Type species:Quinqueremis arundinea Nazarov and Ormiston (monotypy)
Description:Latentifistulidae having an internal framework in the form of a nonporous sphere with five hollows rays. Four rays usually radiating from the sphere at angles of 90°, the fifth perpendicular to them. The internal frame enclosed primarily in spongy shell. External form of the skeleton showing five subcylindrical arms radiating from a rounded central area.
Definition of Family Latentifistulidae Nazarov and Ormiston, 1983, p. 371: Latentifistulidea having an internal framework in the form of a hollow sphere with three to five, rarely more, hollow rays. These rays emerge from the sphere at various angles, thereby determining the similarly varied symmetry of the external shell outline. External skeleton consisting of three, four, five or more subcylindrical rays (lobes) radiating from the central area.
Remarks: From other genera of the family, Quinqueremis n. g. differs in the five-armed skeletal form. There are several species. In the present paper only the type species is described. The first representatives of this genus are known from the Gzhelian Stage of the Upper Carboniferous. They are not abundant and, as a rule, are poorly preserved. This prevents a clarification of their structural peculiarities. Also, individual specimens were encountered in the lower part of the Asselian and Sakmarian stages of the S. Urals. Only at the base of the Artinskian does Quinqueremis become more abundant and varied. It is not found at the top of the Baigendzhinian Substage.
Stratigraphic range:Upper Carboniferous (rare) to Lower Permian of the S. Urals; Upper Permian of W. Texas.
Etymology:From the Latin quinqueremis = five-oared galley.
Subsequent descriptions:YES

Description and dimensions:A species of Quinqueremis with uniform structure and dimensions of the five rays which are provided with a distinct, conical terminal spine. Arms long, spongy, with short terminal spines. Internal sphere located at some distance from the shell which unites with the base of the external arm. Hollow rays emanating from the sphere are half open in their basal part or appear cut by a deep furrow. Gradually they transform to a rod-like beam which unites with the base of the terminal spine. External arms differentiated in the basal part, spongy, more rarely platy. In their central area, the arms gradually expand and their greatest diameter is observed in the distal part. Here the arms are strongly inflated (swollen) or inflated for only half of the arm as a result of which they have the form of lobes. Terminal spines conical, in some specimens enclosed in a spongy mass. The skeletal fabric of all arms represented by irregularly interwoven fine fibers. From other species of the genus, Q. arundinea is distinguished by the similar structure and dimensions of all rays and the clear expression of terminal spines.       Length of rays from internal sphere 760-1408µm, diameter of external arms 50-180µm, diameter of internal sphere 45-55µm, diameter of rays emanating from internal sphere 8-24µm, length of terminal spines 14-55µm.

Repository:Holotype: GIN 4673/26, Geological Institute of the Academy of Sciences, Moscow, Russia.
Type locality:Little Suren River, S. Urals, Bashkiria, Russia.
Original stratigraphic range:Aktastinian Substage, Artinskian Stage, Lower Permian. Paleozoic.
Etymology:From the Latin arundineus = cane- or reed-like.
Subsequent descriptions:?

Literature cited:- Nazarov, B. B. and A. Ormiston (1983). A new superfamily of stauraxon polycystine Radiolaria from the Late Paleozoic of the Soviet Union and North America. Senckenbergiana Lethaea 64(2/4): 363-379.