Consider the diagram of adapical surface of cedaroid morphology. Choose the correct set of 5 morphological terms.
1-interambulacrum, 2-ambulacrum, 3-genital plate, 4-ocular plate, 5-aboral pole
Regular echinoids such as the cidaroids have a pentaradiate test. Seen from the aboral (adapical) side, the corona is built of ten double columns of plates: five narrow ambulacra, whose plates carry the pore pairs for the tube feet, alternating with five broad interambulacra that carry the large primary spine tubercles. At the top the columns meet the apical system, a ring of five genital plates and five ocular plates around the periproct.
In the labelled figure, label 1 brackets the wide plate column carrying the big tubercles, which is an interambulacrum, and label 2 marks the narrow pore-bearing band, which is an ambulacrum. Label 3 is one of the larger plates of the apical ring pierced by a gonopore, i.e. a genital plate, while label 4 is a small plate that sits at the upper end of an ambulacral column and carries the terminal tube foot pore, i.e. an ocular plate. Label 5 lies at the centre of the apical system, the aboral pole around which the periproct opens.
The combination that names 1 as ambulacrum and 2 as interambulacrum swaps the broad and narrow areas. The combination that calls 3 an ocular plate and 4 a genital plate reverses the two apical plate types (genital plates are the larger, gonopore-bearing ones). The combination that places the aboral pole at 3 and the genital plate at 5 puts the centre of the apical system on a peripheral plate.
1-interambulacrum, 2-ambulacrum, 3-genital plate, 4-ocular plate, 5-aboral pole option is correct.
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