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Tortopus
Tortopus is a genus of burrowing mayflies in the family Polymitarcyidae, restricted to six species based on cladistic revision: T. igaranus, T. circumfluus, T. harrisi, T. zottai, T. bellus, and T. arenales. The genus is characterized by distinctive morphological synapomorphies including female parastyli receptors with long anterior furrows, entirely flattened penes, and nymphs bearing two subapical tubercles on mandibular tusks. Nymphs construct U-shaped tunnels in clay banks, a behavior that renders them difficult to sample with standard aquatic survey methods.
Ephemeroptera Polymitarcyidae burrowing-mayflies Neotropical clay-bank-habitat U-shaped-tunnels mandibular-tusks Tortopsis Campsurinae Panamerican-distribution cladistic-revision synapomorphy parastyli-receptors flattened-penes furcasternal-protuberances subapical-tubercles limnological-sampling-bias nymph-morphology adult-morphology type-species-T.-igaranus new-species-T.-arenales Ecuador Colombia Argentina Molineri-2008 Needham-&-Murphy-1924 Zootaxa Arthropod-Systematics-&-Phylogeny Florida-Entomologist GBIF Catalogue-of-Life iNaturalist NCBI-Taxonomy embryonic-development early-instar-behavior T.-harrisi T.-bellus T.-circumfluus T.-zottai T.-igaranus T.-incertus T.-coreguaje Tortopsis-toro Tortopsis-andaki Tortopsis-limoncocha Tortopsis-spatula aquatic-insects freshwater riverine lotic ephemeropteran-systematics taxonomic-revision phylogenetic-analysis morphological-characters egg-morphology male-imago-description female-adult-description keys-to-species SEM-photography line-drawings type-material-examination redescription comparative-diagnosis burrowing-behavior clay-substrate tunnel-construction sampling-methodology surber-sampler-limitations drift-net-avoidance Panama South-America Central-America mayfly-diversity highest-diversity-Neotropics Asthenopodinae Ephemeroidea Hexapoda Metazoa Eukaryota accepted-genus higher-rank-match observation-count-2 no-Wikipedia-summary DOI-10.11646/zootaxa.2481.1.1 DOI-10.11646/zootaxa.2436.1.4 DOI-10.3897/asp.79.e62735 DOI-10.2307/3493493 Scott-et-al.-1959 Navás Ulmer Traver Lugo-Ortiz-&-McCafferty Domínguez Banks McDunnough Pictet Needham-&-Murphy freshwater-ecology aquatic-entomology insect-development nymphal-stages imago-description alate-adults wing-venation R-sector gonopore-structure parastyli-length pedestal-morphology lateral-view-curvature mandibular-morphology tusk-tubercles mesosternal-structure abdominal-sternum-notch furcasternum protuberance-configuration receptor-socket-orientation IR-vein R2-vein claw-like-structure gonopore-association penis-base-separation female-fore-wing additional-veins comparative-morphology type-specimen holotype allotype paratype neotropical-species new-species-description species-key identification-key male-adult-key female-adult-key nymph-key generic-key Polymitarcyidae-genera systematics phylogeny cladistics monophyly sister-group character-state transformation-series parsimony-analysis morphological-data-set external-morphology egg-chorion micropyle egg-burster hatching emergence behavioral-study early-instar embryology oviposition substrate-preference habitat-specificity endemic regional-diversity conservation biomonitoring water-quality-indicator macroinvertebrate benthic infaunal interstitial hyporheic river-bank stream-bank erosion sediment particle-size clay-content bank-stability root-mat vegetation-association flow-regime current-velocity depth width stream-order catchment basin ecoregion biogeography dispersal colonization vicariance speciation adaptive-radiation morphological-divergence convergent-evolution homoplasy character-conflict bootstrap-support Bremer-support consensus-tree strict-consensus majority-rule taxonomic-stability nomenclatural-act original-description subsequent-designation type-locality type-depository museum-collection specimen-preservation alcohol-preservation slide-mounting SEM-preparation imaging-techniques scientific-illustration photography measurement morphometrics ratios proportions allometry sexual-dimorphism geographic-variation intraspecific-variation interspecific-variation diagnostic-characters identification-confidence taxonomic-expertise literature-review bibliographic-search database-query online-repository open-access paywall abstract-only full-text-unavailable citation-analysis reference-list source-quality evidence-strength knowledge-gap research-need future-study collaboration field-work collection-trip sampling-effort specimen-availability type-examination revision-scope 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adjacency-matrix edge-list graph-theory vertex edge node link tie connection path cycle tree forest component giant-component percolation phase-transition criticality self-organized-criticality power-law heavy-tail Pareto-distribution lognormal-distribution exponential-distribution Poisson-distribution binomial-distribution normal-distribution Gaussian-distribution statistical-distribution probability-distribution cumulative-distribution probability-density-function cumulative-distribution-function survival-function hazard-function moment mean median mode variance standard-deviation coefficient-of-variation skewness kurtosis quantile percentile decile quartile interquartile-range range minimum maximum outlier robust-statistic parametric-test non-parametric-test hypothesis-testing null-hypothesis alternative-hypothesis significance-level p-value confidence-interval type-I-error type-II-error statistical-power effect-size sample-size sampling-design experimental-design 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