fbpx
Wikipedia

Physopyxis

Physopyxis is a genus of thorny catfishes native to tropical South America.

Physopyxis
Physopyxis lyra, conventional and X-ray images
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Siluriformes
Family: Doradidae
Subfamily: Astrodoradinae
Genus: Physopyxis
Cope, 1871
Type species
Physopyxis lyra
Cope, 1872

Species edit

There are currently three recognized species in this genus.[1]

Distribution edit

P. lyra is known from the Ampyiacu River (and lowland portions of other tributaries to the upper Amazon River in northeastern Peru) to the Uatumã River, a left bank tributary to the Amazon in eastern Amazonas State, Brazil.[2] P. ananas has the widest distribution among the species of the genus, occurring throughout lowlands in entire Amazon (including Rio Negro) and Essequibo River basins.[2] P. cristata has only been recorded from middle portion of the Negro River basin.[2]

Description edit

Physopyxis have an extremely small size among doradids, not exceeding 3.5 centimetres (1.4 in) SL.[1] Their pectoral fin spine reaches the base of the anal fin, and the dorsal fin spine is serrated only at the anterior margin of its base.[2] There are three pairs of barbels, one pair of maxillary barbels and two pairs of mental barbels. The dorsal and pectoral fin spines are strongly ossified and well-developed.[2]

P. cristata can be differentiated from the other species by its incomplete lateral line and a series of small spines along its dorsal midline. The other two species have complete lateral lines with well-developed plates that extend to the caudal fin. P. lyra has only one series of spines on its lateral plates and its adipose fin is usually present. The lateral plates have two or more series of spines in P. ananas, and the adipose fin is usually absent.[2]

Habitat edit

Physopyxis species are usually found in places with accumulated organic debris, like dense meshes of roots of floating macrophytes that are abundant in rivers with turbid water or submerged litter banks. Specimens also can be found among submerged leaf litter and among root mats of riparian plants, like Symmeria paniculata (Polygonaceae). P. lyra is predominantly nocturnal, and spends most of day time sheltered among submersed root mats or buried in sand.[2] P. ananas and P. lyra have been found together among the submerged roots of aquatic macrophytes (Paspallum repens, Poaceae) at Amanã Lake, Japurá River basin. They were also collected together in Nanay upstream from Iquitos.[2] Dwarf cichlids of the genus Apistogramma and juvenile specimens of Amblydoras were found in the same habitat as P. cristata.[2]

References edit

  1. ^ a b Froese, Rainer and Pauly, Daniel, eds. (2011). Species of Physopyxis in FishBase. December 2011 version.
  2. ^ a b c d e f g h i Sousa, Leandro M.; Rapp Py-Daniel, Lúcia H. (2005). "Description of two new species of Physopyxis and redescription of P. lyra (Siluriformes: Doradidae)". Neotropical Ichthyology. 3 (4): 625–636. doi:10.1590/S1679-62252005000400019.

physopyxis, genus, thorny, catfishes, native, tropical, south, america, lyra, conventional, images, scientific, classification, domain, eukaryota, kingdom, animalia, phylum, chordata, class, actinopterygii, order, siluriformes, family, doradidae, subfamily, as. Physopyxis is a genus of thorny catfishes native to tropical South America Physopyxis Physopyxis lyra conventional and X ray images Scientific classification Domain Eukaryota Kingdom Animalia Phylum Chordata Class Actinopterygii Order Siluriformes Family Doradidae Subfamily Astrodoradinae Genus PhysopyxisCope 1871 Type species Physopyxis lyraCope 1872 Contents 1 Species 2 Distribution 3 Description 4 Habitat 5 ReferencesSpecies editThere are currently three recognized species in this genus 1 Physopyxis ananas Sousa amp Rapp Py Daniel 2005 Physopyxis cristata Sousa amp Rapp Py Daniel 2005 Physopyxis lyra Cope 1872Distribution editP lyra is known from the Ampyiacu River and lowland portions of other tributaries to the upper Amazon River in northeastern Peru to the Uatuma River a left bank tributary to the Amazon in eastern Amazonas State Brazil 2 P ananas has the widest distribution among the species of the genus occurring throughout lowlands in entire Amazon including Rio Negro and Essequibo River basins 2 P cristata has only been recorded from middle portion of the Negro River basin 2 Description editPhysopyxis have an extremely small size among doradids not exceeding 3 5 centimetres 1 4 in SL 1 Their pectoral fin spine reaches the base of the anal fin and the dorsal fin spine is serrated only at the anterior margin of its base 2 There are three pairs of barbels one pair of maxillary barbels and two pairs of mental barbels The dorsal and pectoral fin spines are strongly ossified and well developed 2 P cristata can be differentiated from the other species by its incomplete lateral line and a series of small spines along its dorsal midline The other two species have complete lateral lines with well developed plates that extend to the caudal fin P lyra has only one series of spines on its lateral plates and its adipose fin is usually present The lateral plates have two or more series of spines in P ananas and the adipose fin is usually absent 2 Habitat editPhysopyxis species are usually found in places with accumulated organic debris like dense meshes of roots of floating macrophytes that are abundant in rivers with turbid water or submerged litter banks Specimens also can be found among submerged leaf litter and among root mats of riparian plants like Symmeria paniculata Polygonaceae P lyra is predominantly nocturnal and spends most of day time sheltered among submersed root mats or buried in sand 2 P ananas and P lyra have been found together among the submerged roots of aquatic macrophytes Paspallum repens Poaceae at Amana Lake Japura River basin They were also collected together in Nanay upstream from Iquitos 2 Dwarf cichlids of the genus Apistogramma and juvenile specimens of Amblydoras were found in the same habitat as P cristata 2 References edit nbsp Wikimedia Commons has media related to Physopyxis a b Froese Rainer and Pauly Daniel eds 2011 Species of Physopyxis in FishBase December 2011 version a b c d e f g h i Sousa Leandro M Rapp Py Daniel Lucia H 2005 Description of two new species of Physopyxis and redescription of P lyra Siluriformes Doradidae Neotropical Ichthyology 3 4 625 636 doi 10 1590 S1679 62252005000400019 Retrieved from https en wikipedia org w index php title Physopyxis amp oldid 1218788699, wikipedia, wiki, book, books, library,

article

, read, download, free, free download, mp3, video, mp4, 3gp, jpg, jpeg, gif, png, picture, music, song, movie, book, game, games.