Wittmann 2023c
Wittmann 2023c
Wittmann, K.J., 2023c. Evidence and Modification of Non-Visual Eyestalk Organs in Troglobiont Mysida and Stygiomysida (Crustacea). arthropoda, 2023, 1 (4): 432-450 + suppl.
https://doi.org/10.1016/B978-0-12-821844-0.00018-1
https://www.mdpi.com/2813-3323/1/4/19
Why do the eyes remain comparatively large whereas the cornea is reduced in most troglobiont mysids? Are there any important organ size-dependent functions served by non-visual eye rudiments? This issue was approached by measuring eye structures in five tro-globiont species of Mysida and two Stygiomysida compared with 14 troglophile and 49 trogloxene Mysida species. The Organ of Bellonci (OB) was found in all Mysida and as first records also in Stygiomysida. The length of OBs increased with individual body length and eye length in four examined species: from postnauplioid larvae to adult stage in a troglophile and a trogloxene mysid species examined; and from juveniles to adults in a troglobiont mysid and a troglobiont stygiomysid. At the interspecific level, eye length was on average 26% shorter at a given body length while the OB was 40% longer at a given body length and 54% longer at a given eye length, respectively, in adult troglobionts compared with trogloxene mysids. The OB is clearly proliferating while the cornea is reduced in troglobionts. This points to sensory functions (possibly together with other functions). The sensory pore organ was found in all 15 Mysida species whose eyes were mounted on slides, and a first record of this organ was also found in Stygiomysida.
troglophilia; ontogeny; morphology; eye structure; size of Organ of Bellonci; sensory pore organ
Mysida, Stygiomysida, Anisomysis bifurcata, Anisomysis gutzui, Anisomysis ijimai, Anisomysis marisrubri, Antromysis cenotensis, Antromysis cubanica, Antromysis peckorum, Bermudamysis speluncola, Diamysis bahirensis, Diamysis camassai, Diamysis fluviatilis, Diamysis frontieri, Diamysis hebraica, Diamysis lacustris, Diamysis lagunaris, Diamysis mesohalobia, Diamysis pengoi, Diamysis pusilla, Gangemysis assimilis, Harmelinella mariannae, Hemimysis maderensis, Hemimysis margalefi, Hemimysis mediterranea, Hemimysis speluncola, Heteromysis bermudensis, Heteromysis cotti, Heteromysis dispar, Heteromysis ekamako, Heteromysis microps, Heteromysis sabelliphila, Idiomysis diadema, Idiomysis tsurnamali, Indomysis nybini, Ischiomysis peterwirtzi, Leptomysis buergii, Leptomysis lingvura marioni, Leptomysis truncata, Limnomysis benedeni, Mysidetes hanseni, Mysidetes illigi, Mysidium cubanense, Mysidium integrum, Mysidium triangulare, Mysidopsis gibbosa, Neomysis integer, Palaumysis simonae, Paramysis sowinskii, Parvimysis bahamensis, Parvimysis brattegardi, Parvimysis fittkaui, Parvimysis laminata, Parvimysis nuda, Parvimysis ornata, Parvimysis pisciscibus, Parvimysis pricei, Platyops sterreri, Praunus flexuosus, Praunus neglectus, Pyroleptomysis peresi, Pyroleptomysis rubra, Schistomysis spiritus, Siriella clausii, Siriella crassipes, Siriella gracilipes, Spelaeomysis bottazzii, Stygiomysis major, Surinamysis robertsonae, Taphromysis bowmani, Taphromysis louisianae, Troglomysis vjetrenicensis