Clam Shrimps, Spinicaudata

Timms, Brian, 2009, First records of a leptestherid clam shrimp in Australia (Crustacea, Spinicaudata, Leptestheriidae, Eoleptestheria), ZooKeys 18 (18), pp. 1-16 : 12-13

Key to Genera of Clam Shrimps in Australia

1 Carapace flattened and with growth lines (sometimes inconspicuous); telson with caudal furcae....................................................................................... 2

– Carapace spherical and without growth lines; telson without caudal furcae... ....................................................................................................... Lynceus 1

2 Head with pyriforme frontal organ posterior to compound eyes ................. 3

– Head without a pyriforme frontal organ ..................................................... 5

3 Growth lines weakly developed and generally restricted to carapace margin; movable finger of claspers in males with small sucker-like dorsodistal projection; usually <10 mm in length................................................................... 4

– Growth lines expressed and covering entire carapace; movable finger of claspers without sucker-like dorsodistal projection; usually> 10 mm in length........... ............................................................................................... Limnadopsis 2

4 Telson with a spine on its lower distal angle ............................. Eulimnadia 3

– Telson without a spine on its lower distal angle............................. Limnadia

5 Carapace elongated, coloured brown/reddish/yellowish and> 6mm in adults; dorsal margin of telson without large spines similarly sized to caudal furcae .... 6

– Carapace circular, transparent and small (<5mm); dorsal margin of telson with large spines similarly sized to caudal furcae ...................... Cyclestheria 4

6 Rostrum without an apical spine; telson with <25 spines, usually of variable size.............................................................................................................. 7

– Rostrum with an apical spines; telson with>30 subequal spines.. Eoleptestheria 5

7 Male rostrum in lateral view narrow, only with anterior and ventral margin and no obvious posterior margin; colour of mature specimens brown/reddish...... 8

– Male rostrum in lateral view broad and hatchet-like, with posterior margin in addition to an anterior and ventral margins; colour generally yellowish ........ .................................................................................................... Eocyzicus 6

8 Dorsoposterior end of head (occipital crest) with round and short condylus, distinct from the trunk; generally> 8 mm .............................. Caenestheria 7

– Dorsoposterior of head with a pointed condylus, head and trunk dorsally not distinct; generally <6 mm .................................................... Caenestheriella