Callichirus Stimpson 1866
Creators: name: Hernáez, Patricio
name: Miranda, Marcel S.
name: Rio, Juliana P. P.
name: Pinheiro, Marcelo A. A.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Callianassidae
Callichirus

description: Key to the species of the genus Callichirus Stimpson, 1866 (Figures 8, 9, 10)
1. Ocular peduncle with obtuse tip, not exceeding or slightly exceeding junction between first and second articles of the antennular peduncle (Figure 8a, d, e) ................................ 2
- Ocular peduncle with prominent distomesial projection distinctly exceeding junction between first and second articles of antennular peduncle (Figure 8b, c, f) ..................... 5
2. Ocular peduncle reaching to about 2/3 of the length of the first article of the antennular peduncle (Figure 8a). Male pleopod 2 with endopod and exopod well developed (Figure 9b) ........................................................................................................................ 3
- Ocular peduncle reaching the limit between the first and second articles of antennular peduncle, or a little beyond (Figure 8d, e). Male pleopod 2 with endopod or exopod reduced (Figure 9d, e) ........................................................................................................ 4
3. Male major cheliped dactylus with bifid tip (Figure 10b). Female major cheliped merus armed with ventral hook (Figure 10c) .................................... C. corruptus sp. nov.
- Male major cheliped dactylus simple (Figure 10a). Female major cheliped merus unarmed .............................................................................. Callichirus sp. (Caribbean Colombia)
4. Male pleopod 2 with endopod underdeveloped (Figure 9e) ............ C. santarosaensis
- Male pleopod 2 with exopod reduced (Figure 9d) ...................................... C. major s. str.
5. Antennular peduncle article 2 reaching as far as antennal peduncle article 4 (Figure 8f). Maxilliped 3 with tiny notch at the flexor distal angle of propodus (Figure 9h) ..... .................................................................................................................................................. C. seilacheri
- Antennular peduncle article 2 exceeding antennal peduncle article 4 (Figure 8b, c). Maxilliped 3 without notch on flexor distal margin of propodus (Figure 9f, g) ......... 6
6. Male major cheliped ischium unarmed ventrally (Figure 10d). Telson with small convexity within median emargination (Figure 10e) .............................................. C. garthi
- Male major cheliped ischium armed with a ventral hook (Figure 10f). Telson without convexity within median emargination (Figure 10h) ............................................................ 7
7. Male pleopod 2 with exopod reduced (Figure 9a). Male major cheliped merus unarmed ventrally (Figure 10g) .................................................................................... C. adamas
- Male pleopod 2 with exopod well developed (Figure 9c). Male major cheliped merus armed with ventral hook (Figure 10f) .................................................................. C. islagrande
description: Published as part of Hernáez, Patricio, Miranda, Marcel S., Rio, Juliana P. P. & Pinheiro, Marcelo A. A., 2022, A new Callichirus ghost shrimp species from the southwestern Atlantic, long confounded with C. major (Say, 1818) (Decapoda: Axiidea: Callichiridae), pp. 533-563 in Journal of Natural History 56 (9 - 12) on page 557, DOI: 10.1080/00222933.2022.2067016, http://zenodo.org/record/7012462