Reserva Ecológica Costanera Sur

Sitio realizado por aficionados a la observación de aves desde 10 de enero 2006

Other Vertebrates

Mammals
Mammals are a class of warm-blooded vertebrates. They possess hair and mammary glands, which produce milk to feed the young. They are viviparous, that is, the embryo develops inside the body of the mother. The degree of maturity at birth differentiates three subclasses (monotremes, placentals and marsupials). Placentals are nourished in the mother's uterus through the placenta. Young are born live and do not take long to fend for themselves. Though most placentals are difficult to see during the day, coypus and guinea pigs may be the exceptions. Marsupials, instead, have no true placenta, therefore the embryo has to obtain nutrients somehow. As they leave the uterus they present an uneven development. Hind legs and facial parts are more developed than other parts of the body. By using the hind legs they will crawl to the nipple where they will remain attached to until they complete development.
Marsupials
Thick-tailed Opossum

Thick-tailed Opossum

Lutreolina crassicaudata
White-eared Opossum

White-eared Opossum

Didelphis albiventris
Agile gracile Opossum

Agile gracile Opossum

Cryptonanus chacoensis
Placentals
Plains Vizcacha

Plains vizcacha

Lagostomus maximus
Pampas cavy

Pampas cavy

Cavia aperea
Coypu

Coypu

Myocastor coypus
Yellow Pygmy Rice Rat

Yellow pygmy rice rat

Oligoryzomys flavescens
Marsh rat

Marsh rat

Holochilus sp.
House mouse

House mouse

Mus musculus
Hoary Bat

Hoary bat

Lasiurus cinereus
Peters's Mastiff Bat

Peters's mastiff bat

Eumops bonariensis
South American Fur Seal

South American fur seal

Arctophoca australis

Alfredo Sabaliauskas: collaborates in the amphibian and reptile sections
Alfredo Sabaliauskas
Hi! I am Alfredo Sabaliauskas. I am studying biology, I like wildlife photograph and love animals, in particular reptiles and amphibians. My instagram account is @sab.alfred. I have been a member of the COARECS for 4 years now and two years ago I began volutneering at the herpelogic division of the Museo Argentino de Ciencias Naturales. I intend to raise consciousness about reptiles and amphibinas of our country, not very well-famed part of the wild life but very interesting in fact. If in need of reptile or amphibian identification, send a mail to [email protected]

Amphibians
Amphibians are a group of cold-blooded vertebrates. They go through metamorphosis after hatching. They change from gill-breathing (completely water-depending) like fish to lung-breathing (living mainly on land). They hibernate during winter.They are considered ecological indicators. Their presence indicates lack of pollutants in the environment.There is only one order registered here - Anura (toads and frogs).
Main differences between frogs and toads for identification.
Frogs have smooth skin and longer hind legs adapted for leaping.
Toads are bulky and have warty skin. Their hind legs are short (for walking not for leaping)
Anura (frogs and toads)
Hensel's swamp frog

Hensel's swamp frog

Pseudopaludicola falcipes
Creole frog

Creole frog

Leptodactylus latrans
Rana piadora

Oven frog

Leptodactylus latinasus
Common Toad

Common Toad

Rhinella arenarum
Bella Vista Toad

Bella Vista Toad

Rhinella fernandezae
Lesser swimming frog

Lesser swimming frog

Pseudis minutus
Snoaring frog

Snoaring frog

Scinax granulatus
Striped snouted tree frog

Striped snouted tree frog

Scinax squalirostris
Dwarf snouted tree frog

Dwarf snouted tree frog

Scinax berthae
Turtles
Turtles belong into the order of reptiles. They are characterised by a protective shield which allows only head, legs and tail to be seen through two openings, one at the front and the other at the back. In case of threat these parts may also disappear in the inside. The shield consists of two shells -carapace and plastron, upper lower parts respectively- joined together at the sides by bony structures.Turtles are classified according to the way they withdraw their head into their shells. Side-necked turtles or Pleurodira fold their long neck laterally between the carapace and plastron leaving the head and neck partially exposed. They are only found in the Southern Hemisphere. Hidden-necked turtles or Cryptodira pull their heads back into the shell with vertebrae adopting an S form in the inside. Both groups are represented at Costanera.The four registered species (three are native and one is exotic) live in the ponds. Webbed feet, limbs rather flattened and a streamlined carapace are the adaptations to aquatic life. Though they spend most of their time in water they lay eggs on land. Females dig a hole where eggs are buried and left unattended.
Snake-necked Turtle

Snake-necked Turtle

Hydromedusa tectifera
Side-necked Turtle

Side-necked Turtle

Phrynops hilarii
Red-eared Turtle

Red-eared Turtle

Trachemys scripta elegans
Painted Turtle

Painted Turtle

Trachemys dorbignyi
Common snapping turtle

Common snapping turtle

Chelydra serpentina
Scaled reptiles
They are so called because their body is covered with horny scales. They are divided in three suborders quite different in appearance: lizards, snakes and worm lizards. All of them are represented at Costanera.
Lizards
Lizards have four short legs adapted to locomotion. The long tail can be shed and regenerated. The mandibles are not mobile. On the contrary, the eyelids are.
Black-and-white Tegu Lizard

Black-and-white Tegu Lizard

Salvator merianae
Red Tegu Lizard

Red Tegu Lizard

Salvator rufescens
Mabuya

Mabuya

Aspronema dorsivittatum
Etheridge's Lava Lizard

Etheridge's Lava Lizard

Tropidurus etheridgei
Common Wall Gecko

Common Wall Gecko

Tarentola mauritanica
Snakes
Snakes have no limbs, so they crawl. They have elongated body and tail. Mandibles are joined by ligaments. This gives great bite mobility allowing the passage of big pieces through them. They have no mobile eyelids; only a fixed and transparent eyelid covers the eye. Snakes may be venomous or non-venomous. Some traits may help us to tell them apart. Unfortunately they are not always foolproof. So it is wise to keep away from them in case of doubt.a) Non-venomous snakes have big scales covering their heads. Venemous snakes have small scales.b) Non-venomous snakes have big eyes and round pupils. Venomous snakes have smaller eyes and elliptical pupils like the cat’s eye.c) Non-venomous snakes have rounded heads. Venomous snakes have spear-like heads.

To identify a snake a photo of the head is crucial since in a great number of species the diagnostic characters are found there. That is, spots on the supra and infralabial scales, eye size, protuberances on the snout or depression on the neckThe number of the scales on the head is used to tell similar species apart and sometimes it is very difficult to rely on photographs. Besides a photo of the neck, the upperpart is also useful for pattern identification. The patterns are normally uniform all along the upperparts, so a photo of half the body is enough. The whole body also works.
So, in summary to identify a snake:
1 photo of the head, better if it includes lateral and/or dorsal views
2 photo of the upperparts or the whole body to observe the pattern
3 Habits of the individual, where it was, near a body of water, in a tree, etc

Brown mussurana

Brown mussurana

Paraphimophis rustica
Golden liophis

Golden liophis

Erythrolamprus semiaureus
Keeled sepia snake

Keeled sepia snake

Thamnodynastes hypoconia
Tree Coastal Housesnake

Tree coastal house snake

Thamnodynastes strigatus
Colubroidean snake

Dipsadid snake

Helicops infrataeniatus
Colubroidean snake

Dipsadid snake

Helicops leopardinus
Urutu Pit Viper

Urutu Pit Viper

Bothrops alternatus
Worm Lizards
Worm lizards are adapted to underground life. They have an elongated cylinder-like body and are limbless, but for one species. Scales arrange in rings. So, worm lizards move in an accordion-like way and can do it forwards or in reverse indistinctly. It has atrophied eyes. Tail and head are quite similar in form and almost indistinguishable.
Worm Lizard

Worm Lizard

Amphisbaena sp.

Guillermo Spajic collaborates in the fish section
Guillermo Spajic
Passionate about fish, keen nature observer and sport fisherman. Founding partner and member of the Directive Committee of AAPS (Argentine Assoication of Bait and Fly Fishing). This entity has the primary goal of preserving fish species and responsible fishing. Member of COA Carancho (Club de Observadores de Aves de Palermo - Birdwatchers' Club). Former teacher at the Fishing School for Kids of the Club de Pescadores de Buenos Aires. I run "Pesca en Streaming", a radio program oriented to spread responsible fishing and issues related to nature and conservation.

Fish
Fish are aquatic vertebrate animals which are characterized by having most of them scales, fins and gills, which allow them to get the oxigen from water. They are ectothermic, that is cold-blooded, their temperature varies according to ambient temperature.
Marbled swamp eel

Marbled swamp eel

Synbranchus marmoratus
Livebearer

Livebearer

Cnesterodon decemmaculatus
Tetra

Tetra

Astyanax sp.
Catfishes

Catfishes

Flia Loricariidae
Long-whiskered Catfish

Long-whiskered Catfish

Pimelodus maculatus
Long-whiskered Catfish

Long-whiskered Catfish

Parapimelodus valenciennis
Granulated Catfish

Granulated Catfish

Pterodas granulosus
Speckled Piranha

Speckled Piranha

Serrasalmus spilopleura
Shad

Shad

Prochilodus lineatus
Pike characin

Pike characin

Oligosarcus jenynsii