Desmocornea, Wittmann, 2024

Wittmann, Karl J., 2024, The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae, European Journal of Taxonomy 940, pp. 1-180 : 49

Desmocornea gen. nov.

urn:lsid:zoobank.org:act:7A9D3ED7-5555-44F5-93E8-520164BEECE7

Type species

Desmocornea subchelata gen. et sp. nov. by monotypy and present designation.

Diagnosis

Based on adult female. Carapace normal. Bilobate eyes set laterally apart, not connected by membranous integument, no definite eyestalk. Adult eye with incomplete ommatidia (unlike in well-developed eye of juvenile). Lateral third of eyes occupied by lobe containing ommatidia in linear arrangement, together forming self-contained ribbon. Eye with one sensory papilla, no tooth-like non-sensory projection. Antennal peduncle 4-segmented with oblique border between second segment and dorsally overlapping third segment. Antennal scale with small apical segment; mesial margin setose, lateral margin all along bare, scale with large apical tooth; setose apical lobe not reaching tip of this tooth. Mouthparts normal, labrum rostrally rounded. Thoracomeres and pleomeres normal. Thoracic endopod 2 ending in subchela formed by reflexed, strongly elongate dactylus with claw facing carpopropodus. Female with three pairs of well-developed oostegites. Female pleopods reduced to uniramous setose plates with pseudobranchial lobe. Both rami of uropods unsegmented, setose all around. Lateral margins of telson converging laterally, not serrated; no lateral constriction, no terminal incision; lateral margins and transverse terminal margin with spines.

Etymology

The genus name is a noun with feminine ending, formed by fusion of the Classic Greek ‘δεσμός’ (‘ribbon’) with the morphological term ‘cornea’ referring to the cornea of the lateral eye lobe forming a self-contained ribbon ( Fig. 27B ).

Figures

Fig. 27. Eyes in non-adult Desmocornea subchelata gen. et sp. nov., paratypes, immature male with BL of 9.7 mm (A–E: ZMH 64681) and juvenile 5.3 mm (F: ZMH 64680). A–B. Left eye of immature in loco, lateral (A) and dorsal (B) view, prior to dissection. C. Same left eye as above, on slide, ventral view, dashed line enhances contour of self-contained ribbon formed by ommatidia. D–E. Details of panel C, with focus on rhabdom. F. Left eye and rostrum of juvenile, lateral view. Abbreviations: ca = carapace; ll = lateral eye lobe;ml = mesial eye lobe; op = ocular papilla; rh = rhabdom; ro = rostrum.