Specialized-predator
Guides
Aphilanthops hispidus
ant-queen kidnapper
Aphilanthops hispidus is a solitary wasp species in the family Crabronidae, known as an "ant-queen kidnapper" for its specialized predation on winged queens of ants in the genus Formica. The species occurs in North America, including the southwestern United States and Mexico, and has been documented as abundant on flowers of seepwillow (Baccharis salicifolia) during late summer months. Adult females excavate underground burrows to store paralyzed ant queens as food for their developing larvae.
Cremastocheilus mexicanus
Anteater scarab beetle
Cremastocheilus mexicanus is a myrmecophilous scarab beetle in the tribe Cremastocheilini. The species is part of a genus of approximately 35 North American species known as 'anteater scarabs' for their specialized predatory relationship with ants. Adults and larvae inhabit ant colonies where they feed on ant brood, exhibiting remarkable morphological and behavioral adaptations for this lifestyle. The species occurs in the southwestern United States and northern Mexico.
Cremastocheilus puncticollis
anteater scarab beetle
Cremastocheilus puncticollis is a species of anteater scarab beetle in the family Scarabaeidae. Like other members of the genus Cremastocheilus, this species is a specialized myrmecophile that lives within ant colonies. The species is found in the southwestern United States, specifically in Arizona and California. Adults are predators of ant larvae and pupae, employing remarkable behavioral and morphological adaptations to infiltrate and survive within hostile ant nests.
Cychrus tuberculatus
tuberculate rare snail-eating beetle
Cychrus tuberculatus is a species of ground beetle in the subfamily Carabinae, commonly known as the tuberculate rare snail-eating beetle. First described by T.W. Harris in 1839, this species is notable for its specialized diet of snails and its brachypterous (short-winged), nocturnal adults. It inhabits coniferous forests, forest clearings, and moraines in western North America, with documented populations in British Columbia, Quebec, California, Oregon, and Washington. The species is considered rare and has specific habitat requirements tied to forested environments.
Dysdera crocata
Woodlouse Spider, Woodlouse Hunter, Sowbug Hunter, Sowbug Killer, Pillbug Hunter, Slater Spider
Dysdera crocata is a specialized spider predator native to the Mediterranean region of Europe that has become established worldwide through human commerce. It is the only representative of the family Dysderidae in North America. Despite its formidable appearance—featuring disproportionately large chelicerae and long fangs—it poses no significant danger to humans. The species has been the subject of recurring internet hoaxes falsely claiming it is a new, deadly spider. It is primarily nocturnal and strongly associated with human-modified environments, particularly where its woodlouse prey abounds.
Harpaphe haydeniana
yellow-spotted millipede, almond-scented millipede, cyanide millipede
Harpaphe haydeniana is a flat-backed millipede native to the Pacific coast of North America, recognized by its black body with yellow-tipped lateral keels. The species is notable for its chemical defense system, secreting hydrogen cyanide when threatened, which produces a characteristic almond odor. It plays a significant role in forest decomposition, particularly in redwood ecosystems. Despite its common names suggesting uniqueness, both the color pattern and cyanide defense occur in other flat-backed millipedes globally.
Mastophora hutchinsoni
American bolas spider, Cornfield Bolas Spider
Mastophora hutchinsoni is a bolas spider in the orb-weaver family Araneidae, notable for its highly specialized hunting strategy that abandons the typical orb web in favor of a single adhesive droplet on a silk thread. Adult females use aggressive chemical mimicry to attract male moths by releasing species-specific sex pheromone blends, then capture prey by swinging this 'bolas' at hovering moths. The species exhibits extreme sexual dimorphism, with females developing into large, globular spiders while males remain small and retain juvenile hunting behaviors. It occurs throughout eastern North America and has been extensively studied in Kentucky populations.
Mastophora leucabulba
Mastophora leucabulba is a bolas spider in the orb-weaver family Araneidae. Adult females hunt using a single sticky silk droplet suspended from a dragline rather than building an orb web. Males and juvenile females lack this specialized hunting method and capture prey directly with their legs. The species occurs from the United States to Honduras.
Methocha stygia
ant-like wasp, tiger beetle parasitoid wasp
Methocha stygia is a specialized parasitoid wasp in the family Tiphiidae that exhibits remarkable ant-mimicry (myrmecomorphy) in both morphology and behavior. This species targets tiger beetle larvae (Cicindelidae) as its exclusive host, employing a distinctive hunting strategy where females aggressively engage their prey and deliberately allow themselves to be grasped by the larva's sickle-shaped mandibles to gain entry to the burrow. The wasp's ant-like appearance enables it to approach host burrows without triggering the defensive responses that tiger beetle larvae typically direct against conventional wasp predators.
Mimetus
Pirate spiders, Cannibal spiders
Mimetus is a genus of pirate spiders in the family Mimetidae, comprising approximately 71 species distributed worldwide. These small arachnids (3–7 mm body length) are obligate spider predators, employing specialized hunting tactics to infiltrate webs of other spiders and kill them through leg bites. They exhibit distinctive morphology including globular abdomens with curved bristle-like hairs and elongated anterior legs. The genus is recognized for its ecological role as an intraguild predator and its convergent resemblance to comb-footed spiders (Theridiidae).
Mimetus puritanus
Common Pirate Spider, Pirate Spider
Mimetus puritanus is a small araneophagous spider in the family Mimetidae, commonly known as the Common Pirate Spider. It is the most frequently encountered pirate spider species in the eastern United States. Unlike web-building spiders, M. puritanus infiltrates the webs of other spiders—particularly cobweb weavers and orb weavers—to prey upon them. The species exhibits specialized predatory adaptations including fused jaws that restrict gape width, leading it to attack prey spiders by biting their legs sequentially. Adults measure 3–7 mm in body length and are primarily nocturnal.
Nephaspis oculatus
eyed lady
Nephaspis oculatus is a small coccinellid beetle specialized as a predator of whitefly eggs. Under laboratory conditions at 26°C, development from egg to adult averages 22.7 days. The species exhibits highly specific feeding behavior, consuming only eggs of Bemisia argentifolii and rejecting nymphal and adult stages. Both larvae and adults are predatory, with consumption increasing through larval instars. The species has been evaluated for biological control potential against silverleaf whitefly in agricultural systems.
Nomamyrmex esenbeckii
Nomamyrmex esenbeckii is a species of army ant in the subfamily Dorylinae. It is one of the largest army ant species and is known for its specialized predatory behavior. The species is distributed across much of South America, with records from Brazil, Colombia, and other countries. It is recognized as a specialized predator of other ants, particularly Atta leafcutter ants.
Ozaena lemoulti
Ozaena lemoulti is a carabid beetle in the subfamily Paussinae with an obligate myrmecophilous lifestyle across all life history stages. Molecular gut content analysis confirms that adults exclusively prey on Camponotus ants, using specialized piercing-sucking feeding behavior rather than typical carabid crushing. First instar larvae are morphologically modified for life within ant nests, possessing long running legs and lacking the burrow-dwelling adaptations found in other ozaenines. This species represents an independent evolutionary origin of myrmecophily within Paussinae, distinct from the tribe Paussini.
Proceratium croceum
Proceratium croceum is a small, cryptic ant species in the subfamily Proceratiinae. It belongs to a genus of specialized predators that exhibit unusual foraging behaviors. The species is known from limited observations in the eastern United States. Like other Proceratium species, it likely possesses a distinctive elongated petiole and modified mandibles for capturing specific prey.
Scaphinotus ridingsii monongahelae
Scaphinotus ridingsii monongahelae is a subspecies of ground beetle in the family Carabidae, described by Leng in 1917. It belongs to the genus Scaphinotus, commonly known as snail-eating beetles or snail hunters, which are specialized predators of terrestrial snails. The subspecies epithet "monongahelae" suggests an association with the Monongahela River region of the eastern United States. Like other members of the tribe Cychrini, this beetle possesses enlarged, asymmetrical mandibles adapted for extracting snails from their shells.
Scytodes longipes
Long-legged Spitting Spider
Scytodes longipes is a tropical spitting spider distinguished by its long legs and specialized prey-capture behavior. Unlike short-legged Scytodes species that are ground-dwelling hunters, this species constructs tangled, sheet-like webs similar to cellar spiders (Pholcidae). It has been introduced well beyond its native range, establishing populations on Pacific Islands, in Africa, Southeast Asia, and Australia. The species is notable for its communal tendencies and unique spitting mechanism that immobilizes prey with adhesive venom.
Stenolemus longicornis
Stenolemus longicornis is a thread-legged assassin bug in the subfamily Emesinae. It is notable as a specialized predator of web-building spiders, exploiting the host's own webs to capture prey. The species exhibits the elongated, slender body form characteristic of the subfamily. Its life history and ecology are closely tied to spider web microhabitats.
Stigmatomma oregonense
Western Dracula Ant
Stigmatomma oregonense is a species of Dracula ant in the subfamily Amblyoponinae, native to western North America. It is a specialized predator known to hunt centipedes. The species was first described by Wheeler in 1915 and has been maintained in live colonies for public display and research. Like other members of its genus, it exhibits predatory behaviors characteristic of the Amblyoponinae.