-ˈtā(ˌ)lēz noun plural
Usage: capitalized
Etymology: New Latin, from Zygnemat-, Zygnema + -ales
: an order of green algae (class Chlorophyceae) that include the pond scums and desmids, are distinguished by the absence of asexual reproduction and lack of flagellated reproductive structure, and reproduce sexually by fusion of amoeboid gametes — compare akontae