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Figure 16 in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Figure 16. Argonauta nouryi shell displaying subsumed ears: a–d, four perspectives of shell #139 (72.2 mm shell length, SBMNH 345768) displaying subsumed ear (E) associated with a shift from Type 1 (T1) to Type 2 (T2) shell formation; a, left lateral view; b, close-up of subsumed ear, left lateral view; c, close-up of subsumed ear, oblique left lateral view; d, anterior aperture view. The shell added to the aperture edge in Type 2 shell formation does not expand the ear, instead subsuming it. The resulting aperture edge is not eared. Scale bars = 1 cm.

Figure 13. Argonauta nouryi shell displaying a in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Figure 13. Argonauta nouryi shell displaying a single change in shell formation type: a–d, four perspectives of shell #37 (65.5 mm shell length, SBMNH 345766) displaying a single change from Type 1 (T1) to Type 2 (T2) shell formation; a, left lateral view; b, oblique left lateral view; c, close-up oblique left lateral view; d, posterior keel view. Scale bar = 1 cm.

Figure 9 in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Figure 9. Variation in aperture length across the examined SBMNH lot. Scatter plot of aperture length (ApL) against shell length (ShL) for the single shell lot collected at El Mogote, La Paz, Baja California Sur, Mexico (24° 10' 00" N, 110° 24' 00" W) on 15 January 2000 (SBMNH 345766 & 345768). Eared shells (solid circles) and earless shells (open circles) distinguished. Linear regression lines for eared shells (dashed) and earless shells (dot dashed) with corresponding equations and coefficients of determination (i.e. R2 values) presented.

Figure 7 in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Figure 7. Variation in rib number across the examined SBMNH lot. Scatter plot of rib count (RC) against shell length (ShL) for the single shell lot collected at El Mogote, La Paz, Baja California Sur, Mexico (24° 10' 00" N, 110° 24' 00" W) on 15 January 2000 (SBMNH 3045766 & 345768). Eared shells (solid circles) and earless shells (open circles) distinguished. Linear regression lines for eared shells (dashed) and earless shells (dot dashed) with corresponding equations and coefficients of determination (i.e. R2 values) presented.

Figure 2 in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Figure 2. Argonaut shell measurements and terminology, following Finn (2013): a, Argonauta nodosus aperture view (NMV F164695); b, A. nodosus lateral view (NMV F164695); c, A. argo aperture view (WAM S31503); d, A. nouryi aperture view (SBMNH 345766, specimen #074); e, A. nouryi aperture view (SBMNH 345768, specimen #109). Abbreviations: ApL = aperture length; ApW = aperture width; EW = ear width; KW = keel width; ShB = shell breadth; ShL = shell length. Illustrations: R. Plant.

Figure 12. Repaired shell displaying components consistent with Argonauta nouryi and A in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Figure 12. Repaired shell displaying components consistent with Argonauta nouryi and A. cornutus: a–d, four perspectives of a single shell (52.3 mm shell length, SBMNH 357476) displaying an initial component consistent with A. nouryi Lorois, 1854 ("nouryi") followed by a subsequent component consistent with A. cornutus Conrad, 1854 ("cornutus"); a, right lateral view; b, oblique right lateral view; c, anterior aperture view; d, oblique ventral keel view. Dashed line represents repair line separating two visually different components. Scale bar = 1 cm.

Figure 11 in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Figure 11. Variation in keel width across the examined SBMNH lot. Scatter plot of keel width (KW) against shell length (ShL) for the single shell lot collected at El Mogote, La Paz, Baja California Sur, Mexico (24° 10' 00" N, 110° 24' 00" W) on 15 January 2000 (SBMNH 345766 & 345768). Eared shells (solid circles) and earless shells (open circles) distinguished. Linear regression lines for eared shells (dashed) and earless shells (dot dashed) with corresponding equations and coefficients of determination (i.e. R2 values) presented.

Figure 6 in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Figure 6. Variation in shell shape across the examined SBMNH lot. Scatter plot of shell breadth (ShB) against shell length (ShL) for the single shell lot collected at El Mogote, La Paz, Baja California Sur, Mexico (24° 10' 00" N, 110° 24' 00" W) on 15 January 2000 (SBMNH 345766 & 345768). Eared shells (solid circles) and earless shells (open circles) distinguished. Linear regression lines for eared shells (dashed) and earless shells (dot dashed) with corresponding equations and coefficients of determination (i.e. R2 values) presented.

Figure 5 in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Figure 5. Three similarly sized shells of varied appearance selected from the examined SBMNH lot: a–c, three similarly sized shells of varied appearance selected from the single lot collected at El Mogote, La Paz, Baja California Sur, Mexico (24° 10' 00" N, 110° 24' 00" W) on 15 January 2000; a, shell #74 (65.0 mm shell length, SBMNH 345766) assigned the name cornutus-type voucher; b, shell #42 (61.2 mm shell length, SBMNH 345766) assigned the name intermediate voucher; c, shell #109 (66.5 mm shell length, SBMNH 345768) assigned the name nouryi-type voucher; i–iv, multiple perspectives of each shell; i, left lateral view; ii, anterior aperture view; iii, posterior keel view; iv, ventral view. Scale bar = 1 cm.

Figure 4 in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Figure 4. Comparison of a shell from the examined SBMNH lot with the type specimen and illustrations taken from the original description of Argonauta cornutus Conrad, 1854: a, reproduced illustration taken from the original description of A. cornutus Conrad, 1854, plate 34, fig. 2; b, photographs of the type specimen illustrated in the original description (58.6 mm shell length, ANSP 63496; please note, the original description illustrations mirror the characters of the shell, most likely due to the engraving and printing process of the era); c, illustrations of a shell matching the description of A. cornutus taken from the examined lot (shell #74, 65.0 mm shell length, SBMNH 345766). Illustration: R. Plant. Scale bar = 1 cm.

opencc-by-4.0Oct 2023View details →

РИС. 3. Графики Зависимости: А – Ширины (D) и В – фронтальной кривиЗны (D/L) раковины Corbicula fluminea от длины (L). В качестве Зависимых переменных (y) в формулах укаЗаны Ширина (D) и фронтальнаЯ кривиЗна раковины (D/L). FIG. 3. Graphs of correlations between (A) width (D), (B) frontal curvature (H/L) and the shell length (L) of Corbicula fluminea. The formulas include shell width (D) and frontal curvature (D/L) as dependent variables (y). in Особенности аллометрического роста двустворчатого моллюска-вселенца Corbicula fluminea (Bivalvia: Cyrenidae) иЗ бассейна реки Дон

РИС. 3. Графики Зависимости: А – Ширины (D) и В – фронтальной кривиЗны (D/L) раковины Corbicula fluminea от длины (L). В качестве Зависимых переменных (y) в формулах укаЗаны Ширина (D) и фронтальнаЯ кривиЗна раковины (D/L). FIG. 3. Graphs of correlations between (A) width (D), (B) frontal curvature (H/L) and the shell length (L) of Corbicula fluminea. The formulas include shell width (D) and frontal curvature (D/L) as dependent variables (y).

opencc-by-4.0Mar 2014View details →

Fig. 1 in The Study Of Age-Related Variability Of Pigmentation Patterns Of The Shells Of Dreissena Polymorpha (Bivalvia, Dreissenidae) From Different Parts Of It'S Range

Fig. 1. Change of pattern types on zebra mussel shell. The present shell has four age zones (0+, 1+, 2+, 3+). The pattern sequence is С–АС–А–А.

Figure 8 in Impact of aquatic habitat environment on the elemental composition and shell shape variability of the Beringian freshwater mussel Beringiana beringiana (Bivalvia, Unionidae)

Figure 8. Relationships between values of distribution coefficients (Kd Shell/Water Zn (A), Kd Shell/Water Sr (B) and Kd Shell/Water Al (C)) and principal component 1, revealed from the shell shape analysis of Beringiana beringiana. For the numbers of localities see caption for Figure 7.

Figure 6. Normed PCA factorial graph F1 in Impact of aquatic habitat environment on the elemental composition and shell shape variability of the Beringian freshwater mussel Beringiana beringiana (Bivalvia, Unionidae)

Figure 6. Normed PCA factorial graph F1 × F2 of two revealed geographical groups of Beringiana beringiana samples (blue circles indicate samples from Primorsky Krai, Kunashir, Sakhalin, and Iturup islands; red circles indicate samples from Kamchatka Peninsula). Ellipses show 95 % confidence interval.

Figure 5 in Impact of aquatic habitat environment on the elemental composition and shell shape variability of the Beringian freshwater mussel Beringiana beringiana (Bivalvia, Unionidae)

Figure 5. Relationships between Kd Shell/Sediment Al and Kd Shell/Water Al: (1) Peschanoye Lake, Kunashir Island, (2) Bolshoye Vavayskoye Lake, Sakhalin Island, (3) Vaskovskoye Lake, Primorsky Krai, (4) Lebedinoe Lake, Iturup Island, (5) Kurazhechnoye Lake, Kamchatka Peninsula, (6) Khalaktyrskoye Lake, Kamchatka Peninsula, (7) Chernoye Lake, Sakhalin Island.

Figure 4 in Impact of aquatic habitat environment on the elemental composition and shell shape variability of the Beringian freshwater mussel Beringiana beringiana (Bivalvia, Unionidae)

Figure 4. Median joining networks of Beringiana beringiana (N = 50) based on the COI gene fragment. The circle size is proportional to the number of available sequences belonging to the given haplotype (the smallest = 1 sequence). The red numbers near branches indicate the number of nucleotide substitutions between haplotypes.

Figure 2 in Impact of aquatic habitat environment on the elemental composition and shell shape variability of the Beringian freshwater mussel Beringiana beringiana (Bivalvia, Unionidae)

Figure 2. Shells of Beringiana beringiana specimens, collected from studied waterbodies: A – Kurazhechnoye Lake, Kamchatka Peninsula (voucher number RMBH biv1212/2), B – Vaskovskoye Lake, Primorsky Krai (RMBH biv1181/1), C – Lebedinoye Lake, Iturup Island (RMBH biv1254/2), D – Bolshoye Vavayskoye Lake, Sakhalin Island (RMBH biv1250/1), E - Peschanoye Lake, Kunashir Island (RMBH biv1251/1), F – Khalaktyrskoye Lake, Kamchatka Peninsula (RMBH biv1213/3). Scale bar = 50 mm.

Figure 1 in Impact of aquatic habitat environment on the elemental composition and shell shape variability of the Beringian freshwater mussel Beringiana beringiana (Bivalvia, Unionidae)

Figure 1. Map of the studied region. Lakes: (1) Kurazhechnoye, Kamchatka Peninsula (n = 5), (2) Khalaktyrskoye, Kamchatka Peninsula (n = 5), (3) Lebedinoye, Iturup Island (n = 3), (4) Peschanoye, Kunashir Island (n = 3), (5) Chernoye, Sakhalin Island (n = 3), (6) Bolshoye Vavayskoye, Sakhalin Island (n = 3), (7) Vaskovskoye, Primorsky Krai (n = 3). n reveals the number of collected shells of Beringiana beringiana.

Figure 3. Principal components 1 and 2 in Impact of aquatic habitat environment on the elemental composition and shell shape variability of the Beringian freshwater mussel Beringiana beringiana (Bivalvia, Unionidae)

Figure 3. Principal components 1 and 2 visualized by drawing synthetic outlines of extreme (±2SD) and mean shell shapes of Beringiana beringiana. The umbo position marked by star.

Figure 11 in Impact of aquatic habitat environment on the elemental composition and shell shape variability of the Beringian freshwater mussel Beringiana beringiana (Bivalvia, Unionidae)

Figure 11. Relationships between values of KAl and longitudinal cross-sectional area of shell (mm2), d Shell/Sediment revealed from the shell shape analysis of Beringiana beringiana. For the numbers of localities see caption for Figure 7.