Eutyphlus spiralis, 2016

Owens, Brittany E. & Carlton, Christopher E., 2016, Revision ofEutyphlusLeConte (Coleoptera: Staphylinidae: Pselaphinae), with Description of a New Species and Phylogenetic Placement within the Tribe Trichonychini, The Coleopterists Bulletin 70 (1), pp. 1-29 : 1-29

KEY TO THE SPECIES OF EUTYPHLUS

Eyes well-developed, convex ( Fig. 1 ); penial plate rounded-oval to minute and strap-like ( Fig. 2 ) (males) ............................................................................ Key A Eyes vestigial, of a few facets or completely absent; ventrite 7 not visible or barely apparent as a slightly concave triangular strap (females) .............................................................. Key B Key A (males)

1. Possessing secondary sexual characters in the form of excavations on abdominal ventrites .................................................................. 2

1′. Lacking secondary sexual characters on abdomen, ventrites smooth and unmodified ........ 3

2. Abdominal modifications comprising excavations on 3 rd ventrite with lamellae and shelf extending over excavation, 4 th ventrite variously excavated, the excavations contiguous with those of 3 rd ( Figs. 20–25 ); aedeagus with single process associated with dorsal paramere ( Fig. 14 ) ....... E. prominens Casey

2′. Abdominal modifications more extensive, with excavations on the 3 rd –5 th ventrites ( Fig. 27 ); aedeagus more complex, possessing additional process on either side associated with dorsal and ventral parameres ( Fig. 15 )........................... E. schmitti Raffray

3. Pronotum lacking median longitudinal sulcus .................................. E. thoracicus O. Park

3′. Pronotum with median longitudinal sulcus ( Fig. 1 , mls).................................................4

4. Elytron with 1 or 2 basal foveae in addition to subhumeral and sutural foveae; lacking any modifications on legs; mesoventrite convex; penial plate minute and strap-like ( Fig. 2 , VII) .......................................... E. similis LeConte

4′. Each elytron with 3 basal foveae in addition to subhumeral and sutural foveae; with varying combination of modifications on the protibia, mesotibia, mesotrochanter, and metatrochanter ( Figs. 19, 26 ); mesoventrite concave at middle; penial plate large and rounded-oval.............. 5

5. Aedeagus with distal end of left paramere expanded with terminal brush of ctenidial spines, right paramere ventral and expanded distally to right ( Fig. 13 )................ E. dybasi O. Park

5′. Aedeagus with distal end of left paramere twisted, bearing row of ctenidial spines along both sides of process, right paramere ventral and expanded distally to left ( Fig. 17 ).......... ................... E. spiralis Owens and Carlton , new species

Key B (females)

1. Eyes larger and more convex (typically>12 facets); elytron with 3 basal foveae in addition to subhumeral and sutural foveae; ventrite 7 broadly triangular and slightly concave; sternite IX broadly triangular, membranous with Y-shaped sclerotized internal process .............................................. E. dybasi O. Park

1′. Eyes poorly developed to absent (typically <12 facets); elytron with 2 basal foveae in addition to subhumeral and sutural foveae; ventrite 7 not broadly triangular; sternite IX consisting of median and right membranous sacs .................................................................2

2. Eyes completely absent, ocular canthus poorly developed; pronotum lacking median longitudinal sulcus ...... E. thoracicus O. Park

2′. Eyes comprised of at least few facets (occasional exceptions may occur in which no facets are present), ocular canthus well-developed; pronotum with median longitudinal sulcus....... 3

3. Basal pronotal sulcus slightly “u-shaped” between basal foveae, pronotum variably crenulate; more southeastern in distribution (mainly south of Pennsylvania) .................... .... E. similis LeConte and E. prominens Casey

3′. Basal pronotal sulcus straight between basal foveae, pronotum smooth or weakly crenulate; more northeastern in distribution (mainly Pennsylvania to New Hampshire)................ ..................................... E. schmitti Raffray

Figures

Figs. 1–2. Eutyphlus similis, male. 1) Dorsal features: vs = vertexal sulcus; vf = vertexal foveae; mls = median longitudinal sulcus; laf = lateral antebasal foveae; bps = basal prosternal sulcus; lbps = longitudinal basal pronotal sulcus; shef = subhumeral elytral foveae; bef = basal elytral foveae; ds = discal stria; blf = basolateral foveae; bs = basal sulcus; mbd = median basal depression; I–V = visible tergite number; 2) Ventral features: gc = gular carina; gf = gular foveae; lpcf = lateral procoxal foveae; pslc = prosternal longitudinal carina; apsf = anteroprosternal foveae; mmsf = median mesosternal foveae; lmsf = lateral mesosternal foveae; lmtf = lateral metasternal foveae; lmcf = lateral mesocoxal foveae; blf = basolateral foveae; bls = basolateral sulcus; I–VII = visible abdominal ventrite number.

Figs. 19–27. Eutyphlus species, male secondary sexual characters. 19) Modified mesotrochanter, mesotibia, and metatrochanter, A) Mesotibial spine on E. dybasi and E. spiralis, B) Mesotrochanteral flange on E. dybasi, C) Metatrochanteral spine on E. dybasi and E. spiralis; 20) E. prominens, ventrites, Type I; 21) E. prominens, ventrites, Type II; 22) E. prominens, ventrites, Type III; 23) E. prominens, ventrites, Type IV; 24) E. prominens, ventrites, Type V; 25) E. prominens, ventrites, Type VI; 26) E. spiralis, protibial spine; 27) E. schmitti, ventrites.

Figs. 13–18. Eutyphlus species, genitalia. 13) E. dybasi; 14) E. prominens; 15) E. schmitti; 16) E. similis;