Phacopida is represented by a Siluro-Devonian Phacopidae morphology and ontogeny study plus a systematic review; the classification remains a sampled, revisable order-level hypothesis.
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Siluro-Devonian phacopid morphology and ontogeny provide an explicit worked sample for diagnosing species within Phacopida. The study samples Phacopidae and neither revises every phacopid lineage nor fixes order-wide temporal endpoints.
claim:taxon:phacopidaCrônier et al. use morphological and ontogenetic characters to delimit Siluro-Devonian Phacopidae species; these observations are a bounded family sample, not universal phacopid anatomy.
claim:taxon:phacopida:morphologyThe former 488-359 Ma Phacopida display is withheld because the available primary study treats Siluro-Devonian Phacopidae rather than an order-wide first and last occurrence synthesis; no numerical global range is assigned here.
claim:taxon:phacopida:fossil-rangeCrônier et al. document Siluro-Devonian Phacopidae material and ontogenetic series, while Fortey reviews sampled trilobite systematics; these records are regional and taxon-sampled rather than a complete geographic distribution of Phacopida.
claim:taxon:phacopida:biogeographyThe cited phacopid taxonomy studies focus on morphology, ontogeny and classification, not diet, habitat use, locomotor performance, body size or ecological guild; those fields remain unassigned for Phacopida here.
claim:taxon:phacopida:ecology