Temnocidaris (Stereocidaris) reidi Thompson, 2020
Plate: TesRe-10
Series: Lower Cretaceous Group: Washita Formation: Weno
Locale: south of Benbrook County: Tarrant Stage: Albian
Length: 67.5 mm Width: 8.4mm Spine.
Collector: Robert Reid of Fort Worth
Holotype: NPL 94366
Repository: Non-vertebrate Paleo. Lab., Univ. of Texas
HOLOTYPE INFO:
Holotype: NPL 94366.
Locality: South of Benbrook, Tarrant County, Texas.
Stratigraphy: Weno Formation, Washita Group.
SYNONYMY
SYSTEMATIC PALEONTOLOGY – TAXONOMY
Class: Echinoidea Leske, 1778
Subclass: Cidaroidea Smith, 1984
Order: Cidaroida Claus, 1880
Family: Cidaridae Gray, 1825
Subfamily: Stereocidarinae Lambert, 1900
Genus: TEMNOCIDARIS Cotteau, 1863
Subgenus: STEREOCIDARIS Pomel, 1883
Species: Temnocidaris (Stereocidaris) reidi Thompson, 2020
TYPE SPECIES: Cidaris cretosa Mantell, 1822
DIAGNOSIS
Species described from paddle-shaped primary spines. The shaft features parallel rows of tiny outward-facing barbs, and the distal end expands into blade-shaped structures with a chiseled tip.
STRATIGRAPHICAL OCCURRENCE & DISTRIBUTION
Group: Washita
Formations: Weno Formation
Stratigraphic Units: Lower Cretaceous, Albian.
Counties: Tarrant.
Abundance: Rare; two specimens found.
Associated Fauna: Found in association with Holaster nodulosus, Macraster wenoensis, Washitaster bravoensis, and ammonites.
DESCRIPTION
SPINES: Shape: Long; narrow at the base, widening at the top to create a paddle shape. Widest part is at the blade section (82% wider than the base). Ornamentation: Bottom 5/6th of the shaft has parallel rows of small outward-facing barbs. The final 1/6th length is ornamented with blade-shaped structures, which are more pronounced than the parallel rows. Tip: Shaft terminates in a large, pointed, chiseled tip. The tip is composed of two parts: a wedge piece slightly larger than the base, aligned and jointed with a flat piece on top of it. Base: Round and slightly triangular. (Note: Base, milled ring, and neck are missing in the holotype).
SPECIMENS STUDIED & CONDITION: Two specimens studied. Holotype NPL 94366 is a long spine, broken and glued in two places.
ETYMOLOGY
Named after fossil collector Robert R. Reid from Fort Worth, Texas, who found the specimen.
REMARKS & COMPARISONS
Remarks: This species is defined by the unique morphology of its primary spines.
Comparisons:
Plate: TesRe-10
Series: Lower Cretaceous Group: Washita Formation: Weno
Locale: south of Benbrook County: Tarrant Stage: Albian
Length: 67.5 mm Width: 8.4mm Spine.
Collector: Robert Reid of Fort Worth
Holotype: NPL 94366
Repository: Non-vertebrate Paleo. Lab., Univ. of Texas
HOLOTYPE INFO:
Holotype: NPL 94366.
Locality: South of Benbrook, Tarrant County, Texas.
Stratigraphy: Weno Formation, Washita Group.
SYNONYMY
- Temnocidaris (Stereocidaris) reidi Thompson, 2020
SYSTEMATIC PALEONTOLOGY – TAXONOMY
Class: Echinoidea Leske, 1778
Subclass: Cidaroidea Smith, 1984
Order: Cidaroida Claus, 1880
Family: Cidaridae Gray, 1825
Subfamily: Stereocidarinae Lambert, 1900
Genus: TEMNOCIDARIS Cotteau, 1863
Subgenus: STEREOCIDARIS Pomel, 1883
Species: Temnocidaris (Stereocidaris) reidi Thompson, 2020
TYPE SPECIES: Cidaris cretosa Mantell, 1822
DIAGNOSIS
Species described from paddle-shaped primary spines. The shaft features parallel rows of tiny outward-facing barbs, and the distal end expands into blade-shaped structures with a chiseled tip.
STRATIGRAPHICAL OCCURRENCE & DISTRIBUTION
Group: Washita
Formations: Weno Formation
Stratigraphic Units: Lower Cretaceous, Albian.
Counties: Tarrant.
Abundance: Rare; two specimens found.
Associated Fauna: Found in association with Holaster nodulosus, Macraster wenoensis, Washitaster bravoensis, and ammonites.
DESCRIPTION
SPINES: Shape: Long; narrow at the base, widening at the top to create a paddle shape. Widest part is at the blade section (82% wider than the base). Ornamentation: Bottom 5/6th of the shaft has parallel rows of small outward-facing barbs. The final 1/6th length is ornamented with blade-shaped structures, which are more pronounced than the parallel rows. Tip: Shaft terminates in a large, pointed, chiseled tip. The tip is composed of two parts: a wedge piece slightly larger than the base, aligned and jointed with a flat piece on top of it. Base: Round and slightly triangular. (Note: Base, milled ring, and neck are missing in the holotype).
SPECIMENS STUDIED & CONDITION: Two specimens studied. Holotype NPL 94366 is a long spine, broken and glued in two places.
ETYMOLOGY
Named after fossil collector Robert R. Reid from Fort Worth, Texas, who found the specimen.
REMARKS & COMPARISONS
Remarks: This species is defined by the unique morphology of its primary spines.
Comparisons:
- Temnocidaris (Stereocidaris) hudspethensis: The spines of T. (S.) reidi are similar to T. (S.) hudspethensis in having blade-shaped structures near the end and parallel rows of small bumps along the shaft. However, T. (S.) reidi is distinguished by the distinct paddle shape of the end and the more pronounced barbs along the shaft.
