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Palaecysta virgae subsp. lanceolata
Palaecysta virgae subsp. lanceolata Chen, 2013, p.292, pl.9, figs.100–101,104–105,107–109; text-figs.9, no.26, text-fig.10, no.52.
Chen (2013, p.292)) described this subspecies several pages before he erected the species (Chen, 2013, p.294).
Holotype: Chen, 2013, pl.9, fig.107.
Age: late Tithonian–Berriasian.
Original description (Chen, 2013):
Palaecysta virgae subsp. lanceolata subsp. nov.
lanceolate, English, pointed apex, depicting the shape of the spinous process of the pre- and postcingular process clusters.
Holotype. Plate 9, Figure 107, Slide 1304-07, H12.
Paratypes. Plate 9, Figure 108, Slide 1256-65, O58; Plate 9, Figure 109, Slide 1286-95/3, S42.
Other specimens. Plate 9, Figures 100, 101, 104, 105.
Diagnosis: This subspecies is characterized by long, straight, spinous processes that arise from arcuate base ridges (Figure 9, drawing 26; Figure 10, drawing 52).
Dimensions (based on measurements from 50 specimens):
Holotype – Whole specimen 120 µm; central body 78 µm; process length 30 µm
Range – Whole specimen 95 (115) 125 µm; central body 68 (75) 80 µm; process length 20 (27) 30 µm
Remarks: The overall morphology of this species is similar to Systematophora areolata Klement 1960, but it differs in possessing arcuate process clusters in its pre- and post-cingular paraplates, and in lacking a paracingular ridge (which links each process pair of its paracingular paraplates).
Occurrences in the Ankamotra-1 well. This subspecies occurred in Zones 3, 4, and 5 (Late Tithonian to Berriasian). Palaecysta melakyensis sp. nov. the melaky, in honour of the name of the region where Ankamotra-1 well was drilled.
Chen (2013, p.292)) described this subspecies several pages before he erected the species (Chen, 2013, p.294).
Holotype: Chen, 2013, pl.9, fig.107.
Age: late Tithonian–Berriasian.
Original description (Chen, 2013):
Palaecysta virgae subsp. lanceolata subsp. nov.
lanceolate, English, pointed apex, depicting the shape of the spinous process of the pre- and postcingular process clusters.
Holotype. Plate 9, Figure 107, Slide 1304-07, H12.
Paratypes. Plate 9, Figure 108, Slide 1256-65, O58; Plate 9, Figure 109, Slide 1286-95/3, S42.
Other specimens. Plate 9, Figures 100, 101, 104, 105.
Diagnosis: This subspecies is characterized by long, straight, spinous processes that arise from arcuate base ridges (Figure 9, drawing 26; Figure 10, drawing 52).
Dimensions (based on measurements from 50 specimens):
Holotype – Whole specimen 120 µm; central body 78 µm; process length 30 µm
Range – Whole specimen 95 (115) 125 µm; central body 68 (75) 80 µm; process length 20 (27) 30 µm
Remarks: The overall morphology of this species is similar to Systematophora areolata Klement 1960, but it differs in possessing arcuate process clusters in its pre- and post-cingular paraplates, and in lacking a paracingular ridge (which links each process pair of its paracingular paraplates).
Occurrences in the Ankamotra-1 well. This subspecies occurred in Zones 3, 4, and 5 (Late Tithonian to Berriasian). Palaecysta melakyensis sp. nov. the melaky, in honour of the name of the region where Ankamotra-1 well was drilled.