CATALOG OF ORIGINAL DESCRIPTIONS: Lamprocyclas maritalis ventricosa Nigrini 1968

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 -> Lamprocyclas -> Lamprocyclas maritalis ventricosa
Other pages this level: L. bajaderae, L. deflorata, L. dentata, L. hadros, L. heteroporos, L. inexpectata, L. intermedia, L. maritalis, L. maritalis antiqua, L. maritalis maritalis, L. maritalis polypora, L. maritalis teraphimis, L. maritalis ventricosa, L. matakohe, L. nuptialis, L. particollis, L. prionotocodon, L. reginae, L. saltatricis

Lamprocyclas maritalis ventricosa

Citation: Lamprocyclas maritalis ventricosa Nigrini 1968
Rank: sub-species
Type specimens: pl.1, fig.9
Type repository: Holotype n°650034, U.S. National Museum, Washington, D.C.
Described on page(s) : p.57
Family (traditional): Pterocorythidae
Family (modern): Pterocorythidae

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Current identification/main database link: Lamprocyclas maritalis ventricosa Nigrini 1968


Original Description
Shell campanulate, rather thick-walled, rough. Cephalis trilocular with numerous small sub-circular pores and a stout 3-bladed apical horn, 1 to 2 times the cephalic length. Primary lateral and dorsal spines continue as ribs in the thoracic wall and may become external, forming small wings. Collar stricture not pronounced. Thorax inflated conical with hexagonally framed. circular to subcircular pores. aligned longitudinally, 11-14 across the widest part of the segment. Lumbar stricture distinct. Abdomen inflated cylindrical, much larger than the thorax. Pores hexagonally framed, circular to sub-circular, larger than thoracic pores, arranged in longitudinal rows, 3-9 (usually 5-9) in a vertical series, 11-14 on a half-equator. Peristome often small, but clearly differentiated, pore-less, with numerous acute, sometimes forked teeth arising from its lower edge; sometimes teeth are rudimentary or absent. Subterminal teeth, on the abdomen just above the peristome, are divergent, small and thornlike.

Length of apical horn 54-81µm, of cephalis 36-45µm of thorax 54-63µm, of abdomen (excluding peristome and terminal teeth) 72-127µm. Maximum breadth of cephalis 36-45µm, of thorax 108-127µm of abdomen 156-193µm. Distinguishing characters (rw): This subspecies is distinguished from Lamprocyclas maritalis maritalis Haeckel and Lamprocyclas maritalis Haeckel polypora Nigrini by its larger abdomen. At the lower limit of its abdominal dimensions, it grades into L. maritalis polypora, hence an arbitrary minimum abdominal breadth of 150µm has been selected for L. maritalis ventricosa. In Indian Ocean material, Nigrini (in press) found that the average abdominal breadth of L. maritalis polypora is 123µm (range 119-136µm).
The distribution shown in text-figure 10 roughly corresponds to a plot of average abdominal size, based on 10 measured specimens of Lamprocyclas maritalis from each sample. In the area of few L. maritalis ventricosa the average abdominal breadth is >150µm, whereas it is <150µm in the area of rare or absent L. maritalis ventricosa.

References:

Nigrini, C. A. (1968). Radiolaria from eastern tropical Pacific sediments. Micropaleontology. 14(1): 51-63. gs


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Lamprocyclas maritalis ventricosa compiled by the radiolaria@mikrotax project team viewed: 14-4-2021

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