Parapinnanema

Semprucci, Federica & Sørensen, Martin V., 2014, A new species of Parapinnanema (Nematoda, Chromadoridae) from Dr Theodor Mortensen’s Pacific Expedition 1914 – 16 with an identification key to the genus, Zootaxa 3881 (6), pp. 501-512 : 511

Key to the adult males of the genus Parapinnanema

A previous key to the genus was proposed by Warwick & Coles (1975). An updated and modified key to the species is provided below.

1. Buccal cavity with a series of comb-like teeth.............................................................. 2

- Buccal cavity without comb-like teeth..................................................................... 3

2. Male body length> 3000 µm.................................................................. P. imbricatum

- Male body length <3000 µm.................................................................. P. pectinatum

3. L-shaped pieces of gubernaculum with proximal and distal limbs about equal length (ratio <2)........................4

- L-shaped pieces of gubernaculum with lengths of the proximal limbs> distal ones (ratio> 2)........................10

4. Male body length <1450 µm.................................................................. P. mexicanum

- Male body length> 1450 µm............................................................................ 5

5. Sharp flexure of the L-shaped pieces at more than right angle................................................... 6

- Sharp flexure of the L-shaped pieces at ~ right angle.......................................................... 7

6. Spicules with a protuberance at the ventral side of the proximal part and capitulum clearly ventrally curved....... P. bableti

- Spicules without a protuberance at the ventral side of the proximal part and capitulum.......................... P. ritae

7. Median piece laterally expanded up to the L-shaped piece.......................................... P. hawaiiensis

- Median piece without lateral expansions...................................................................8

8. Double-jointed spicules present................................................................ P. rhipsoides

- Double-jointed spicules absent........................................................................... 9

9. L-shaped pieces of gubernaculum notched distally....................................................... P. alii

- L-shaped pieces of gubernaculum not notched......................................................... P. colesi

10. Sharp flexure of the L-shaped pieces at a> right angle................................................ P. shirleyae

- Sharp flexure of the L-shaped pieces at ~ right angle......................................................... 11

11. L-shaped pieces of gubernaculum with proximal limb about 2.6 times as long as the distal one and with a bulge on the inner surface....................................................................................... P. wilsoni

- L-shaped pieces with proximal limb being 2.1 times as long as distal limb, and without bulge.................. P. harveyi