Xestoleberis

Xestoleberis sp., from here.

Belongs within: Cytheroidea.

Xestoleberis is a cosmopolitan genus of marine ostracods known from the Cretaceous to the present (Benson et al. 1961). At least some species of the genus have one fewer instars in the life cycle than other ostracods, hatching at a more advanced stage of development.

Characters (from Benson et al. 1961): Carapace ovate, left valve larger than right valve. Hinge merodont with elongate crenulate terminal cusps in right valve, separated by somewhat curved to nearly straight, finely crenulate to smooth furrow; marginal areas narrow except in front where vestibule is present; radial canals short, straight; adductor scares in vertical row of four, with arrowhead-shaped antennal scar in front and two mandibular scars below in front, crescent-shaped scar above this group in eye region.

<==Xestoleberis Sars 1866 S-VC91
    |--*X. aurantia (Baird 1838) [=Cythere aurantia] BB61
    |--X. arcturi Triebel 1956 DH86
    |    |--X. a. arcturi DH86
    |    `--X. a. darwini Gottwald 1983 DH86
    |--X. burnetti Weaver 1982 WSB93
    |--X. chilensis Hartmann 1962 G83
    |    |--X. c. chilensis G83
    |    `--X. c. austrocontinentalis Hartmann 1978 G83
    |--X. costata Hartmann 1954 DH86
    |--X. delamarei Hartmann 1954 DH86
    |--X. depressa S61
    |--X. erichtriebeli Bate, Whittaker & Mayes 1981 G83
    |--X. fracticorallicola Hartmann 1974 DH86
    |--X. galapagoensis Gottwald 1983 DH86
    |--X. gracilis Brady 1890 G83
    |--X. hopkinsi Skogsberg 1950 S-VC91
    |--X. humilis Klie 1940 G83
    |--X. meridionalis Müller 1908 G83
    |--X. rubrimaris Hartmann 1962 G83
    |    |--X. r. rubrimaris G83
    |    `--X. r. australensis Hartmann 1978 G83
    |--X. subglobosa BB61
    |--X. tomkilenyi Bate, Whittaker & Mayes 1981 G83
    `--X. ventribullata G83

*Type species of generic name indicated

REFERENCES

[BB61] Benson, R. H., J. M. Berdan, W. A. van den Bold, T. Hanai, I. Hessland, H. V. Howe, R. V. Kesling, S. A. Levinson, R. A. Reyment, R. C. Moore, H. W. Scott, R. H. Shaver, I. G. Sohn, L. E. Stover, F. M. Swain & P. C. Sylvester-Bradley. 1961. Systematic descriptions. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt Q. Arthropoda 3: Crustacea: Ostracoda pp. Q99–Q421. Geological Society of America and University of Kansas Press.

[DH86] Danielopol, D. L., & G. Hartmann. 1986. Ostracoda. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 265–294. E. J. Brill/Dr W. Backhuys: Leiden.

[G83] Gottwald, J. 1983. Interstitielle Fauna von Galapagos. XXX. Podocopida 1 (Ostracoda). Mikrofauna des Meeresbodens 90: 1–187.

[S61] Scott, H. W. 1961. Shell morphology of Ostracoda. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt Q. Arthropoda 3: Crustacea: Ostracoda pp. Q21–Q37. Geological Society of America and University of Kansas Press.

[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.

[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.

Last updated: 11 October 2020.