head
head shape quadrate
head shape quadrate
The head length is approximately equal to the head with. Used in Antkey to separate the major worker of Pheidole teneriffana from that of Pheidole fervens.
head shape rectangular
head shape rectangular
head shape square to rectangular (Pheidole major)
head width across eyes
head width across eyes
Measure of the maximum cephalic width across the eyes. Used in Antkey to separate Tetramorium caespitum_cf from Tetramorium tsushimae.
no small teeth anterior to spines
no small teeth anterior to spines
The head anterior to the posterolateral spines is smooth and not interrupted by a pair of small teeth or blunt angles. Used in Antkey to separate Atta cephalotes from Atta sexdens. This is a variable character, and should be used with caution until its usefulness is confirmed.
small teeth anterior to spines
small teeth anterior to spines
The head has a pair of small teeth or blunt angles anterior to the posterolateral spines. Used in Antkey to separate Atta sexdens from Atta cephalotes. This is a variable character, and should be used with caution until its usefulness is confirmed.
posterolateral corners armed
posterolateral corners armed
The posterolateral corners of the head are armed with distinct posteriorly projecting spines. Used in Antkey to separate Acromyrmex and Atta from all other myrmicine genera.
posterolateral corners unarmed
posterolateral corners unarmed
The posterolateral corners of the head are unarmed and lack distinct posteriorly projecting spines. Used in Antkey to separate all other myrmicine genera from Acromyrmex and Atta.
posterior margin convex
posterior margin convex
The posterior margin of the head is strongly convex and arching strongly towards the eyes. Used in Antkey to separate the minor worker of Pheidole obscurithorax from Pheidole teneriffana (flat margin) and Pheidole fervens (weakly convex).
posterior margin convex
posterior margin convex
The posterior margin of the head is distinctly convex. Used in Antkey to separate Plagiolepis alluaudi and Plagiolepis pygmaea from Plagiolepis exigua.
posterior margin flat
posterior margin flat
The posterior margin of the head flat. Used in Antkey to separate the minor worker of Pheidole teneriffana from Pheidole obscurithorax (strongly convex) and Pheidole fervens (weakly convex).