Micraster


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Mi`cras´ter


n.1.(Paleon.) A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; - from the starlike disposal of the ambulacral furrows.
References in periodicals archive ?
Probablemente de las capas limitrofes entre el Turoniano y Coniaciano de Alban [E9] proviene el Micraster (s.
Antrocaryon micraster (Anacardiaceae) is a deciduous tree which reaches heights of 40-50 m.
Stem bark of Antrocaryon micraster was harvested from Kwahu-Asakraka, Ghana (6[degrees]377 372072" N; 0[degrees]41,23.0352" W), in February 2015.
micraster extract (30, 100 and 300 mg/kg) daily for 3 days.
micraster extract (30, 100, and 300 mg/kg), was given orally 1 h prior to the induction of the oedema while in the curative protocol treatment was 1h after oedema induction.
micraster extract (300, 600, 900, 1200, and 3000 mg/kg), respectively.
Celtis mildbraedii (Ulmaceae) was the most dominant species in the two sites (NFR = 43.18% RA and JSG = 23.58% RA) (Table 1), while eight species in NFR (e.g., Antrocaryon micraster, 2.27% RA) and three species in JSG (e.g., Cedrela odorata, 0.94% RA) were the least recorded.
Nichols, "Changes in the Chalk Heart-Urchin Micraster interpreted in relation to living forms," Philosophical Transactions of the Royal Society of London B: Biological Sciences, vol.
En progressant vers le sommet de ces memes alternances, la serie contient des echinides de l'espece Micraster peini Coquand (notamment dans l'echantillon ET 98) qui en Tunisie caracterise l'intervalle Santonien-Campanien inferieur (Zaghbib-Turki, 1987).
The tree stand, averagely aged 10 years, consisted of species including Entandrophragma angolense, Ceiba petandra (L.), Milicia excelsa (Welw.), Terminada superba (Engl.), Khaya ivorensis (Chev.), Khaya senegalensis (Desr.), and Antrocaryon micraster (Chev.).
The wing surface is covered in micro-scale hydrophobic hairs and nano-scale star-shaped structures called "micrasters".
Further studies showed that micrasters stop very small dew drops from sticking to the wing surface, while the hairs stop larger rain drops.