Revision of Lithostrotionella - USGS

22 REVISION OF LITHOSTROTIONELLA FROM THE CARBONIFEROUS AND PERMIAN
Diagnosis.- Cerioid Acrocyathus with corallite
diameter 15 to 20 mm and 22 to 26 major septa that
commonly reach the columella but seldom extend into
the dissepimentarium. Minor septa absent or poorly
developed. Columella seemingly simple to complex.
Dissepimentarium composed of 1 to 3 rows of mostly
large inflated dissepiments. Tabulae complete, conical,
and spaced about 0.5 mm apart. Ratio of tabularium
width to corallite diameter about 0.6. Mode of increase
unknown.
Description of holotype. -See Zhizhina (in Bul'vanker
and others, 1960).
Discussion. -At first glance, the transverse section of
this species suggests Stelechophyllum, but the tabulae
are clearly of the Acrocyathus type, and the axial structures
in some corallites appear to be complex.
Occurrence. -Lower Carboniferous, middle or upper
Visean. Zone C 1 vf, Donetz Basin, U.S.S.R.
Acrocyathus cystosus (Zhizhina in Bul'vanker and others)
Eolithostrotionella cystosa Zhizhina in Bul'vanker and others, 1960, p.
250, pl. 61, figs. la, b.
Diagnosis.- Cerioid Acrocyathus with corallite
diameter 20 to 30 mm and 28 to 38 major septa that may
or may not extend to the columella and seldom extend
into the dissepimentarium. Minor septa poorly
developed. Columella seemingly simple to complex.
Dissepimentarium composed of as many as 5 rows of
dissepiments of varying sizes. Tabulae complete, conical,
and spaced about 0.5 mm apart. Ratio oftabularium
width to corallite diameter about 0.4 to 0.5. Mode of increase
unknown.
Description of holotype. - See Zhizhina (in Bul'vanker
and others, 1960).
Discussion. -This species is distinguished by its broad
dissepimentarium.
Occurrence.- Lower Carboniferous, lower to upper.
Visean. Zones C 1
vb to C 1
vf, Donetz Basin, U.S.S.R.
Acrocyathus lissitzini (Zhizhina in Bul'vanker and
others)
Eolithostrotionella lissitzini Zhizhina in Bul'vanker and others, 1960,
p. 252, pl. 61, figs. 3a, b.
Diagnosis.- Cerioid Acrocyathus with corallite
diameter 15 to 20 mm and 18 to 25 major septa that approach
the columella but seldom reach it and seldom extend
into the dissepimentarium. Minor septa absent.
Columella seemingly simple to complex. Dissepimentarium
composed of 1 to 3 rows of dissepiments of varying
sizes. Tabulae complete, conical, and spaced about 1
mm apart. Ratio of tabularium width to corallite
diameter about 0.4 to 0.5. Mode of increase unknown.
Description of:holotype. -See Zhizhina (in Bul'vanker
and others, 1960),.
Occurrence. -Lower Carboniferous, middle or upper
Visean. Zone C 1 vf, Donetz Basin, U.S.S.R.
Acrocyathus hsujiulingi (Yoh)
Lithostrotionella hsujiulingi Yoh, 1961, p. 8, 16, pl. 13, figs. la-c.
Diagnosis.- Cerioid Acrocyathus with corallite
diameter averaging 6 mm and about 16 major septa that
approach the columella but seldom reach it and do not
extend into the dissepimentarium. Minor septa well
developed. Columella composed of a thickened axial
plate joined to the counter septum, septal lamellae, and
concentric traces of tabulae in transverse section.
Dissepimentarium composed of a single row of dissepiments
of varying sizes. Tabulae complete, conical,
and spaced about 0.5 mm apart. Ratio of tabularium
width to corallite diameter about 0.5. Mode of increase
seemingly peripheral.
Description of holotype.- See Yoh (1961).
Discussion. -This species differs from the other
Chinese species, A.? unicus, in having fewer major septa,
fewer rows of dissepiments, and a somewhat more
complex columella.
Occurrence. -Lower Carboniferous(?), Kwangsi Province,
China.
Acrocyathus? unicus (Y abe and Hayasaka)
Lithostrotion (Lithostrotionella) unicum Yabe and Hayasaka, 1915, p.
133; 1920, p. 11, pl. 9, figs. 12a, b.
Lithostrotionella unica Yabe and Hayasaka. Wu in Yii and others,
1963, p. 86, pl. 24, figs. 7a, b.
Lithostrotionella unicum Yabe and Hayasaka. Minato and Kato, 197 4,
p. 72, pl. 15, fig. 1.
Diagnosis. - Cerioid Acrocyathus? with corallite
diameter averaging 7 mm and about 22 to 26 major septa
that approach the columella but seldom reaeh it and
seldom extend into the dissepimentarium. Minor septa
well developed. Columella seemingly a simple axial plate
augmented by a few axial tabellae and septal ]ameBae.
Dissepimentarium composed of 1 to 3 rows of large inflated
dissepiments. Tabulae complete, conical, and
spaced 6 to 7 in 2 mm. Ratio of tabularium width to corallite
diameter about 0.5. Mode of increase unknown.
Description of holotype. -See Y abe and Hayasaka
(1915, 1920) and Minato and Kato (1974).
Discussion. -This species, the type of Lithostrotionella,
is referred to Acrocyathus with query because
of uncertainty concerning the morphology of the type
specimen (see previous discussion on page 4).
Occurrence.- Carboniferous(?), Yun-nan Province,
China.
Acrocyathus? shimeri (Crickmay)
Lithostrotion pennsylvanicum Shimer, 1926, p. 27 [part].
Lonsdaleia shimeri Crickmay, 1955, 1961, p. 13, pl. 1, figs. 9, 10.