Cymothoa
Creators: name: Martin, Melissa B.
name: Bruce, Niel L.
name: Nowak, Barbara F.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Cymothoidae
Cymothoa

description: Key to the Australian species of the genus Cymothoa
1. Pereonite 1 anterolateral margins broad, with round or subtruncate projections; extending more than half the length of cepha- lon................................................................................................ 2
- Pereonite 1 anterolateral margins narrow, with minute projections; extending less than half the length of cephalon....... 5
2. Uropod half or shorter than pleotelson length; pereopod 7 ischium without bulbous protrusion on inferior distal margin... 3
- Uropod more than half of pleotelson length; pereopod 7 ischium with bulbous protrusion on inferior distal margin......... 4
3. Pereopod 7 merus with bulbous protrusion on inferior distal margin; pleonites not subequal in width..... Cymothoa eremita
- Pereopod 7 merus without bulbous protrusion on inferior distal margin; pleonites subequal in width..... Cymothoa frontalis
4. Frontal lamina ventrally folded, appearing to envelop paired antennae; pereopod 7 basis more than 1.0 times longer than wide, dactylus broad......................................................................... Cymothoa propria
- Frontal lamina not ventrally folded, not enveloping paired antennae; pereopod basis less than 1.0 times longer than wide, dac- tylus narrow............................................................................. Cymothoa indica
5. Body subparallel or elongate, more than 2.0 times as long as greatest width....................................... 6
- Body ovate or wide, less than 2.0 times as long as greatest width................................................ 9
6. Cephalon subtruncate, pleotelson posterior margin rounded................................................... 7
- Cephalon subtriangular, pleotelson posterior margin subtruncate............................................... 8
7. Pereonite 7 posterolateral margin not extending beyond pleonite 3; uropod exopod longer than endopod, pereopod 7 inferior margin smooth and straight on basis, ischium and merus.................................... Cymothoa bychowskyi
- Pereonite 7 posterolateral margin extending beyond pleonite 3; uropod exopod similar length to endopod, pereopod 7 inferior margin with bulbous protrusion on basis, ischium and merus................................... Cymothoa pulchrum
8. Labrum narrow and small, eyes absent....................................................... Cymothoa carangi
- Labrum fleshy, eyes partially or distinctly visible............................................... Cymothoa vicina
9. Pereonite 1 with bulbous ornamentation; anterolateral margin extending beyond cephalon anterior margin.............. 10
- Pereonite 1 without bulbous ornamentation; anterolateral margin partially reaching or reaching anterior margin of cephalon 11
10. Coxae 5–7 visible from dorsal view, posteroventral margins with acute carina; pleonite 5 wider than pereonite 7................................................................................................ Cymothoa hermani
- Coxae 5–7 not visible from dorsal view, posteroventral margins without acute carina; pleonite 5 wider than pereonite 7............................................................................................ Cymothoa rotunda
11. Pereonite 1 posterolateral margins with minute projections; pereopod 7 basis with acute carina, pleopod 1 exopod and endopod margins smooth....................................................................... Cymothoa epimerica
- Pereonite 1 posterolateral margins without minute projections; pereopod 7 basis without acute carina; pleopod 1 exopod and endopod margins irregular.............................................................. Cymothoa parupenei
description: Published as part of Martin, Melissa B., Bruce, Niel L. & Nowak, Barbara F., 2016, Review of the fish-parasitic genus Cymothoa Fabricius, 1793 (Crustacea: Isopoda: Cymothoidae) from Australia, pp. 1-72 in Zootaxa 4119 (1) on page 6, DOI: 10.11646/zootaxa.4119.1.1, http://zenodo.org/record/258507