Oligostraca

 Drawing of Derocheilocaris typica, from Michigan Science Art.

Belongs within: Euarthropoda.
Contains: Argulidae, Pentastomida, Ostracoda.

The Mystacocarida are a group of minute (~0.45 to 1.01 mm), elongate, cylindrical crustaceans with morphologically relatively unspecialised limbs (Zinn 1986). All known mystacocarids are meiobenthonic, living in the interstitial spaces between sand grains in marine intertidal and subtidal areas. The relationships of mystacocarids to other crustaceans are contentious; they possess a number of apparently primitive features that may be truly so, or may represent neotenic features retained from the naupliar larval stage (Zinn 1986).

<==OligostracaRS10
    |--IchthyostracaLSE13
    |    |--ArgulidaeAC17
    |    `--PentastomidaLSE13
    |--MystacocaridaSC17
    |    |--Ctenocheilocaris Renaud-Mornant 1976Z86
    |    |    |--C. claudiae Renaud-Mornant 1976Z86
    |    |    `--C. galvarini (Dahl 1952) [=Derocheilocaris galvarini]Z86
    |    `--Derocheilocaris Pennak & Zinn 1943 [Derocheilocarididae]Z86
    |         |--D. algoensis McLachlan & Grindley 1974Z86
    |         |--D. angolensis Hessler 1972Z86
    |         |--D. delamarei Hessler 1972Z86
    |         |--D. ingens Hessler 1969Z86
    |         |--D. remanei Delamare Deboutteville & Chappuis 1951Z86
    |         |    |--D. r. remaneiZ86
    |         |    |--D. r. akhzivi Masry & Por 1970Z86
    |         |    |--D. r. biscayensis Delamare Deboutteville 1953Z86
    |         |    `--D. r. katesi Noodt 1954Z86
    |         |--D. tehiyae Masry & Por 1970Z86
    |         `--D. typica Pennak & Zinn 1943Z86
    `--+--OstracodaAC17
       `--Phosphatocopina [Phosphatocopida]AC17
            |--KlausmuelleriaLSE13
            `--+--Hesslandona [Hesslandonidae, Hesslandonina]LSE13
               |    `--H. unisulcata Müller 1982WSB93
               `--VestrogothiinaWSB93
                    |--Monasterium [Monasteriidae]WSB93
                    |    `--M. oepiki Fleming 1973WSB93
                    |--Vestrogothia [Vestrogothiidae]LSE13
                    |    |--V. longispinosa Kozur 1974WSB93
                    |    `--V. spinata Müller 1964WSB93
                    |--Falites [Falitidae]WSB93
                    |    |--F. angustiduplicata Müller 1964WSB93
                    |    `--F. fala Müller 1964WSB93
                    `--OepikalutidaeWSB93
                         |--Zepaera rete Fleming 1973WSB93
                         `--Oepikaluta dissuta Jones & Mckenzie 1980WSB93

*Type species of generic name indicated

References

[AC17] Aria, C., & J.-B. Caron. 2017. Burgess Shale fossils illustrate the origin of the mandibulate body plan. Nature 545: 89–92.

[LSE13] Legg, D. A., M. D. Sutton & G. D. Edgecombe. 2013. Arthropod fossil data increase congruence of morphological and molecular phylogenies. Nature Communications 4: 2485.

[RS10] Regier, J. C., J. W. Shultz, A. Zwick, A. Hussey, B. Ball, R. Wetzer, J. W. Martin & C. W. Cunningham. 2010. Arthropod relationships revealed by phylogenomic analysis of nuclear protein-coding sequences. Nature 463: 1079–1083.

[SC17] Schwentner, M., D. J. Combosch, J. P. Nelson & G. Giribet. 2017. A phylogenomic solution to the origin of insects by resolving crustacean-hexapod relationships. Current Biology 27: 1818–1824.

[WSB93] Whatley, R. C., D. J. Siveter & I. D. Boomer. 1993. Arthropoda (Crustacea: Ostracoda). In: Benton, M. J. (ed.) The Fossil Record 2 pp. 343–356. Chapman & Hall: London.

[Z86] Zinn, D. J. 1986. Mystacocarida. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 385–388. E. J. Brill/Dr W. Backhuys: Leiden.

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