radiolaria - rads_cat - Lamprocyrtis neoheteroporos radiolaria - rads_cat - Lamprocyrtis neoheteroporos

CATALOG OF ORIGINAL DESCRIPTIONS: Lamprocyrtis neoheteroporos Kling 1973

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 -> L -> Lamprocyrtis -> Lamprocyrtis neoheteroporos
Other pages this level: L. daniellae, L. datureacornis, L. haysi, L. neoheteroporos

Lamprocyrtis neoheteroporos

Citation: Lamprocyrtis neoheteroporos Kling 1973
taxonomic rank: species
Described on page(s) : p.639
Type specimens: pl.5, figs.17, pl.15, figs.4-5
Family (traditional): Pterocorythidae
Family (modern): Pterocorythidae

Current identification/main database link: Lamprocyrtis neoheteroporos Kling 1973


Original Description

Two segmented forms with cephalis [three-lobed,] hemispherical to cylindrical, commonly open; with a stout three-bladed apical horn and usually one or more accessory spines; with circular to elliptical, irregularly arranged pores. Collar stricture indistinct. Thorax proximally conical, distally cylindrical to slightly inflated; circular to elliptical or irregular pores, longitudinally aligned, increasing in size distally, becoming two or more times as large along a horizontal discontinuity as in L. heteroporos. Smaller pores may again appear near mouth. Although early specimens show a slight, gentle indentation of the wall at this discontinuity, there is no internal stricture or septal ring separating two segments. Mouth, sometimes slightly constricted, surrounded by irregular row of small teeth; a weak peristome seldom developed. Later specimens become smaller and more inflated.

Size:
Based on 15 specimens. Maximum width 74-90 µ, length from top of cephalis 100-130 µ, proximal pore diameter 2-14 µ, (average near upper value), distal pore diameter 6-28 µ (average near upper value).

Extra details from original publication
Distinguishing characters: The pores in the proximal part of the postcephalic shell are small, and distally they are two to three times as large, the change occurring abruptly as at an intersegmental boundary which is however not marked by an internal stricture. (Riedel and Sanfilippo, 1978a)

This species is distinguished from L. heteroporos by the absence of a lumbar constriction with an internal septal ring. It differs from L. nigriniae in having a transverse discontinuity across which the pore size differs by a factor of two or more. (Sanfilippo et al., 1985)

Phylogeny: L. neoheteroporos arose from L. heteroporos, and evolved into L. nigriniae. See also discussion under Phylogeny of L. heteroporos

Editors' Notes
The shell is two-segmented, but shows evidence of its three-segmented ancestor by an abrupt increase in pore size (by a factor of two or more) between the upper and lower parts of the present thorax. The species varies from a compact, small (100 microns in length) form with heavy bars between pores, to a larger form (140 microns in length) with more open lattice and lighter bars. (Sanfilippo et al., 1985)

References:

Kling, S. A. (1973). Radiolaria from the eastern North Pacific, Deep Sea Drilling Project, Leg 18. Initial Reports of the Deep Sea Drilling Project. 18: 617-671. gs


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Lamprocyrtis neoheteroporos compiled by the radiolaria@mikrotax project team viewed: 3-3-2024

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