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  • Argyropelecus bullockii DAVID, 1943

    Images:

    oilshale

    By oilshale

    Taxonomy

    Hachetfish

    Kingdom: Animalia
    Phylum: Chordata Haeckel 1874
    Class: Actinopteri Cope 1871
    Order: Stomiatiformes Rosen 1973
    Family: Sternoptychidae Gill 1863
    Genus: Argyropelecus
    Species: Argyropelecus bullockii
    Author Citation DAVID, 1943

    Geological Time Scale

    Eon: Phanerozoic
    Era: Cenozoic
    Period: Neogene
    Sub Period: None
    Epoch: Miocene

    Stratigraphy

    Monterey Formation

    Provenance

    Acquired by: Purchase/Trade

    Dimensions

    Length: 67 mm

    Location

    Sepulveda Canyon
    Los Angeles County
    California
    United States

    Comments

    Taxonomy according to fossilworks.org.

    Description from DAVID 1943, p. 11: “Length of head 37,5% to 41%, depth of head 43,8% to 58.8%, depth of body 50% to 63.8% of length of body. Vertebrae 38; 2 small abdominal spines; 12 abdominal lanterns; 3 + ? postabdominal lanterns. Supraneurals project above body for a distance equal to four-fifths of base of dorsal fin. D. =9; A. = 12.”

    Line drawing from DAVID 1943, p. 60:

    386866006_Argyropelecusbullockiirecon.JPG.fcee76c583efed3cb0f11493a376e968.JPG

    Photo of a recent Atlantic silver hatchetfish ( Argyropelecus aculeatus) from Wikipedia by SEFSC Pascagoula Laboratory; Collection of Brandi Noble, NOAA/NMFS/SEFSC:

    640px-ArgyropelecusAculeatus.jpg.dec484a6629f43b340856a35037509ed.jpg

     

    Identified by oilshale using David, 1943.

    References:

    David, L. R. (1943): Miocene Fishes of Southern California. Geological Society of America Special Paper 43:1-187.

    Fierstine, H. L., Huddleston R. W., and Takeuchi, G. T. (2012): Catalog of the Neogene bony fishes of California: A ystematic inventory of all published accounts. Occasional Papers of the California Academy of Sciences 159:1-206.

    Go to fossils Fishes

    User Feedback


    siteseer

    I saw some of those available online last year.  I don't know if it was a recent lucky find of several specimens or if an old collection had been sold.  Previously, the species was considered an unusual find.  That's certainly one of nicer specimens.

     

     

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    oilshale
    11 hours ago, siteseer said:

    I saw some of those available online last year.  I don't know if it was a recent lucky find of several specimens or if an old collection had been sold.  Previously, the species was considered an unusual find.  That's certainly one of nicer specimens.

     

     

    According to David 1943, Argyropelecus only occurs in the uppermost layers of the Monterey Formation. Another factor also appears to be the depth of water at which the deposits were formed.  Argyropelecus is a deep sea fish  - recent species live in water depths between 300m and 800m. Most of the deposits in which, for example, Syngnathus emeritus is found appear to have formed in somewhat shallower waters.  Where the pipefish Syngnathus is often found, Argyropelecus is rare and vice versa.

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    siteseer
    10 hours ago, oilshale said:

    According to David 1943, Argyropelecus only occurs in the uppermost layers of the Monterey Formation. Another factor also appears to be the depth of water at which the deposits were formed.  Argyropelecus is a deep sea fish  - recent species live in water depths between 300m and 800m. Most of the deposits in which, for example, Syngnathus emeritus is found appear to have formed in somewhat shallower waters.  Where the pipefish Syngnathus is often found, Argyropelecus is rare and vice versa.

     

    I've known a few people who've collected various layers of the Monterey.  Two of them have dug for Syngnathus.  It's almost the only fish they've found in that layer.  Something like seaweed is also in there but not common.

     

    One friend found a spot where he collected argonaut specimens.  It was a limited exposute so he found just 2 or 3 of them.

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