, ventral valve evenly convex orwith a narrow curvature at about four-fifths shell length whilevisceral area nearly flat. Cardinal extremities rounded or subrect-angular. Lateral margins evenly curved, and anterior commissurerectimarginate. Ventral interarea low, planar, about 8 percent ofventral length, apsacline; delthyrium wide, covered by a gen-tly convex pseudodeltidium. Dorsal interarea linear, orthocline,about 6 percent of dorsal length; notothyrium narrow, coveredby a strongly convex chilidium. Densely populated costellaeat least of three different sizes, increasing mainly by inser-tions, about 6 costellae per 0.5 mm along shell anterior marginirrespective to shell sizes; primary costellae originating fromapex, thickest in size behaving like rafters on shell surface;smaller secondary costellae starting at about one-third of shelllength, and third order occurring around two-thirds shell lengthwhile sizes becoming smaller. Concentric ornamentation rarely seen. Delthyrial cavity narrow and shallow. Teeth small, wedge-shaped, without dental plates or with very short, thick and thickand subparallel dental plates (Fig. 12). Muscle field clearlyimpressed, transverse rectangle in shape, about one-third of shelllength and width; adductor scar well impressed, confined todelthyrial cavity and posterior of myophragm; bilobate diductorscars separated by a thick myophragm in their posterior half,and slightly divergent anteriorly; each lobe of diductor scarslarger and deeper in posterior part; myophragm also becomingwider anteriorly and even slightly undercut at its anterior end.Mantle canal system saccate; a pair of vascula media originatingfrom both anterior ends of diductor scars, extending forward at avery small angle for a short distance before branching mediallyand laterally. Peripheral rim thick and low, but apparently higherthan shell visceral area, with densely populated anteriorly point-ing tubercles on it, which also sporadically occur in inner shellsurface of visceral area. Some small (rather than strong) tuber-cles in posterolateral parts (Figs. 12, 13E). |