Chelantermedia, Brix, 2006
publication ID |
https://doi.org/ 10.24199/j.mmv.2006.63.15 |
DOI |
https://doi.org/10.5281/zenodo.10877582 |
persistent identifier |
https://treatment.plazi.org/id/03EC87DC-2D56-3C10-FCBB-7CB3FE23FCD9 |
treatment provided by |
Felipe |
scientific name |
Chelantermedia |
status |
gen. nov. |
Chelantermedia View in CoL gen. nov.
Type and only species. Chelantermedia composita sp. nov.
Diagnosis. Body elongated, length about 5 times longer than width of pereonite 2. Lateral margins of pereonites straight, Pereonites 6, 7 and pleotelson dorsally fused. Pereopod chelate, enlarged, carpus ventrally with 1 slender seta midway and 1 slender seta proximal to claw-seta.
Etymology. The first part of the name refers to the chela of pereopod I. Chela (Latin, a claw) and intermedia (Latin, in between) reflect the intermediate set of characters between Desmosomatidae and Nannoniscidae – as it occurs for example in the chela of pereopod I.
Discussion. The new genus shows a mixture of characters of Desmosomatidae Sars, 1897 and Nannoniscidae Hansen, 1916 , two families that are poorly differentiated. The new species, C. composita , will be important in phylogenetic studies leading to better understanding of the relationships within the family Desmosomatidae . It possesses a combination of character states not compatible with any existing genus. No desmosomatid genus has pereonites 6 and 7 and the pleotelson fused as in some nannoniscid genera, for example Rapaniscus Siebenhaller and Hessler, 1981 . All nannoniscid genera including species with fused pereonites 6 and 7 ( Hebefustis Siebenhaller and Hessler, 1977 , Rapaniscus , Regabellator Siebenhaller and Hessler, 1981 , Nannoniscoides Hansen, 1916 , Nannoniscus Sars, 1870 , Saetoniscus Brandt, 2002 ) have an antennula with a bulbous distal article. The new genus does not possess such a specialisation, the flagellar articles of the antennula tapering towards the distal article. Pereopod I resembles most species of Prochelator Hessler, 1970 , Chelator Hessler, 1970 or Oecidiobranchus Hessler, 1970 . Prochelator is the only one of these three that includes species with biramous uropods but none has fused pereonites.
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