Coelogynopora, Steinbock, 1924

Jouk, Philippe E. H., Revis, Nathalie J. P. & Artois, Tom, 2019, Coelogynopora schockaerti n. sp. (Proseriata: Coelogynoporidae), a remnant of a platyhelminth coldwater fauna in the northwestern Mediterranean?, Zootaxa 4686 (3), pp. 409-418 : 411-415

Main differences between the species of Coelogynopora can be derived from the identification key below:

1. - Solar organ present.................................................................................... 2

- Solar organ absent.................................................................................... 5

2.- Male copulatory organ only armed with six to eight small spines 5–7 µm long.............................. C. visurgis

- Male copulatory organ armed with more or larger spines...................................................... 3

3.- Male copulatory organ armed with six spines 110 µm long............................................... C. solifer

- Male copulatory organ armed with more spines............................................................. 4

4.- Male copulatory organ armed with nine spines 90–135 µm long......................................... C. schulzii

- Male copulatory organ armed with 16–17 spines 70–80 µm long*..................................... C. multispina

5. - Male copulatory organ without hard structures.................................................... C.gynocotyla

- Male copulatory organ with hard structures................................................................. 6

6.- Sclerotic parts of male copulatory organ with central stylet/pipe................................................ 7

- Sclerotic parts of male copulatory organ without central stylet/pipe............................................. 16

7.- Accessory spines present............................................................................... 8

- Accessory spines absent............................................................................... 12

8.- Accessory spines consisting of one pair of strong spines with hooked tips located caudally of the central spines; central spines fused and with tips oriented towards caudal end.................................................... C. birostrata

- Accessory spines consisting of more than one pair of strong needles............................................. 9

9.- Two groups of three accessory spines present lateral to the central spines, consisting of three different pairs of needles; four or five slightly bent hooks with blunt spur forming a half circle over the central bundle and a small cresent-like piece just in front of central spines............................................................................... C. forcipis

- Two groups of more than three accessory spines present...................................................... 10

10.- Five pairs of identical accessory spines rostral to central spines.................................... C. sopottehlersae

- Five or more pairs of accessory spines organized differently.................................................. 11

11.- Two groups of six to eight identical accessory spines rostral to central spines, with tips oriented towards caudal end................................................................................................. C. faenofurca

- Two groups of five to six accessory spines of two different types of needles (four to five pairs of fine needles with bent tips and one to two pairs of stronger spines with hooked tip); two short spines on either side alongside the tip of the central stylet................................................................................................ C. cassida

12.- Median stylet/pipe with one pair of spines attached basally......................................... C. brachystyla

- More than one pair of spines present..................................................................... 13

13.- Median stylet accompanied by two pairs of strong, hook-tipped spines.................................. C. coniuncta

- More than two pairs of spines present.................................................................... 14

14.- Median stylet closely associated with two pairs of longer spines (one pair more solid than the other pair) and a second group of 8 shorter spines................................................................................ C. minuta

- Male copulatory organ consisting of 36 needles of three different types fused basally to form a central pipe......... C. alata

15.- No accessory spines present............................................................................ 16

- Two or more accessory spines present.................................................................... 19

16.- All spines (26–28) of central bundle similar, arranged cylindrically...................................... C. gigantea

- Spines of different types present in central bundle........................................................... 17

17.- Unpaired number of spines in central bundle; 16 (or 18) spines wreath-like arranged around a single central spine..................................................................................................... C. coronata

- Paired number of spines in central bundle................................................................. 18

18- Central bundle composed of 34 spines arranged in a half circle......................................... C. falcaria

- Central bundle composed of 20 spines............................................................ C. frondifera

19.- Two accessory spines present........................................................................... 20

- More than two accessory spines present.................................................................. 36

20.- Central spines joined basally........................................................................... 21

- Central spines not joined basally........................................................................ 26

21.- Central spines joined basally into one group............................................................... 22

- Central spines joined basally into two groups........................................................ C. nodosa

22.- Central bundle of spines pointed caudally............................................................ C. tenuis

- Central bundle of spines pointed rostrally................................................................. 23

23.- Accessory spines located laterally from central bundle...................................................... ..24

- Accessory spines located distally from central bundle........................................................ 25

24.- Central bundle composed of four spines: two fine needles with slightly bent tip centrally and two lateral needles with a hookshaped tip................................................................................... C. sequana

- Central bundle composed of six spines: two straight needles and four needles with bent tip................. C. steinboecki

25.- Central bundle composed of eight or nine spines: two or three central needles with strongly bent tip and six needles with hooked tip and spur.................................................................................. C. hamulis

- Central bundle composed of ten spines: four slender spines, four more robust spines with curved tips and small guard and two short spines associated like forceps............................................................ C. juxtaforcipis

26.- Accessory spines positioned lateral to central bundle........................................................ 27

- Accessory spines positioned caudal to central bundle........................................................ 28

27.- Central bundle composed of four different pairs of spines; accessory spines with bent tips; two very small plates just in front of central spines............................................................................ C. faeroernensis

- Central bundle composed of five pairs of spines with hooked tips, caudal ends tight together; accessory spines simple, without lateral spur............................................................................... C. sewardensis

- Central bundle composed of six pairs of spines of three different types; accessory spines pointed with flared beak-like head........................................................................................ C. poaceaglandis

28.- Accessory spines pointed caudally....................................................................... 29

- Accessory spines pointed rostally....................................................................... 30

29.- Accessory spines straight; Central bundle composed of two closely-placed-together groups of spines............ C. scalpri

- Accessory spines with tip bent at right angle towards the middle................................. C. schockaerti n. sp.

30.- Tip of accessory spine simple, without appendages.......................................................... 31

- Tip of accessory spines more complex.................................................................... 33

31.- Central bundle composed of four pairs of simple needles with slightly bent tips.......................... C. tenuiformis

- Central bundle composed of spines of different types ........................................................ 32

32.- Central bundle composed of 11 spines, one central spine accompanied by one pair of fine needles and four pairs of needles with hooked tips; accessory spines with slightly bent tips................................................... C. gallica

- Central bundle composed of 10–12 spines, six to eight fine, parallel needles, two large cone-shaped spines and two needles positioned diagonally over the cone-shaped spines; accessory spines bent to almost right angles (most of the time)................................................................................................... C. biarmata

33.- Central bundle composed of one pair of central spines, with anteriorly another pair of smaller spines........ C. distortofolio

- Central bundle composed of more spines.................................................................. 34

34.- Accessory spines with strongly bent tip and large appendages on either side, each connected to a muscular bulbus (vesicula granulorum); central bundle composed of five pairs of needles of two different types ............................ C. axi

- Accessory spines more or less straight.................................................................... 35

35.- Accessory spines with triangular appendix; central bundle composed of four pairs of needles of two different types ................................................................................................... C. hymanae

- Accessory spines with strongly bent tip and spur; central bundle composed of six pairs of needles of two different types .............................................................................................. C. hangoensis

36.- Four accessory spines present; central bundle composed of one central pair of large spines, surrounded by a circle of about 30 fine needles................................................................................. C. cochleare

- Two bundles of accessory spines present (12 spines per bundle).......................................... C. erotica