CATALOG OF ORIGINAL DESCRIPTIONS: Streptochilus Bronniman & Resig 1971

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> S -> Streptochilus
Other pages this level: Schackoina, Schackoinella, Schackoinidae, Shastrina, Siderolina, Sigalia, Sigalitruncana, Sphaerogerinidae, Sphaeroidina, Sphaeroidinella, Sphaeroidinellinae, Sphaeroidinellopsis, Spiroplecta, Steineckia, Streptochilus, Subbotina,

Daughter taxa: (blue => in age window 0-300Ma)
= Streptochilus cetacensis
status uncertain
status uncertain
= Streptochilus inglei
= Streptochilus latus
= Streptochilus macdougallae
= Streptochilus mascarenensis
= Streptochilus pristinum
= Streptochilus rockallkiddensis
= Streptochilus subglobigerus
= Streptochilus tasmanensis
status uncertain

Streptochilus

Citation: Streptochilus Bronniman & Resig 1971
Rank: Genus
Type species: Bolivina tokelauae Boersma

Current identification/main database link: Streptochilus Bronnimann and Resig, 1971


Original Description
Test biserial, sometimes twisted; wall calcareous per- forate; aperture a high arch, eccentric in position, extending from the base of the last chamber onto the apertural face. On the outside margin, a collar borders the aperture. Near the base of the inside margin, the collar and apertural edge are turned inward, producing a plate-like connection with the proximal margin of the collar of the previous aperture. The length of the test varies between 75 and 300 microns.

Etymology: from streptos, Gr., twisted, + cheilos, Gr., lip, denoting the change to an inward directed lip.

Extra details from original publication
Remarks: This genus probably evolved from Chiloguembelina, which it resembles, through infolding of the inner margin of the aperture. In view of its apparent close affinity to Chiloguembelina, the rather simple modification of the interior does not seem to warrant exclusion of this genus from classification within the Heterohelicidae. No tooth plates, such as characterize the Bolivinitidae, occur in members of this genus, and no stage of development other than biserial was observed in any specimens assigned to this taxon.

Geologic range: Lower Miocene-Recent.

References:

Brönnimann, P. & Resig, J., (1971). A Neogene globigerinacean biochronologic time-scale of the southwestern Pacific. Deep Sea Drilling Project, 7(2): 1235-1469.


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Streptochilus compiled by the pforams@mikrotax project team viewed: 18-10-2018

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