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Exoglossum laurae, Tonguetied minnow
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Exoglossum laurae
Female picture by
N. Burkhead & R. Jenkins, courtesy of VDGIF
Teleostei (teleosts) >
Cypriniformes
(Carps) >
Leuciscidae
(Minnows) > Pogonichthyinae
Etymology:
Exoglossum:
Greek, exos = outside + Greek, glossa = tongue (Ref.
45335
)
.
More on author:
Hubbs
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; demersal. Temperate; 43°N - 36°N
North America: 3 areas of the upper Ohio River basin in USA: upper Allegheny River drainage in New York and Pennsylvania, and upper Genesee River (Lake Ontario drainage) in New York and Pennsylvania; upper New River drainage in West Virginia, Virginia and North Carolina; and Great Miami and Little Miami River systems in Ohio.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 16.0 cm TL male/unsexed; (Ref.
86798
); common length : 10.0 cm TL male/unsexed; (Ref.
12193
); max. reported age: 4 years (Ref.
12193
)
Short description
Morphology
|
Morphometrics
Anal
soft rays
: 7.
Exoglossum laurae
is distinguished by the following characters: central body plate with fleshy lobe to either side on lower jaw; body chubby and barely compressed; deep caudal peduncle; dorsal fin origin over pelvic fin origin; snout round, mouth sub-terminal; thick upper lip thinner at middle; premaxillary frenum present; usually a small barbel near corner of mouth; complete lateral line with 47-53 scales; 7 anal rays; pharyngeal teeth 1,4-4,1. Body color olive-gray above, silver green-purple side; fins clear to light olive or light red; and small individuals with dusky stripe along side and onto snout, black caudal spot (Ref.
86798
).
Inhabits rocky pools and runs of creeks and small to medium rivers, often near vegetation or other cover. Males construct large circular or rectangular nests by piling pebbles carried in the mouth (Ref.
86798
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Page, L.M. and B.M. Burr
, 2011. A field guide to freshwater fishes of North America north of Mexico. Boston : Houghton Mifflin Harcourt, 663p. (Ref.
86798
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
27 January 2012
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Zoological Record
Estimates based on models
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00851 (0.00376 - 0.01926), b=3.06 (2.86 - 3.26), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 2.9 ±0.4 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (tmax=4).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (10 of 100).
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- 20 July 2016
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