Dakotaeschnidium spedeni NEL 2021, sp. nov.
Bibliographic record
Abstract
Dakotaeschnidium spedeni sp. nov. (Fig. 1) urn:lsid:zoobank.org:pub: C625EE39-050C-49CC-9182- 220F212BCFB4 Material. HolotypeYPM IP 028154 (collector Ian G. Speden, 1962, IP number 28154; lot count 1; part/counterpart). Invertebrate Paleontology, Yale Peabody Museum, New Haven, USA. Etymology. Named after Ian G. Speden who collected the type specimen. Diagnosis. As for the genus. Wing membrane darkened. Description. A fragment of hind wing showing the discoidal triangle, hypertriangle, a fragment of the postdiscoidal area, the submedian space and basal part of anal area, 11.7 mm long, 21.0 mm wide; whole membrane very dark with yellow veins; part of wing basal to hypertriangle missing; hypertriangle subdivided into ca. 40 small irregular cells, 1.9 mm wide, 11.6 mm long; discoidal triangle clearly transverse, subdivided into more than 27 irregular cells, with vein MAb more than 7.0 mm long, curved, vein separating discoidal triangle from hypertriangle 3.1 mm long, and vein MP+CuA 6.6 mm long; postdiscoidal area very broad at base, with more than 13 rows of cells between MAa and MP; anal area very broad, 16.2 mm wide; only three posterior branches of AA in anal area; no infrasubdiscoidal space basal to basal subdiscoidal space; basal subdiscoidal space transverse, posteriorly opened because vein AA1a poorly defined, distal subdiscoidal space transverse, with a shape of acute triangle, very broad and long, subdivided into ca. 70 irregular cells, no angle between AAspl and AA1a veins; PsA vein clearly visible vanishing one cell basal to antero-basal angle of discoidal triangle; submedian space subdivided into more than 11 irregular cells; area between RP and MA subdivided into numerous cells disposed in three rows. Type locality and horizon. Fox Hills Formation, Trail City Member. USA; South Dakota; Dewey County; float, conc. 5, face on SW side of SSE-trending spur, 1.25 miles W of E end of Long’s Ridge, Long’s Ridge, and 6 miles W of Whitehorse. Maastrichtian, Late Cretaceous. Remarks. The very broad anal of this fossil is typical of that of a hind wing of an Aeschnidiidae, with a basal subdiscoidal space and a distal subdiscoidal space. The transverse discoidal triangle is also only found in this family (Fleck & Nel, 2003). The particular shape of the distal subdiscoidal space of YPM IP 028154 is also found in Gigantoaeschnidium ibericus Nel & Martinez-Delclòs, 1993, but the basal subdiscoidal space of Gigantoaeschnidium is much smaller than that of YPM IP 028154, and it has an angle between AAspl and AA1a veins (Fleck & Nel, 1993: fig. 63a). Angloaeschnidium toyei Fleck & Nel, 1993 and Cooperaeschnidium durandi Fleck & Nel, 1993 have their distal subdiscoidal spaces similar to those of YPM IP 028154 but their distal subdiscoidal spaces are much smaller than that of YPM IP 028154. They also have only one row of cells in their hypertriangles. Even if Santanoptera gabbotti Martill & Nel, 1996 (Aptian, Crato Formation, Brazil) is based on a forewing, its distal subdiscoidal space is similar to that of YPM IP 028154, and it has no angle between AAspl and AA1a veins (Fleck & Nel, 1993: fig. 89). They also share the presence of two rows of cells in the hypertriangle, two in the submedian space, and two-three in the basal part of area between RP and MA. Nevertheless, Santanoptera has a smaller basal subdiscoidal space that is posteriorly closed by a well-defined vein AA1a. Despite the fact that the specimen YPM IP 028154 is reduced to the basal third of a hind wing, it has a series of characters allowing to consider that it corresponds to a new genus and species, possibly related to the South American genus Santanoptera, as they share the very particular absence of an angle between AAspl and AA1a veins, and presence of several rows of cells in hypertriangle, submedian space, etc.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.000 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.004 | 0.001 |
| Scholarly communication | 0.001 | 0.003 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.023 | 0.019 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".