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Taxonomy
Monotis (Entomonotis) was named by Marwick (1935). It is not extant.
It was assigned to Monotis by Marwick (1935), Grant-Mackie (1978), Grant-Mackie and Silberling (1990) and McRoberts (2011).
It was assigned to Monotis by Marwick (1935), Grant-Mackie (1978), Grant-Mackie and Silberling (1990) and McRoberts (2011).
Subtaxa
Monotis (Entomonotis) callazonensis, Monotis (Entomonotis) ochotica (syn. Monotis sparsicostata, Monotis acutecostata, Monotis longa, Monotis wingia, Monotis ambigua), Monotis (Entomonotis) pachypleura (syn. Monotis eurhachis, Monotis aequicostata), Monotis (Entomonotis) posteroplana, Monotis (Entomonotis) richmondiana, Monotis (Entomonotis) subcircularis (syn. Monotis gigantea, Monotis sibirica, Monotis intermedia), Monotis (Entomonotis) zabaikalica (syn. Monotis semiradiata)
Species lacking formal opinion data
Synonymy list
Year | Name and author |
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1935 | Monotis (Entomonotis) Marwick |
1978 | Monotis (Entomonotis) Grant-Mackie |
1990 | Monotis (Entomonotis) Grant-Mackie and Silberling |
2011 | Monotis (Entomonotis) McRoberts p. 644 |
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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.
Subg. †Monotis (Entomonotis) Marwick 1935
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†Monotis (Entomonotis) callazonensis Westermann 1962
†Monotis (Entomonotis) ochotica Keyserling 1848
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Invalid names: Monotis acutecostata Trechmann 1918 [synonym], Monotis ambigua Teller 1886 [synonym], Monotis longa Kiparisova 1932 [synonym], Monotis sparsicostata Teller 1886 [synonym], Monotis wingia Bando 1961 [synonym]
†Monotis (Entomonotis) pachypleura Teller 1886
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Invalid names: Monotis aequicostata Kiparisova 1940 [synonym], Monotis eurhachis Teller 1886 [synonym]
†Monotis (Entomonotis) posteroplana Westermann 1962
†Monotis (Entomonotis) richmondiana Zittel 1864
†Monotis (Entomonotis) subcircularis Gabb 1864
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Invalid names: Monotis gigantea Avias 1953 [synonym], Monotis intermedia Trechmann 1918 [synonym], Monotis sibirica Bytschkov 1966 [synonym]
†Monotis (Entomonotis) zabaikalica Kiparisova 1936
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Invalid names: Monotis semiradiata Ichikawa 1958 [synonym]
Diagnosis
Reference | Diagnosis | |
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Grant-Mackie and Silberling 1990 | Medium- to large-size Monotis of obliquely suboval outline. Strongly inequivalve, having a conspicuously inflated left valve, the umbo of which projects dorsally well above the hingeline, and a flat to slightly inflated right valve possessing a much less conspicuous umbo. Posterior ear moderate to proportionally large, smooth, well separated from the rest of the valve by a distinct posterior sinus. Radial ribs relatively broad, rounded, and well differentiated; on some species ribs weaken and fade posteriorly. Concentric striae generally absent or poorly developed. |