Stygiiulus Vagalinski, Borissov, Bobeva, Canciani & Antić, 2022, stat. nov.
Creators: name: Vagalinski, Boyan
name: Borissov, Simeon
name: Bobeva, Aneliya
name: Canciani, Giacomo
name: Antić, Dragan Ž.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplopoda
Julida
Julidae
Stygiiulus

description: Key to species of Stygiiulus stat. nov. based on gonopodal and external somatic characters
1. Mouthparts modified for a hydrophilous lifestyle ......................................................................... 2
– Mouthparts normal ....................................................................................................................... 4
2. Opisthomere completely devoid of a posterior hump and with an anteriorly arched, apically finely fringed velum; both the anterior and the posterior branch of solenomere vestgial ......................... ............................................................................................ S. ausugi (Manfredi, 1953) comb. nov.
– Opisthomere with a distinct posterior hump and a rather narrow, marginally deeply serrated velum; solenomere with a well-developed, slender posterior branch ......................................................... 3
3. Promere with the apex turned frontad; velum with serrations on both anterior and posterior margins ................................................................................................................................................ ................................................................................ S. fimbriatus (Strasser, 1971) comb. et stat. nov.
– Promere distally somewhat bent caudad; velum with serrations only on anterior margin ................. ................................................................................. S. gentianae (Strasser, 1971) comb. et stat. nov.
4. Opisthomere completely devoid of a posterior hump ....................................................................... 5
– Opisthomere with a posterior hump ................................................................................................. 6
5. Opisthomere with slender, pointed velum, considerably outreaching solenomere; ozopores set at considerable distance behind pro-metazonal suture ............ S. seewaldi (Strasser, 1967) comb. nov.
– Opisthomere with a rather broad velum being subequal to solenomere; ozopores set just next to, or on, pro-metazonal suture ..................................................... S. insularis (Strasser, 1938) comb. nov.
6. Mesomere bent strongly frontad; velum clearly outreaching solenomere; anterior branch of solenomere vestigial, completely fused to velum ................ S. illyricus (Verhoeff, 1929) comb. nov.
– Mesomere more or less straight; velum shorter than, or subequal to, solenomere; anterior branch of solenomere clearly discernible ......................................................................................................... 7
7. Velum bipartite, the larger anterior part with mostly smooth margins, the posterior one serrated or ciliate; solenomere apically with a rather robust anterior branch and one or two finer posterior branches .................................................................................... S. tobias (Berlese, 1886) comb. nov.
– Velum unipartite, marginally deeply serrated; anterior and posterior branch of solenomere of similar proportions ........................................................................................................................................ 8
8. Promere straight, considerably outreaching mesomere; large species (adults 50–70 cm long) ......... ............................................................................................ S. maximus (Verhoeff, 1929) comb. nov.
– Promere bent caudad, slightly shorter than mesomere; smaller species (adults 16–35 mm long) ... 9
9. Distal part of mesomere clavate, with a broad and flat apex .............................................................. ...................................................................................... S. montellensis (Verhoeff, 1930) comb. nov.
– Distal part of mesomere fronto-caudally compressed, with a narrow, rounded apex ......................... ............................................................................... S. rotundatus (Strasser, 1962) comb. et stat. nov.
description: Published as part of Vagalinski, Boyan, Borissov, Simeon, Bobeva, Aneliya, Canciani, Giacomo & Antić, Dragan Ž., 2022, The mostly cavernicolous millipede genus Stygiiulus Verhoeff, 1929, stat. nov.: taxonomy, distribution and phylogenetic relationships (Diplopoda, Julida, Julidae), pp. 30-69 in European Journal of Taxonomy 798 on pages 57-58, DOI: 10.5852/ejt.2022.798.1669, http://zenodo.org/record/6323002