Glyptotus cribratus

LeConte, 1858

Glyptotus cribratus is a North American darkling beetle in the Stenochiinae. The develops in soft, rotten, dry wood of dead branches on living trees or recently fallen sections. Its larvae possess distinctive caudal armature used in antipredator defense. The species has been documented from the southeastern United States, with confirmed records from Florida, Georgia, North Carolina, and South Carolina.

Pronunciation

How to pronounce Glyptotus cribratus: /ɡlɪpˈtoʊtəs kraɪˈbreɪtəs/

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Identification

Larvae recognized by pale yellowish-white coloration with light brown bands, mature length 23–30 mm, and distinctive urogomphi (caudal appendages) that can be raised and curved forward to contact bullae on VIII, forming a pinching organ. Pupa white with brownish surface setae, approximately 15.1 mm. require rearing from larvae for reliable identification; identity confirmed by association of adults with larval and pupal in pupal .

Habitat

Forested regions, specifically soft rotten dry wood of dead branches on living trees or in sections recently fallen from them; includes maritime forest, open pine-oak sand scrub, and mixed scrub forest burned approximately one year prior.

Distribution

Southeastern United States: Florida (Highlands County), Georgia (Camden County, Little Cumberland Island), North Carolina (Dare County, Kill Devil Hills), South Carolina (Dillon County); also recorded from southern Texas and potentially northeastern Mexico.

Seasonality

observed in October; recorded in late April.

Host Associations

  • Quercus virginiana - larval development in dead woodlive oak
  • Quercus falcata - larval development in dead woodsouthern red oak
  • Quercus laevis - larval development in dead woodturkey oak

Life Cycle

Complete . Larval development occurs within rotten wood. Mature larvae construct pupal containing associated . One reared specimen emerged as in October 2003 from larva collected April 2003; another pupated 25 April 2007 and was preserved 1 May 2007.

Behavior

Larvae exhibit antipredator defense using urogomphi: at rest, these caudal appendages curve dorsally with sharp apices pointing anteriorly; when raised, they contact defensive structures (bullae) on the preceding tergite to form a pinching organ. Similar defensive structures noted in pupae.

Ecological Role

Saproxylic insect contributing to decomposition of dead wood in forest .

Similar Taxa

  • Cibdelis blaschkeiShares ecological and behavioral similarities including saproxylic in rotten wood and antipredator defensive structures; distinguished by morphological differences in larval and pupal armature

Sources and further reading