Megastilicus iowaensis, Żyła & Koszela, 2021

Żyła, Dagmara & Koszela, Katarzyna, 2021, Redescription of the genus Megastilicus Casey (Staphylinidae, Paederinae) with the description of a new species, European Journal of Taxonomy 778, pp. 138-147 : 143-145

Megastilicus iowaensis sp. nov.

urn:lsid:zoobank.org:act:9603D57D-FAA2-4DAD-B68F-C91647D98CD0

Fig. 2

Diagnosis

Head as long as wide.Antennomere 4 more transverse compared to elongated in Megastilicus formicarius . Teeth on labrum pointed. Eyes larger than in M. formicarius , ca ⅕ of head length. Median emargination of posterior margin of sternum VIII shallower and narrower than in M. formicarius .

Etymology

The species name ʻ iowaensis ʼ is derived from the name of the US state Iowa where this species has been collected.

Type material

Holotype USA • ♂ with ant [identified as Formica subsericea ]; “ Iowa City Wickham IV 10? / WICKHAM Collection 1933”; NMNH.

Paratypes USA • 1 ♀; “ Iowa City Iowa IV 10 Wickham / WICKHAM Collection 1933”; NMNH • 1 ♀ with ant; “ Iowa City Wickham IV-13 -?8 / WICKHAM Collection 1933”; NMNH • 1 ♀ with ant; “ Iowa City Wickham IV-29-68? / Megastilicus formicarius Csy. / Host ant: Formica subsericea / 9650 / Percy Gardner Bolster Coll’n / M. formicarius Casey 9650 / MCZ ENT 00744565 ”; MCZ .

Description

BODY. Colour of specimens pale brown/sandy ( Fig. 2A–B ). Head darker. Body length from tip of head to tip of abdomen 6.0.

HEAD. Width 1.0, length 1.1–1.2. Antennomere 1 elongate, widest at tip; antennomeres 2 and 3 elongate; antennomeres 4 to 10 gradually becoming strongly transverse; antennomere 11 elongate, 1.5 × as long as antennomere 10. Antennomeres 1 and 2 sparsely pubescent, antennomeres 3 and 4 more densely pubescent, antennomeres 5 to 11 densely covered with tomentose pubescence. Emargination on anterior margin of labrum shallow. Maxillary palpomere 2 slender and short, with only few setae, maxillary palpomere 3 slightly expanded towards apex with denser setation, maxillary palpomere 4 glossy. Eyes about ⅕ of head length, shifted anteriorly, ⅓ of temple length.

THORAX. Pronotum width 0.9, length 1.0–1.1. Elytra width 1.4–1.5, length 1.3–1.4.

LEGS. Two long setae on outer margin of metacoxa. Seta closer to abdomen shorter and thinner than seta more distant from abdomen.

ABDOMEN. Tergum VIII with slightly pointed posterior margin. Male with sternum VIII with shallow and broad median emargination of posterior margin; depth of emargination of ca ⅐ of sternum length; sides of emargination rounded ( Fig. 2C ); surface anterior to emargination without setae, while margins with dense setation.

AEDEAGUS. With ventral process in parameral view widened in middle; lateral plates of internal sac welldeveloped and attached to sides of median lobe ( Fig. 2D–E ).

Occurrence

The new species has so far only been recorded from Iowa State.

Figures

Fig. 2. Morphology of Megastilicus iowaensis sp. nov. A. Dorsal habitus of holotype (NMNH). B. Dorsal habitus of paratype (NMNH). C. Sternum VIII. D. Aedeagus in parameral view. E. Aedeagus in lateral view. Scale bars = 1 mm.