Difficult-identification
Guides
Acmaeodera quadriseriata
Acmaeodera quadriseriata is a jewel beetle (family Buprestidae) described by Fall in 1899. It belongs to the large North American genus Acmaeodera, which contains approximately 150 species and is in need of taxonomic revision. The species is part of the morphologically similar 'tubulus-species group' characterized by small size (<8 mm), black coloration with yellow elytral maculations, and membership in the 'Truncatae' group. Identification of this and related species is difficult due to inadequate original descriptions and lack of modern identification keys.
Apamea
Cutworm moths, Rustic shoulder-knot moths
Apamea is a genus of moths in the family Noctuidae, commonly known as cutworm moths or rustic shoulder-knot moths. The genus contains numerous species that are typically medium-sized with cryptic, mottled forewings in shades of brown, gray, and ochre. Several species are significant agricultural pests, with larvae feeding on cereal crops and grasses. Species-level identification is notoriously difficult due to extensive individual variation and overlapping morphological features.
Apamea geminimacula
A medium-sized noctuid moth in the cutworm genus Apamea. The species was described by Dyar in 1904 and occurs in North America and Middle America. Like other Apamea species, it is difficult to identify due to individual variation and overlapping morphological traits with congeners.
Apamea lintneri
sand wainscot moth, Sand Wainscot
Apamea lintneri, commonly known as the sand wainscot moth, is a noctuid moth native to North America. First described by Augustus Radcliffe Grote in 1873, this species is listed as a species of special concern in Connecticut. As a member of the genus Apamea, it belongs to a group of cutworm moths known for being difficult to identify due to individual variation and overlapping appearances with congeners.
Apamea vulgaris
Common Apamea Moth, common apamea
Apamea vulgaris, commonly known as the Common Apamea Moth, is a noctuid moth found in eastern and central North America. Adults are active from May to July and have a wingspan of approximately 39 mm. The species belongs to the cutworm moth genus Apamea, a group known for being difficult to identify due to individual variation and overlapping morphological features among closely related species.
Apamea xylodes
Apamea xylodes is a cutworm moth species in the family Noctuidae, described by Mikkola and Lafontaine in 2009. As a member of the genus Apamea, it belongs to a group of noctuid moths that are notoriously difficult to identify due to individual variation and overlapping morphological characteristics with congeners. The species is known from North America, though specific details about its biology and ecology remain limited.
Athous excavatus
Athous excavatus is a click beetle species in the family Elateridae. It is a European species associated with woodland and forest habitats. Adults are active during spring and summer months. The species is part of the diverse Athous genus, which contains numerous similar-looking species that require careful examination for identification.
Chrysobothris chrysoela chrysoela
A subspecies of jewel beetle in the family Buprestidae. Members of the species Chrysobothris chrysoela occur in Florida and are associated with oak habitats. The subspecies is part of a genus containing numerous economically important wood-boring beetles, many of which are difficult to identify due to reliance on suites of subtle morphological characters rather than single diagnostic features.
Diplotaxis liberta
Diplotaxis liberta is a small scarab beetle in the family Scarabaeidae, subfamily Melolonthinae. The species occurs across eastern North America from Canada to the southeastern United States, with additional records from the Caribbean. Adults are nocturnal and have been observed aggregating on low vegetation, apparently to detect pheromone trails while searching for mates. Like other members of the genus Diplotaxis, this species is difficult to identify without examination of male genitalia.
Hystrichophora stygiana
A small tortricid moth in the leafroller family, described by Dyar in 1903. The genus Hystrichophora contains species that are challenging to identify to species level from photographs alone. Larval stages roll leaves for concealment, consistent with family traits.
Lasioglossum truncatum
Truncate Sweat Bee
Lasioglossum truncatum is a species of sweat bee in the family Halictidae, one of over 1,700 species in the genus Lasioglossum. Like other members of this large genus, it is a ground-nesting solitary bee. The species occurs in North America and has been documented in Vermont and other regions. As with many Lasioglossum species, detailed natural history information specific to L. truncatum is limited, though it shares general ecological traits with its congeners.
Phyllophaga aemula
May beetle, June beetle
Phyllophaga aemula is a species of scarab beetle in the family Scarabaeidae, commonly known as a May beetle or June beetle. It belongs to a large genus of over 400 species in North America, many of which are difficult to distinguish without examination of genitalia. Like other members of its genus, it has subterranean larval stages and aerial adults. The species was originally described as Lachnosterna aemula by Horn in 1887.
Phyllophaga errans
Phyllophaga errans is a species of scarab beetle in the genus Phyllophaga, commonly known as May beetles or June beetles. The genus contains over 400 species in North America, making it one of the most speciose beetle genera in the region. Species-level identification within Phyllophaga is notoriously difficult and typically requires examination of male and female genitalia. P. errans occurs in the western United States.
Phyllophaga renodis
Phyllophaga renodis is a species of scarab beetle in the genus Phyllophaga, commonly known as May beetles or June bugs. The genus Phyllophaga is one of the most species-rich genera in North America, with over 400 species. Species-level identification within this genus is notoriously difficult and typically requires examination of male and female genitalia. P. renodis is documented from Texas in the Nearctic region. Like other members of the genus, it likely has a subterranean larval stage feeding on plant roots and above-ground adults that feed on foliage.
Sarcophaga pleskei
flesh fly
Sarcophaga pleskei is a species of flesh fly in the family Sarcophagidae, first described by Rohdendorf in 1937. The genus Sarcophaga is characterized by larviparous reproduction (depositing live larvae rather than eggs) and association with decomposing organic matter. Species in this genus are morphologically similar and often require examination of male genitalia for definitive identification. Distribution records indicate presence in Norway and Sweden.
Stenodynerus fundatiformis
A small solitary mason wasp in the subfamily Eumeninae. The species is difficult to distinguish from related genera such as Parancistrocerus based on live specimens alone; microscopic examination is typically required for definitive identification. Females are known to provision nests with paralyzed caterpillars for their larval offspring. Males have been observed foraging on flowers, with the last antennal segment characteristically folded against the adjacent segment.
Sympetrum costiferum
Saffron-winged Meadowhawk
Sympetrum costiferum, the saffron-winged meadowhawk, is a small dragonfly in the skimmer family Libellulidae. It is distinguished by yellowish-brown to pale red abdomen coloration and distinctive saffron-colored wing stripes in juveniles and females. The species occurs across northern and central North America and is notably difficult to distinguish from closely related meadowhawk species.
Tanaostigma
Tanaostigma is a genus of minute parasitic wasps in the family Tanaostigmatidae, within the superfamily Chalcidoidea. The genus was established by Howard in 1890. Members of this family are characterized by tiny body size and reduced wing venation, making them difficult to distinguish from related chalcidoid families without detailed examination. The family Tanaostigmatidae is a small group within the diverse Chalcidoidea, which contains numerous families of parasitoid wasps.
Typocerus velutinus nobilis
Typocerus velutinus nobilis is a subspecies of the flower longhorn beetle T. velutinus, belonging to the subfamily Lepturinae. Adults are diurnal and visit flowers for feeding. The species is part of a complex of similar-looking Typocerus species that can be difficult to distinguish in the field. Based on the parent species, adults likely have distinct transverse yellow elytral bands and a continuous band of dense yellow pubescence along the basal margin of the pronotum.