CATALOG OF ORIGINAL DESCRIPTIONS: Tripocalpis cassidus Nishimura 1992

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: rads_cat -> T -> Tripocalpis -> Tripocalpis cassidus
Other pages this level: T. cassidus, T. cortinaris, T. plectaniscus, T. simplex, T. tricostata, T. triserrata

Tripocalpis cassidus

Citation: Tripocalpis cassidus Nishimura 1992
Rank: species
Type specimens: pl.3, figs.8; pl.12, fig.12
Type repository: Holotype n° LMMN AN0025-7, Laboratory of the Microfossil's study of Matsumoto, Nagano, Japan.
Described on page(s) : p.330
Family (traditional): Plagiacanthidae
Family (modern): Clathromitridae

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Current identification/main database link: Tripocalpis cassidus Nishimura 1992

Original Description
Shell flattened-campanulate, bearing a very short conical apical horn. Three terminal feet, three-bladed in section, are considerably curved inward, with a pair of pores near the base. Small projections from the peristome might represent a velum. Pores of shell rather small, almost regular in size and arrangement. A specialized pore or a quite short tube marked by thickened rim is situated near the proximal part of one of the feet.

(Based on specimens of 7) Height of cephalis 84-90 µ and width of cephalis 120-130 µ. Distinguishing characters (rw): This species is distinguished from Spongomelissa adunca by having only one segment, not pronouncedly lobate. It also differs from Tripocalpis simplex, in a large flatly cup-shaped cephalis and in its more pronouncedly curved feet.

Etymology: cassidusis derived from the Latin, meaning helmet.


Nishimura, A. (1992). Paleocene radiolarian biostratigraphy in the northeast Atlantic at Site 384, Leg 43, of the Deep Sea Drilling Project. Micropaleontology. 38(4): 317-362. gs


Tripocalpis cassidus compiled by the radiolaria@mikrotax project team viewed: 8-3-2021

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