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Dendrospyris binapertonis Goll , 1968

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DENDROSPYRIS BINAPERTONIS n. sp. Goll 1968 p. 1420; pl. 173, fig. 5, 6, 10, 11

Sagittal ring subcircular; 54 to 70μ high; 28 to 48μ thick; joined directly to front, apex, and back of lattice shell. Apical and vertical spines short; no frontal or axial spines. Some specimens have no sternal bar; in other skeletons, all eight basal-connector bars joined to basal ring. Basal ring oval, having lateral and sagittal indentations ; 33 to 64μ wide; 27 to 37μ thick; encloses six basal pores. Three or four basal spines circular in cross section; 12 to 55μ long; project from basal ring; taper to simple point or have irregularly branched ends. Basal spine adjacent to each of frontal and primary-lateral bars; some specimens have basal spine adjacent to sternal bar. In some forms, short auxiliary spines project laterally from proximal ends of basal spines adjacent to primary-lateral bars. Lattice shell 75 to 100μ wide; not extending below basal ring; slightly constricted sagittally; has appearance of smooth, thin sheet perforated by subcircular, widely spaced lattice pores 4 to 28μ in diameter. Variable number of lattice bars joined to sagittal or basal rings. Sternal pore present; frontal and vertical pores absent.

A species of Dendrospyris characterized by six basal pores, sternal pore, and a lattice shell that is joined directly to the front, apex, and back of the sagittal ring and does not extend below the basal ring.

The trivial name is derived from the Latin words bis, meaning two, and apertonis, meaning opening.

Representatives of Dendrospyris binapertonis n. sp. differ from those of D. damaecornis (Haeckel) and Tholospyris scaphipes (Haeckel) in having a sternal pore, and from those of D. pododendros (Carnevale) in having no frontal pore. Specimens of the type-species of Dendrospyris, D. stylophora (Ehrenberg), have tubercles and long apical spine. Some specimens of D. stylophora have a frontal pore.

Dendrospyris binapertonis is represented in 13 of the 17 samples between MSN 132P, 90-92 cm. (middle Miocene) and AMPH 9P, 364-366 cm. (late Pliocene).
Holotype: USNM 650357, from core sample MSN 143P, 890-892 cm. (middle Pliocene).

5,6,10,11—Dendrospyris bmapertonis Goll, n. sp. Back, left-side, basal, and front views, respectively, of holotype. USNM 650357; core sample MSN 143P, 890-892 cm. X300
Goll 1968











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