Nannoniscus
Creators: name: Kaiser, Stefanie
name: Kihara, Terue Cristina
name: Brix, Saskia
name: Mohrbeck, Inga
name: Janssen, Annika
name: Jennings, Robert M.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Nannoniscidae
Nannoniscus

description: KEY TO PACIFIC SPECIES OF NANNONISCUS (BASED ON FEMALE CHARACTERS ONLY)
1. Uropods uniramous ................................................................................................................................................... 2
– Uropods biramous ...................................................................................................................................................... 3
2. Op posterior margin with ≥ 15 setae .............................................................................................................. N. menoti
– Op posterior margin with ≤ nine setae ............................................................................................................ N. ovatus
3. Op without ventral spine ........................................................................................................................................... 4
– Op with ventral spine 1 ................................................................................................................................................ 6
4. Pereonite 2 coxae strongly produced, pereonite 7 with ventral spine......................................................... N. muscarius
– Pereonite coxae 2 not visible in dorsal view, pereonite 7 without ventral spine ............................................................ 5
5. Body length 3.3 pereonite width, pereonites 5–7 anterolateral tergites with setae .................................. N. detrimentus
– Body length 4.5 pereonite width, pereonites 5–7 anterolateral tergites without setae ................................... N. cristatus
6. Plt posterior margin acute ...................................................................................................................... N. acanthurus
– Plt posterior margin rounded...................................................................................................................................... 7
7. Pereonite 2 anterolateral tergite without setae ............................................................................................ N. magdae
– Pereonite 2 anterolateral tergite with setae ................................................................................................................ 8
8. Urp exopodite well developed, endopodite ≤ 3.2 exopodite length..................................................................... N. pedro
– Urp exopodite minute, endopodite ≥ 5.8 exopodite length ............................................................................................ 9
9. Pereonites 3–4 anterolateral tergites without setae....................................................................................... N. perunis
– Pereonites 3–4 anterolateral tergites with setae ........................................................................................................10
10. p posterior margin with ≤ 9 simple setae........................................................................................................ N. hilario
– Op posterior margin with ≥ 14 simple setae ...............................................................................................................11
11. Molar process of left and right Md with ≥ 12 spines distally ........................................................................ N. menziesi
– Molar process of left and right Md with ≤ five spines each.............................................................................. N. brenkei
1 According to Mezhov (1986), the operculum of N. menziesi has a ventral spine, but it was not observed when examining appendages of the type material.
description: Published as part of Kaiser, Stefanie, Kihara, Terue Cristina, Brix, Saskia, Mohrbeck, Inga, Janssen, Annika & Jennings, Robert M., 2021, Species boundaries and phylogeographic patterns in new species of Nannoniscus (Janiroidea: Nannoniscidae) from the equatorial Pacific nodule province inferred from mtDNA and morphology, pp. 1020-1071 in Zoological Journal of the Linnean Society 193 on page 1064, DOI: 10.1093/zoolinnean/zlaa174, http://zenodo.org/record/5639160