biserial
by-SEER-ee-uhl
Definition
Arranged in two rows or series, specifically describing the configuration of plates or structures on opposite sides of a central axis.
Etymology
Derived from the Latin 'bi-' (meaning two) and 'series' (meaning a row or sequence), entering English to describe biological or botanical structures organized into two distinct parallel lines.
In the news
The article uses the term to describe the arrangement of ambulacral cover plates that form a roof over the food groove of the crinoids, distinguishing them from the tube feet.
In the entire 485-million-year fossil record of sea lilies, only one fossil had ever been found with the tube feet the animals catch their food with, and a pair of crushed specimens from a Quebec quarry has now produced the second and oldest case, at about 452
Read the full article ↗ScienceBlog.com