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Ogilbia boydwalkeri P. R. M°ller, W. Schwarzhans and J. G. Nielsen, 2005
WALKERS BROTULA
Life   Vertebrata   Fish   Bythitidae   Ogilbia

Ogilbia boydwalkeri
© Copyright Ross Robertson, 2006 · 12
Ogilbia boydwalkeri

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Ogilbia boydwalkeri
© Copyright Photographer/SFTEP, 2002 · 0
Ogilbia boydwalkeri
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Overview
Main identification features
  • head deep
  • adult - preopercular spine 2-3 points
  • cheek 8-10 vertical scale rows
Walkerĺs brotula

Body elongate and somewhat compressed; head relatively narrow (usually <10% of SL) and deep (height usually >16% of SL); snout rounded; a sharp spine on opercle that has 2-3 tips in adults; eye relatively large (1.9-2.8% of SL); upper part of preopercle with a pore; gill rakers 13-16; origin of dorsal fin at level of middle of pectoral fins; pelvic fins inserted below rear part of head; dorsal rays 64-72; anal rays 49-54; origin of anal fin under dorsal rays 20-24; pectoral rays 18-20; tail fin rays 16; body covered with tiny overlapping scales, about 110 in midlateral series; patch of cheek scales with 8-10 vertical rows of scales; belly with scales; penis moderately long, curved, tapering, thin; 2 pairs of long pseudoclaspers associated with penis, outer pair broad, wing shaped, with pointed tip, inner pair with 3 branches at tip, front branch long and curved, rear branch short, a thick fleshy lobe in between.

Probably brown.

Size: reaches 7.1 cm.

Inhabits shallow reefs.

Depth: 1-8 m.

Southern Mexico to El Salvador.


Attributes
Cites: Not listed.
Climate Zone: Northern Tropical (Mexican Province to Nicaragua + Revillagigedos).
Depth Range Max: 8 m.
Depth Range Min: 1 m.
Diet: mobile benthic crustacea (shrimps/crabs); bony fishes.
Eastern Pacific Range: Northern limit=19; Southern limit=13; Western limit=-105; Eastern limit=-89; Latitudinal range=6; Longitudinal range=16.
Egg Type: Live birth; Pelagic larva.
Feeding Group: Carnivore.
FishBase Habitat: Demersal.
Global Endemism: East Pacific endemic; Tropical Eastern Pacific (TEP) endemic; All species.
Habitat: Rocks; Reef associated (reef + edges-water column & soft bottom); Reef only; Reef (rock &/or coral).
Inshore Offshore: Inshore; Inshore Only.
IUCN Red List: Not evaluated / Listed.
Length Max: 7.1 cm.
Regional Endemism: TEP endemic; Continental TEP endemic; Mexican province endemic; Continent only; Continent; All species.
Residency: Resident.
Salinity: Marine; Marine Only.
Water Column Position: Bottom; Bottom only;


Links to other sites

References
  • M°ller, P.R., Schwarzhans, W., Nielsen, J.G., 2005., Review of the American Dinematichthyini (Teleostei: Bythitidae). Part II. Ogilbia., Aqua, 10:133-207.

Acknowledgements

I thank Ashley MacDonald and John Pickering, University of Georgia, for technical support in building this page.


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Common name (e.g. trout)

Genus + Species (e.g. Gadus morhua)

Ogilbia boydwalkeri M├Şller , Schwarzhans & Nielsen , 2005

Professor brotula Add your observation in Fish Watcher
Native range | All suitable habitat | Point map | Year 2100
This map was computer-generated and has not yet been reviewed.
Ogilbia boydwalkeri   AquaMaps   Data sources: GBIF OBIS
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Pictures | Google image Image of Ogilbia boydwalkeri (Professor brotula) Ogilbia boydwalkeri
Picture by M├Şller, P.R.

Classification / Names Common names | Synonyms | Catalog of Fishes ( gen. , sp. ) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Ophidiiformes (Cusk eels) > Bythitidae (Viviparous brotulas) > Brosmophycinae
Etymology: Ogilbia: Taken from Ogilby, 1887-1915, icthiologist and zoologist (Ref. 45335 ) ;   boydwalkeri: Named for Dr. Boyd Walker.   More on authors: M├Şller , Schwarzhans & Nielsen .

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; demersal; depth range 0 - 8 m (Ref. 57883 ).   Tropical

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Eastern Pacific: Mexico and El Salvador.

Size / Weight / Age

Maturity: L m   ?   range ? - ? cm
Max length : 6.1 cm SL male/unsexed; (Ref. 57883 )

Short description Morphology | Morphometrics

Dorsal soft rays (total): 64-72; Anal soft rays : 49 - 54; Vertebrae : 39 - 41. The species is distinguished by the following characters: vertebrae 11 + 28-30 = 39-41, dorsal fin rays 64-72, anal fin rays 49-54; outer pseudoclasper is broad, wingshaped with single curved supporter; inner pseudoclasper with three lobes, consisting of a branched supporter, anterior branch curved and long, posterior branch short, and a thick fleshy lobe in between; penis with no abrupt change in thickness; opercular spine with single, sharp tip in small specimens and bi- or tri-furcated in specimens > 45 mm SL; scale patch on cheeks is broad, with 8-10 vertical scale rows; otolith length: height ratio 2.2 (Ref. 57883 ).

Biology     Glossary (e.g. epibenthic)

Apparently lives on rocky bottoms (Ref. 57883 ).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator | Collaborators

M├Şller, 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. 120744 )

  Least Concern (LC)  ; Date assessed: 29 April 2008

CITES (Ref. 115941 )

Not Evaluated

CMS (Ref. 116361 )

Not Evaluated

Threat to humans

  Harmless




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Internet sources

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Estimates of some properties based on models

Preferred temperature (Ref. 115969 ): 24.3 - 29.1, mean 26.9 (based on 190 cells). Phylogenetic diversity index (Ref. 82805 ):  PD 50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high]. Bayesian length-weight: a=0.00447 (0.00174 - 0.01147), b=3.10 (2.87 - 3.33), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245 ). Trophic Level (Ref. 69278 ):  3.2   ±0.5 se; Based on size and trophs of closest relatives Resilience (Ref. 69278 ):  High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.). Vulnerability (Ref. 59153 ):  Low vulnerability (12 of 100) .

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