Archaeocidaris marmorcataractensis Thompson, Crittenden, Schneider, & Bottjer, 2015
Archaeocidaris marmorcataractensis Thompson, Crittenden, Schneider, & Bottjer, 2015
Plate: ArMa-10
Series: Pennsylvanian Group: Bend Formation: Marble Falls
Locale: Rough Creek County: San Saba Stage: Bashkirian
Length: 69.5 mm Height: (Not specified) Specimen in photo: TMM NPL 64598
Repository: Non-vertebrate Paleo. Lab., Univ. of Texas
HOLOTYPE INFO:
Holotype: TMM NPL 64598 — Non-vertebrate Paleontology Laboratory, University of Texas (Thompson et al., 2015)
Locality: Rough Creek, San Saba County, Texas (Thompson et al., 2015)
Systematic Paleontology
CLASS: ECHINOIDEA Leske, 1778
SUBCLASS: PERISCHOECHINOIDEA M'Coy, 1849
ORDER: ARCHAEOCIDAROIDA Vadet, 1988
FAMILY: ARCHAEOCIDARIDAE McCoy, 1844
GENUS: ARCHAEOCIDARIS McCoy, 1844
SPECIES: Archaeocidaris marmorcataractensis Thompson, Crittenden, Schneider, & Bottjer, 2015
TYPE SPECIES: Cidaris urii Fleming, 1828
STRATIGRAPHICAL OCCURRENCE & DISTRIBUTION
Group: Bend
Formations: Marble Falls Formation (Thompson et al., 2015)
Stratigraphic Units: Lower Pennsylvanian, Bashkirian (Thompson et al., 2015)
Counties: San Saba County
DESCRIPTION
TOP: Length: 69.5 mm Length
Top shape: Regular; likely wider than tall; large
AMB: Amb plates: Simple, rounded edges
INTERAMB: Interamb plate shape: Hexagonal; wider than tall
SUTURES: Primary Perforated: Yes
Primary Crenulate: No
Primary Areola shape: Sunken area between parapet and mamelon
Primary Boss: Parapet pronounced
TUBERCLES: Primary tubercles: Large tubercle on each plate
Secondary tubercles: Imperforate scrobicular tubercles
APICAL SYSTEM: Size / Location: Unknown
PERIPROCT (ANUS): Location: Unknown
PERISTOME (MOUTH): Lantern: Lantern disarticulated; hemipyramids wide
SPINES: Shape: Shafts circular to ovate; most spines straight, some slightly curved
Ornamentation: Thorn-shaped spinules
SPECIMENS STUDIED & CONDITION
Specimen condition: Holotype TMM NPL 64598 .
REMARKS & COMPARISONS
Remarks: Archaeocidaris marmorcataractensis is the fourth species of Archaeocidaris described from relatively complete test material from the Pennsylvanian of North America (Thompson et al., 2015). The specific epithet refers to the Marble Falls Formation (marmor = marble, cataract = falls).
Comparisons: Distinguished from other Pennsylvanian species by the specific morphology of the spines (thorn-shaped spinules) and the wide hemipyramids of the lantern (Thompson et al., 2015).
Archaeocidaris marmorcataractensis Thompson, Crittenden, Schneider, & Bottjer, 2015
Plate: ArMa-10
Series: Pennsylvanian Group: Bend Formation: Marble Falls
Locale: Rough Creek County: San Saba Stage: Bashkirian
Length: 69.5 mm Height: (Not specified) Specimen in photo: TMM NPL 64598
Repository: Non-vertebrate Paleo. Lab., Univ. of Texas
HOLOTYPE INFO:
Holotype: TMM NPL 64598 — Non-vertebrate Paleontology Laboratory, University of Texas (Thompson et al., 2015)
Locality: Rough Creek, San Saba County, Texas (Thompson et al., 2015)
Systematic Paleontology
CLASS: ECHINOIDEA Leske, 1778
SUBCLASS: PERISCHOECHINOIDEA M'Coy, 1849
ORDER: ARCHAEOCIDAROIDA Vadet, 1988
FAMILY: ARCHAEOCIDARIDAE McCoy, 1844
GENUS: ARCHAEOCIDARIS McCoy, 1844
SPECIES: Archaeocidaris marmorcataractensis Thompson, Crittenden, Schneider, & Bottjer, 2015
TYPE SPECIES: Cidaris urii Fleming, 1828
STRATIGRAPHICAL OCCURRENCE & DISTRIBUTION
Group: Bend
Formations: Marble Falls Formation (Thompson et al., 2015)
Stratigraphic Units: Lower Pennsylvanian, Bashkirian (Thompson et al., 2015)
Counties: San Saba County
DESCRIPTION
TOP: Length: 69.5 mm Length
Top shape: Regular; likely wider than tall; large
AMB: Amb plates: Simple, rounded edges
INTERAMB: Interamb plate shape: Hexagonal; wider than tall
SUTURES: Primary Perforated: Yes
Primary Crenulate: No
Primary Areola shape: Sunken area between parapet and mamelon
Primary Boss: Parapet pronounced
TUBERCLES: Primary tubercles: Large tubercle on each plate
Secondary tubercles: Imperforate scrobicular tubercles
APICAL SYSTEM: Size / Location: Unknown
PERIPROCT (ANUS): Location: Unknown
PERISTOME (MOUTH): Lantern: Lantern disarticulated; hemipyramids wide
SPINES: Shape: Shafts circular to ovate; most spines straight, some slightly curved
Ornamentation: Thorn-shaped spinules
SPECIMENS STUDIED & CONDITION
Specimen condition: Holotype TMM NPL 64598 .
REMARKS & COMPARISONS
Remarks: Archaeocidaris marmorcataractensis is the fourth species of Archaeocidaris described from relatively complete test material from the Pennsylvanian of North America (Thompson et al., 2015). The specific epithet refers to the Marble Falls Formation (marmor = marble, cataract = falls).
Comparisons: Distinguished from other Pennsylvanian species by the specific morphology of the spines (thorn-shaped spinules) and the wide hemipyramids of the lantern (Thompson et al., 2015).
