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Overview |
Main identification features
- top jaw - end low
- dorsal fin 66-77
- lower jaw - rear 3 pores small
- anal fin origin under dorsal fin 20-25
Body elongate, slender and somewhat compressed; head relatively long (24.1-28.1% of SL), and low (height 13.6-16.2 % of SL); rear end of top jaw low; rear 3 pores of bottom jaw small; snout rounded; mouth large; a sharp spine on opercle that has 1 tip; eye relatively large (2.1-2.6% of SL); wide between eyes; upper part of preopercle with a pore; gill rakers 13-17; origin of dorsal fin at level of middle of pectoral fins; pelvic fins inserted below rear part of head; dorsal rays 66-77; anal rays 51-57; origin of anal fin under dorsal rays 20-25; pectoral rays 18-22; tail fin rays 15-16; body covered with relatively large overlapping scales, about 110 in midlateral series; patch of cheek scales with 8 (6-9) vertical rows of scales; belly with scales; penis long, curved, tapering, thin; 2 pairs of long pseudoclaspers associated with penis, outer pair slender, ending in a spine-like tip, inner pair long, thin, with a fleshy appendix at rear.
Light brown, belly yellowish; dorsal fin with brown base, yellow center, pale outer part; tail and anal fins yellow.
Size: reaches 8 cm.
Inhabits shallow reefs.
Depth: 6-27 m.
The SE Gulf of California to northern Costa Rica.
Attributes
Cites: Not listed.
Climate Zone: Northern Tropical (Mexican Province to Nicaragua + Revillagigedos); Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo).
Depth Range Max: 27 m.
Depth Range Min: 6 m.
Diet: mobile benthic crustacea (shrimps/crabs); zooplankton.
Eastern Pacific Range: Northern limit=21; Southern limit=7; Western limit=-106; Eastern limit=-81; Latitudinal range=14; Longitudinal range=25.
Egg Type: Live birth; Pelagic larva.
Feeding Group: Carnivore.
Global Endemism: East Pacific endemic; Tropical Eastern Pacific (TEP) endemic; All species.
IUCN Red List: Not evaluated / Listed.
Length Max: 8 cm.
Regional Endemism: TEP endemic; Continental TEP endemic; Mexican + Panamic provinces endemic; Continent only; Continent; All species.
Residency: Resident;
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Links to other sites |
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References |
- Møller, P.R., Schwarzhans, W., Nielsen, J.G., 2005., Review of the American Dinematichthyini (Teleostei: Bythitidae). Part II. Ogilbia., Aqua, 10:133-207.
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Acknowledgements |
I thank Ashley MacDonald and John Pickering, University of Georgia, for technical support in building this page.
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http://www.fishbase.org/Summary/speciesSummary.php?genusname=Ogilbia&speciesname=robertsoni ---> http://52.67.158.155/Summary/speciesSummary.php?genusname=Ogilbia&speciesname=robertsoni http://52.67.158.155/Summary/speciesSummary.php?genusname=Ogilbia&speciesname=robertsoni ---> https://fishbase.net.br/Summary/speciesSummary.php?genusname=Ogilbia&speciesname=robertsoni https://fishbase.net.br/Summary/speciesSummary.php?genusname=Ogilbia&speciesname=robertsoni ---> https://fishbase.net.br/summary/Ogilbia-robertsoni.html
Ogilbia robertsoni, Brown brotula
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drawing shows typical species in Dinematichthyidae.
Teleostei (teleosts) >
Ophidiiformes
(Cusk eels) >
Dinematichthyidae
(Viviparous brotula)
Etymology:
Ogilbia:
Taken from Ogilby, 1887-1915, icthiologist and zoologist (Ref.
45335
)
;
robertsoni:
Named for Dr. D. Ross Robertson, Smithsonian Tropical Research Institute, Panama (STRI).
.
More on authors:
Møller
,
Schwarzhans
&
Nielsen
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; demersal; depth range 6 - 27 m (Ref.
57883
). Tropical
Eastern Pacific: Mexico to Costa Rica.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 7.1 cm SL male/unsexed; (Ref.
57883
)
Short description
Morphology
|
Morphometrics
Dorsal
soft rays
(total): 67-77;
Anal
soft rays
: 51 - 57;
Vertebrae
: 39 - 41. This species is distinguished by the following characters: Vertebrae 11 + 28-30 = 39-41, dorsal fin rays 67-77, anal fin rays 51-57, outer pseudoclasper with a single, long supporter, extruding into spine-like tip; inner pseudoclasper is slender with a long, straight supporter, almost length of supporter of outer pseudoclasper with ligamentous connection to outer pseudoclasper anteriorly; penis tapering; opercular spine with single sharp tip; scale patch on cheeks with 6-9 vertical scale rows; otolith length: height ratio 2.2-2.3 (Ref.
57883
).
Habitat not known; no ripe females were observed (Ref.
57883
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Møller, P.R., W. Schwarzhans and J.G. Nielsen
, 2005. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part II.
Ogilbia
. aqua, J. Ichthyol. Aquat. Biol. 10(4):133-207. (Ref.
57883
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
29 April 2008
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Estimates based on models
Preferred temperature (Ref.
123201
): 26.8 - 29.1, mean 28.3 °C (based on 118 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.3 ±0.5 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153
): Low vulnerability (10 of 100).
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Page last modified by :
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Updated: 2024-04-25 11:17:02 gmt
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