Microcaracrinus delicatus, from the Smithsonian National Museum of Natural History.

Belongs within: Dendrocrinida.

The Texacrinacea are a group of long-armed crinoids with a tall, slender crown known from the Carboniferous and Permian periods (Moore et al. 1978).

Characters (from Moore et al. 1978): Crown tall and slender, cup bowl-shaped with basal concavity and steep sides near rim, arm facets plenary, one to three anals in cup, anal sac tall, composed of longitudinal rows of plates, arms long, commonly many (to 40) but five or 10 in some.

    |–Sellardsicrinus Moore & Plummer 1940 [Sellardsicrinidae] ML78
    |    `–*S. marrsae Moore & Plummer 1940 ML78
    |–Galateacrinus Moore 1940 [Galateacrinidae, Galateacrininae] ML78
    |    |–*G. stevensi Moore 1940 ML78
    |    `–G. ornatus ML78
    |–Texacrinidae [Texacrininae] ML78
    |    |–Marathonocrinus Moore & Plummer 1940 ML78
    |    |    `–*M. bakeri Moore & Plummer 1940 ML78
    |    `–Texacrinus Moore & Plummer 1940 ML78
    |         |–*T. gracilis Moore & Plummer 1940 ML78
    |         `–T. associatus ML78
    `–Staphylocrinidae ML78
         |–Staphylocrinus Burdick & Strimple 1969 ML78
         |    `–*S. bulgeri Burdick & Strimple 1969 ML78
         |–Abrotocrinus Miller & Gurley 1890 ML78
         |    `–A. unicus (Hall 1861) [=Scaphiocrinus unicus; incl. *A. cymosus Miller & Gurley 1890] ML78
         |–Agnostocrinus Webster & Lane 1967 ML78
         |    `–*A. typus Webster & Lane 1967 Ml78
         |–Dinotocrinus Kirk 1941 ML78
         |    `–*D. compactus Kirk 1941 ML78
         |–Exochocrinus Burdick & Strimple 1969 ML78
         |    `–*E. tumulosus (Miller 1892) [=Eupachycrinus tumulosus] ML78
         |–Hylodecrinus Kirk 1941 ML78
         |    `–*H. sculptus Kirk 1941 ML78
         `–Microcaracrinus Strimple & Watkins 1969 ML78
              |–*M. delicatus Strimple & Watkins 1969 ML78
              |–M. bellirugosus ML78
              |–M. colubrosus ML78
              `–M. conjugulus ML78

*Type species of generic name indicated


[ML78] Moore, R. C., N. G. Lane, H. L. Strimple, J. Sprinkle & R. O. Fay. 1978. Inadunata. In: Moore, R. C., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt T. Echinodermata 2. Crinoidea vol. 2 pp. T520–T759. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

Leave a comment

Your email address will not be published. Required fields are marked *