Abstract
A new genus of the julid tribe Brachyiulini, Enghophyllum gen. nov., is described, comprising two species from Greece. The type-species, E. naxium (Verhoeff, 1901) comb. nov. (ex Megaphyllum Verhoeff, 1894), appears to be rather widespread in the Aegean: it is known from Antiparos Island and Naxos Island (the type locality), both in the Cyclades, as well as East Mavri Islet, Dodecanese Archipelago (new record). The vulva of E. naxium is described for the first time. In addition, E. sifnium gen. et sp. nov. is described based on a single adult male from Sifnos Island, Cyclades. The new genus is distinct from other genera of the Brachyiulini mainly by its peculiar gonopod structure, apparently disjunct and at least mostly apomorphous: (1) promeres broad, shield-like, in situ protruding mostly posteriad, completely covering the opisthomeres and gonopodal sinus; (2) transverse muscles and coxal apodemes of promere fully reduced; (3) opisthomere with three differentiated processes, i.e., lateral, basal posterior and apical posterior; (4) solenomere rather simple, tubular. The evolution and biogeography of the new genus are briefly discussed, both suggesting its profoundly long isolation in the Aegean region from the contribal genera in the adjacent Balkans and Anatolia.
Highlights
The present paper continues our efforts in revising the large julid tribe Brachyiulini (Lazányi et al 2012; Lazányi & Vagalinski 2013; Vagalinski et al 2013), this time being devoted to the description of a new oligotypic genus from several Aegean islands of Greece
Enghophyllum naxium was hitherto treated as a Megaphyllum species (Lazányi et al 2012)
It was placed in the subgenus Diaxylus Attems, 1940 on the basis of having a simple promere, a simple solenomere, a posterior process at right angles to the opisthomere and lacking a bristle-row along the flagellum channel (Attems 1940)
Summary
The present paper continues our efforts in revising the large julid tribe Brachyiulini (Lazányi et al 2012; Lazányi & Vagalinski 2013; Vagalinski et al 2013), this time being devoted to the description of a new oligotypic genus from several Aegean islands of Greece. E. naxium (Verhoeff, 1901), previously referred to as Brachyiulus naxius, Chromatoiulus (Diaxylus) naxius or Megaphyllum naxium, has been found to occur both in the Cyclades and Dodecanese archipelagos, whereas the second congener, E. sifnium gen. Nov., is a new species described below. The gonopod and, to some degree, the European Journal of Taxonomy 70: 1-12 (2013).
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