Cymbasoma

Suárez-Morales, Eduardo & Mckinnon, David, 2016, The Australian Monstrilloida (Crustacea: Copepoda) II. Cymbasoma Thompson, 1888, Zootaxa 4102 (1), pp. 1-129 : 126

Key to the Australian species of Cymbasoma (males)

1A. Caudal ramus with three caudal setae...................................................................... 4

1B. Caudal ramus with four caudal setae...................................................................... 2

2A. Cephalic region with ventral protuberance; anal somite lacking spiniform processes................................. 3

2B. Cephalic region with no ventral protuberances; anal somite with dorsal spiniform processes on posterior margin.............................................................................................. C. jinigudira sp. nov.

3A. Medial insertion of genital lappets flat, smooth; fifth pedigerous somite ventrally corrugated; dorsal surface of cephalic region with rounded protuberance; antennulary element 3 remarkably long............................. C. bitumidum sp. nov.

3B. Medial insertion of genital lappets with conspicuous rounded process; fifth pedigerous somite ventrally smooth; dorsal surface of cephalic region without protuberances; antennulary element 3 not particularly long.............. C. strzeleckii sp. nov.

4A. Cephalic region with ventral protuberance.................................................................. 5

4B. Cephalic region lacking ventral protuberances............................................................. 6

5A. Medial insertion of genital lappets with bifurcate process; anal somite with paired strong ventral protuberances........................................................................................... C. marioeduardoi sp. nov.

5B. Medial insertion of genital lappets flat, ornamented with two spiniform processes; anal somite lacking protuberances............................................................................................ C. colefaxi sp. nov.

6A. Medial insertion of genital lappets with rounded protuberance.................................................. 7

6B. Medial insertion of genital lappets flat, lacking protuberances.................................................. 8

7A. Genital lappets with inner margin ornamented with spiniform teeth; cap-like process absent from frontal surface......... 9

7B. Genital lappets with inner margin smooth, cap-like process on frontal surface of cephalic region............................................................................................................. C. galerus sp. nov.

8A. Genital lappets narrow, digitiform, elongated............................................. C. clairejoanae sp. nov.

8B. Genital lappets robust, relatively short................................................. C. leighrandalli sp. nov.

9A. Cephalic region with pair of strongly protuberant lens-like processes; genital somite with corrugate dorsal surface; genital lap- pets tapering distally................................................................... C. lenticula sp. nov.

9B. Cephalic region without protuberant lens-like processes; genital somite with smooth dorsal surface; genital lappets robust, wide, not tapering distally............................................................................ 10

10A. Genital lappets with few (4) strong acute teeth on proximal inner margin; anal somite with smooth lateral margins, not con- stricted; fifth pedigerous somite with straight lateral margins, lacking rounded posterolateral processes.............................................................................................. C. pseudoquadridens sp. nov.

10B. Genital lappets with 7–10 relatively small acute teeth on proximal inner margin; anal somite constricted; fifth pedigerous somite with rounded posterolateral processes.............................................. C. annulocolle sp. nov.