Abstract
Arrowcryptus n. gen. is described for Thallis jucunda Arrow, 1936 and Arrowcryptus skelleyi, n. sp. The genus is unique among erotylids by having a dilated ovipositor with a sclerotised, hook-like gonostyle with basal setae. Arrowcryptus is placed in the subfamily Xenoscelinae based on the dicondylic meso-metaventral articulation, basal pronotal pits absent, partial externally-closed procoxal cavities, tarsomeres not strongly lobed below, and submesocoxal lines absent. Absence of stridulatory files, presence of prosternal, mesoventral, and abdominal glandular ducts, presence of submetacoxal lines, will distinguish Arrowcryptus from all members of Xenoscelinae.
References
Arrow, G. (1936) Three Genera of Erotylid Coleoptera New to the African Fauna. Novitates Zoologicae, Tring, 39, 253–256.
Leschen, R. A. B. (2003) Erotylidae (Insecta: Coleoptera: Cucujoidea): phylogeny and review. Fauna of New Zealand, 47, 1–103.
Leschen, R.A.B. & Buckley, T. R. (2007) Multistate characters and diet shifts: evolution of Erotylidae (Coleoptera). Systematic Biology, 56, 97–112.
Leschen, R.A.B., Lawrence, J. F. & Slipinski, A. (2005) Classification of basal Cucujoidea (Coleoptera: Polyphaga), cladistic analysis, keys and review of new families. Invertebrate Systematics, 19, 17–73.
Leschen, R.A.B. & Wegrzynowicz, P. (1998) Generic catalogue and taxonomic status of Languriidae (Coleoptera: Cucujoidea). Annales Zoologici, 48, 221–243.
Robertson, J. A., McHugh, J. V. & Whiting, M. F. (2004) A molecular phylogenetic analysis of the pleasing fungus beetles (Coleoptera: Erotylidae): Evolution of colour patterns, gregariousness and mycophagy. Systematic Entomology, 29, 173–187.
Wegrzynowicz, P. (2002) Morphology, phylogeny and classification of the family Erotylidae based on adult characters (Coleoptera: Cucujoidea). Genus, 13, 435–504.