Sterrhinae

Meyrick, 1892

Waves and Mochas

Tribe Guides

Sterrhinae is a large of geometer moths (Geometridae) comprising approximately 3,000 described , with exceptional diversity in the tropics decreasing toward higher latitudes and elevations. The subfamily was established by Edward Meyrick in 1892 and includes the taxonomically challenging Idaea and Scopula, which together account for more than half of all species. Members are commonly known as 'waves' due to their characteristic wing patterns. The group exhibits notable morphological synapomorphies including forewing areoles and specific venation patterns that distinguish it from other geometrid subfamilies.

Timandra by (c) Donald Hobern, some rights reserved (CC BY). Used under a CC-BY license.

Cyclophora pendulinaria by (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda. Used under a CC-BY license.

Semaeopus marginata by (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick. Used under a CC-BY license.

Pronunciation

How to pronounce Sterrhinae: /stɛˈriːnaɪ/

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Identification

Distinguished from other Geometridae by the presence of one or two areoles in the forewings combined with the specific point of origin of M1 relative to the areole. The absence of anterolateral extensions on the male second abdominal sternite is a key diagnostic character. The hammer- ansa in the tympanal organ and absence of tympanic in most separate Sterrhinae from superficially similar groups. Wing patterns with wavy fasciae are characteristic but not exclusive. Male genitalia often uninformative for species-level identification within some (e.g., Scopula), requiring reliance on female genitalia .

Images

Habitat

Predominantly tropical, with decreasing at higher latitudes and elevations. African of some (e.g., Isoplenodia) associated with wet forest or marsh mosaic . Arboreal lineages (e.g., Cyclophora) occur in forest , while many species inhabit low herbaceous vegetation.

Distribution

Global distribution with maximum diversity in tropical regions. Present on all continents except Antarctica. Palaearctic, Afrotropical, Oriental, and Australasian regions well represented. of such as Scopula and Idaea occur across multiple biogeographic realms.

Seasonality

Majority of . Many species easily flushed from vegetation during daytime. Some lineages entirely .

Diet

Larvae of many feed on low herbs. Species in the Cyclophora lineage are arboreal feeders.

Life Cycle

Complete with , larva, pupa, and stages. stages and detailed unknown for many .

Behavior

activity predominant. Day-flushing common—many rest on vegetation and become active when disturbed. Some lineages have evolved entirely habits.

Similar Taxa

LarentiinaeHistorically suggested as sister group based on shared male secondary sexual organ distribution and female corpus bursae signum structure; distinguished by different wing venation and tympanal organ .
GeometrinaeSometimes placed as sister in molecular ; distinguished by absence of olefinic acetates and derivatives (unique to Sterrhinae among Geometridae) and different wing pattern elements.
EnnominaeSuperficially similar geometrid ; distinguished by absence of forewing areoles and different abdominal sternite .

More Details

Systematic History

Sterrhinae is a junior synonym of Idaeidae (Butler, 1881), but the former name is universally preferred due to established usage. The contains eight recognized tribes: Cosymbiini, Cyllopodini, Lythriini (transferred from Larentiinae in 2008), Rhodometrini, Rhodostrophiini, Scopulini, Sterrhini, and Timandrini. Recent molecular and morphological work has added Haemaleni and Lissoblemmini as new tribes.

Chemical Autapomorphy

Sterrhinae uniquely possesses olefinic acetates and derivatives among Geometridae, a characteristic that has influenced hypotheses about its phylogenetic position as potentially the most basal sister group to other geometrid .

Taxonomic Challenges

Idaea and Scopula together contain more than half of all Sterrhinae and present significant taxonomic difficulties due to high , subtle morphological differences, and frequent cryptic species. Male genitalia are often uninformative for species delimitation in Scopula, requiring reliance on female genitalia and external characters.