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Figure 10 in Glass frogs (Centrolenidae) of Yanayacu Biological Station, Ecuador, with the description of a new species and comments on centrolenid systematics

Figure 10. Ventral view of hand (left) and foot (right) of Cochranella posadae, male, QCAZ 25090. Note white pigments covering surface of arm, tarsus and heel. Additional white pigmentation is visible on external border of Finger IV and Toe V. Hand length = 11.0 mm; foot length = 15.6 mm.

Figure 7. A in Glass frogs (Centrolenidae) of Yanayacu Biological Station, Ecuador, with the description of a new species and comments on centrolenid systematics

Figure 7. A, power spectrum; B, sonagram; and C, oscillogram of the advertisement call of Centrolene buckleyi (QCAZ 26032). The call shown here consists of four notes, each note with two distinct pulses. The power spectrum was measured along the duration of the first note.

Figure 1. A in The origin of mammalian endothermy: a paradigm for the evolution of complex biological structure

Figure 1. A, reconstruction of the skeleton of the therocephalian therapsid Regisaurus in lateral and dorsal views (from Kemp, 1986). B, internal view of the nasal cavity of the therocephalian Glanosuchus (from Hillenius, 1994). Abbreviations: etht?, possible ethmo-turbinal ridge; mxt?, possible maxillo-turbinal ridge; nt?, possible naso-turbinal ridge.

Figure 12 in Glass frogs (Centrolenidae) of Yanayacu Biological Station, Ecuador, with the description of a new species and comments on centrolenid systematics

Figure 12. Kidneys of Cochranella wileyi sp. nov., male, QCAZ 26030, ventral view. Note that kidneys are covered with a white peritoneum and small, unpigmented spots. Length of kidneys = 4.7 mm.

Figure 15 in Glass frogs (Centrolenidae) of Yanayacu Biological Station, Ecuador, with the description of a new species and comments on centrolenid systematics

Figure 15. Ventral view of hand of Cochranella wileyi sp. nov., QCAZ 26029. Arrow indicates medial process of Metacarpal III, a character present in all centrolenid frogs.

Figure 13 in Glass frogs (Centrolenidae) of Yanayacu Biological Station, Ecuador, with the description of a new species and comments on centrolenid systematics

Figure 13. Egg clutches of Cochranella wileyi sp. nov. Note that egg clutches are hanging on the tip of leaves. Each egg mass contains between 19 and 28 eggs.

Fig. 6 in Biology of growth of Hoplias aff. malabaricus (Bloch, 1794) in a shallow pampean lake (Argentina)

Fig. 6. Von Bertalanffy growth curves of trahira Hoplias aff. malabaricus obtained by several studies in South America (see Table 2 for sources information): Yalca summer group 1, Y1; Yalca spring group, Y2; Chascomús, C; Indio Muerto, IM; Monte, M; Lobos, L; Cienaga Grande de Lorica, CGL; Amanari Maranguepe female, AM f; Amanari Maranguepe male, AM m.

Fig. 3 in Biology of growth of Hoplias aff. malabaricus (Bloch, 1794) in a shallow pampean lake (Argentina)

Fig. 3. Frequency distribution of total lengths of the trahira Hoplias aff. malabaricus captured during the entire sampling period.

Fig. 5 in Biology of growth of Hoplias aff. malabaricus (Bloch, 1794) in a shallow pampean lake (Argentina)

Fig. 5. Trahira annual variation of observed individual Gonadosomatic index (GSI) and its respective fitted model, and expanded condition index (Knexp) curve (a). Mean relative marginal-increment scale index (MI%) and its respective standard deviations at each sampling date with the corresponding fitted model. Asterisk in MI (%) curve indicates the mean date of ring formation. Different letters below the MI% mean values indicate significant differences (p<0.05) (b).

Fig. 1 in Biology of growth of Hoplias aff. malabaricus (Bloch, 1794) in a shallow pampean lake (Argentina)

Fig. 1. Geographical location of Yalca Lake and its geographical position in south America. The sampling stations in the lake are indicated.

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Fig. 4 in Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae) (Steindachner, 1878) in the bay of Marajo, Amazon Estuary, Brazil

Fig. 4. Mean values of ∆RGS (a) and ∆K (b) and frequency of bi-monthly percentage of the maturational stages for the females (c) of Plagioscion magdalenae in the bay of Marajo.

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Fig. 3 in Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae) (Steindachner, 1878) in the bay of Marajo, Amazon Estuary, Brazil

Fig. 3. Photomicrographs of Plagioscion magdalenae ovarian tissue at various maturity stages. a) Immature, HE, 100x. b) Maturing, HE, 100x. c) Mature, HE, 40x. d) Spawned/spent, HE, 40x. I. chromatin nucleolus (stage I); II. perinucleolar stage (stage II); III. cortical alveoli oocytes (stage III); IV. full vitellogenic (stage IV); pf. postovulatory follicles; at. atretic follicles.

Fig. 8 in Reproductive biology and development of gill glands in the inseminating characid, Macropsobrycon uruguayanae Eigenmann, 1915 (Cheirodontinae: Compsurini)

Fig. 8. Oblique section through the gill gland on the first right gill arch of a mature male Macropsobrycon uruguayanae examined by transmission electron microscopy, showing columnar cells (cc) with nucleus (n) near the base of the cell and cytoplasm filled with electron-lucent vesicles between the reduced gill secondary lamellae (sl). In B, note that some vesicles contain more electron-dense material. A, magnification: 1290x. B, magnification: 4135x.

Fig. 1 in Reproductive biology and development of gill glands in the inseminating characid, Macropsobrycon uruguayanae Eigenmann, 1915 (Cheirodontinae: Compsurini)

Fig. 1. Monthly distribution of the gonadosomatic index (GSI) values of males (A) and females (B) of Macropsobrycon uruguayanae. IGS means (triangles) were calculated based only in adult specimens (circles), excluding immature specimens (squares). There were no males collected in August, October, December, and January. A single adult male was captured in November.

Fig. 2 in Reproductive biology and development of gill glands in the inseminating characid, Macropsobrycon uruguayanae Eigenmann, 1915 (Cheirodontinae: Compsurini)

Fig. 2. Relative frequency of males (A) and females (B) of Macropsobrycon uruguayanae with mature gonads (dark bars) and gonads in advanced stages of maturation (white bars).

Fig. 4 in Reproductive biology and development of gill glands in the inseminating characid, Macropsobrycon uruguayanae Eigenmann, 1915 (Cheirodontinae: Compsurini)

Fig. 4. Total counts of vitellogenic oocytes versus body weight (g) of thirteen mature females of Macropsobrycon uruguayanae.

Fig. 7 in Reproductive biology and development of gill glands in the inseminating characid, Macropsobrycon uruguayanae Eigenmann, 1915 (Cheirodontinae: Compsurini)

Fig. 7. Light micrographs of sections through gill glands of two mature male Macropsobrycon uruguayanae; A, C, D, MCP 11939, 28.2 mm SL, glycol methacrylate, toluidine blue; B, MCP 18588, 39.0 mm SL, paraffin, modified Masson's trichrome. A, sagittal section showing gill gland of first gill arch formed from at least 23 modified gill filaments that are fused and covered distally by epithelial tissue (arrowheads) thus forming enclosed chambers (lumen, asterisks); anterior is to the left; unmodified gill filaments (ug) are seem at the posterior region of the gill arch; gill rakers (gr). B, frontal section through ventral region of first gill arch showing a gill gland made up of at least 24 modified gill filaments; each chamber (lumen, asterisk) that is covered distally by epithelial tissue (arrowheads) over most of the surface of the gland eventually opens (o) into the gill chamber ventrally. Note that the gill gland is only formed on the distal side of the first gill arch, unmodified gill filaments (ug) are seen medially. C, higher magnification of the gill gland in "A" showing columnar cells (c) between reduced secondary lamellae; epithelial cover (arrowhead) of gill chambers (lumen, asterisk); artifact space (a). D, higher magnification of "C" showing columnar cells (c) with basal nuclei and granular apical cytoplasm in between greatly shortened secondary lamellae (arrow); artifact spaces (a) due to shrinkage during tissue preparation actually help demonstrate the integrity of the reduced secondary lamellae; gill gland chamber lumen (asterisk).

Fig. 3 in Reproductive biology and development of gill glands in the inseminating characid, Macropsobrycon uruguayanae Eigenmann, 1915 (Cheirodontinae: Compsurini)

Fig. 3. Ovaries and testis. Sagital sections (3mm), stained with hematoxylin and eosin (H&E). A, ovary of a maturing female with previtelogenic oocytes containing spermatozoa (arrows) in the lúmen (specimen collected in July 2001; 27.8 mm SL; IGS=0.89). Magnification: 10x10. B, ovary of a mature female containing spermatozoa in the lúmen (arrows) (specimen collected in September 2001; 28.9 mm SL; IGS=4.87). C, testis showing initial phases of spermiogenesis and spermatozoa. D, testis containing spermatozoa. B, C, D magnification: 40x10.

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Fig. 3 in Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

Fig. 3. Monthly variation of mean hepatosomatic index (HSI) for Brachyhypopomus draco males (above) and females (below) from September 2003 to August 2004. Vertical bars represent the standard deviation and the values between the brackets are the sample size.