Ischiomysis peterwirtzi Wittmann, 2013

Wittmann, Karl J. & Wirtz, Peter, 2024, An update on the genus Ischiomysis with a description of I. proincisa sp. nov. (Crustacea, Mysida) from a sublittoral marine cave in the Gulf of Guinea (tropical E-Atlantic), Zoosystematics and Evolution 100 (4), pp. 1431-1442 : 1431-1442

Ischiomysis peterwirtzi Wittmann, 2013

Figs 2 , 3

Ischiomysis peterwirtzi Wittmann, 2013: 497–505, figs 5–6; San Vicente and Monniot 2014: tab. 1; Wittmann et al. 2014: 277, 349; Wittmann and Griffiths 2017: 40; Wittmann and Wirtz 2017: 132, 145, 148; Saito et al. 2018: tab. 2; Wittmann and Chevaldonné 2021: tab. 1, suppl.; Wittmann 2023: tab. S 1; Mees and Meland 2024: AphiaID 723175.

Material.

São Vicente • 6 ♀♀ ad. (BL 4.2–4.8 mm), 3 ♂♂ ad. (BL 4.1–4.4 mm), 2 ♀♀ subad.; E-Atlantic, Cape Verde archipelago, off Mindelo, small island Ilhéu dos Pássaros ; 16.91147 ° N, 25.01181 ° W; 17 m depth; 26 Aug. 2015; P. Wirtz leg.; mysids around the basis of Telmatactis cricoides at foot of large stone • 3 ♂♂ ad. (BL 4.5–4.7 mm), 3 imm., 1 juv.; São Vicente, marine cave Furna da Rosa ; 16.8500 ° N, 25.0833 ° W; 16 m depth; 5 April 2022; P. Wirtz leg.

Note.

Cornea black in freshly caught specimens, eyestalks vary between transparent, opaque, and light red, cephalothorax and tail fan all over deeply red, pleon transparent to light red (ex-situ photo in Fig. 2 ), not considering colors of the content of foregut and intestine, in part visible through the (semi) - transparent body. The present records at the Ilhéu dos Pássaros and the cave Furna da Rosa are the first and second after the first description, respectively. They extend the known distribution by only 11 km to the NE. Swarms associated with T. cricoides (Fig. 3 ) as well as swarms distant from anemones were found in the large cave Furna da Rosa. Additional swarms were observed in five more submarine caves at São Vicente.

Figures

Figure 2. Ex-situ photo of living Ischiomysis peterwirtzi from small island Ilhéu dos Pássaros; photo P. Wirtz.

Figure 3. Ischiomysis peterwirtzi associated with Telmatactis cricoides in the marine cave Furna da Rosa; detail shows a swarm of this mysid species over sand and a small number of specimens over tentacles of the anemone; photo P. Wirtz.