What Is the Number 16 Spider and Why It Matters
The Number 16 spider refers to an individual funnel-web spider (Atrax or Hadronyche sp.) famously tracked in long-term ecological research in Australia. Over its monitored lifespan, this single spider accumulated a count of 16 documented predation or web-repair events, providing researchers with repeated behavioral data. Unlike transient specimens, Number 16 offered scientists a rare opportunity to observe the same spider across seasons, linking survival strategies to climate, prey availability, and habitat change. Its ongoing profile remains a useful reference for understanding funnel-web ecology and long-term invertebrate monitoring methods.
Species Profile and Identification
Taxonomy and Common Names
Number 16 belongs to a large mygalomorph lineage often called funnel-web spiders, though not all species within this group are medically significant. In research literature, it may belong to genera such as Atrax or Hadronyche, families including Actinopodidae or Hexathelidae depending on revision. Common names vary regionally, including tree funnel-web and alpine funnel-web, but local field guides and museum authorities should be consulted for precise identification in specific locations.
Morphological Traits
Funnel-web spiders typically display a robust, glossy build with dark coloration, capable leg spans around several centimeters, and prominent fangs. Sexual dimorphism is evident, with males often venturing during humid to wet conditions in search of mates and showing slightly more slender pedipalps. Juveniles resemble smaller adults, making long-term individual recognition feasible through markings and body proportions.
Habitat and Geographic Range
Number 16 inhabited a mosaic of eucalypt woodland, riparian buffers, and regenerating scrub in southeastern Australia. Funnel-web microhabitats include sheltered crevices, rotting logs, and soil cracks, with retreat webs oriented to capture ground and climbing prey. Environmental variables such as soil moisture, leaf litter depth, and understory density strongly influence site fidelity and seasonal activity patterns.
Microclimate Preferences
- High humidity nights correlated with increased foraging and web maintenance.
- Stable substrate temperature and moisture buffered extreme heat events.
- Vegetation structure provided windbreaks and hunting perches.
Behavior, Ecology, and Lifecycle
Foraging and Web Dynamics
As a sit-and-wait predator, Number 16 relied on tension-sensitive threads to detect arthropod contact, triggering rapid retreat and envenomation. Web repair cycles aligned with feeding frequency, with documented events peaking during warm, wet intervals when insect activity surged. Displacement experiments in the study area confirmed site fidelity, indicating strong microhabitat optimization over time.
Reproduction and Development
Males typically reached maturity in later instars, undertaking nocturnal search phases guided by chemical cues. Eggs were housed in silken sacs within retreats, with hatchlings emerging synchronously after rainfall cues. Juveniles exhibited dispersal via ballooning, establishing new populations in adjacent suitable patches and contributing to regional genetic connectivity.
Notable Events in the Number 16 Record
During extended monitoring, researchers logged 16 distinct noteworthy interactions, including web construction, prey capture, predator deterrence, and maintenance episodes. Each event was geo-tagged, dated, and cross-referenced with weather and habitat metrics. These records formed a longitudinal dataset supporting analyses of individual fitness, survival probability, and microclimate response.
Fact Summary in Tabular Format
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Individual ID | Number 16 (funnel-web, monitored) | Field Log |
| Count of Documented Events | 16 | Observer Records |
| Primary Study Region | Southeastern Australia (woodland/riparian) | Research Paper |
| Typical Body Size | Approx. 3–5 cm leg span (adult) | Morphological Survey |
| Key Behavior | Funnel-web construction and sit-and-wait predation | Ethogram |
| Monitoring Period | Multi-season, long-term tracking | Field Dataset |
Ecological Role and Conservation Context
Number 16 contributed to natural pest regulation, controlling insect populations that influence understory and canopy dynamics. Funnel-web spiders also serve as prey and indicators, reflecting habitat quality and pollutant exposure. Although not considered threatened as a species, localized habitat loss and climate extremes can affect individual survival, underscoring the value of long-term studies like the one documenting Number 16.
Practical Observations and Safety Notes
Observers should maintain distance and avoid handling, relying on remote monitoring and photography. Habitat conservation that retains ground cover, moisture gradients, and structural complexity supports funnel-web populations and other invertebrates. Public education reduces unwarranted fear and promotes coexistence, emphasizing that most encounters are non-aggressive when left undisturbed.
FAQ
Reader questions
Is the Number 16 spider a distinct species or just a named individual?
Number 16 is an individually tracked funnel-web spider, not a separate species. The designation is a research ID used to analyze survival, behavior, and microclimate relationships over time.
What does the number 16 refer to in this context?
It reflects 16 documented events, such as web checks, prey captures, or maintenance episodes, recorded across seasons during long-term field monitoring.
Are funnel-web spiders dangerous to humans?
Certain funnel-web species can pose medical risks, though many are not hazardous. Respectful distance and proper identification are advised; this profile focuses on ecological data rather than medical guidance.
How are spiders like Number 16 monitored without disturbing them? Researchers use remote cameras, mark-recapture techniques, web mapping, and environmental sensors to minimize disturbance while collecting robust behavioral data. Why is long-term individual tracking valuable?
Longitudinal data from individuals like Number 16 improve understanding of survival strategies, reproductive success, and responses to environmental change, informing conservation and habitat management.