Vaquerosella, Durham, 1955
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publication ID |
https://doi.org/ 10.26879/1040 |
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publication LSID |
lsid:zoobank.org:pub:5B28523A-C6D3-4AE1-AC2F-FF789BF99E4A |
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persistent identifier |
https://treatment.plazi.org/id/761AD07D-FF94-0237-7C94-F95E08CAFA7F |
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treatment provided by |
Felipe |
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scientific name |
Vaquerosella |
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Genus VAQUEROSELLA Durham, 1955 View in CoL
Type species. Scutella andersoni Twitchell , in Clark and Twitchell, 1915 ( Durham, 1955).
Diagnosis. (sensu Durham, 1955) Small to large, flattened; margin of test strongly indented at posterior ambulacra, less distinctly at other ambulacra. Apical system slightly anterior. Petals two-thirds to three-fourths length of radius; outer member of pore-pair moderately elongate. Periproct marginal. Peristome very slightly anterior; ambulacral food grooves simple, unbranched, at times indistinct. Basicoronal plates well developed; basicoronal interambulacral plates wider but not always higher than interambulacral plates. Post-basicoronal plates usually separated from basicoronal plates; three or four post-basicoronal interambulacral plates to column in paired interambulacra on oral surface; two post-basicoronal plates to a column in posterior interambulacrum on oral surface; five or six post-basicoronal plates to column in three anterior ambulacra on oral surface, sometimes only four plates in two posterior ambulacral columns. Interambulacra about two-thirds width of ambulacra at ambitus. The well-marked posterior ambulacral notching of the test and tendency to a width greater than length are characteristic.
Comments. Six nominal species have been described in the genus Vaquerosella ( Figure 3 View FIGURE 3 ): 1) the type species V. andersoni , 2) V. coreyi , 3) V. durhami , 4) V. merriami , 5) V. norrisi , and 6) V. vaquerosensis .
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