Zatypota

Members of Zatypota can be distinguished from other polysphinctine genera by their association with theridiid host spiders and the characteristic cocoon web architecture induced in hosts. Adults are small to medium-sized ichneumonids with the typical slender body form of Pimplinae. Species-level identification requires examination of morphological characters including wing venation, antennae structure, and coloration patterns; regional keys are available for Japan and other areas.

Associated with habitats supporting their spider hosts, including forests, human dwellings, and vegetation where theridiid spiders construct webs. In Finland, Z. kerstinae has been collected from old Norway spruce forests by beating lower branches.

Holarctic distribution with records from Europe (including Scandinavia, Czech Republic, Italy), Asia (Japan, Indonesia, Russia), and the Americas (Brazil, North America). The genus has been recorded from both Northern and Southern Hemispheres.

Varies by species and latitude. Z. percontatoria in the Czech Republic produces an estimated 3.5 generations per year with adults emerging in early May. Z. albicoxa is multivoltine in northern Japan with adults emerging mid-May. Z. kerstinae in Finland appears to be univoltine.

• Theridiidae (cobweb spiders) - primary host familyMost Zatypota species parasitize theridiid spiders including Achaearanea, Anelosimus, Parasteatoda, Theridion, and Cryptachaea species
• Linyphiidae (sheet-web weavers) - hostZ. sulcata in Japan parasitizes linyphiid spiders
• Araneidae (orb-weavers) - hostZ. riverai has been documented parasitizing Cyclosa fililineata

Koinobiont ectoparasitoid development: eggs are laid on the spider abdomen (rarely prosoma), larvae remain attached to the host through multiple instars using chorion remains and a rigid brownish membrane called a saddle. Second instar larvae are particularly notable for this attachment mechanism. Larvae overwinter attached to hosts in some species. Development time varies: 9 days in Z. anomala and Z. riverai, 12 days in Z. baezae and Z. mulunguensis, with temperature-dependent rates up to 28°C. Pupation occurs in a cocoon, often within the modified cocoon web constructed by the manipulated host spider.

Induces profound behavioral manipulation in host spiders, causing them to construct specialized cocoon webs that differ architecturally from normal prey-capture webs. In theridiids, this often involves simplification to strong cable-like structures; in orb-weavers, increased complexity at specific locations. The manipulation appears to involve activation or retention of specific web-building subroutines rather than reproductive or juvenile behaviors. Oviposition behavior includes ambush-style (hanging on web threads until spider lifts wasp) and climbing-style approaches; Z. albicoxa exhibits a unique dorsum-lying behavior to entice hosts. Females assess host size to determine sex allocation, with larger hosts receiving female eggs and smaller hosts male eggs.

Primary parasitoid in spider communities, potentially influencing spider population dynamics and web architecture evolution. Serves as intermediate host for hyperparasitoid chalcidid wasps (e.g., Conura baturitei), forming three-level parasitoid chains. The behavioral manipulation of hosts represents a striking example of extended phenotype evolution.

Z. albicoxa parasitizes the common house spider Parasteatoda tepidariorum, bringing this genus into synanthropic environments. The complex host manipulation has made Zatypota a model system for studying parasitoid behavioral ecology and extended phenotypes.

• HymenoepimecisAlso polysphinctine parasitoids of spiders that induce cocoon web construction; distinguished by host range and specific web architecture modifications
• ReclinervellusRelated polysphinctine genus with similar host manipulation; distinguished by taxonomic placement and specific morphological characters
• SchizopygaShares egg expulsion from abdominal tip rather than ovipositor tip; distinguished by host associations and geographic distribution

• parasitoid
• spider parasitoid
• behavioral manipulation
• polysphinctine
• cocoon web
• extended phenotype
• host manipulation
• ectoparasitoid
• koinobiont
• sex allocation
• hyperparasitism

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Life history of the spider parasitoidZatypota percontatoria(Hymenoptera: Ichneumonidae)
• Lying on the dorsum: unique host-attacking behaviour of Zatypota albicoxa (Hymenoptera, Ichneumonidae)
• Conura baturitei sp. nov. (Hymenoptera: Chalcididae): a hyperparasitoid of spiders through Zatypota riverai (Hymenoptera: Ichneumonidae)
• Two new species of Zatypota (Hymenoptera: Ichneumonidae, Pimplinae) sharing the same host spider in Northeast Brazil
• Modificación comportamental de la araña Cryptachaea jequirituba (Araneae: Theridiidae) inducida por el parasitoide Zatypota alborhombarta (Hymenoptera: Ichneumonidae)
• Descriptions of the Final Instar Larvae of Perithous septemcinctorius, Zatypota bohemani and Z. gracilis (Hymenoptera: Ichneumonidae: Pimplinae)
• Oviposition behavior of Zatypota albicoxa (Hymenoptera, Ichneumonidae), an ectoparasitoid of Achaearanea tepidariorum (Araneae, Theridiidae)
• Seasonal Life Cycle ofZatypota albicoxa(Hymenoptera: Ichneumonidae), an Ectoparasitoid ofParasteatoda tepidariorum(Araneae: Theridiidae), in Southwestern Japan
• Behavioral manipulation of a “Trashline Orb-weaving spider” Cyclosa fililineata (Araneidae) by the parasitoid wasp Zatypota riverai (Ichneumonidae: Pimplinae)
• Natural history and description of Zatypota kerstinae sp.nov. (Hymenoptera: Ichneumonidae) reared from Theridion palmgreni Marusik et Tsellarius (Araneae: Theridiidae) in Finland
• Host behavior modification of Achaearanea tingo (Araneae: Theridiidae) induced by the parasitoid wasp Zatypota alborhombarta (Hymenoptera: Ichneumonidae)
• A new record of Zatypota albicoxa (Hymenoptera: Ichneumonidae) from Indonesia, with description of a new species of its host spider (Araneae: Theridiidae)
• A revision of the genus Zatypota Förster of Japan, with descriptions of nine new species and notes on their hosts (Hymenoptera: Ichneumonidae: Pimplinae)
• Seasonal life cycle of Zatypota albicoxa (Hymenoptera: Ichneumonidae), an ectoparasitoid of Achaearanea tepidariorum (Araneae: Theridiidae), in northern Japan
• First record from Italy of Zatypota anomala (Ichneumonidae, Ephialtini), a parasitoid of the cribellate spider Dictyna pusilla (Araneae, Dictynidae)