Callirhipidae

Emden, 1924

Callirhipid Cedar Beetles, Cedar Beetles

Genus Guides

Zenoa

is a of elateriform beetles containing approximately 175 valid in 10 . The family is distributed throughout low-latitude regions worldwide, with notable absence from tropical Africa and Madagascar. The only North American representative is Zenoa picea, found across the eastern and central United States. Larvae develop in decaying hardwood, particularly oak and hickory, with a two-year . are generally and attracted to lights.

Zenoa picea by (c) David Dodd, some rights reserved (CC BY), uploaded by David Dodd. Used under a CC-BY license.

Zenoa picea P1190972a by
xpda. Used under a CC BY-SA 4.0 license.

Zenoa picea P1450928a by
xpda. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Callirhipidae: /ˌkælɪˈraɪpɪˌdiː/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

can be recognized by their elongated, somewhat flattened bodies with serrate or pectinate . Zenoa picea, the sole North American , is distinguished by its dark coloration with reddish or orange markings. Larvae are scarabaeiform (C-shaped, fleshy, with reduced legs) and found in decaying wood galleries.

Images

Habitat

Forest with decaying hardwood logs. In North America, specifically associated with moist, decomposing wood of fallen oak (Quercus) and hickory (Carya) trees. Larvae inhabit galleries within the decaying wood substrate.

Distribution

Widely distributed through low-latitude regions globally except tropical Africa and Madagascar. In the United States, Zenoa picea occurs from Florida to New York, west to Missouri, Arkansas, Iowa, and Texas. Documented from 26 states and the District of Columbia.

Seasonality

of Zenoa picea active from May to July based on collection records.

Diet

Larvae feed on decaying hardwood wood, specifically decomposing tissue of oak and hickory. The is saproxylophagous, contributing to wood decomposition.

Host Associations

Quercus - larval oak, primary for Zenoa picea
Carya - larval hickory, primary for Zenoa picea
Celtis laevigata - potential larval sugarberry, reported but less certain for Zenoa picea

Life Cycle

Larval development spans approximately two years, inferred from field collections showing multiple instars co-occurring. stages: , larva (three instars), pupa (exarate, adecticous), and . occurs within the wood substrate.

Behavior

are and strongly attracted to lights. Larvae construct galleries in decaying wood and remain within the substrate until . Adults may be found on tree trunks near larval development sites.

Ecological Role

Decomposers in forest . Larvae contribute to breakdown of decaying hardwood logs, facilitating nutrient cycling and wood decomposition. Part of the saproxylic dependent on dead wood .

Human Relevance

Minimal direct human relevance. Occasionally encountered by entomologists and naturalists through blacklight surveys. Not known as agricultural or forest pests.

Similar Taxa

CerambycidaeLonghorn beetles also have wood-boring larvae and elongated bodies, but differ in having or clubbed rather than serrate/pectinate forms, and larvae are typically more cylindrical rather than scarabaeiform
BuprestidaeJewel beetles share metallic coloration in some and wood-associated larvae, but have short, serrate and larvae are dorsoventrally flattened with distinct thoracic segments, unlike the scarabaeiform larvae

More Details

Taxonomic History

The was established by Emden in 1924. The Zootaxa catalogue (2011) recognized 10 valid : Brachyrrhipis, Callirhipis (with subgenera Callirhipis, Ennometidium, Helleriola, Parennometes), Celadonia, Ennometes, Ptorthocera, Simianus, and Zenoa. The family has undergone significant nomenclatural revision, with numerous new combinations and synonymies proposed in recent decades.

Larval Morphology

Zenoa picea larvae are scarabaeiform with well-developed bearing a single conical , three-segmented legs with two claws, and distinctive abdominal segments with ampullae and cribriform . These features distinguish them from larvae of related .

Conservation Status

No in the are currently listed as threatened or endangered. However, as saproxylic organisms dependent on dead wood , may be affected by forest management practices that remove coarse woody debris.