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Gradual evolutionary transformations of ontogeny in an ordovician ostracod lineage


, : Gradual evolutionary transformations of ontogeny in an ordovician ostracod lineage. Lethaia 22(2): 159-168

Carapace morphology was studied biometrically for each instar in a series of populations of Mojczella Olempska 1988 from the Ordovician strata exposed in Mojcza, Holy Cross Mountains, Poland. Phosphatic coating of ostracod valves occur there in abundance from the top of the Arenig to the Late Caradoc. The lineage shows smooth acceleration in ontogenetic expression of the junction of crests C1 and C3, which originally were separated throughout the ontogeny, while in the latest populations the separation was preserved only in the earliest moult stage. Moreover, the velar structure, being originally developed as a wide, slightly convex, flange-like dolon in heteromorphs, became transformed into a convex dolon.

US$19.90

DOI: 10.1111/j.1502-3931.1989.tb01678.x


Other references

Raman, S.; Iljadica, A.; Gyaneshwar, R.; Taito, R.; Fong, J., 2016: Improving maternal and child health systems in Fiji through a perinatal mortality audit. To develop a standardized process of perinatal mortality audit (PMA) and improve the capacity of health workers to identify and correct factors underlying preventable deaths in Fiji. In a pilot study, clinicians and healthcare managers in obstetri...

Higashi, Y.; Sato, T.; Shimojima, H.; Takeyama, Y.; Goto, K.; Mitsuya, T.; Sagawa, F.; Ishikawa, R.; Ishikawa, Y., 2003: Mechanism of decrease in the atrial potential after implantation of a single-lead VDD pacemaker: atrial histological changes after implantation of a VDD pacemaker lead in dogs. The single-lead VDD pacemaker system (VDDPS) enables atrial synchronous ventricular pacing with only one lead in patients with an atrioventricular block. There are some cases in which the atrial potential decreases after implantation of a VDDPS, m...

Hornok, S.; Bitay, Z.; Széll, Z.; Varga, I., 1998: Assessment of maternal immunity to Cryptosporidium baileyi in chickens. The degree of protection to Cryptosporidium baileyi in the progeny of infected chickens was studied. Hens at the beginning of their laying period were given orally three consecutive, large doses of C. baileyi oocysts at weekly intervals. The infec...

Lidholm, S.O.; Lindbo, A.S.Jut, H.J., 1961: Multiple capillary hemangiomas of the bones of the foot. Acta Pathologica et Microbiologica Scandinavica 51: 9-16

Kabata Z., 1970: 3 copepods crustacea parasitic on fishes of the genus lepidion pices teleostei. Journal Of Parasitology: 175-184

Costanzi, J.J., 1988: Malignant melanoma. Why early diagnosis and treatment are crucial. Postgraduate Medicine 84(6): 159-60, 163-8

Doyle, L.W.; Anderson, P.J.; Haslam, R.; Lee, K.J.; Crowther, C.; Darlow, B.; Austin, N.; French, N.; Campbell, C.; Carse, E.; Hayes, M.; Harding, J.; McKinlay, C.; Bevan, C.; de Paoli, A.; Sutton, L.; Rieger, I.; Wocadlo, C.; Colditz, P.; Pritchard, M.; Gray, P.H.; Watkins, A.; Opie, G.; Kelly, E.; Woods, H.; Anderson, P.J.; Callanan, C.; Davis, N.; Doyle, L.W.; Duff, J.; Weston, P.; Crowther, C.; Haslam, R.; Ashwood, P., 2014: School-age outcomes of very preterm infants after antenatal treatment with magnesium sulfate vs placebo. Antenatal magnesium sulfate given to pregnant women at imminent risk of very preterm delivery reduces the risk of cerebral palsy in early childhood, although its effects into school age have not been reported from randomized trials. To determine t...

Khasanov, O.Kh., 1962: The antibiotic properties of fungi of the genus Trichoderma Pers. isolated from meadow-boggy soils of Uzbekistan. At Inst. Bot., Uzbek Acad. Sei., culture liquids of Trichoderma sp., T. lignorum, and T. koningii showed no activity against Bact. malvacearum or other phytopathogenic bacteria tested . Volatile fractions were fungistatic to cultures of Monilia fr...

Sarrat, S.Urreil, T.Nga, D., 1958: Arteriovenous physiological communications in normal states & their dysfunction during various pathological syndromes. Journal de Medecine de Bordeaux et du Sud-Ouest 135(4): 324-339

Gerasimenko, Vf, 1981: Preliminary evaluation of the breeding material by the parameters of ecological plasticity Winter wheat varieties.1. Sel'skokhoziaistvennaia biologiia 16(6): 938-941