Triloculina

Triloculina tricarinata, from here.

Belongs within: Quinqueloculininae.

Triloculina is a genus of miliolid Foraminifera known from the Jurassic to the present, in which only the final three chambers are visible externally at maturity (Loeblich & Tappan 1964).

Characters (from Loeblich & Tappan 1964): Test free, with chambers each one-half coil in length, early chambers at least in microspheric generation in quinqueloculine arrangement, later triloculine, with successive chambers added in planes 120° apart, only final three chambers visible externally; wall calcareous, imperforate, porcellaneous, or rarely with surficial agglutinated layer; aperture terminal, typically wtih bifid tooth; gametes biflagellate, with axostyle.

<==Triloculina d’Orbigny 1826 S-VC91 (see below for synonymy)
    |--*T. trigonula (Lamarck 1804) LT64 [=Miliolites trigonula LT64, Miliola trigonula C40]
    |--‘Miliolina’ australis LJ98
    |--T. bicarinata C40
    |--T. brevidentata LT64
    |--T. circularis LT64
    |--T. cuneata M62
    |--T. dilatata M62
    |--‘*Renoidea’ glabra Brown 1827 LT64
    |--‘*Spidestomella’ globulifera Costa 1856 LT64
    |--T. labiosa M62
    |--T. laevigata d’Orbigny 1826 [=*Miliolina laevigata] LT64
    |--T. marioni M62
    |--T. oblonga LT64
    |--T. parisa S05
    |--T. quadrata S05
    |--‘Miliolina’ reussi LT64
    |--T. rotunda LT64
    |--T. schreibersiana M62
    |--T. squamosa LT64
    |--T. striatotrigonula S05
    |--T. strigillata d’Orbigny 1850 [=*Trillina strigillata] LT64
    |--T. suborbicularis LT64
    |--T. tricarinata d’Orbigny 1826 H03
    |--T. triquetrella S05
    |--T. turkomanica Brodsky 1929 G86
    |--T. webbiana M62
    `--T. wiesneri M62

Triloculina d’Orbigny 1826 S-VC91 [incl. Miliolina Williamson 1858 LT64, Renoidea Brown 1927 LT64, Spidestomella Costa 1856 LT64, Trillina Munier-Chalmas 1882 LT64]

*Type species of generic name indicated

REFERENCES

[C40] Cushman, J. A. 1940. Foraminifera: Their classification and economic use 3^rd ed. Harvard University Press: Cambridge (Massachusetts).

[G86] Golemansky, V. G. 1986. Rhizopoda: Foraminiferida. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 17–20. E. J. Brill/Dr. W. Backhuys: Leiden.

[H03] Hanagata, S. 2003. Miocene-Pliocene Foraminifera from the Niigata oil-fields region, northeastern Japan. Micropaleontology 49 (4): 293–340.

[LJ98] Li, Q., N. P. James, B. McGowran, Y. Bone & J. Cann. 1998. Synergetic influence of water masses and Kangaroo Island barrier on foraminiferal distribution, Lincoln and Lacepede shelves, South Australia: a synthesis. Alcheringa 22 (2): 153–176.

[LT64] Loeblich, A. R., Jr & H. Tappan. 1964. Sarcodina: chiefly “thecamoebians” and Foraminiferida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt C. Protista 2 vol. 1. The Geological Society of America and The University of Kansas Press.

[M62] Monniot, F. 1962. Recherches sur les graviers a Amphioxus de la région de Banyuls-sur-Mer. Vie et Milieu 13: 231–322.

[S-VC91] Segura-Vernis, L. R., & A. L. Carreño. 1991. Foraminíferos y ostrácodos de la Laguna de La Paz, Baja California Sur, México. Inv. Mar. CICIMAR 6 (1): 195–224.

[S05] Semeniuk, T. A. 2005. Fossil foraminiferal assemblages from Pleistocene seagrass-bank deposits of the southern Perth Basin, Western Australia, and their palaeotemperature implications. Journal of the Royal Society of Western Australia 88 (4): 177–190.