In languages which use quantitative metres, such as Latin, Ancient Greek, Arabic, Persian, and
Sanskrit, the final syllable of any line is
anceps, that is, indifferently long or short. According to one view dating back to ancient times, even if the final syllable is prosodically short, it counts as long because of the pause which follows it (see
brevis in longo). Thus, any line ending x – u –, when catalectic, becomes u – x. An example in Ancient Greek is the iambic tetrameter, which in normal and catalectic form is as follows: :| x – u – | x – u – | x – u – | x – u – | :| x – u – | x – u – | x – u – | u – – | In classical Arabic, the most commonly used metre, the
ṭawīl, has normal and catalectic forms as follows: :| u – x | u – x – | u – x | u – u – | :| u – x | u – x – | u – u | u – – | In
Sanskrit, a comparison between the traditional
śloka and the
mandākrāntā metre reveals the same type of catalexis. The first line of the
Bhagavad Gita scans as follows: :| – – – – | u – – – || u u – – | u – u – | whereas the metre is as follows: :| – – – – | u uu uu – || – u – – | u – – | A similar phenomenon is also found in classical Persian. For example, the metre based on the choriamb pattern (– u u –) has a shortened form as follows (though both are not used in the same poem): :| – u u – | – u u – | – u u – | – u u – | :| – u u – | – u u – | – u – | In Latin and Greek, the rarely used trochaic octonarius is not catalectic, but the common
trochaic septenarius is catalectic: :| – u – x | – u – x || – u – x | – u – x | :| – u – x | – u – x || – u – x | – u – | The anapaestic octonarius and anapaestic septenarius differ as follows. When the final syllable is removed, the final element must be a long syllable, not a double short (see
Metres of Roman comedy): :| uu – uu – | uu – uu – || uu – uu – | uu – uu – | :| uu – uu – | uu – uu – || uu – uu – | uu – – | ==In ancient Greek==