Phytomyza triostevena Eiseman & Lonsdale 2021, spec. nov.
Bibliographic record
Abstract
Phytomyza triostevena Eiseman & Lonsdale, spec. nov. (Figs. 53–56, 86, 154–158) Holotype. USA. IOWA: Allamakee Co., 5.ix.2017, puparium removed from midrib 26.ix.2017, adult em. by spring 2018, J. van der Linden, ex Triosteum, # CSE4663, CNC1144064 (1♁). Etymology. The specific epithet is a noun in apposition, a portmanteau referring to the position of the larval mines in the veins and midribs of leaves of Triosteum L. (L. vena —a vein). Host. Caprifoliaceae: Triosteum L.; similar leaf mines have been found on T. aurantiacum E.P.Bicknell (Mews 2019a). Leaf mine. (Fig. 86) The larva initially forms a narrow, serpentine mine in the leaf blade. It soon enters a lateral vein and follows this to the midrib, in which it feeds until mature. Puparium. (Fig. 56) Brown; formed within the midrib, near the base of the leaf. Phenology and voltinism. Leaf mines have been observed beginning in early September, with adults probably not emerging until the following spring. Distribution. USA: IA; similar leaf mines have been found in Canada: ON (Mews 2019a). Adult description. Wing length 1.8 mm (♁). Female unknown. Vein dm-m absent. Eye height divided by gena height: 3.5. First flagellomere rounded, as long as high. Orbital plate well-defined, pruinose, narrowing anteriorly. Frontal vitta minutely pitted, appearing darker. Cheek well-developed. Thorax subshining. Chaetotaxy: Two ori (anterior seta slightly shorter and positioned closer to eye margin); one ors. Ocellar seta subequal to anterior ori; postvertical subequal to ors. Four dorsocentral setae, decreasing in length anteriorly, with anterior two much shorter (less than half length of first seta). Approximately four to five irregular rows of acrostichal setulae. Coloration: (Figs. 53–55) Setae dark brown. Body dark brown to black; with thick greyish pruinosity on thorax that is more distinct on scutum; gena, parafacial and lunule brown; inner margin of orbital plate beige; halter whitish-yellow. Calypter yellow, hairs light brown. Genitalia: (Figs. 154–158) Surstylus small, rounded, fused to venter of epandrium, curved posteriorly with dense apical cluster of short setae. Cercus small. Hypandrium broadly rounded; inner lobe V-shaped with two medial setae. Postgonite simple and narrow with one seta. Phallophorus cylindrical with anterodorsal margin lengthened to reach base of basiphallus; lateral lobe simple, narrow. Basiphallus consisting of one pair of long, narrow plates with irregular margins and narrower apices; right plate with base positioned dorsally, left plate with base wrapping around venter. Hypophallus (one pair of lateral sclerites) small, irregular-ovate in outline. Mesophallus not evident. Paraphallus very small, with irregular subovate outline. Distiphallus sharply angled dorsally, thick with apex narrower and slightly curved; seen “ventrally”, outline X-shaped with short arms and long middle section, with apical arms shorter, irregular and less well-defined, each ending in its own small membranous lobe. Ejaculatory apodeme not found. Comments. This is the second agromyzid to be reared from Triosteum, after Aulagromyza orbitalis. Also in Iowa, we have found mines representing two other Phytomyza species, presumably likewise in the periclymeni superspecies. One is an entirely linear mine in the leaf blade, with frass in closely spaced grains and with a brown puparium formed at the end; the other is digitate and centered on the midrib, similar to those of P. chamaemetabola (Griffiths) and P. gregaria Frick on Lonicera involucrata (Richardson) Banks ex Spreng. (Griffiths 1974). Phytomyza triostevena is a modestly sized and almost entirely dark species with one ors and pale greyish-blue pruinosity on the thorax. Among the Caprifoliaceae mining Phytomyza, it can be differentiated by having numerous rows of acrostichal setulae, and a small pair of lateral sclerites on the hypophallus that are irregularly ovate in outline and positioned distal to the end of the basiphallus; this combination of characters will key it approximately to P. nigrilineata (Griffiths) in Griffiths (1974). The small, upturned distiphallus must be examined for confident diagnosis; in lateral view, it is relatively stout with the apex narrowed and curved, and in ventral view, is more than twice as long as wide with shallow bifurcations at either end, appearing somewhat X-shaped; the distal points are shallower, somewhat ill-defined and annulated.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.019 | 0.013 |
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".