Goniophorus scotti Lambert, 1926
Plate: GoSc-10
Series: Lower Cretaceous Group: Washita Formation: Duck Creek
Locale: Unknown County: Unknown Stage: Albian
Length: 5.2 mm Width: 5.1 mm
Specimen in photo: Collection of Chris Garvie (The Akers Collection)
Repository: Private Collection
HOLOTYPE INFO:
Holotype: BEG 20539 (Syntypes) — Non-vertebrate Paleontology Laboratory, University of Texas (Ikins, 1940)
Locality: 2.5 miles north of Denison, Grayson County, Texas (Ikins, 1940)
SYSTEMATIC PALEONTOLOGY – TAXONOMY
Class: Echinoidea Leske, 1778
Subclass: Euechinoidea Bronn, 1860
Infraclass: Carinacea Kroh & Smith, 2010
Superorder: Calycina Gregory, 1900
Order: Salenioida Delage & Hérouard, 1903
Family: Saleniidae L. Agassiz, 1838
Subfamily: Hyposaleniinae Mortensen, 1934
Genus: GONIOPHORUS L. Agassiz, 1838
Species: Goniophorus scotti Lambert, 1926
TYPE SPECIES: Goniophorus lunulatus L. Agassiz, 1838
STRATIGRAPHICAL OCCURRENCE & DISTRIBUTION
Group: Washita
Formations: Duck Creek Formation
Stratigraphic Units: Lower Cretaceous, Albian
Counties: Grayson County (Type Locality)
DESCRIPTION
TOP: Length, width, height: 5.2 mm L × 5.1 mm H
Top shape: Circular from top; round
Top domed: Slightly pointed on top
SIDE: Ambitus: At midpoint
Side shape: Inflated; sides steep like sides of barrel, rounded
BOTTOM: Bottom flat: Bottom flat; slightly convex
AMB: Amb shape: Flexuous, lanceolate; widest below ambitus
Amb primary tubercles: Two rows of tubercles down center of each ambulacrum
Amb granules: Two alternating rows of granules between tubercles
INTERAMB: Interamb width: 5 times wider than ambulacra
Interamb plating: Alternating plates
Interamb primary tubercles: Two rows of staggered tubercles with four in each row
PORE PAIRS: Shape: Round
Arrangement: Uniserial, offset
TUBERCLES: Primary Crenulate: Yes
Primary Areola shape: Sunken
Primary Boss: Raised
Primary Mamelon: Large, rounded, flat on top
Secondary tubercles: Scrobicular tubercles surround each large tubercle along edges of plates
APICAL SYSTEM: Size: Very large; close to 60% of test from top
Shape: Somewhat pentagonal; outer edge much more scalloped than pentagonal; sits raised on corona
Plates: 5 oculars, 5 genitals, 1 suranal. Genitals pentagonal shaped, both sides parallel, pointed at margin. Oculars flattened hexagonal shape. Ten plates on outer edge
Ornamentation: Each genital plate perforated with few granules
PERIPROCT (ANUS): Shape & Size: Triangular, slightly oval; covers 35% of apical disc
PERISTOME (MOUTH): Size: Diameter about 1/3rd of base
Shape: Rounded
Lip: Notched; notches only slightly developed
SPECIMENS STUDIED & CONDITION
Specimen in Chris Garvie Collection (Akers Collection); small size (5.2 mm) suggests juvenile .
ETYMOLOGY: Named in honor of Professor Gayle Scott (1894–1948), paleontologist at Texas Christian University (Ikins, 1940).
REMARKS & COMPARISONS
Remarks: According to Smith & Kroh (2011), Goniophorus whitneyi is a synonym of Goniophorus scotti.
Plate: GoSc-10
Series: Lower Cretaceous Group: Washita Formation: Duck Creek
Locale: Unknown County: Unknown Stage: Albian
Length: 5.2 mm Width: 5.1 mm
Specimen in photo: Collection of Chris Garvie (The Akers Collection)
Repository: Private Collection
HOLOTYPE INFO:
Holotype: BEG 20539 (Syntypes) — Non-vertebrate Paleontology Laboratory, University of Texas (Ikins, 1940)
Locality: 2.5 miles north of Denison, Grayson County, Texas (Ikins, 1940)
SYSTEMATIC PALEONTOLOGY – TAXONOMY
Class: Echinoidea Leske, 1778
Subclass: Euechinoidea Bronn, 1860
Infraclass: Carinacea Kroh & Smith, 2010
Superorder: Calycina Gregory, 1900
Order: Salenioida Delage & Hérouard, 1903
Family: Saleniidae L. Agassiz, 1838
Subfamily: Hyposaleniinae Mortensen, 1934
Genus: GONIOPHORUS L. Agassiz, 1838
Species: Goniophorus scotti Lambert, 1926
TYPE SPECIES: Goniophorus lunulatus L. Agassiz, 1838
STRATIGRAPHICAL OCCURRENCE & DISTRIBUTION
Group: Washita
Formations: Duck Creek Formation
Stratigraphic Units: Lower Cretaceous, Albian
Counties: Grayson County (Type Locality)
DESCRIPTION
TOP: Length, width, height: 5.2 mm L × 5.1 mm H
Top shape: Circular from top; round
Top domed: Slightly pointed on top
SIDE: Ambitus: At midpoint
Side shape: Inflated; sides steep like sides of barrel, rounded
BOTTOM: Bottom flat: Bottom flat; slightly convex
AMB: Amb shape: Flexuous, lanceolate; widest below ambitus
Amb primary tubercles: Two rows of tubercles down center of each ambulacrum
Amb granules: Two alternating rows of granules between tubercles
INTERAMB: Interamb width: 5 times wider than ambulacra
Interamb plating: Alternating plates
Interamb primary tubercles: Two rows of staggered tubercles with four in each row
PORE PAIRS: Shape: Round
Arrangement: Uniserial, offset
TUBERCLES: Primary Crenulate: Yes
Primary Areola shape: Sunken
Primary Boss: Raised
Primary Mamelon: Large, rounded, flat on top
Secondary tubercles: Scrobicular tubercles surround each large tubercle along edges of plates
APICAL SYSTEM: Size: Very large; close to 60% of test from top
Shape: Somewhat pentagonal; outer edge much more scalloped than pentagonal; sits raised on corona
Plates: 5 oculars, 5 genitals, 1 suranal. Genitals pentagonal shaped, both sides parallel, pointed at margin. Oculars flattened hexagonal shape. Ten plates on outer edge
Ornamentation: Each genital plate perforated with few granules
PERIPROCT (ANUS): Shape & Size: Triangular, slightly oval; covers 35% of apical disc
PERISTOME (MOUTH): Size: Diameter about 1/3rd of base
Shape: Rounded
Lip: Notched; notches only slightly developed
SPECIMENS STUDIED & CONDITION
Specimen in Chris Garvie Collection (Akers Collection); small size (5.2 mm) suggests juvenile .
ETYMOLOGY: Named in honor of Professor Gayle Scott (1894–1948), paleontologist at Texas Christian University (Ikins, 1940).
REMARKS & COMPARISONS
Remarks: According to Smith & Kroh (2011), Goniophorus whitneyi is a synonym of Goniophorus scotti.
