Glyphocyphus garviei Thompson, 2016
Plate: GlGa-10
Series: Upper Cretaceous Group: Navarro Formation: Corsicana
Locale: Onion Creek County: Travis Stage: Maastrichtian
Length: 9.5 mm Width: 5.9 mm
Specimen in photo: NPL 70930 (Holotype)
Repository: Non-vertebrate Paleo. Lab., Univ. of Texas
HOLOTYPE INFO:
Holotype: NPL 70930 — Non-vertebrate Paleontology Laboratory, University of Texas
Locality: Onion Creek, southeast Travis County, Texas
SYSTEMATIC PALEONTOLOGY – TAXONOMY
Class: Echinoidea Leske, 1778
Subclass: Euechinoidea Bronn, 1860
Infraclass: Carinacea Kroh & Smith, 2010
Superorder: Echinacea Claus, 1876
Order: Temnopleuroida Mortensen, 1942
Infraorder: Temnopleuridea Kroh & Smith, 2010
Family: Glyphocyphidae Duncan, 1889
Genus: GLYPHOCYPHUS d'Archiac & Haime, 1853
Species: Glyphocyphus garviei Thompson, 2016
TYPE SPECIES: Glyphocyphus radiatus (Goldfuss, 1829)
DIAGNOSIS
A small Glyphocyphus very similar to Glyphocyphus radiatus of Europe with a smaller peristome, larger genital plates, narrower interambulacra in relationship to the ambulacra, and a much higher ambitus .
STRATIGRAPHICAL OCCURRENCE & DISTRIBUTION
Group: Navarro
Formations: Corsicana Formation
Stratigraphic Units: Upper Cretaceous, Maastrichtian
Counties: Travis County
Matrix: Solid gray clay
DESCRIPTION
TOP: Length, width, height: 9.5 mm L × 5.9 mm H
Top shape: Round from above
Flatness: Flat corona
SIDE: Ambitus: 45% from adoral surface
Side shape: Inflated
BOTTOM: Flat bottom
AMB: Amb shape: Lanceolate
Amb primary tubercles: Two rows of 16–17 staggered plates with one tubercle on each plate
Amb arrangement: Trigeminate plating, semicompound; tubercles on two of three plates
Sutures: Adradial and interradial zones very pronounced with dense rows of granulation. Pronounced large pitting below tubercles .
INTERAMB: Interamb width: 1.5 times size of ambulacra
Interamb primary tubercles: Two rows of 11–12 large staggered plates; one large tubercle centered on each plate
Sutures: Plates dense with granulation
PORE PAIRS: Arrangement: Uniserial; near peristome further spaced
TUBERCLES: Primary Perforated: Yes, Faintly
Primary Crenulate: Yes
Primary Areola shape: More sunken adorally; larger adorally
APICAL SYSTEM: Size: Fairly large
Shape: Oval; monocyclic plating
Plates: Genital plates pentagonal, points point out into center of interambs; Oculars seven-sided, outer edge flat against ambs
Genital pores: Five gonopores on outer edge of genital plates
PERIPROCT (ANUS): Shape & Size: Oval; large (2.6 mm × 2.0 mm)
PERISTOME (MOUTH): Size: Large; 3.7 mm × 3.5 mm (taking up 40% of diameter of test)
Shape: Slightly oval
Lip: Buccal notches weak
SPINES: Unknown
SPECIMENS STUDIED & CONDITION: One small perfect specimen found (Holotype NPL 70930) .
ETYMOLOGY: This species is named after Chris Garvie, a renowned paleontologist and author who found this specimen.
REMARKS & COMPARISONS
Remarks: Glyphocyphus garviei has a slightly smaller peristome, narrower interambulacra, and a much higher ambitus than Glyphocyphus radiatus. It has fewer sutural pits than G. radiatus and smaller mamelons on the adoral side.
Comparisons:
Remark: (02-26) Adkins, 1928 identified small (7.2 mm) temnopleurids in the Taylor Marl and Navarro sequences (specifically the Nacatoch Sand) and said they were of the genus Zeuglopleurus. Zeuglopleurus emmonsi (formerly Echinocyphus emmonsi) are known from S. Carolina. They cannot be this specimen because Zeuglopleurus are imperforate and non-crenulate.
Plate: GlGa-10
Series: Upper Cretaceous Group: Navarro Formation: Corsicana
Locale: Onion Creek County: Travis Stage: Maastrichtian
Length: 9.5 mm Width: 5.9 mm
Specimen in photo: NPL 70930 (Holotype)
Repository: Non-vertebrate Paleo. Lab., Univ. of Texas
HOLOTYPE INFO:
Holotype: NPL 70930 — Non-vertebrate Paleontology Laboratory, University of Texas
Locality: Onion Creek, southeast Travis County, Texas
SYSTEMATIC PALEONTOLOGY – TAXONOMY
Class: Echinoidea Leske, 1778
Subclass: Euechinoidea Bronn, 1860
Infraclass: Carinacea Kroh & Smith, 2010
Superorder: Echinacea Claus, 1876
Order: Temnopleuroida Mortensen, 1942
Infraorder: Temnopleuridea Kroh & Smith, 2010
Family: Glyphocyphidae Duncan, 1889
Genus: GLYPHOCYPHUS d'Archiac & Haime, 1853
Species: Glyphocyphus garviei Thompson, 2016
TYPE SPECIES: Glyphocyphus radiatus (Goldfuss, 1829)
DIAGNOSIS
A small Glyphocyphus very similar to Glyphocyphus radiatus of Europe with a smaller peristome, larger genital plates, narrower interambulacra in relationship to the ambulacra, and a much higher ambitus .
STRATIGRAPHICAL OCCURRENCE & DISTRIBUTION
Group: Navarro
Formations: Corsicana Formation
Stratigraphic Units: Upper Cretaceous, Maastrichtian
Counties: Travis County
Matrix: Solid gray clay
DESCRIPTION
TOP: Length, width, height: 9.5 mm L × 5.9 mm H
Top shape: Round from above
Flatness: Flat corona
SIDE: Ambitus: 45% from adoral surface
Side shape: Inflated
BOTTOM: Flat bottom
AMB: Amb shape: Lanceolate
Amb primary tubercles: Two rows of 16–17 staggered plates with one tubercle on each plate
Amb arrangement: Trigeminate plating, semicompound; tubercles on two of three plates
Sutures: Adradial and interradial zones very pronounced with dense rows of granulation. Pronounced large pitting below tubercles .
INTERAMB: Interamb width: 1.5 times size of ambulacra
Interamb primary tubercles: Two rows of 11–12 large staggered plates; one large tubercle centered on each plate
Sutures: Plates dense with granulation
PORE PAIRS: Arrangement: Uniserial; near peristome further spaced
TUBERCLES: Primary Perforated: Yes, Faintly
Primary Crenulate: Yes
Primary Areola shape: More sunken adorally; larger adorally
APICAL SYSTEM: Size: Fairly large
Shape: Oval; monocyclic plating
Plates: Genital plates pentagonal, points point out into center of interambs; Oculars seven-sided, outer edge flat against ambs
Genital pores: Five gonopores on outer edge of genital plates
PERIPROCT (ANUS): Shape & Size: Oval; large (2.6 mm × 2.0 mm)
PERISTOME (MOUTH): Size: Large; 3.7 mm × 3.5 mm (taking up 40% of diameter of test)
Shape: Slightly oval
Lip: Buccal notches weak
SPINES: Unknown
SPECIMENS STUDIED & CONDITION: One small perfect specimen found (Holotype NPL 70930) .
ETYMOLOGY: This species is named after Chris Garvie, a renowned paleontologist and author who found this specimen.
REMARKS & COMPARISONS
Remarks: Glyphocyphus garviei has a slightly smaller peristome, narrower interambulacra, and a much higher ambitus than Glyphocyphus radiatus. It has fewer sutural pits than G. radiatus and smaller mamelons on the adoral side.
Comparisons:
- G. mespilia: G. garviei is very inflated compared to G. mespilia; buccal notches are less pronounced.
- G. difficilis & G. mespilia: G. garviei has about 40% more plates and tubercles in the interambulacra.
Remark: (02-26) Adkins, 1928 identified small (7.2 mm) temnopleurids in the Taylor Marl and Navarro sequences (specifically the Nacatoch Sand) and said they were of the genus Zeuglopleurus. Zeuglopleurus emmonsi (formerly Echinocyphus emmonsi) are known from S. Carolina. They cannot be this specimen because Zeuglopleurus are imperforate and non-crenulate.
