Subfamily ILYARACHNINAE Hansen, 1916

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Subfamily ILYARACHNINAE Hansen, 1916

Ilyarachnini Hansen, H.J. 1916. Crustacea Malacostraca III: The Order Isopoda. Danish Ingolf-Expedition 3(5): 1-262, pls 1-16 [120] [original spelling].

Introduction

Ilyarachines are recognised by the bases of pereopods 3, 4 being much shorter than that of pereopod 2 short, thick mandibles with a blunt incisor and reduced molar process, and a head usually wider than anterior pereonites. In a series of papers Merrin addressed the taxonomy of Ilyarachninae (see e.g., Merrin, 2004, 2009, 2011, 2016, 2024).

Diagnosis

Body elongate, articulating, anterior margins smooth or with robust setae, without lateral spines; head usually wider than anterior pereonites; rostrum absent. Pereonites 5–7 with complete dorsal articulation; pleotelson oval-elongate. Antennulae inserted close together on frons; article 1 laminar. Antenna much longer than body. Mandible short, thick, with blunt incisor, with reduced molar process. Pereopods 3, 4 bases much shorter than bases of prehensile pereopods 1, 2; pereopods 5–7 natatory, propodi narrower than carpi; dactyli strong, long, more than half as long as propodi, with apical setae and 1 or 2 claws. Uropod ventral; uniramous or if biramous exopod minute.