Cephennium Müller and Kunze

Hopp, Katie & Caterino, Michael, 2009, Seven new species of Cephennium Müller & Kunze (Coleoptera, Staphylinidae, Scydmaeninae, Cephenniini) from California with a key to native North American species, ZooKeys 24 (24), pp. 31-54 : 51

Key to the species of California Cephennium Müller and Kunze

1 Eyes present, reduced ( Fig. 4A , C-D) ......................................................... 2

– Eyes absent................................................................................................. 4

2(1) Mesosternal process straight, not divergent at apex ( Fig. 2B ); frons of males with medial ridge ( Fig. 4B ) .............. C. celsifrons Hopp & Caterino , sp. n.

– Mesosternal process divergent at apex ( Fig. 2A , D-H); frons of males flat, without medial ridge.................................................................................. 3

3(2’) Single ommatidium present on each side of head ( Fig. 4D ); humeral angle of elytron apically pointed ( Fig. 3H ); body elongate, slender............................ ........................................................... C. aridum Hopp & Caterino , sp. n.

– Four ommatidia present on each side of head ( Fig. 4C ); humeral angle of elytron apically rounded ( Fig. 3C ); body robust........................................... ...................................................... C. mariposae Hopp & Caterino , sp. n.

4(1’) Humeral angle of elytron apically pointed ( Fig. 3A , G-H) ......................... 5

– Humeral angle of elytron apically rounded ( Fig. 3 B-F) .............................. 6

5(4) Basal elytral sutural ridge present (Fig. 1G); apex of mesosternal keel crescent-shaped ( Fig. 2G ) ...................... C. urbanum Hopp & Caterino , sp. n.

– Basal elytral sutural ridge absent; apex of mesosternal keel triangulate ( Fig. 2A ) ................................................................ C. anophthalmicum Brendel

6(2’) Scutellum with two setae ( Fig. 3D, F )........................................................ 7

– Scutellum with four setae ( Fig. 3E ) ...... C. canestroi Hopp & Caterino , sp. n.

7(6) Body robust; moderately large, 0.988 –1.121 mm in length; mesosternal keel strongly divergent at apex, apex 2.4× as wide as widest point anteriorly ( Fig. 2D ); scutellar setae long, extending past posterior margin of scutellum ( Fig. 3D )........................................ C. grandarboreum Hopp & Caterino , n.sp.

– Body elongate, slender; very small, 0.646 mm in length; mesosternal keel weakly divergent at apex, apex 2× as wide as widest point anteriorly ( Fig. 2F ); scutellar setae short, not extending past posterior margin of scutellum ( Fig. 3F )....................................................... C. gilberti Hopp & Caterino , n.sp.

Figures

Figure 2. A–H Mesosternal keel SEMs A Cephennium anophthalmicum Brendel B Cephennium celsifrons Hopp & Caterino C Cephennium mariposae Hopp & Caterino D Cephennium grandarboreum Hopp & Caterino E Cephennium canestroi Hopp & Caterino F Cephennium gilberti Hopp & Caterino G Cephennium urbanum Hopp & Caterino H Cephennium aridum Hopp & Caterino.

Figure 3. A–H Base of left elytron A Cephennium anophthalmicum Brendel B Cephennium celsifrons Hopp & Caterino C Cephennium mariposae Hopp & Caterino D Cephennium grandarboreum Hopp & Caterino E Cephennium canestroi Hopp & Caterino F Cephennium gilberti Hopp & Caterino G Cephennium urbanum Hopp & Caterino H Cephennium aridum Hopp & Caterino.

Figure 4. A–D Characters on the head, including number of ommatidia and male frons A–B Cephennium celsifrons Hopp & Caterino C Cephennium mariposae Hopp & Caterino D Cephennium aridum Hopp & Caterino.