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Odontochitina athabaskensis
Odontochitina athabaskensis Pocock, 1962
Holotype: Pocock, 1962, pl.14, fig. 209
Locus typicus: W Canada
Stratum typicum: Barremian
Original description: Pocock, 1962, p. 78
Theca thin walled, hyaline, laevigate; oval in polar outline, circular in equatorial outline, with three horns; one arising from the epitheca, two from the hypotheca; epithecal horn almost straight long, hypothecal horns slightly curved and of more or less equal length; each of the three horns possesses a bulge close to its junction with the theca; a well marked equatorial groove surrounds the test and marks a line of weakness along which the test frequently breaks into two parts, the isolated fragments being far more common in samples than whole specimens; the holotype shows what appears to be a more or less spiral longitudinal groove passing from the equator to the extremity of the hypotheca; well preserved specimens of this species commonly contain yellowish green rounded organic bodies preserved within the test.
Size (average): Total length 279 µm. Test 60 µm X 39 µm. Length of epithecal spine 135 µm, breadth 3--9 µm. Length of hypothecal spines 81 µm and 75 µm.
Affinities:
Pocock, 1972, p. 78: The major difference between this species and other similar forms lies in the presence in this species of well defined bulges at the ends of the spines nearest the theca.
Supplemental description: Jansonius, 1986, p.213
(Holotype) ca 260 µm overall length; central body ovoidal; with three horns. Horns with a distinct swelling at about 1/3 their length away from the body, which locally doubles their width; in these swellings slender elongate "windows" of thinner wall can be observed. In 1962 the type specimen was not illustrated in full. (Plate 3, fig. 11 is a composite of four separate exposures.)
Holotype: Pocock, 1962, pl.14, fig. 209
Locus typicus: W Canada
Stratum typicum: Barremian
Original description: Pocock, 1962, p. 78
Theca thin walled, hyaline, laevigate; oval in polar outline, circular in equatorial outline, with three horns; one arising from the epitheca, two from the hypotheca; epithecal horn almost straight long, hypothecal horns slightly curved and of more or less equal length; each of the three horns possesses a bulge close to its junction with the theca; a well marked equatorial groove surrounds the test and marks a line of weakness along which the test frequently breaks into two parts, the isolated fragments being far more common in samples than whole specimens; the holotype shows what appears to be a more or less spiral longitudinal groove passing from the equator to the extremity of the hypotheca; well preserved specimens of this species commonly contain yellowish green rounded organic bodies preserved within the test.
Size (average): Total length 279 µm. Test 60 µm X 39 µm. Length of epithecal spine 135 µm, breadth 3--9 µm. Length of hypothecal spines 81 µm and 75 µm.
Affinities:
Pocock, 1972, p. 78: The major difference between this species and other similar forms lies in the presence in this species of well defined bulges at the ends of the spines nearest the theca.
Supplemental description: Jansonius, 1986, p.213
(Holotype) ca 260 µm overall length; central body ovoidal; with three horns. Horns with a distinct swelling at about 1/3 their length away from the body, which locally doubles their width; in these swellings slender elongate "windows" of thinner wall can be observed. In 1962 the type specimen was not illustrated in full. (Plate 3, fig. 11 is a composite of four separate exposures.)