Coryphella gracilis, (ALDER & HANCOCK, 1844)

Ekimova, Irina, Valdés, Ángel, Malaquias, Manuel António E, Rauch, Cessa, Chichvarkhin, Anton, Mikhlina, Anna, Antokhina, Tatiana, Chichvarkhina, Olga & Schepetov, Dimitry, 2022, High-level taxonomic splitting in allopatric taxa causes confusion downstream: a revision of the nudibranch family Сoryphellidae, Zoological Journal of the Linnean Society 196 (1), pp. 215-249 : 230-231

CORYPHELLA GRACILIS (ALDER & HANCOCK, 1844)

( FIGS 8E , 9 , 11A–C , 12A, B )

Diagnosis: Body narrow, notal ridge partly reduced, discontinuous. Rhinophores smooth, white. Cerata in several groups, long, coloration orange to intensive red or reddish-brown. Anal opening pleuroproctic, under first row of second group of cerata. Jaws triangle plates, masticatory process with four to six rows of small conical denticles. Radula triserial, rachidian tooth triangle plate with non-compressed elongated conical

cusp and six to nine denticles on each side forming deep furrows. Lateral teeth triangle, bearing seven to nine small denticles, with attenuated basal process. Vas deferens long, convoluted, thin. Penis narrow, conical.

See Supporting Information, Table S1 for list of examined material.

Figures

Figure 8. Reproductive system of target species. A, Coryphella verrucosa, ZMMU WS14479, Haplogroup A. B, Coryphella verrucosa, ZMMU WS14398, Haplogroup C. C, Borealea nobilis, ZMMU WS14443. D, Coryphella sanamyanae, ZMMU WS14416. E, Coryphella gracilis, ZMMU WS14914. F, Coryphella gracilis, ZMMU WS14418. Abbreviations: amp, ampulla; fgm, female gland mass; dsr, distal receptaculum seminis; psr, proximal receptaculum seminis (= ‘bursa copulatrix’); ps, penial sheath; pvd, prostatic vas deferens. Scale bars: A–D = 1 mm; E, F = 500 µm.

Figure 9. Living specimens of Coryphella gracilis (former Microchlamylla gracilis). A, ZMBN127842, no measurements taken. B, ZMBN125110, c. 15 mm in length. C, ZMBN125576, c. 8 mm in length. D, ZMMU WS14914, 14 mm in length preserved. E, voucher not specified, 11 mm in length. F, ZMMU WS14930, 9 mm in length. G, juvenile, ZMMU WS14929, 4 mm in length preserved. Photo credits: A, C, Heine Jensen; B, Anders Schouw; D, Tatiana Antokhina; E–G, Irina Ekimova.

Figure 11. SEM micrographs of radula in Coryphella gracilis and Coryphella amabilis (former Microchlamylla). A, Coryphella gracilis, ZMMU WS14915, middle radular portion. B, Coryphella gracilis, ZMMU WS14914, middle radular portion. C, Coryphella gracilis, ZMMU WS14922, middle radular portion. D, Coryphella amabilis, ZMMU WS14966, middle radular portion. E, Coryphella amabilis, ZMMU WS14960, middle radular portion.F, Coryphella amabilis, ZMMU WS14418, middle radular portion. G, Coryphella amabilis, ZMMU WS14395, middle radular portion. Scale bars: A–E, G = 30 µm; F = 10 µm.

Figure 12. SEM micrographs of jaws in Coryphella gracilis and Coryphella amabilis (former Microchlamylla). A, Coryphella gracilis, right jaw plate, ZMMU WS14915. B, Coryphella gracilis, details of denticulation on masticatory process, ZMMU WS14915. C, Coryphella amabilis, ZMMU WS14960, left jaw plate. D, Coryphella amabilis, ZMMU WS14960, details of denticulation on masticatory process. E, Coryphella amabilis, ZMMU WS14966, right jaw plate. F, Coryphella amabilis, ZMMU WS14966, details of denticulation on masticatory process. Scale bars: A, C, E = 100 µm, B, F = 30 µm, D = 10 µm.