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Linked specimens: USNM-689279 USNM-689278
Current identification/main database link: Archaeoglobigerina blowi Pessagno 1967
Test trochoid: lobulate peripherally. Chambers spherical. nearly as elongate as wide: about four or five in last whorl, rapidly increasing in size. Coiling predominantly dextral; sutures depressed, radial. straight to slightly curved spirally and umbilically. Umbilicus medium-sized and deep covered by tegilla with intralaminal and infralaminal accessory apertures in well-preserved specimens. Periphery occasionally with weakly developed double keel which occurs chiefly on the first one or two chambers of the final whorl. but usually keel-less with or without an imperforate peripheral band: nontruncate. Test surface either smooth throughout or somewhat rugose on the earlier chambers; last two or three chambers usually smooth irregardless of previous ornamentation. Primary aperture interiomarginal, umbilical in position. Outer wall except for rugosities, keels, and imperforate peripheraI band. raclial hyaline, perforate: rugosities ultragranular hyaline. imperforate; keels radial hyaline and ultragrnnular hyaline. imperforate; peripheral band radial hyaline imperforate.
Etymology: This species is named after W. H. Blow in honor of his contributionsto the geology of the West Indies and to micropaleontology.
Extra details from original publication
Remarks.- A. blowi Pessagno. n. sp. is closely related to A. cretacea (d'Orbigny). lt differs from the latter species (1) by possessing more spherical and inflated chambers which are nearly as wide as long and by showing a more rapid increase in chamber size. and (2) by having a markedly lobate periphery. Transitional forms between these two species are common at some horizons.
A. blowi Pessagno, n. sp. differs from A. bosquensis Pessagno. n. sp. (1) by being lower spired; (2) by having four or five rather than six or seven chambers in the last whorl; (3) by having a larger umbilicus; (4) by displaying chiefly dextral coiling; and (5) by showing a more rapid increase in chamber size.
Archaeoglobigerina blowi Pessagno, n. sp. gave rise to Rugoglobigerina rugosa (Plummer) and most likely to Rugoglobigerina tradinghousensis Pessagno, n. sp. in Early Campanian or Taylorian times through the development of meridonially arranged rugosities.
Archaeoglobigerina blowi compiled by the pforams@mikrotax project team viewed: 24-7-2021
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