A seam, shaped like an inverted-Y, that begins at the top of the head and branches toward the compound eyes.

A category of biological classification that ranks between the species and subfamily categories. A genus contains a group of closely related species or a single species that is well removed from other species.

The sequence of taxonomic categories ranked by level of inclusiveness. The categories used on this site, starting with the least inclusive, are subspecies, species, genus, subfamily, family, superfamily, and order.

Speciation in which the initial separation of populations is in time rather than space (compare allopatric speciation).

A specimen of opposite sex to the holotype designated as representative of the species.

The two-word scientific name of a species, the first being the genus name and the second being the specific name. For example, Gryllus pennsylvanicus is a binomen.

The area of the head between the frons and the labrum.

The most robust leg segment; the segment just proximal to the tibia.

A wing arising from the mesothorax, the middle thoracic segment. In Orthoptera, including crickets and katydids, the forewings are usually leathery and are often called tegmina (singular, tegmen).

The stage of an insect between successive molts. The first instar is the stage between hatching and the first molt.