Ammocrypta és un gènere de peixos pertanyent a la família dels pèrcids.[3]
Es troba a Nord-amèrica.[4]
Ammocrypta is a genus of freshwater ray-finned fish, commonly known as the sand darters, which is classified in the subfamily Etheostomatinae, part of the family Percidae which also includes the perches, ruffes and pikeperches. The species in the genus occur in eastern North America in Canada and the continental United States.[3]
Ammocrypta species are characterised by having rather elongate and slender bodies. Their bodies are translucent and there is only a single spine in the anal fin. They also have Spreitzer vertebrae, that is that the first three vertebrae of the backbone, counting from the head, have an open haemal arch which allows for the fish's kidney to expand. They have the habit of burying into the sand or gravel bed of streams, only their eyes being visible. The translucence of their bodies and their habit of burying themselves gives them some protection against predation.[4]
The shared morphological characteristics of Ammocrypta with its sister taxon Crystallaria include the possession of complete lateral lines and unbroken canal on the head. They also share high meristic counts which are thought to be indications of basal morphology, referred to as plesiomorphies.[4]
Ammocrypta is found in eastern North America where thy are found across the central part of the coastal plain of the Gulf of Mexico, the whole of the drainage basin of the Mississippi River and of the Ohio River, the Lake St Clair system as well as the lower drainage basins of Lake Huron and Lake Superior.[5]
The currently recognized species in this genus are:[3]
Ammocrypta is the sister taxon of the genus Crystallaria and together these genera are the sister taxon of the clade consisting of the speciose genus Etheostoma and Nothonotus.[4] Some authorities regard Crystallaria as a subgenus of Ammocrypta.[6]
Ammocrypta is a genus of freshwater ray-finned fish, commonly known as the sand darters, which is classified in the subfamily Etheostomatinae, part of the family Percidae which also includes the perches, ruffes and pikeperches. The species in the genus occur in eastern North America in Canada and the continental United States.
Ammocrypta est un genre de poissons de la famille des Percidae, communément appelées « dard de sable » et que l'on rencontre en Amérique du Nord.
Il s'agit de poissons de petite taille (7 à 9 cm) à la forme allongée et se tenant habituellement posés sur le fond des cours d'eau.
Selon FishBase (30 janvier 2016)[1] :
Ammocrypta est un genre de poissons de la famille des Percidae, communément appelées « dard de sable » et que l'on rencontre en Amérique du Nord.
Il genere Ammocrypta comprende 6 specie di piccoli pesci d'acqua dolce appartenenti alla famiglia Percidae.
Questi pesci sono diffusi in America del Nord, in diversi ambienti fluviali e lacustri (dai Grandi Laghi ai bacini idrografici dei fiumi Missouri e Mississippi).
I pesci del genere Ammocrypta presentano un corpo snello e sottile, molto allungato e piuttosto compresso ai fianchi. Vi sono due pinne dorsali, la prima è bassa e retta da raggi grossi, la seconda è alta, opposta e simmetrica alla pinna anale. Le pinne ventrali e pettorali sono ampie. La pinna caudale è a delta. La livrea è differente per ogni specie, ma prevale la colorazione mimetica, beige chiazzata di bruno, con pinne trasparenti.
Le dimensioni si attestano sui 7–8 cm, secondo la specie.
Ammocrypta pellucida risulta iscritta come vulnerabile alla IUCN Red List.
Il genere comprende 6 specie:
Il genere Ammocrypta comprende 6 specie di piccoli pesci d'acqua dolce appartenenti alla famiglia Percidae.
Ammocrypta is een geslacht van straalvinnige vissen uit de familie van de echte baarzen (Percidae).
Ammocrypta is een geslacht van straalvinnige vissen uit de familie van de echte baarzen (Percidae).
Multimedia w Wikimedia Commons Ammocrypta – rodzaj ryb z rodziny okoniowatych.
Gatunki zaliczane do tego rodzaju [2]:
Ammocrypta – rodzaj ryb z rodziny okoniowatych.
Ammocrypta là một chi thuộc họ Percidae nguồn gốc từ Canada và Hoa Kỳ.
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