endemic to a single state or province

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

Global Range: Nueces, Frio, and Sabinal rivers, Texas (Mayden et al. 1992).

North America: United States.

Syntype for Dionda serena
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Preparation: Dry Osteological Specimen; Photograph
Collector(s): J. Clark
Year Collected: 1853
Locality: Rio Neuces, Texas., La Salle County, Texas, United States, North America

Syntype for Dionda serena
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Preparation: Dry Osteological Specimen; Photograph
Collector(s): C. Kennerly
Locality: Rio Sabinal, Texas., Uvalde County, Texas, United States, North America

Habitat Type: Freshwater

Comments: A riverine species.

pelagic; freshwater

Non-Migrant: Yes. At least some populations of this species do not make significant seasonal migrations. Juvenile dispersal is not considered a migration.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

Comments: Eats mostly vegetation.

United States

Rounded National Status Rank: N2 - Imperiled

Rounded Global Status Rank: G2 - Imperiled

Reasons: Small range in a few Texas river systems.

Not Evaluated

Comments: Dionda argentosa, D. SERENA, Melanops, Dionda SP 1, and undescribed Dionda from the Rio Conchos, Mexico, formerly were included in D. EPISCOPA (Mayden et al. 1992). Gold et al. (1992) documented chromosomal and genome size data for D. DIABOLI and all other Dionda in Texas and New Mexico and found no significant differences in chromosomes and very little divergence in genome size; they concluded that the taxonomic status of nominal Dionda species warrants further investigation. See Mayden et al. (1992) for additional information on speciation in the genus Dionda.