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8 results for “statolith”
Figure 6 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 6. Comparison between squid statoliths at the same stage of maturity. (A) Doryteuthis plei; (B) Doryteuthis sanpaulensis. The bluish appearance of the D. sanpaulensis statolith is probably due to refractive properties, because it is more transparent than the D. plei statolith.
Figure 4 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 4. Morphometric values of the Doryteuthis plei statoliths into categories (M) males, (F) females, (I) immature, (II) maturing, (III) mature and (IV) spent by statolith measures (SL) statolith length, (DL) dome length, (ÂR) angle of the rostrum and (ÂD) angle of the dome.
Data from: Statolith morphometrics can discriminate among taxa of cubozoan jellyfishes
Identification of potentially harmful cubomedusae is difficult due to their gelatinous nature. The only hard structure of medusae, the statolith, has the potential to provide robust measurements for morphometric analysis. Traditional morphometric length to width ratios (L: W) and modern morphometric Elliptical Fourier Analysis (EFA) were applied to proximal, oral and lateral statolith faces of 12 cubozoan species. EFA outperformed L: W as L: W did not account for the curvature of the statolith. Best discrimination was achieved with Canonical Discriminant Analysis (CDA) when analysing proximal + oral + lateral statolith faces in combination. Normalised Elliptical Fourier (NEF) coefficients classified 98% of samples to their correct species and 94% to family group. Statolith shape agreed with currently accepted cubozoan taxonomy. This has potential to assist in identifying levels of risk and stock structure of populations in areas where box jellyfish envenomations are a concern as the severity of envenomation is family dependent. We have only studied 12 (27%) of the 45 currently accepted cubomedusae, but analyses demonstrated that statolith shape is an effective taxonomic discriminator within the Class.
Data from: Statolith morphometrics can discriminate among taxa of cubozoan jellyfishes
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Figure 5 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 5. Relationship between Doryteuthis plei SL (statolith length, in mm) and ML (mantle length, in mm) for (A) total sample, (B) males, (C) females, (D) immature, (E) maturing and (F) mature. Values of R2 and Akaike Information Citerion for each relationship are available in Table 2.
Figure 3 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 3. Statoliths of Doryteuthis plei at different stages of maturity. (A) Immature, 42 mm ML and 1.04 mm SL; (B) maturing female, 144 mm ML and 1.6 mm SL; (C) mature male, 201 mm ML and 1.59 mm SL; (D) spent female, 159 mm ML and 1.58 mm SL.
Figure 2 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 2. Statoliths of Doryteuthis plei at different sizes, represented from (A) to (P). The first number between brackets indicates the SL (in mm) and the second the respective individual ML (in mm), as follows: A (0.85; 25), B (0.96; 35), C (1.08; 45), D (1.16; 50), E (1.25; 57), F (1.32; 82), G (1.46; 85), H (1.49; 109), I (1.51; 111), J (1.56; 123), K (1.64; 139), L (1.66; 166), M (1.69; 157), N (1.78; 221), O (1.80; 194) and P (1.83; 263).
Figure 1 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 1. Doryteuthis plei statolith measurements. (A) Anterior face: angle of dome (ÂD), dome length (DL); (B) rear face: estimated statolith length (SL), angle of rostrum (ÂR).
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