Xestoleberis sp., from here.

Belongs within: Cytherocopina.

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 1866S-VC91
|--*X. aurantia (Baird 1838) [=Cythere aurantia]BB61
|--X. arcturi Triebel 1956DH86
| |--X. a. arcturiDH86
| `--X. a. darwini Gottwald 1983DH86
|--X. burnetti Weaver 1982WSB93
|--X. chilensis Hartmann 1962G83
| |--X. c. chilensisG83
| `--X. c. austrocontinentalis Hartmann 1978G83
|--X. costata Hartmann 1954DH86
|--X. delamarei Hartmann 1954DH86
|--X. depressaS61
|--X. erichtriebeli Bate, Whittaker & Mayes 1981G83
|--X. eulitoralis Hartmann 1959H59
|--X. fracticorallicola Hartmann 1974DH86
|--X. galapagoensis Gottwald 1983DH86
|--X. gracilis Brady 1890G83
|--X. hopkinsi Skogsberg 1950S-VC91
|--X. humilis Klie 1940G83
|--X. meridionalis Müller 1908G83
|--X. rubrimaris Hartmann 1962G83
| |--X. r. rubrimarisG83
| `--X. r. australensis Hartmann 1978G83
|--X. subglobosaBB61
|--X. tomkilenyi Bate, Whittaker & Mayes 1981G83
`--X. ventribullataG83

*Type species of generic name indicated


[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.

[H59] Hartmann, G. 1959. Zur Kenntnis der lotischen Lebensbereiche der pazifischen Küste von El Salvador unter besonderer Berücksichtigung seiner Ostracodenfauna. Kieler Meeresforschungen 76 (2): 187–241.

[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.

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