Palaeoperissomma Kovalev in Kalugina & Kovalev, 1985

Lukashevich, Elena D. & Blagoderov, Vladimir A., 2020, Review of Mesozoic Perissommatidae (Insecta: Diptera), Zootaxa 4718 (4), pp. 481-496 : 491-493

publication ID

https://doi.org/ 10.11646/zootaxa.4718.4.3

publication LSID

lsid:zoobank.org:pub:32C51811-97BA-40E4-B503-F25F8C4CF98A

DOI

https://doi.org/10.5281/zenodo.5920778

persistent identifier

https://treatment.plazi.org/id/03C75260-FF90-FFAE-FF26-A0A24A60FD49

treatment provided by

Plazi

scientific name

Palaeoperissomma Kovalev in Kalugina & Kovalev, 1985
status

 

Palaeoperissomma Kovalev in Kalugina & Kovalev, 1985 View in CoL

( Figures 7A, B View FIGURE 7 , 8 View FIGURE 8 A–D)

Palaeoperissomma: Kalugina & Kovalev 1985: 115 View in CoL .

Palaeoperissomma Kovalev in Kalugina & Kovalev, 1985 View in CoL : Lukashevich 2011: 32.

Type species. Palaeoperissomma collessi Kovalev in Kalugina & Kovalev, 1985 View in CoL (Kubekovo, Siberia, J 2).

Species included. Besides type species,? Palaeoperissomma demetrii Kovalev, 1990 View in CoL (Turga, Transbaikalia, K 1) and P. ornatum Lukashevich, 2011 View in CoL (Shar Teg, Mongolia, J 3).

Remarks. Two of three known species were described based on the single isolated wings each ( Kalugina & Kovalev 1985; Lukashevich 2011): P. collessi (holotype PIN, No.1255/261) and P. ornatum (holotype PIN, No.4270/2278). An additional specimen of type species (PIN, No.1255/1341) was collected from the same locality (Kubekovo) in 1989 and studied herein ( Fig. 8A, B View FIGURE 8 ). Some characters of living Perissomma are observed in body structures: V-shaped suture of the tipuloid type; thorax with large metanotum; legs slender, rather elongate, without tibial spurs. Probably three ocelli placed close together in a triangle on the dorsum of the head are present too. As in Perissomma , antenna moniliform, rather short and stout, with 11 segments, segments 2 and 3 enlarged (pedicel and first flagellomere), segment 11 very small, all segments with fine setae only. However, all segments are transverse (shorter than broad).

The holotype of? P. demetrii (PIN, No. 1742/667) was re-studied by us ( Figs 7A, B View FIGURE 7 ; 8C, D View FIGURE 8 ). Kovalev (1990) tentatively suggested that it was a male, but re-examination revealed elongated cerci, therefore the specimen is a female. Visible facets are of similar size. In the original description Kovalev noted that the pattern of antenna (11 segments, enlarged pedicel and tiny last flagellomere) and U-shaped suture on mesonotum ( Fig. 7 A,B View FIGURE 7 ) are similar to living Perissomma , however, the robust habitus differs from one of Perissomma and from habitus of Jurassic P. collessi as now became obvious. Due to poor state of wing preservation Kovalev was hesitant in the generic attribution of this species and these doubts remain (see Discussion).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Perissommatidae

Loc

Palaeoperissomma Kovalev in Kalugina & Kovalev, 1985

Lukashevich, Elena D. & Blagoderov, Vladimir A. 2020
2020
Loc

Palaeoperissomma Kovalev in Kalugina & Kovalev, 1985

Lukashevich, E. D. 2011: 32
2011
Loc

Palaeoperissomma:

Kalugina, N. S. & Kovalev, V. G. 1985: 115
1985
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