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Hsuum lucidum

Radiolaria - Nassellaria - Hsuidae


Original description: Test conical, lobate, pointed apically, usually with six to seven post-abdominal chambers. Cephail small, conical, without rudimentary horn. Cephalis and thorax covered with layer of microgranular silica. Abdomen and post-abdominal chambers rapidly increasing in width, gradually increasing in length as added. Post-abdominal chambers with inner layer of massive tetragonal pore frames with small circular pores: outer layer of mesh work with short, moderately massive costae. Costae mostly occurring on joints of chambers.

Original remarks: Hsuum() lucidum n. sp differs from H. parasolensi Pessagno and Whalen by lacking a horn on cephalis, and by having a more conical test with less massive costae.

Etymology: Lucidus-a-um (Latin, adj.) bright.

Hsuum lucidum was named by Yeh (1987). Its type specimen is NMNS (000085) and is a 3D body fossil. Its type locality is Suplee-Izee area, OR-600A, which is in a Toarcian marine tuff/limestone in the Hyde Formation of Oregon.

It was recombined as Transhsuum lucidum by Gorican et al. (2003).

Synonymy list
YearName and author
1987Hsuum lucidum Yeh
1987Hsuum validum Yeh p. 66 figs. Pl. 3, fig. 26; Pl. 5, figs. 17, 22; Pl. 17, fig. 12, pl. 28, fig. 1
2003Transhsuum lucidum Gorican et al.
2004Hsuum lucidum Matsuoka

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phylumRetariaCavalier-Smith 1999
classRadiolariaMüller 1858
superorderPolycystina(Ehrenberg 1867)
orderNassellariaEhrenberg 1875
superfamilyArchaeodictyomitraceaPessagno 1976
genusHsuumPessagno 1977

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

No diagnoses are available