Chirocephalidae

Key to the genera of the Chirocephalidae

1 17 to 19 pairs of thoracopods, abdomen less than one­fourth the length of thorax ..... 2

1’ Eleven pairs of thoracopods, abdomen subequal in length to thorax ........................... 3

2 17 pairs of thoracopods ........................................................................... Polyartemiella

2’ 19 pairs of thoracopods ............................................................................... Polyartemia

3 Male second antennal distal segment without a medial recurved spine; females with brood pouch sub­spherical, or longer than broad......................................................... 4

3’ Male second antennal distal segment with a medial, apically acute, recurved spine; female with two dorsal and two lateral processes on thoracic segment 10; brood pouch expanded laterally, broader than long ......................................................... Artemiopsis

4 Male second antennal proximal segment with one or more anteriobasal appendages; everted portion of penes sub­cylindrical to spiniform .................................................. 5

4’ Male second antennal proximal segment without anteriobasal appendages; everted portion of penes a broad, flattened process with the distal margin crenulate; Palearctic, Ethiopian regions .................................................................................. Branchinectella

5 Males second antennal appendages 0.5 to 2.5 times as long as the proximal second antennal segment........................................................................................................... 6

5' Males second antennal frontal appendages less than 0.5 times the length of the proximal second antennal segment ....................................................................... Linderiella

6 Penes with a terminal spine; male second antennal distal segment not bent medially (may be bent apically), but may be curved medially 65°; brood pouch subspherical to globular.........................................................................................................................7

6' Penes without a terminal spine; male second antennal distal segment bent medially 90° in proximal third; brood pouch longer than broad ............................................ Dexteria

7 Everted portion of penes spiniform, chitinized, recurved, apically acute, with denticles on concave side; Holarctic; ....................................................................... Eubranchipus

7’ Everted portion of penes conical, not chitinized, without denticles; Palearctic.............. .................................................................................................................. Chirocephalus CHIROCEPHALIDAE Daday, 1910 Artemiopsis Sars, 1897