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Towards the diversity of non-biting midges of the tribe Tanytarsini from Eocene Baltic amber (Diptera: Chironomidae)

Marta Zakrzewska, Wiesław Krzemiński, and Wojciech Giłka

Plain Language Abstract

The Chironomidae (non-biting midges) is the largest and most diverse family of aquatic dipterans, also known to be abundant in Eocene ambers. However, it has up till now been insufficiently studied from the fossil record for both the systematics and species diversity. The Tanytarsini, minute midges known for their mass swarming, are a tribe within the Chironomidae and a species-rich group represented by ca. 650 extant species described worldwide and 190 - in Europe. In contrast, the so far published data on Eocene Tanytarsini pertain to 17 species, all described from Baltic amber (~40-45 Ma). Our work, based on tanytarsine inclusions in amber collected by C. and H.W. Hoffeins (entomologists from Hamburg), reveals a relatively high diversity: 12 species of seven genera, including three new species. Rheotanytarsus hoffeinsorum, Tanytarsus crocota and Stempellinella fibra are new Eocene tanytarsines displaying unique characters important for both systematics and understanding phylogenetic relations in the tribe and in the family. An identification key to the adult males of all genera (8) and species (20) of the tribe Tanytarsini recorded in Eocene Baltic amber is also provided.

Resumen en Español

Hacia la diversidad de quironómidos de la tribu Tanytarsini en el ámbar eoceno del Báltico (Diptera: Chironomidae)

Este trabajo es un estudio sistemático de los quironómidos (Chironomidae) de la tribu Tanytarsini que se encuentran en ámbar del Báltico (Golfo de Gdansk, ~ 40-45 Ma) recogidos por C. y H.W. Hoffeins, Hamburgo, Alemania. Dada la rareza de las especies/especímenes de Tanytarsini registrados hasta ahora en ámbar del Eoceno de la región del Báltico, conocida la tribu en este ámbar a partir de 17 especies en ocho géneros, la colección Hoffeins se distingue por su diversidad relativamente alta. Entre los especímenes recolectados de quironómidos, se encontraron 39 machos adultos de Tanytarsini, incluyendo 28 individuos estudiados en detalle. Pertenecen a 12 especies de siete géneros distintos, incluyendo tres nuevas especies. Rheotanytarsus hoffeinsorum sp. nov. es la segunda especie del Eoceno conocida del género. Tanytarsus crocota sp. nov. y Stempellinella fibra sp. nov. muestran conjuntos de caracteres singulares para estos géneros. Se aportan las diagnosis enmendadas de Archistempellina falcifera Giłka et Zakrzewska, 2013 y A. perkovskyi Giłka et Zakrzewska, 2014, hasta ahora conocidas por solo un individuo, y también la variabilidad morfológica de especies seleccionadas del género Tanytarsus van der Wulp de 1874 de edad Eoceno. Como síntesis de nuestro trabajo y como resultado de las comparaciones realizadas con el fin de definir los taxones estudiados, se proporciona una clave para la identificación de todos los géneros de la tribu Tanytarsini (8), y de las especies (20), del Eoceno, proporcionados por el ámbar del Báltico.

Palabras clave: ámbar del Báltico; Chironomidae; Tanytarsini; sistemática; nuevas especies; clave de clasificación

Traducción: Enrique Peñalver (Sociedad Española de Paleontología)

Résumé en Français

Vers la diversité des chironomes de la tribu des Tanytarsini (Diptera : Chironomidae) de l'Éocène de l'ambre de la Baltique

Ce travail est une étude de la systématique des chironomes (Chironomidae) de la tribu des Tanytarsini trouvés dans l'ambre de la Baltique (baie de Gdańsk, ~40-45 Ma) collectés par C. et H.W. Hoffeins, Hambourg, Allemagne. Étant donné la rareté des spécimens et des espèces de Tanytarsini observés jusqu'à présent dans les ambres éocènes de la région de la Baltique (17 espèces connues dans huit genres), la collection Hoffeins se distingue par sa diversité relativement élevée. Parmi les spécimens de chironomidés collectés, 39 adultes mâles de Tanytarsini ont été trouvés, dont 28 individus étudiés en détail. Ils appartiennent à 12 espèces de sept genres, dont trois nouvelles espèces. Rheotanytarsus hoffeinsorum sp. nov. est la seconde espèce éocène connue pour ce genre. Tanytarsus crocota sp. nov. et Stempellinella fibra sp. nov. montrent des combinaisons de caractères uniques dans ces genres. Des diagnoses émendées d'Archistempellina falcifera Giłka et Zakrzewska, 2013, et A. perkovskyi Giłka et Zakrzewska, 2014, espèces connues jusqu'à présent par un seul individu chacune, et la variabilité morphologique chez une sélection d'espèces éocènes du genre Tanytarsus van der Wulp, 1874, sont également présentées. En synthèse de notre travail et des comparaisons effectuées pour définir les taxons étudiés, une clé d'identification de tous les genres (8) et espèces (20) éocènes de Tanytarsini connus dans l'ambre de la Baltique est fournie.

Mots-clés : ambre de la Baltique ; Chironomidae ; Tanytarsini ; systématique ; nouvelle espèce ; clé

Translator: Antoine Souron

Deutsche Zusammenfassung

Neue Erkenntnisse zur Diversität der Schwarzmücken vom Stamm Tanytarsini aus dem eozänen Baltischen Bernstein (Diptera: Chironomidae)

Diese Arbeit präsentiert eine systematische Untersuchung von Schwarzmücken (Chironomidae) des Stammes Tanytarsini, die im Baltischen Bernstein (Golf von Gdańsk, ~40-45 Ma) gefunden wurden und von C. und H.W. Hoffeins aus Hamburg, Deutschland, gesammelt wurden. Angesichts der bisher raren Funde und Arten von Tanytarsini aus den eozänen Bernsteinen des Baltikums – bisher sind 17 Arten in acht Gattungen bekannt - zeichnet sich die Hoffeins-Sammlung durch eine relativ hohe Diversität aus. Unter den gesammelten Chironomiden-Stücken, wurden 39 tanytarsine adulte Männchen gefunden, von denen 28 Individuen im Detail untersucht wurden. Sie gehören zu 12 Arten aus sieben Gattungen mit drei neuen Arten. Rheotanytarsus hoffeinsorum sp. nov. ist die zweite bekannte Art dieser Gattung aus dem Eozän. Tanytarsus crocota sp. nov. und Stempellinella fibra sp. nov. zeigen einen Satz von einzigartigen Merkmalen innerhalb dieser Gattungen. Verbesserte Diagnosen von Archistempellina falcifera Giłka und Zakrzewska, 2013 und A. perkovskyi Giłka and Zakrzewska, 2014, bisher nur bekannt durch einzelne Individuen und morphologische Variabilität von ausgewählten eozänen Arten der Gattung Tanytarsus van der Wulp, 1874, sind ebenfalls präsentiert. Als Synthese unserer Arbeit und der vorgenommenen Vergleiche die untersuchten Taxa zu definieren, wird ein Schlüssel zur Identifizierung aller aus dem Baltischen Bernstein bekannten eozänen tanytarsinen Gattungen (8) und Arten (20) vorgelegt.

Schlüsselwörter: Baltischer Bernstein; Chironomidae; Tanytarsini; Systematik; neue Art; Schlüssel

Translator: Eva Gebauer

Arabic

Translator: Ashraf M.T. Elewa

 

Schlüsselwörter: Baltischer Bernstein; Chironomidae; Tanytarsini; Systematik; neue Art; Schlüssel

 

zakrzewska photoMarta Zakrzewska. Department of Invertebrate Zoology and Parasitology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland. This email address is being protected from spambots. You need JavaScript enabled to view it.

Ph.D. candidate under the supervision of Prof. Wojciech Giłka. Her research is focused on diversity of fossil chironomids of the tribe Tanytarsini from Eocene Baltic amber and their phylogenetic relations with extant fauna.

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krzeminski photoWiesław Krzemiński. Institute of Systematic and Evolution of Animals, Polish Academy of Sciences, Sławkowska 17, 31-016 raków, Poland. This email address is being protected from spambots. You need JavaScript enabled to view it.

Entomologist, palaeontologist working on systematics, evolution and phylogeny of Diptera and Mecoptera, based on extinct and extant species. Author of more than 120 publications; a keen participant of scientific expeditions to Antarctica, Venezuela, Colombia, Peru, Ecuador, Korea, Vietnam, China, Australia, New Zealand, Brazil. Organizer of over seventy exhibitions in several museums, mainly on fossil and living fauna and on nature protection. The founding member of the International Palaeoentomological Society (2001, Kraków); took part in all its following conferences in Pretoria, South Africa (2005), Alava, Spain (2007), Beijing, China (2010), Byblos, Lebanon (2013).

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gilka photoWojciech Giłka. Department of Invertebrate Zoology and Parasitology, University of Gdańsk
Wita Stwosza 59, 80-308 Gdańsk, Poland. This email address is being protected from spambots. You need JavaScript enabled to view it. (corresponding author).

Taxonomy, zoogeography and biology of extant and fossil nematocerans (Diptera Nematocera), non-biting midges (Chironomidae) and the tribe Tanytarsini. Author of more than 60 publications and over 50 species described from different regions. 

 

FIGURE 1. Tanytarsini - inclusions in Baltic amber from the Hoffeins collection (for details see Table 1 and Material examined).

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FIGURE 2. Rheotanytarsus hoffeinsorum sp. nov., adult male, holotype. 1, as syninclusion in amber (at left); 2, habitus.

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FIGURE 3. Rheotanytarsus hoffeinsorum sp. nov., adult male, holotype. Hypopygium and its structures in dorsal (1-3) and ventral aspect (4-6), photographed in reflected light (1, 4, 5) and drawn (2, 3, 6); 3 , superior volsella; 5-6, median volsella (6 magnified ca. 2 times relative to 5 and ca. 5 times relative to 4).

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FIGURE 4. Tanytarsus crocota sp. nov., adult male, holotype. 1, inclusion in amber; 2, habitus; 3-4, wing photographed in transmitted (3) and reflected light (4); 5, spur of fore leg tibia.

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FIGURE 5. Tanytarsus crocota sp. nov., adult male, holotype. Hypopygium and its structures in dorsal (1, 2) and ventral aspect (3, 4), photographed in reflected light (1), transmitted light (3) and drawn (2, 4); 3-4, median volsella (4 magnified ca. 3 times relative to 2 and 3).

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FIGURE 6. Variations of diagnostic structures in males of Tanytarsus protogregarius (1, 2) and T. serafini (3-6). Hypopygium in dorsolateral aspect (1, 3, 5) and its structures magnified ca. 3-4 times (below): anal point (2, 4) and superior volsella (6).

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FIGURE 7. Stempellinella fibra sp. nov., adult male, holotype. 1, inclusion in amber; 2, habitus; 3, antenna (white arrows: borders between well discernible flagellomeres; grey arrow: incomplete fusion); 4, frontal tubercle (black arrow), antennal pedicel and eye.

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FIGURE 8. Stempellinella fibra sp. nov., adult male, holotype. Hypopygium and its structures in dorsal aspect, photographed in reflected light (1, 2), in transmitted light (4) and drawn (3, 5); 4-5, median volsella (5 magnified ca. 2 times relative to 4).

figure8

 

 

Updated key to the identification of genera and species of the tribe Tanytarsini recorded in Eocene Baltic amber

1. Hypopygium with gonostyli straight, posteriorly directed (Figures 2-8) Chironominae 2
  -. Hypopygium with gonostyli bent, medially directed other Chironomidae (not keyed)  
2. Wing vein RM parallel or slightly oblique relative to R and M, anal lobe weak or not developed, squama bare (Figure 4.3, 4.4) Tanytarsini 3
  -. Wing vein RM transverse relative to R and M, anal lobe well developed, squama with fringe of setae other Chironominae (not keyed)  
3. Superior volsella stout, strongly elongated; gonostylus with subapical lobe on median margin (Zakrzewska and Giłka, 2015b, figures 2, 4); median volsella absent Eonandeva 4
  -. Superior volsella and gonostylus never as above, median volsella present   5
4. Gonostylus slender, subapical lobe small; median setae absent; superior volsella cylindrical; inferior volsella with slightly enlarged apical part (Zakrzewska and Giłka, 2015b, figure 2) E. helva  
  -.Gonostylus broad near apex, subapical lobe large; median setae present; superior volsella swollen in apical part; inferior volsella with distinctly enlarged head-like apical part (Zakrzewska and Giłka, 2015b, figure 4) E. latistyla  
5. Dorsomedian extension of eye well developed (Giłka et al., 2013, figures 2, 3, 6, 8; Zakrzewska and Giłka, 2015a, figures 5, 7). Wing vein R4+5 ending distal of M3+4 to wing apex (Figure 4.3, 4.4; Giłka, 2010, plate 2; Giłka, 2011a, figure 2; Giłka et al., 2013, figures 1, 2, 4, 6, 7; Zakrzewska and Giłka, 2013, figure 1; Zakrzewska and Giłka, 2014, figure 1; Zakrzewska and Giłka, 2015a, figures 5, 7)   6
  -. Dorsomedian extension of eye not developed (Figure 7.4; Zakrzewska and Giłka, 2015a, figure 3). Wing vein R4+5 ending opposite or proximal of M3+4 to wing apex (Seredszus and Wichard, 2007, figures 18, 19, plates 5c, d; Zakrzewska and Giłka, 2014, figure 3; Zakrzewska and Giłka, 2015a, figure 3)   18
6. Superior volsella small, boomerang-shaped or cylindrical; median volsella with two slender falciform lamellae (Giłka et al., 2013, figures 1, 2; Zakrzewska and Giłka, 2014, figure 2) Archistempellina 7
  -. Superior volsella well developed, elongated and/or broadened, roundish, bean-shaped or reniform; median volsella never with two slender falciform lamellae (Figures 3, 5; Giłka, 2010, plate 2; Giłka, 2011a, figure 2; Giłka et al., 2013, figures 4, 6, 7; Zakrzewska and Giłka, 2013, figure 2; Zakrzewska and Giłka, 2015a, figures 6, 8)   9
7. Anal tergite with semicircular posterolateral lobes covered with dense setae; superior volsella boomerang-shaped, with triangular tip; stem of median volsella posteromedially directed, tip narrow (Zakrzewska and Giłka, 2014, figure 2) A. perkovskyi  
  -. Anal tergite without semicircular posterolateral lobes covered with dense setae; superior volsella cylindrical, swollen in distal part; stem of median volsella medially directed, tip swollen (Giłka et al., 2013, figures 1, 2)   8
8. Anal point acute, reaching over superior and median volsellae; stem of median volsella longer than its falciform lamellae (Giłka et al., 2013, figure 1) A. bifurca  
  -. Anal point with swollen roundish tip, reaching bases of median and inferior volsellae; stem of median volsella and its falciform lamellae of the same length (Giłka et al., 2013, figure 2) A. falcifera  
9. Eyes hairy; gonostylus with strong spine-like apical bristle (Giłka et al., 2013, figure 4) Corneliola
C. avia
 
  -. Eyes bare; gonostylus with simple apical seta at most (Figures 3, 5; Giłka, 2010, plate 2; Giłka, 2011a, figure 2; Giłka et al., 2013, figures 6, 7; Zakrzewska and Giłka, 2013, figure 2; Zakrzewska and Giłka, 2015a, figures 6, 8)   10
10. Superior volsella round with slightly projecting posterior part or reniform and posteriorly directed (Figure 3, Giłka et al., 2013, figure 6) Rheotanytarsus 11
  -. Superior volsella elongated, posteromedially or medially directed; if posteriorly directed, then with nipple-like extension (Figure 5; Giłka, 2010, plate 2; Giłka et al., 2013, figure 7; Zakrzewska and Giłka, 2013, figure 2; Zakrzewska and Giłka, 2015a, figures 6, 8)   12
11. Anal point tapering to slender tip; superior volsella round; digitus present; stem of median volsella stout and short, simple, with pectinate or leaf-shaped lamellae fused at bases (Giłka et al., 2013, figure 6) Rh. alliciens  
  -. Anal point with swollen tip; superior volsella reniform; digitus not observed; stem of median volsella bone-shaped, with leaf-shaped separated lamellae (Figure 3) Rh. hoffeinsorum  
12. Anal point with horizontally expanded lateral enlargements and small distal section between; posteriorly directed bar present (Zakrzewska and Giłka, 2013, figure 2) Caladomyia
C. szadziewskii
 
  -. Anal point without lateral enlargements, distal section or bar (Figure 5; Giłka, 2010, plate 2; Giłka, 2011a, figure 2; Giłka et al., 2013, figure 7; Zakrzewska and Giłka, 2015a, figures 6, 8) Tanytarsus 13
13. Wing veins R and M very short, nearly half as long as Cu, VRCu 1.70-1.82; stem of median volsella with setiform and slender subuliform lamellae (Giłka, 2010, plate 2) T. serafini  
  -. Wing veins R and M long, VRCu 1.16-1.52. Stem of median volsella with arcuate, spindle-shaped, leaf-shaped (foliate) lamellae (Figure 5; Giłka, 2011a, figure 2; Giłka et al., 2013, figure 7; Zakrzewska and Giłka, 2015a, figures 6, 8)   14
14. Digitus well developed, extending beyond superior volsella (Zakrzewska and Giłka, 2015a, figure 6) T. glaesarius  
  -. Digitus not observed   15
15. Ultimate palpomere with strong stiff apical seta; anal tergite with longitudinal crest-like hump bearing median setae (Giłka, 2011a, figures 1, 2) T. fereci
  -. Ultimate palpomere without stiff apical seta; anal tergite without longitudinal hump, median setae absent (Figure 5; Giłka et al., 2013, figure 7; Zakrzewska and Giłka, 2015a, figure 8)   16
16. Gonostylus straight, with long seta on apex; superior volsella finger-like, distinctly curved at mid length and medially directed; median volsella sickle-shaped with slender arcuate lamellae (Figure 5) T. crocota  
  -. Gonostylus curved at mid length or boomerang-like, with subapical tooth-like process; superior volsella bean-shaped or with nipple-like apical extension, straight, posteromedially or posteriorly directed; median volsella never sickle-shaped, bearing leaf-shaped (foliate) lamellae (Figure 6.1; Giłka et al., 2013, figure 7; Zakrzewska and Giłka, 2015a, figure 8)   17
17. Stem of median volsella bulb-shaped (Giłka et al., 2013, figure 7) T. congregabilis  
  -. Stem of median volsella straight (Zakrzewska and Giłka, 2015a, figure 8) T. protogregarius  
18. Gonostylus distinctly longer than gonocoxite (Seredszus and Wichard, 2007, figure 18) Stempellina
S. exigua
 
  -. Gonostylus shorter than or as long as gonocoxite (Figure 8; Seredszus and Wichard, 2007, figure 19; Zakrzewska and Giłka, 2014, figure 4; Zakrzewska and Giłka, 2015a, figure 4) Stempellinella 19
19. Gonostylus with apical nipple-like process; anal point with spinulae; superior volsella posteriorly directed; inferior volsella with beak-like protrusion (Zakrzewska and Giłka, 2014, figure 4) S. ivanovae  
  -. Gonostylus without apical nipple-like process; anal point without spinulae; superior volsella medially directed; inferior volsella without beak-like protrusion (Figure 8; Seredszus and Wichard, 2007, figure 19; Zakrzewska and Giłka, 2015a, figure 4)   20
20. Antennal flagellum consisting of 10 flagellomeres; median volsella shorter than superior volsella (Seredszus and Wichard, 2007, figure 19) S. bicorna  
  -. Antennal flagellum consisting of 13 flagellomeres, flagellomeres 11-13 or 12-13 fused in part (Figure 7.3; Zakrzewska and Giłka, 2015a, figure 3); median volsella longer than superior volsella (Figure 8.3; Zakrzewska and Giłka, 2015a, figure 4)   21
21. Median volsella (stem with its lamellae) distinctly shorter than gonostylus, bearing wide pectinate and foliate lamellae (Zakrzewska and Giłka, 2015a, figure 4) S. electra  
  -. Median volsella (stem with its lamellae) and gonostylus of similar length, bearing slender foliate lamellae, single lamella with strongly elongated filiform tip (Figure 8) S. fibra  
 

TABLE 1. Species of the tribe Tanytarsini in the Hoffeins collection and inventory numbers of amber pieces with the specimens examined. CCHH=the collection of Christel and Hans Werner Hoffeins, Germany.

Species Specimen Inventory number
Archistempellina falcifera 1 ♂ CCHH 257-1
Archistempellina perkovskyi 1 ♂ CCHH 1754-4
Caladomyia szadziewskii 1 ♂ CCHH 213-3
Corneliola avia 5 ♂♂ CCHH 93-8, CCHH 213-6, CCHH 242-7, CCHH 257-4, CCHH 1754-9
Eonandeva helva 1 ♂ CCHH 1754-1
Eonandeva latistyla 1 ♂ CCHH 1754-10
Rheotanytarsus hoffeinsorum 1 ♂ CCHH 242-6
Stempellinella fibra 1 ♂ CCHH 257-5
Tanytarsus crocota 1 ♂ CCHH 1754-7
Tanytarsus glaesarius 2 ♂♂ CCHH 213-4
Tanytarsus protogregarius 5 ♂♂ CCHH 242-1, CCHH 242-11, CCHH 257-8, CCHH 1754-12
Tanytarsus serafini 8 ♂♂ CCHH 93-7, CCHH 213-9, CCHH 242-2, CCHH 242-3, CCHH 257-9, CCHH 1754-2, CCHH 1754-3, CCHH 1754-8
Tanytarsini indet. 11 ♂♂ CCHH 93-9, CCHH 140-6, CCHH 213-1, CCHH 213-2, CCHH 213-8, CCHH 242-8, CCHH 257-7, CCHH 257-3, CCHH 242-9, CCHH 242-12, CCHH 1754-13A

 

 

TABLE 2. Leg segment lengths (μm) and leg ratios of male Archistempellina falcifera. Measurements of the holotype are in bold (cf. Giłka et al., 2013). p1 -p3 =pair of legs 1-3, fe=femur, ti=tibia, ta1 -ta5 =tarsomeres 1-5, LR=leg ratio.

  fe ti ta1 ta2 ta3 ta4 ta5 LR
p1 - 440-500 895-960 460-480 380-400 290-305 120 (120) 1.92 -2.03
p2 825 610-645 455-460 230 185 125 80 0.71-0.75
p3 780 660- 750 615 - - - - 0.93

TABLE 3. Leg segment lengths (μm) and leg ratios of male Archistempellina perkovskyi. Measurements of the holotype are in bold (cf. Zakrzewska and Giłka, 2014). p1 -p3 =pair of legs 1-3, fe=femur, ti=tibia, ta1 -ta5 =tarsomeres 1-5, LR=leg ratio.

  fe ti ta1 ta2 ta3 ta4 ta5 LR
p1 675 395 795 430 355 270 105 2.01
p2 675- 750 550- 630 380 210 165 105 65 0.69
p3 675 605-730 505-585 305-345 255-275 150-165 70-75 0.80-0.83

TABLE 4. Leg segment lengths (μm) and leg ratios of male Rheotanytarsus hoffeinsorum sp. nov. p1 -p3 =pair of legs 1-3, fe=femur, ti=tibia, ta1 -ta5 =tarsomeres 1-5, LR=leg ratio.

  fe ti ta1 ta2 ta3 ta4 ta5 LR
p1 690 515 - - - - - -
p2 750 625 - - - - - -
p3 765 720 470 275 220 140 100 0.65

TABLE 5. Leg segment lengths (μm) and leg ratios of male Tanytarsus crocota sp. nov. p1 -p3 =pair of legs 1-3, fe=femur, ti=tibia, ta1 -ta5 =tarsomeres 1-5, LR=leg ratio.

  fe ti ta1 ta2 ta3 ta4 ta5 LR
p1 660 595 - - - - - -
p2 690 630 370 210 160 90 65 0.59
p3 645 690 410 245 200 105 75 0.59

TABLE 6. Leg segment lengths (μm) and leg ratios of male Stempellinella fibra sp. nov. p1 -p3 =pair of legs 1-3, fe=femur, ti=tibia, ta1 -ta5 =tarsomeres 1-5, LR=leg ratio.

  fe ti ta1 ta2 ta3 ta4 ta5 LR
p1 470 225 - - - - - -
p2 490 - 260 120 95 70 45 -
p3 - 425 325 180 150 105 55 0.76

TABLE 7. Diversity of Tanytarsini taxa with numbers of specimens examined from different collections of Eocene Baltic amber examined (Giłka, 2010, 2011a; Giłka et al., 2013; Zakrzewska and Giłka, 2013, 2014, 2015a, 2015b). + for taxon present in the collection; - for taxon absent from the collection; CCHH=the collection of Christel and Hans Werner Hoffeins, Germany; MAI=collection of the Museum of Amber Inclusions, University of Gdańsk, Poland; SIZ=collection of the I.I. Schmalhausen Institute of Zoology, National Academy of Sciences of Ukraine, Kiev, Ukraine.

Genus Species CCHH
Gulf of Gdańsk
MAI
Gulf of Gdańsk
SIZ
Rovno region
Archistempellina   + - +
  bifurca - - 1
  falcifera 1 - 1
  perkovskyi 1 - 1
Caladomyia   + - -
  szadziewskii 1 - -
Corneliola   + + +
  avia 5 16 4
Eonandeva   + - -
  helva 1 - -
  latistyla 1 - -
Rheotanytarsus   + - +
  alliciens - - 1
  hoffeinsorum 1 - -
Stempellinella   + + +
  electra - 1 -
  fibra 1 - -
  ivanovae - 1 1
Tanytarsus   + + +
  congregabilis - - 3
  crocota 1 - -
  fereci - 1 -
  glaesarius 2 1 -
  protogregarius 5 3 -
  serafini 8 4 1
Total number
of genera/species
  7/12 3/7 5/8