Stempellinella sp. B
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publication ID |
https://doi.org/ 10.1080/00222930701437360 |
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persistent identifier |
https://treatment.plazi.org/id/CD7F7062-6B55-FFD9-FFDB-019C806FFCFE |
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treatment provided by |
Felipe |
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scientific name |
Stempellinella sp. B |
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Material examined
China: 1 Pex ( ZSM), Jilin Province, Dongbei , river at road half way between Songjiang and Erdobaihe, 12 June 1980, E. J. Fittkau . USA, MN ( UMSP): 1 Pex, Dakota Co., Chub Crk., upstream Eveleth Ave., N of Northfield, 44.5216 ° N, 93.1811 ° W, 3 July 2003, R. W. Bouchard Jr.; 3 Pex, Scott Co. , City of Savage , City Park, Hidden Valley , Credit River , 44.7608 ° N, 93.3424 ° W, 25 July 2004, 8 September 2004, 22 September 2004, R. W. Bouchard Jr.; 1 Pex, Chisago Co. Sunrise River , 45.5584 ° N, 92.8575 ° W, 16 October 2003, L. C. Ferrington Jr .
Diagnostic characters
Stempellinella sp. B can be separated from other Stempellinella species by the following combination of characters: pupa with well-developed, long, tubular cephalic tubercles; thoracic horn comparatively short and thick with numerous small chaetae scattered on middle one-third; thorax with extensive granulation in apical half; coarse sculpturing on thorax, frontal apotome, and on pedicel sheaths; median antepronotal on obvious tubercle; anterior dorsocentrals slightly longer than posterior dorsocentrals; point patches on tergite II small, starting just anterior to seta D5; points on tergites three to six posterolaterally directed; anal lobe with 15–23 taeniae.
Description
Pupa (n 5 5, unless otherwise stated). Total length 2.0–2.4, 2.1 mm; abdomen 1.5–1.8, 1.6 mm long. Colour of pupal exuviae pale brown with darker lateral margins on abdominal segments VII – VIII and anal lobe.
Cephalothorax ( Figure 32A, B View Figure 32 ): cephalic tubercle well developed, tubular, 45–63, 53 Mm long; frontal setae taeniate, 90–150, 108 Mm long; pedicel sheath tubercle absent; coarse sculpturing on frontal apotome and pedicel sheaths. Thoracic horn 250–300, 276 Mm long, 35–45, 40 Mm wide with 3–5 Mm long chaetae scattered on middle one-third; precorneals taeniate, arranged in slight triangle on obvious mound, ca 120–200 Mm long, anterior setae placed closer to each other; median antepronotal taeniate 150–240, 195 Mm long, two lateral antepronotals: one taeniate ca 105 Mm long, one long sensillum basiconicum; two pairs of fine dorsocentrals, anterior pair 45–70, 54 Mm long, posterior pair 25–35, 30 Mm long. Extensive granulation in anterior half of thorax, a few stronger granules present along median suture line, coarse sculpturing below anterior dorsocentrals. Prealar tubercle well developed, wide; nose of wing sheath well developed.
Abdomen ( Figure 32C View Figure 32 ): TII with small triangular posteriomedian point patches which start slightly anteriorly to seta D5; hook row 105–125, 117 Mm wide with 42–59, 49 hooks. TIII – V with small point patches in which at least posterior points are posterolaterally directed; TVI with four point patches, points posterolaterally directed; TVI –IX with anterolateral patches of shagreen. Segment II with pedes spurii B; segment IV with pedes spurii A. Segment II with 2 D, 2 V, 3 L setae; segment III with 3 D, 2 V, 1 simple and 2 taeniate L setae; segment IV with 3 D, 3 V, 1 simple and 2 taeniate L setae; segment V with 2–3 D, 3 V, 3 taeniate L setae; segment VI – VII with 2 D, 3 V, 4 taeniate L setae, segment VIII with 1 D, 1 semi-taeniate V, 3 taeniate L setae; segment IX with 1 D seta on anal lobe, 15–23, 19 taeniate setae in anal fringe. One pair of O-setae present anteriorly on tergites II – VII and anterolaterally on sternites II – VIII. Pleurae IV – VII with small fields of weak shagreen. Posterolateral spur on segment VIII well developed.
Remarks
Stempellinella sp. B is recorded only from Jilin Province in China and Minnesota in the USA. The only observable difference between the material from these two widely separate localities is that the Chinese specimen is slightly larger and somewhat less sculptured on the thorax and frontal apotome. These small differences are here regarded as intraspecific. A formal name is not given since only pupal skins are known, and it is uncertain if these correspond to a Stempellinella species known only from the adult.
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