Planetella riparia Ševčík & Hippa, 2023

Ševčík, Jan, Hippa, Heikki, Burdíková, Nikola, Sopuch, Kryštof, Skuhravá, Marcela & Bruun, Hans Henrik, 2023, Integrative taxonomy of Central European Planetella (Diptera: Cecidomyiidae) indicates high species diversity, intraspecific variation and low host specificity, Acta Entomologica Musei Nationalis Pragae 63 (2), pp. 413-450 : 435-437

publication ID	https://doi.org/ 10.37520/aemnp.2023.026
publication LSID	lsid:zoobank.org:pub:E961B014-4A0D-482B-A005-6D7B58D60B03
persistent identifier	https://treatment.plazi.org/id/03DA5107-FFC4-FFEC-78CC-FB75FB2E3ED7
treatment provided by	Felipe
scientific name	Planetella riparia Ševčík & Hippa
status	sp. nov.

Treatment

Planetella riparia Ševčík & Hippa sp. nov.

( Figs 11A,B,C View Fig , 14G View Fig )

Type material. HOLOTYPE: J, Slovakia, Cerová vrchovina Protected Landscape Area, Hostice, near pond, 25.v.–22.vi.2022, emergence trap over Carex riparia , leg. J. Roháček & J. Ševčík, specimen after DNA extraction, in ethanol,(No. PLA54 ) (coll. NMPC) . PARATYPEs: 1J, the same data but 22.vi.–19.vii.2022, specimen after DNA extraction, in ethanol, No. PLA 54c (coll. SMOC); 1 ♀, the same data as holotype, specimen after DNA extraction, in ethanol (No. PLA 54b) (coll. JSL-UOC); 5 JJ 2 ♀♀, the same data as holotype, in ethanol (coll. JSL-UOC).

DNA sequences. DNA sequences (COI barcode region, 28S, 16S) taken from the female paratype (No. PLA 54b) are deposited in GenBank. Their Accession numbers are provided in Table 1. The COI sequence of this paratype is identical to that of the holotype.

Diagnosis. A mostly orange brown species, with some body parts dark brown. Antenna with 12 binodose, relatively long flagellomeres, plus a short apical segment. Eyes with a thin, membranous eye-bridge. Terminalia with a narrow, rectangular hypoproct, cerci apically rounded, and relatively narrow and long gonostylus.

Etymology. This species is named after its host plant, Carex riparia ; adjective.

Description. Male. Wing length 5.4 mm (holotype). Overall body coloration mostly orange brown to greyish brown, with head, antennae, some parts of thorax, legs, halters, ventral part of abdomen and gonostyli darker.

Head. Eyes with a narrow, membranous eye-bridge, about 1 to 2 ommatidia broad but ommatidia not touching. Antennal flagellum with 12 binodal tricircumfilial, relatively long flagellomeres, and apically with a very short (about one third of previous flagellomere) uninodal flagellomere lacking circumfila. Flagellomere 1 ( Fig. 14G View Fig ) about 4 times as long as broad, of similar shape as the other flagellomeres but less constricted, flagellomere 4 ( Fig. 14G View Fig ) about 4.7 times as long as broad. Maxillary palpus with 3 palpomeres, the basal one (P1) short, P2 about 1.5 times as long as P1, P3 about as twice long as P2.

Thorax mostly light orange brown, with scutum, scutellum and lateral sclerites darker or bicoloured, light brown and dark brown. Scutum produced above the head, with three dark longitudinal stripes. Mediotergite medially brown, its anterior and lateral margins light.

Wing elongated, about 2.7 times as long as broad. Veins C, R 1, R 5 and Cu-stem dark and distinct. R 1 joining C in the middle of wing. R

reaching C beyond wing apex. Rs present. M 4 light and indistinct. CuA with dark stem and bent downwards.

Legs with tarsal claws slightly longer than maximum tarsal diameter, gradually bent.

Abdomen mostly light greyish to orange brown, ventrally darker. Tergites (T2 to T7) with 3 to 4 light oval spots on each side.

Terminalia ( Figs 11A,B,C View Fig ). Gonocoxite broad, about twice as long as broad, mediobasally with a broad, shallow emargination, not a distinct lobe. Gonostylus relatively narrow, slightly curved, three times as long as broad, almost as long as gonocoxite, apically rounded and pointed medially. Cerci rounded, basally fused. Hypoproct slightly longer than cerci, relatively small, subrectangular, apically straight or slightly rounded (depending on view). Aedeagus narrow, subtriangular, as long as gonocoxites, not much longer than hypoproct.

Female (associated with holotype male by COI sequence). Similar to male in most characters. Eyes with a narrow eye-bridge. Flagellomeres less constricted and shorter than in male. Abdomen vividly brownish orange, each tergite with 3 small light oval spots on each side. Abdomen broad, not distinctly pointed. Cercus small, globular, one-segmented.

Biology. This species is associated with Carex riparia , from which it has been reared. The galls remain unknown.

Discussion. This species is characterized by its smaller size, 12 flagellomeres, eyes with a thin eye-bridge, narrow gonostylus and a small, narrow, rectangular, apically straight hypoproct. It is currently known only from the type locality in Slovakia. This species is, however, very similar, or possibly identical, to some of the type specimens of Planetella tuberifica and P. tumorifica , see below (chapter 3). We prefer to give a new name to this species, apparently rare and local, because of small differences in the male terminalia found between our material and the type specimens of both P. tuberifica and P. tumorifica , although these may be caused by the fact that the type specimens have not been cleared and softened. In this group of species, characterized by 12 flagellomeres and narrow eye-bridge, with at least 5 very similar species, differing only in tiny details on the male terminalia, it is advisable to confirm morphological identification with molecular data, which is impossible in older type material.