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Ceratiopsis navarriana
Ceratiopsis navarriana, Srivastava, 1995, p.274, pl.7, figs.1–3.
NOW Cerodinium. Originally Ceratiopsis (generic name illegitimate), subsequently (and now) Cerodinium. Following I.C.N. Article 55.1, the species name Ceratiopsis navarriana is validly published even though the generic name Ceratiopsis is illegitimate.
Holotype: Srivastava, 1995, pl.7, fig.2.
Age: Maastrichtian.
Original description Srivastava, 1995
Description-Cysts compressed peridinioid, pentagonal to roundly pentagonal with a single long apical and two equal divergent tapering antapical horns, sides straight to slightly convex; cornucavate, rarely slightly bicavate, endocyst pentagonal to roundly pentagonal filling the main body; periphragm smooth with a few wrinkles aligned longitudinally, sometimes anastomosing in certain areas; endophragm smooth; paratabulation indicated by an archeopyle and a low irregular paracingulum; archeopyle intercalary, 2a type, operculum free; paracingulum low transverse parallel ridges, ridges sometimes granular.
Size measurements--Total length x breadth range 104-169 x 49-99 ~m in eight specimens.
Holotype--Pl. 7, fig. 2; photomicrograph reference no. 85029/11; objective x 40; microscope locationhorizontal 19.0/ vertical 113.0; size-total length x breadth 122 x 73 ~m, endocyst 70 x 70 ~m; sample no. CRC 32140-1/slide 1; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Paratype--PI. 7, figs 1, 3; photomicrograph reference no. 85030/34; objective x 40; microscope location horizontal 18.0/ vertical 102.0; size-total length x breadth 133 x 81 ~m, sample no. CRC 32140-1/Slide 7; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Paratype--Pl. 7, fig. 3; photomicrograph reference no. 85030/6; objective x 40; microscope location horizontal 20.5/vertical 113.0; size-total length x breadth 169 x 99 ~m; sample no. CRC 32140-1/Slide 4; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Remarks-C navarriana is distinct from C albertii (Corradini), C striata (Drugg), and C subquadra (Corradini) in being cornucavate; from C cordifera (May) and C leptoderma Vozzhennikova in having pentagonal endocyst; from C crassisthata (Jain et at.) and C granulostriata (Jain & Millepied) in having smooth endocyst and from C pannucea (Stanley) in lacking well-developed paracingulum.
Name derivation-After Navarro Group from Navarro County, Texas.
NOW Cerodinium. Originally Ceratiopsis (generic name illegitimate), subsequently (and now) Cerodinium. Following I.C.N. Article 55.1, the species name Ceratiopsis navarriana is validly published even though the generic name Ceratiopsis is illegitimate.
Holotype: Srivastava, 1995, pl.7, fig.2.
Age: Maastrichtian.
Original description Srivastava, 1995
Description-Cysts compressed peridinioid, pentagonal to roundly pentagonal with a single long apical and two equal divergent tapering antapical horns, sides straight to slightly convex; cornucavate, rarely slightly bicavate, endocyst pentagonal to roundly pentagonal filling the main body; periphragm smooth with a few wrinkles aligned longitudinally, sometimes anastomosing in certain areas; endophragm smooth; paratabulation indicated by an archeopyle and a low irregular paracingulum; archeopyle intercalary, 2a type, operculum free; paracingulum low transverse parallel ridges, ridges sometimes granular.
Size measurements--Total length x breadth range 104-169 x 49-99 ~m in eight specimens.
Holotype--Pl. 7, fig. 2; photomicrograph reference no. 85029/11; objective x 40; microscope locationhorizontal 19.0/ vertical 113.0; size-total length x breadth 122 x 73 ~m, endocyst 70 x 70 ~m; sample no. CRC 32140-1/slide 1; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Paratype--PI. 7, figs 1, 3; photomicrograph reference no. 85030/34; objective x 40; microscope location horizontal 18.0/ vertical 102.0; size-total length x breadth 133 x 81 ~m, sample no. CRC 32140-1/Slide 7; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Paratype--Pl. 7, fig. 3; photomicrograph reference no. 85030/6; objective x 40; microscope location horizontal 20.5/vertical 113.0; size-total length x breadth 169 x 99 ~m; sample no. CRC 32140-1/Slide 4; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Remarks-C navarriana is distinct from C albertii (Corradini), C striata (Drugg), and C subquadra (Corradini) in being cornucavate; from C cordifera (May) and C leptoderma Vozzhennikova in having pentagonal endocyst; from C crassisthata (Jain et at.) and C granulostriata (Jain & Millepied) in having smooth endocyst and from C pannucea (Stanley) in lacking well-developed paracingulum.
Name derivation-After Navarro Group from Navarro County, Texas.