Agnathia, Staples, 2021

Staples, D. A., 2021, Diagnosis ofthe new genusAgnathia (Pycnogonida, Callipallenidae) and description of two new species from southern Australia, Zootaxa 4950 (3), pp. 487-500 : 489

Key to callipallenid genera without palps in both sexes and oviger claw is *present *(e xcepting six - segmented ovigers in male Agnathia and Cheilopallene).

1. Sclerotized jaws absent, lips hirsute, reflexing.............................................................. 2

- Sclerotized jaws present, proboscis mostly glabrous, rarely finely ciliated......................................... 3

2. Prominent lobes on cephalon, leg surface conspicuously irregular and spinous, male oviger 6-segmented without terminal claw, or 10-segmented both sexes with terminal claw present........................................ Agnathia gen. nov.

- Cephalon without prominent lobes, legs mostly linear, spines sparse, oviger 10-segmented both sexes, terminal claw present.................................................................................... Labrumoides Staples

3. Chela fingers both digitiform............................................................................ 4

- Chela fixed finger truncated, nodulose..................................................... Cheilopallene Stock

4. Chela fingers with smooth cutting edges, at most with single node or tooth........................................ 5

- Chela fingers cutting edges serrated or denticulate.......................................... Seguapallene Pushkin

5. Neck region of cephalon short, defined or ill-defined throughout length.......................................... 6

- Neck of cephalon well-defined, usually long, slender......................................................... 7

6. Trunk smooth, ovoid, neck broad, ill-defined, lateral processes in contact, 8 eyes, proboscis and chelifores held in line with trunk, chelae axial, fixed finger rounded in cross-section, without sclerotized cutting edge.............. Stylopallene Clark

- Trunk smooth, hunched, moderately elongate, neck short, defined, lateral processes narrowly separated, 4 eyes, proboscis and chelifores angled downwards or under trunk, scapes angled outwards, chela directed inwards, fixed finger with heavily sclerotized cutting edge................................................................. Pallenella Schimkewitsch

7. Proboscis distally trilobate, truncate, jaws slightly projecting, glabrous, neck long or intermediate... Parapallene Carpenter

- Proboscis rounded at tip or mammilliform, finely ciliated, neck long............................... Cordylochele Sars

Note: Females in Neopallene and Oropallene lack palps and based on this character alone, could be confused other genera in this key. However, both these genera include species with auxiliary claws and denticulate or serrated chelae fingers, characters only found in two genera in this key; Seguapallene and some misplaced species of Parapallene . Until these genera are revised, care should be exercised when assigning solitary females.