N A T U R K U N D L I C H E S   I N F O R M A T I O N S S Y S T E M

Electrocrania marionae in litt.

(zoological nomenclature: nomen nudum, not available)

General information:

Type locality: Russia, Kaliningrad, Palmnicken
Type: Holotype : Russia, Kaliningrad, Palmnicken, Baltic amber, ID www.nkis.info MK-Z61278, in coll. Michael Kurz

Synonyms, misspellings, wrong determinations, etc.:
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Habit:

   
piece of amber containing the holotype: Russia, Kaliningrad, Palmnicken, coll. Michael Kurz HOLOTYPE : Russia, Kaliningrad, Palmnicken, coll. Michael Kurz    
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
   

Description of adults: Examined: 1 . Forewing length: 2.35 mm. Head with erect, hair-like scales; eye semiglobular, about 0.25 mm in diameter; head, as well as the whole body, covered with a wax-like emulsion, maxillary and labial palpi therefore not visible; antennae slightly more than 1/2 of forewing length; pedicellus probably swollen (not definitely visible); flagellomeres 25-29 in female, slightly longer than broad, with distinct ascoid sensillae; forewings with golden glance; spur formula of legs 0-0-4; epiphysis present; midtibia short, without spurs, but with two fine bristles at distal end; hindtibia with two pairs of spurs (not clearly visible).

Distribution:

The species is known only from the holotype in Baltic amber of the Kaliningrad area. Following the Palaebiology Database (2020), this amber dates from the Priabonian period (38.0-33.9 Ma): "According to Aleksandrova and Zaporozhets (2008), the higher parts of the Prussian Formation (including the Blaue Erde or Blue Earth) belong to the Charlesdowniea clathrata angulosa dinocyst Zone. Based on its index species, this zone is concurrent to Zone W13 established in the Parisian basin (Châteauneuf and Gruas-Cavagnetto 1978), where it is correlated with nannoplankton zones NP18–NP21 (Powell, 1992) of the Priabonian. In the Paleogene zonation of northwestern Europe, the first occurrence of Thalassiphora fenestrata is designated at the base of the dinocyst Subzone D12b (36.20 +/- 0.1 Ma), which is correlated with zones NP18 (terminal part)–NP20 of the Priabonian (Luterbacher et al., 2004)."

Biology:

     
Computer model of a Baltic amber forest      
Picture from: Kurz Marion
Detailed view
     

The species is a member of the amber wood biocenosis. In a relatively warm period in the Eocene, the amber wood stretched from Scandinavia to the Ural Mountains in a broad belt. In the south, it was bordered by an ocean, which reached far into eastern Europe and Asia. The wood consisted of coniferous trees to some extent, mainly Pinus succinifera and ancestors of the extant genus Pseudolarix, similar plant associations being present also in North America and throughout temperate Asia (all information retrieved from wikipedia 2010). Gymnosperms and Angiosperms have been plentiful developed already in that wood (e.g. Goeppert & Menge 1883). The climate has been assumed to be mild and wet, the wood itself to be marshy.

Anatomy:

     
Venation: Russia, Kaliningrad, Palmnicken, coll. Michael Kurz      
Picture from: Kurz Michael
Detailed view
     

Venation. Forewing: Presence of humeral vein not detectable; Sc and R1 unforked, Sc meeting costa at 0,44, R1 at 0,59 of forewing length; Sc-R not traceable; Rs1+Rs2 on common stem; Rs4 distinctly preapical; M1 from crossvein R-M; M2 and M3 forking beyond midlength of common M-stem; CuA forked at 3/4; CuP distinctly developed; A1+A2 not visible.
Hindwing: Sc and R1 separate, but close together; Rs1+Rs2 on common stem; Rs4 slightly, but distinctly preapical; M1 from crossvein R-M; M2+M3 forking beyond midlength of common M-stem; CuA forked at about 5/6; CuP distinct; A1+A2 not visible.

Diagnosis:

 
Venation of E. marionae : Russia, Kaliningrad, Palmnicken, coll. Michael Kurz Venation of E. immensipalpa : Russia, Kaliningrad, Palmnicken, coll. Michael Kurz Venation of E. michalskii: Baltic region, Baltic amber, Eocene, in coll. Michael Kurz  
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
 

In venation, the species is very close to Electrocrania immensipalpa Kusnezov, 1941, but is distinctly smaller (forewing length 2.35 mm compared with 3.2 mm in E. immensipalpa) and, with similar relative length of the antennae, has only 25-29 flagellomeres compared with 33-34 flagellomeres in E. immensipalpa. From Electrocrania michalskii Kurz, 2015, E. marionae is primarily distinguished by the position of Rs4 in fore- and hindwings, which is distinctly preapical, whereas in E. michalskii Rs4 meets the wing margin exactly apically in both wings.

Worth knowing:

The species is named in honour of my sister Marion Kurz (1965-2017), who was a declared expert in Micropterigidae.

Sources:

Bernstein. In: Wikipedia, Die freie Enzyklopädie. Bearbeitungsstand: 1. Februar 2010, 19:30 UTC. URL: http://de.wikipedia.org/w/index.php?title=Bernstein&oldid=70103709 [visited 4 February 2010, 13:50 UTC].
Goeppert, H. R. & A. Menge 1883. Die Flora des Bernsteins und ihre Beziehungen zur Flora der Tertiärformation und der Gegenwart. 2 Bde., Commissions-Verlag von Wilh. Engelmann in Leipzig. Danzig.
The Paleobiology Database. URL: https://paleobiodb.org/ [online: 2020.01.06].

Publication data:

history:
Kurz Michael: 2020.07.25
Kurz Michael: 2020.07.26
Kurz Michael: 2020.07.30
Kurz Michael: 2020.07.31
not reviewed

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