Enicospilus, Stephens, 1835

Broad, Gavin R. & Shaw, Mark R., 2016, The British species of Enicospilus (Hymenoptera: Ichneumonidae: Ophioninae), European Journal of Taxonomy 187, pp. 1-31 : 5-7

Identification key to British and Irish species of Enicospilus

1. Fore wing lacking sclerites in glabrous area of discosubmarginal cell ( Fig. 2A ); large species, wing length c. 20 mm ................................................................................................................................. 2

– Fore wing with at least one discrete sclerite in discosubmarginal cell ( Fig. 2 B–D); smaller species, wing length <15 mm ......................................................................................................................... 3

2. Head posteriorly, in dorsal view, not expanded laterally beyond the eyes; ocelli touching or almost touching eye; antennal socket separated from inner margin of eye by not more than a third socket diameter ( Fig. 3A ) ................................................................ Enicospilus inflexus ( Ratzeburg, 1844)

– Head posteriorly, in dorsal view, expanded so that head is wider than its width at the eyes; ocelli distinctly separated from eye by about 0.2 × diameter of ocellus; antennal socket separated from inner margin of eye by about half socket diameter ( Fig. 3B ) .............................................................. ....................................................................................... Enicospilus undulatus ( Gravenhorst, 1829)

3. Fore wing with distinct, pigmented proximal and central sclerites ( Fig. 2B ) ................................... 4

– Fore wing with distinct, pigmented proximal sclerite: central sclerite may be present but translucent ( Fig. 2 C–D)........................................................................................................................................ 8

4. Pronotum, mesopleuron, mesoscutum and propodeum with dark patches ( Fig. 14A )........................ ...................................................................................... Enicospilus combustus ( Gravenhorst, 1829)

– Mesosoma lacking dark patches, uniformly testaceous..................................................................... 5

5. Metasoma abruptly tipped with black posteriorly, from 5 th or 6 th tergite ( Fig. 14B )........................... ............................................................................................ Enicospilus ramidulus ( Linnaeus, 1758)

– Metasoma not abruptly black-tipped (but may be diffusely infuscate ventrally and apically).......... 6

6. Head with temples rounded, more buccate, and with distinct ocular-ocellar space ( Fig. 4C ); first metasomal tergite in lateral view with better-defined dorsal dip ( Fig. 6C ); male aedeagus apically paler, apex more rounded, protruding more dorsally and not reflexed ventrally ( Fig. 9B )................. ............................................................................................................... Enicospilus myricae sp. nov.

– Head with temples narrowed, straighter, with ocelli adjacent to or only narrowly separated from eyes ( Fig. 4 A–B); first metasomal tergite with shallow dorsal dip ( Fig. 6 A–B); male aedeagus same colour throughout, apex more smoothly curved, not so protruding dorsally, reflexed ventrally ( Fig. 9A ) .. 7

7. Temples very strongly narrowed behind eyes ( Fig. 4A ); scutellum with sides more nearly parallel, heavily punctate and with slight posterior ridge ( Fig. 5A ); antenna with 51–56 flagellar segments, preapical flagellar segments stouter ( Fig. 7B ) .......................... Enicospilus cerebrator Aubert, 1966

– Temples less strongly narrowed posteriorly ( Fig. 4B ); scutellum with sides distinctly converging posteriorly, more sparsely punctate and smoothly curved posteriorly ( Fig. 5B ); antenna with 58–69 flagellar segments, preapical flagellar segments slenderer ( Fig. 7A ) .................................................. ....................................................................................... Enicospilus adustus ( Haller, 1885) stat. rev.

8. Fore wing with small translucent central sclerite and narrow pigmented distal sclerite ( Fig. 2C ); fore wing vein cu-a distinctly proximal to Rs&M ( Fig. 11A )..................................................................... ....................................................................................... Enicospilus merdarius ( Gravenhorst, 1829)

– Fore wing lacking central sclerite and with very faint distal sclerite ( Fig. 2D ); fore wing vein cu-a opposite vein Rs&M ( Fig. 11B )........................................ Enicospilus repentinus ( Holmgren, 1860)

Figures

Fig. 2. Fore wing discosubmarginal cell. A. Enicospilus undulatus (Gravenhorst, 1829). B. E. ramidulus (Linnaeus, 1758). C. E. merdarius (Gravenhorst, 1829). D. E. repentinus (Holmgren, 1860).

Fig. 3. Head, dorsal view. A. Enicospilus inflexus (Ratzeburg, 1844). B. E. undulatus (Gravenhorst, 1829).

Fig. 14. Habitus. A. Enicospilus combustus (Gravenhorst, 1829), ♀, Bath, England, BMNH(E) 962204. B. E. ramidulus (Linnaeus, 1758), ♀, Cornwall, England, BMNH(E) 962207. Scale bars = 10 mm.

Fig. 4. Head, dorsal view. A. Enicospilus cerebrator Aubert, 1966. B. E. adustus (Haller, 1885). C. E. myricae sp. nov.

Fig. 6. First metasomal segment (anterior to left). A. Enicospilus cerebrator Aubert, 1966. B. E. adustus (Haller, 1885). C. E. myricae sp. nov..

Fig. 9. Male aedeagus. A. Enicospilus adustus (Haller, 1885). B. E. myricae sp. nov.

Fig. 5. Scutellum. A. Enicospilus cerebrator Aubert, 1966. B. E. adustus (Haller, 1885). C. E. myricae sp. nov.

Fig. 7. Distal flagellar segments. A. Enicospilus adustus (Haller, 1885). B. E. cerebrator Aubert, 1966.

Fig. 11. Fore wing (distal to left), vein cu-a arrowed. A. Enicospilus merdarius (Gravenhorst, 1829). B. E. repentinus (Holmgren, 1860).