Specimen-identification defense
Use approved published figures or instructor-approved prepared specimens to identify supported traits, explain structure and function, and follow a supplied dichotomous key. The inland image pathway requires the same classification reasoning, but is not a field/practical credential and cannot certify an unobserved practical skill. No wild-animal handling or collection is assigned. Publish the available evidence, permitted references and accommodations before the demonstration.
Preparation: algal and seagrass structures, invertebrate trait cards and life stages, and fish structure and osmoregulation. State when a figure lacks evidence for a lower taxonomic rank rather than guessing. Follow the approved preparation boundaries.
| Criterion | Developing | Proficient | Mastery |
|---|---|---|---|
| Identification & dichotomous key | Names specimens by guesswork and cannot work a dichotomous key. | Reaches an ID for obvious specimens but stalls on a key, or skips the confirming feature. | Identifies each specimen, working a dichotomous key couplet by couplet where needed, and names the feature that clinched it. |
| Structure–function reasoning | Describes a body part but cannot say what it does or why it matters. | Links some structures to a function but treats adaptations as a list of facts. | Explains how each key structure serves the animal — a shark’s countershading, a sea star’s tube feet, a fish’s gills — tying form to the life it makes possible. |
| Classification & taxonomy placement | Guesses a name without diagnostic evidence. | Places a broad group but confuses phylum and class. | Justifies the lowest rank the evidence and key support, distinguishes phylum from class, and explicitly retains uncertainty where traits are missing. |
| Evidence handling & observed tool use | Invents observed traits or disregards the approved evidence pathway. | Uses a figure/key but loses orientation or source context. | Keeps figures/specimens oriented and source-labeled and uses the key correctly. Practical hand-lens, microscope or prepared-specimen handling is recorded only when approved and actually observed, separately from image analysis. |
| Defense under questioning | Recites a label that does not fit the evidence. | Supports the initial ID but needs help with a changed case. | Explains a fresh follow-up from traits and mechanisms using the agreed accessible response format; confidence and speaking speed do not determine the grade. |
Integration is reported separately and cannot lower the science grade or block a science demonstration pass. Science and practical criteria determine that pass. Before assessment, publish the target list, task, permitted references, timing, and accommodations. Assess scientific reasoning and safe technique, not confidence or speaking speed.
“This one’s an echinoderm — five-fold symmetry, tube feet on the underside, no head. The tube feet grip prey and pry open bivalves, which is how a sea star feeds. The key took me from ‘radial symmetry’ to Asteroidea, so it’s a sea star, not a brittle star — the arms are thick and join a wide central disc.”
“It’s got arms, so it’s like a starfish? I don’t really know what group it’s in. It just looks like an ocean animal.”
Assess the learner's evidence trail, reasoning and fresh transfer, not recitation or appearance of confidence. Use labeled published figures for inland learners; only a separately approved and observed practical can establish specimen or tool-handling proficiency. Integration cannot lower the science grade or block a science demonstration pass.